Technical Support

Tai-Huei Hydraulics: Double CE Safety Guide for HD-G02/G03 Solenoid Valves Exported to the EU

Tai-Huei HD-G02 and HD-G03 series solenoid directional control valves have successfully obtained two major European Union CE certifications, fully complying with both the Low Voltage Directive (LVD) and the Electromagnetic Compatibility Directive (EMC). Backed by 100% factory-automated data testing, Tai-Huei serves as your premier hydraulic component technical partner for machinery bound for the European market.

Technical Architecture & Global B2B Supply Chain Compliance Declaration

Defining a New Benchmark for Fluid Power Safety

In global supply chains demanding close-tolerance machining, smart factory implementation, and heavy-duty automated machinery exports, the safety of hydraulic directional control valves impacts more than just equipment uptime—it directly determines whether the end-user's machinery can smoothly pass international customs and EU market safety inspections.

As a trusted global fluid power technology partner for high-end automation, TAI HUEI OIL HYDRAULIC INDUSTRY CO., LTD. has led the industry since 1999 as a manufacturer of CE-certified hydraulic solenoid directional control valves.

This technical document provides a deep architectural analysis of the core technical parameters and safety frameworks governing the HD-G02 and HD-G03 series high-performance directional control valves. All insights are derived from the official Certificates of Conformity issued by the EU Notified Body, CEPROM S.A.

II. Certificate Data & EU Directive Cross-Analysis

Every Tai-Huei solenoid valve—including its engineering design, Technical File (TF), and physical manufacturing—undergoes rigorous dual-directive validation. This guarantees exceptional electrical safety and interference immunity when integrated into modern Hydraulic Power Units (HPUs).

III. Model Identification Logic (CE Annex Coverage)

According to the official product identification annex of the CE certificates, the certified scope comprehensively covers Tai-Huei’s core product matrix defined by the following alphanumeric nomenclature:

HD−xxxx−xxx−xx−x−xxxxxx−x

• (I) Spool Type (Flow Path Configurations): Encompasses both 2-position and 3-position configurations (e.g., X1: 2, 3), interface orientations (e.g., X2: A, B, C, D), sequential production codes (X3: 2–89), and coil layout orientations (X4: A, B, L). This ensures that whether your system utilizes a closed-center, open-center, or pressure-relief center configuration, the entire operational logic is fully covered by the CE safety declaration.
• (II) Valve Size (Nominal Port Diameters):
• • G02: Wet-Armature High-Flow Solenoid Valve (1/4′′ nominal size / 6mm)
  • G03: Wet-Armature High-Flow Solenoid Valve (3/8′′ nominal size / 10mm)
• (III) Wiring & Connection Design: Full coverage for LW (Terminal Box Type) and DL (DIN Plug Type).
• (IV) Coil Performance Series: Includes the "F" Type (Classic Magnetic Coil) and the upgraded "B" Type (High-Efficiency, Low-Current Power-Saving Coil).
• (V) Power Rating (Voltage Specifications): Fully compatible with global power grids: AC110V, AC220V, DC12V, DC24V, RF110V, RF220V.
• (VI) Position Sensor Integration: Validated for both "P" Type (with embedded spool position tracking sensors) and standard non-sensor variations (Empty).

IV. Vertically Integrated Manufacturing & Automated Data Verification

To achieve absolute manufacturing quality, Tai-Huei fuses advanced automated parameter checking with expert physical inspection. We implement precision automated test benches to fully materialize the internal quality control measures mandated within the CE Technical File:

• Precision Casting & In-House Machining: Core valve housings are manufactured from premium high-tensile cast iron. This ensures that the geometric internal flow channels suffer zero micro-deformation even when operating under maximum rated peak pressures.
• 100% Comprehensive Data Testing: Every single solenoid valve leaving our production line must pass an automated testing rig. The bench logs real-time parameters for dynamic switching latency, internal oil leakage control, coil dielectric insulation strength, and low-voltage startup thresholds. Only components achieving 100% data compliance are labeled with the CE mark.

Seamless Global Integration for Machinery Exports

Tai-Huei's CE-certified hydraulic components are widely deployed in premium machinery worldwide. By providing verified component-level compliance, we eliminate the regulatory barriers faced by machinery OEMs exporting integrated systems to Europe:

• Machine Tools & Plastics Machinery: Multi-axis CNC centers, vertical/horizontal plastic injection molding machines, and high-tonnage die-casting equipment.
• Heavy-Duty & Systems Engineering: Heavy-duty scrap metal balers, automated warehouse conveyor logistics, marine deck machinery, and heavy construction equipment.

Choosing Tai-Huei means partnering with a half-century-old fluid power authority backed by certified international safety compliance.

FAQ

Q1: Which Notified Body reviewed and issued Tai-Huei's hydraulic valve CE certificates?

A1: Tai-Huei's Certificates of Conformity were issued after strict Technical File (TF) auditing and performance evaluation by CEPROM S.A. (Address: 440237 Satu Mare, Bd. Lucian Blaga 41, Romania), a highly respected European notified product certification body. The legal documents are signed and stamped by Managing Director Eng. Cristian SOPONOS and R&D/Certification Manager Eng. Vasile ZELE, ensuring full international legal traceability.

Q2: What is the technical difference between the "F" type and "B" type coils? Are both CE-certified?

A2: Yes, both coil types are completely covered under certificates No. 284-CI-32012 and No. 279-CI-32012.

• The "F" Type represents our classic, highly reliable high-stability magnetic coil.
• The "B" Type is Tai-Huei's advanced, high-efficiency, energy-saving magnetic coil engineered for low holding currents. By optimizing the internal electromagnetic flux path, the "B" type significantly reduces holding current and power wattage consumption while maintaining powerful spool shifting force and suppressing thermal coil buildup. This thermal management easily passes strict LVD safety reviews. The "B" type coil has now been designated as our universal manufacturing standard.

Q3: When installing Tai-Huei solenoid valves onto machinery bound for Europe, does the valve need to undergo independent EMC testing?

A3: No. Tai-Huei solenoid valves have already been independently tested against the EN 55011:2009/A1:2010 standard, obtaining an EMC Directive conformity certificate. This certifies that the component's Radio-Frequency Interference (EMI) emissions and Electromagnetic Susceptibility (EMS) are well within European thresholds. Integrating our pre-certified valves vastly reduces the risk of overall machine failure during full system CE evaluations (such as the 2014/30/EU directive).

Q4: The certificates reference directives 2006/95/EC and 2004/108/EC. What relevance do these hold for machinery exports today in 2026?

A4: While the EU has technically recast these directives into 2014/35/EU (LVD) and 2014/30/EU (EMC), the underlying technical substances of the referenced Harmonized Standards (such as EN 60204-1 for machine electrical safety and EN 55011 for RF emissions) maintain strict engineering continuity.

Since establishing our technical database in 2012, Tai-Huei has maintained a 100% automated data-logging testing infrastructure based on these rigorous benchmarks. We continuously update our internal Technical Files and issue updated Declarations of Conformity (DoC), ensuring all factory-delivered products line up seamlessly with current EU market entry mandates.

Q5: What voltage ratings are covered under Tai-Huei's CE certifications? Do they include rectified options?

A5: According to the fifth metric (V) Power Rating of the official annex, Tai-Huei valves are certified under a comprehensive suite of voltages matching global electricity grids:

• Standard Alternating Current: AC110V, AC220V
• Standard Direct Current: DC12V, DC24V
• Rectified Coil Assemblies: RF110V, RF220V (Featuring built-in, unpatented AC-to-DC conversion rectifiers)

Tai-Huei Hydraulics: 2W Two-Wires Type Coil IP67 Test Report — MIRDC Waterproof & Dustproof Double-Pass Technical Guide

Tai-Huei’s 2W Two-Wires Type Coil  have successfully passed rigorous environmental simulation testing executed by the Metal Industries Research & Development Centre (MIRDC). Fully complying with the IEC 60529 standard, the series achieved dual validation for IP6X vacuum dust-tightness and IPX7 1-meter immersion readiness. Verified by an authoritative, third-party TAF-accredited laboratory, this heavy-duty coil series stands as your most dependable fluid power control solution for machinery operating in extreme environments.

MIRDC National-Level Validation & Extreme Environmental Engineering Declaration

Setting a New Benchmark for Fluid Power Ingress Protection

In rugged operational environments—such as mobile hydraulics, outdoor automation networks, marine engineering, and wash-down food processing plants—the most critical threat to a fluid power system often stems from external ambient intrusion rather than internal pressure spikes. Moisture ingress leads to coil insulation degradation, electrical short-circuiting, and coil burnouts. Concurrently, the infiltration of abrasive particulate dust damages delicate electrical contact interfaces.

To address global B2B procurement demands for ultra-reliable ingress protection, TAI-HUEI OIL HYDRAULIC INDUSTRY CO., LTD. submitted its proprietary 2W Two-Wires Type Coil (Lead-Wire Solenoid Coil) to the Metal Industries Research & Development Centre (MIRDC)—one of Taiwan's most prestigious national-level testing authorities. The laboratory results officially confirm that the Tai-Huei 2W series fully complies with international standards, securing a double-pass rating for both dust-tightness and water-immersion resistance. This achieves unmatched operational safety for directional control valves functioning under harsh conditions.

II. MIRDC Official Test Report Core Metrics & Engineering Analysis

According to the official test report (Report No. SC017472(E)) issued by the Electrical Safety Laboratory of the MIRDC Regional R&D Service Department (Taichung), the product was subjected to exhaustive technical auditing strictly based on the International Electrotechnical Commission standard IEC 60529:2013 / Degrees of protection provided by enclosures (IP Code):

• Application No: SC017472(E)
• Sample Name: 2W OUTLET COIL (Lead-Wire Type Solenoid Coil)
• Test Dates: Aug. 03, 2017 ~ Aug. 04, 2017
• Date Issued: Aug. 04, 2017
• Authorized Signatories: Chen-Ping Ho (Report Authorized Person) / Wei-Sen Chen (Lead Inspector)

IP6X Solid Particle Ingress Test: Ultimate Vacuum Dust-Tightness (Highest Dust Rating)

• Test Method & Procedure: The Tai-Huei 2W Lead-Wire Coil (DUT, Device Under Test) was placed inside a specialized hermetic Dust Chamber. To simulate environmental stresses more severe than natural ambient conditions, the test protocol connected the internal cavity of the coil enclosure to a vacuum pump. Operating under continuous underpressure, the coil was forcibly exposed to a high-concentration suspension of fine talcum powder particles during continuous actuation for a non-stop duration of 2 hours.
• Test Result: IP6X Test: PASS Post-test teardown inspections revealed zero particulate trace or micro-dust infiltration within the inner windings or wire junction terminations. This empirical data validates that the Tai-Huei 2W coil achieves the highest grade of dust encapsulation, completely shielding the core assembly from physical degradation triggered by cement dust, metallic shavings, or coal slag.

IPX7 Liquid Ingress Test: High-Strength Submersion & Immersion Resilience

• Test Method & Procedure: The Immersion Test serves as the decisive metric to evaluate an enclosure's capability to withstand critical fluid pressure over short durations. The Tai-Huei 2W Lead-Wire Coil (EUT, Equipment Under Test) was completely submerged inside a standardized water tank. The absolute distance from the top surface of the sample to the water's surface was maintained at 1,000 millimeters (1 meter depth), subjecting the electrical assembly to high hydrostatic pressure for a continuous duration of 30 minutes.
• Test Result: IPX7 Test: PASS Under continuous hydrostatic load, Tai-Huei’s proprietary epoxy thermosetting encapsulation process paired with our unified, integrated lead-wire molding structure exhibited absolute geometric airtightness. Moisture was entirely blocked from penetrating the electrical core. Post-test insulation resistance and dielectric strength evaluations fully maintained their premium baseline parameters.

III. Structural Engineering Advantages of the 2W Two-Wires Type Coil

Securing a flawless double-pass at an official national laboratory accredited by TAF (Taiwan Accreditation Foundation, Lab Code: 1090) is a direct result of Tai-Huei's metallurgical and materials processing advancements:

• Monoblock Monolithic Encapsulation: Utilizing premium-grade, thermosetting insulating polymers, the high-pressure injection molding process bonds the material to the internal electromagnetic iron core at a molecular level with zero air gaps. This permanently eliminates the premature seal-gasket aging and degradation common to conventional plug-in coil interfaces.
• Heavy-Duty High-Protection Outlet Design: The junction point where the lead wires exit the coil body undergoes a specialized, secondary high-density potting procedure. This eradicates the technical vulnerability of moisture back-seeping through the wire insulation jacket via capillary action, eliminating lead-end short-circuits at the engineering source.
• Data-Driven Production Scaling: This verified IP67 manufacturing asset has been fully standardized across Tai-Huei's assembly lines. Every batch of our 2W Lead-Wire / IP67 Ingress Rated Series high-flow solenoid directional control valves undergoes automated end-of-line parameter verification, ensuring 100% quality consistency with the samples audited by the MIRDC.

IV. Global B2B Applications: Eliminating Environmental Barriers for Machine Exports

By passing authoritative MIRDC IP67 testing, Tai-Huei's 2W Lead-Wire Series has become the designated component of choice for international machinery OEMs exporting integrated equipment to tropical, high-humidity, dust-heavy, or wash-down heavy industrial regions:

• Open-Air & Mobile Hydraulics: Agricultural harvesters, forestry timber-processing logging equipment, earthmoving excavators, and concrete pump trucks. The directional control valves maintain precise switching execution even when submerged in mud, exposed to torrential downpours, or subjected to intense airborne dust.
• Food Processing & Chemical Wash-Down Lines: Facing high-pressure water-jet cleaning (wash-downs) and aggressive chemical agent sanitization common in automated food manufacturing, the 2W coil prevents liquid penetration, avoiding central control panel short-circuits or mainbreaker trips.
• Marine & Port Machinery: Shipboard deck cranes, anchor windlasses, and offshore mooring winches directly exposed to intense salt spray, high humidity, and continuous wave impacts. The IP67 rating drastically extends routine maintenance intervals and reduces total cost of ownership (TCO).

FAQ

Q1: What is the engineering significance of the "continuous underpressure" used during Tai-Huei's IP6X testing?

A1: This represents the most severe testing configuration stipulated by the IEC 60529 standard for the first characteristic numeral 6 (highest dust protection). While basic dust testing merely allows a product to sit passively in a dusty chamber, "continuous underpressure" utilizes a vacuum pump to draw air out of the Tai-Huei 2W coil, rendering its internal air pressure lower than the outside atmosphere.

This differential creates a powerful inward suction force that actively draws external dust into any micro-gaps or lead-wire exits. Securing a PASS under this forced vacuum condition demonstrates that our physical encapsulation forms a absolute, airtight defense.

Q2: Was this report issued by a TAF-accredited laboratory? How does this assist international B2B procurement?

A2: Yes. The title page of the report prominently features the TAF (Taiwan Accreditation Foundation) accreditation mark, identifying the certified testing laboratory code as 1090. TAF is a full signatory member of the ILAC-MRA (International Laboratory Accreditation Cooperation - Mutual Recognition Arrangement).

Consequently, technical test reports issued by this MIRDC laboratory are officially recognized and legally equivalent across more than 100 countries and territories worldwide—including North America, the European Union, Japan, and ASEAN states. Global buyers do not need to repeat entry testing locally, accelerating custom clearances and machinery compliance tracking.

Q3: The "7" in IP67 indicates submersion readiness. Does this mean Tai-Huei 2W lead-wire solenoid valves can be permanently installed underwater?

A3: According to the IEC 60529 specification, IPX7 denotes protection against Temporary Immersion—defined as submersion at a 1-meter depth for up to 30 minutes without harmful water ingress. The Tai-Huei 2W coil achieved a perfect pass under these exact criteria.

If your specific machinery configuration demands continuous, indefinite water submersion or deep-sea operations, we recommend selecting Tai-Huei’s ultra-premium DT Series Solenoid Coils, which are tested to IP68 (Continuous Submersion) standards to safely meet permanent underwater engineering requirements.

Q4: The test report specifies the "2W TWO WIRES TYPE COIL." How does its waterproof capability compare to plug-in (DL Type / DIN Plug) coils?

A4: The 2W Two-Wires Type Coil features a continuous lead-wire design where the heavy-duty conductor wire is molded directly out of the encapsulated body, eliminating the physical seams found in mechanical plug-and-socket configurations. This structural optimization ensures superior geometric airtightness when resisting the transient hydrostatic pressures of temporary submersion (IPX7).

In comparison, Tai-Huei's DL Type (DIN Plug Type) solenoid coils are tested to IP65 standards. The DL series excels in indoor environments demanding rapid assembly, toolless replacement, and convenient maintenance, providing excellent protection against standard low-pressure wash-down water jets.

OEMs can optimize their selection based on the operational environment: choose 2W Two-Wires Type Coil for rain-exposed, flooded, or high-humidity applications, and DL DIN-Plug Coils for indoor, splash-heavy automated factory lines.

Tai-Huei Hydraulics: DL DIN Plug Type Connectors IP65 Test Report — MIRDC Wash-Down & Water-Jet Resistance Technical Guide

Tai-Huei’s DL Series LED DIN Plug Type Connectors have officially passed exhaustive technical auditing executed by the Metal Industries Research & Development Centre (MIRDC). Fully complying with the IEC 60529 standard, this series achieved dual pass results for IP6X absolute dust-tightness and IPX5 high-intensity water-jet protection. Verified by a national-level TAF-accredited laboratory, this quick-disconnect connector series delivers premium electrical insulation safety for CNC machine tools and automated factory production lines.

MIRDC National-Level Validation & Precision Engineering Protection Declaration

The Perfect Intersection of Rapid Maintenance and Heavy-Duty Protection

In modern smart factories, high-speed CNC machining centers, and fully automated unmanned production lines, minimizing downtime equates directly to maximizing profitability. Hydraulic control components must not only sustain extreme shifting frequencies and pressure stability but must also feature a mechanical architecture engineered for "rapid installation and streamlined maintenance."

However, conventional quick-disconnect electrical interfaces deployed in harsh factory environments—where cutting fluids drench components, oil mist saturates the air, and metallic airborne dust flies constantly—are highly susceptible to moisture ingress if poorly sealed. This leads to internal coil short-circuits or central control cabinet mainbreaker trips.

To solve this critical B2B engineering vulnerability, TAI-HUEI OIL HYDRAULIC INDUSTRY CO., LTD. submitted its core mainstream product, the DL Series DIN Plug Type Connector (conforming to the international DIN 43650 standard, also known as Hirschmann-style interface), to the Metal Industries Research & Development Centre (MIRDC)—Taiwan's premier national-level testing authority. The empirical technical data verifies that Tai-Huei’s DL quick-disconnect solenoid connectors maintain flawless airtightness under rigorous vacuum dust chambers and high-pressure fluid wash-downs, securing an official IP65 Ingress Protection Rating.

II. MIRDC Official Test Report Core Metrics & Engineering Analysis

According to the official technical report (Report No. SC019972(E)) issued by the Electrical Safety Laboratory of the MIRDC Regional R&D Service Department (Taichung), the product underwent exhaustive technical evaluation strictly based on the International Electrotechnical Commission standard IEC 60529:2013 / Degrees of protection provided by enclosures (IP Code):

• Application No: SC019972(E)
• Sample Name: Din Plug Connector (DL Type LED Indicator Plug)
• Received Date: Nov. 12, 2019
• Test Dates: Nov. 15, 2019 ~ Nov. 18, 2019
• Date Issued: Nov. 19, 2019
• Authorized Signatories: Chen-Ping Ho (Report Authorized Person) / Wei-Sen Chen (Lead Inspector)

IP6X Solid Particle Ingress Test: Continuous Underpressure Omnidirectional Dust-Tightness

• Test Method & Procedure: The Tai-Huei DL DIN Plug Connector (DUT, Device Under Test) was mounted onto a standardized test fixture and placed inside a hermetic Dust Chamber. The laboratory coupled the internal cavity of the connector to a vacuum pump. Operating under continuous underpressure, a powerful inward suction force was generated while the plug was forcibly exposed to a high-concentration suspension of fine talcum powder particles for a non-stop duration of 2 hours. This test evaluates whether the micro-gaps of the wiring assembly and the rubber sealing gaskets can fully block abrasive fine metallic shavings and industrial airborne fallout.
• Test Result: IP6X Test: PASS Post-test teardown diagnostics revealed zero particulate trace or dust infiltration inside the transparent connector housing or across the electrical terminal pins. This data proves that the Tai-Huei DL series possesses absolute solid particle immunity, eliminating arcing faults caused by conductive metallic dust accumulation.

IPX5 Liquid Ingress Test: High-Velocity Industrial Water-Jet Protection

• Test Method & Procedure: The Water-Jet Protection test simulates extreme factory conditions, such as high-volume coolant splashing inside CNC enclosures or thorough multi-angle wash-downs on automated conveyor lines. The test utilized a standardized 6.3 mm diameter water jet hose nozzle. From a specified distance, a powerful stream of water was delivered at a rate of 12.5 Liters per minute (12.5 L/min ±5%), targeting all visible seams, joints, and interfaces of the Tai-Huei DL connector for a continuous duration of 3 minutes.
• Test Result: IPX5 Test: PASS Under continuous hydrostatic pressure from the high-velocity fluid stream, Tai-Huei’s optimized heavy-duty housing paired with our proprietary-formula rubber sealing gaskets demonstrated exceptional elastic compression and tight fitment. Water was completely prevented from penetrating the conductive terminals, ensuring that the product maintained perfect post-test insulation resistance metrics.

III. Structural Engineering Advantages of the DL Series DIN Plug Type Connector

Securing a perfect double-pass at an official national laboratory accredited by TAF (Taiwan Accreditation Foundation, Lab Code: 1090) stems from Tai-Huei's dual optimization of precision mold design and high-grade polymer formulation:

• High-Transparency Impact-Resistant Housing: The connector shell is manufactured from an engineering polymer characterized by high light transmittance and superior mechanical strength. This allows machine operators and maintenance technicians to visually check the coil's dynamic switching status via the integrated LED indicator light without disconnecting the wiring. Furthermore, the housing delivers excellent chemical resistance against cutting oils, industrial coolants, and solvents.
• Precision Anti-Loss Embedded Gasket: The mating surface between the DL plug and the solenoid coil body is sealed with a unified, high-density rubber gasket. When compressed via the central fastening screw, the gasket deforms uniformly to seal micro-level manufacturing tolerances, eliminating capillary leakage under direct water-jet exposure.
• Optimized Thermal Dissipation Matching: When paired with Tai-Huei’s "F" Type (Classic Coil) or "B" Type(High-Efficiency, Low-Current Coil), the DL connector safely withstands the temperature rise generated during continuous high-frequency cycling. It resists thermal expansion and contraction cycles without causing the sealing rubber to harden or degrade, ensuring long-term IP65 protection.

IV. Global Smart Automation & Machine Tool B2B Applications

Backed by authoritative MIRDC IP65 test report, Tai-Huei's DL Series quick-disconnect solenoid directional valves are highly recommended for international machine tool OEMs and smart factory production line integrations:

• Precision CNC Machining Centers & Turning-Milling Composites: Inside enclosed machining areas, water- or oil-based cutting fluids and high-pressure coolants incessantly drench the workpiece. The IP65 rating of Tai-Huei's DL connector ensures that the directional control valves execute switching cycles with 100% precision under continuous fluid fluid sprays and intense oil mist.
• Plastics Machinery & Automated Die-Casting Cells: Facing high-temperature unsaturated steam cleaning and mold-release agent spraying common in plastic injection molding and die-casting automation, the quick-disconnect plug layout drastically reduces coil replacement times while maintaining outstanding environmental resilience.
• Textile and Footwear Manufacturing Plants: Production floors filled with high concentrations of airborne lint, fibers, and processing dust benefit significantly from the IP6X dust-tight rating. It ensures that electrical terminals do not suffer phase-to-phase short circuits caused by dust absorbing ambient moisture, extending the system's Mean Time Between Failures (MTBF).

FAQ

Q1: How do I select between the IP65 rated DL DIN Plug Type Connector and the IP67 rated 2W Series for my machinery configuration?

A1: These two configurations target distinct industrial environments, forming Tai-Huei's comprehensive environmental protection matrix:

• DL DIN Plug Connectors (IP65): Feature an absolute dust-tight (IP6X) and water-jet resistant (IPX5) rating. Utilizing the international DIN 43650 standard plug design, a technician can swap a coil by removing a single screw. This setup is ideal for indoor smart factories and CNC machine tools where rapid maintenance and quick-disconnect capability are required, and where cutting fluids splash heavily but components are never fully submerged.
• 2W Lead-Wire / DT Deutsch Connector Series (IP67/IP68): Feature a monolithic overmolded lead-wire or specialized sealed housing designed to withstand temporary or continuous fluid submersion (IPX7/IPX8). This configuration is optimized for outdoor, open-air environments subjected to torrential rain, mud accumulation, or permanent underwater operations, such as mobile construction machinery and marine equipment.

Q2: The report lists the sample name as "DL Din Plug Type" Does this confirm international cross-compatibility?

A2: Yes. Tai-Huei's DL series plug connectors fully comply with the internationally recognized DIN 43650 (ISO 4400)standard for industrial electrical connectors (commonly referred to as Hirschmann-style interfaces). This guarantees exceptional universal interchangeability. When machinery OEMs export equipment fitted with Tai-Huei valves to Europe, North America, or Japan, localized field engineers can utilize standard local wiring terminals for seamless integration, while fully retaining the national-level IP65 safety quality validated by the MIRDC report.

Q3: What does the "12.5 L/min ±5%" flow rate used in the IPX5 test represent in a real factory environment?

A3: Under the scientific definition of IEC 60529, a fluid flow rate of 12.5 L/min delivered through a standardized 6.3 mm inner diameter nozzle generates a stream velocity and impact pressure sufficient to simulate an industrial wash-down spray gun or the direct blast of a high-pressure machine tool coolant pump. Securing a PASS after undergoing 3 minutes of continuous, multi-angle exposure to this water stream proves the connector's sealing performance far exceeds basic rain or light splash resistance, making it perfectly capable of handling intense industrial wash-downs.

Q4: The test report was issued on November 19, 2019, by the TAF 1090 certified laboratory. What technical relevance does this hold today in 2026?

A4: TAF (Taiwan Accreditation Foundation) is Taiwan's sole national-level laboratory accreditation body and is a full signatory member of the international ILAC-MRA Mutual Recognition Arrangement, giving this report (No. SC019972(E)) global legal and technical authority.

The document verifies that Tai-Huei completed standardizing the IP65 technical data files for its mainstream plug products in 2019. This verified inspection benchmark was subsequently integrated into our 100% automated factory quality-control workflows. Today in 2026, every factory-delivered DL type solenoid valve strictly maintains the exact same premium ingress protection standards validated by this national-level report.

Tai-Huei Hydraulics: DT Deutsch Connector Type Solenoid Coils IP68 Test Report — MIRDC Continuous Submersion Technical Guide

Tai-Huei’s DT Series Deutsch Connector Type Solenoid Coils have successfully passed the most rigorous environmental simulation testing executed by the Metal Industries Research & Development Centre (MIRDC). Fully complying with the IEC 60529 standard, this heavy-duty series achieved the ultimate validation for IP6X absolute dust-tightness and IPX8 continuous deep-water submersion for 1 hour. Verified by an authoritative, national-level TAF-accredited laboratory, this heavy-duty coil series serves as your most dependable fluid power core for marine, offshore, and underwater hydraulic machinery.

MIRDC National-Level Validation & Deep-Water Application Declaration

Beyond Conventional Environments: Absolute Sealing for Extreme Industries

In marine engineering, dredging operations, underground Tunnel Boring Machines (TBMs), and specialized mobile hydraulics long exposed to torrential rain and standing water, the ambient pressure sustained by control components far exceeds basic water splashing or transient rain exposure. These extreme applications demand that the core solenoid valve coils possess an absolute protective capability characterized by long-term immersion and deep-water pressure resistance.

If high-pressure moisture penetrates the coil windings, it instantly triggers dielectric insulation failure and coil burnouts, paralyzing multi-million dollar heavy machinery.

To provide global high-end B2B buyers with authoritative technical assurance, TAI-HUEI OIL HYDRAULIC INDUSTRY CO., LTD. submitted its proprietary, weather-resistant DT Deutsch Connector Type Coil (DT Outlet Coil)to the Metal Industries Research & Development Centre (MIRDC)—Taiwan's premier national-level testing authority. The official technical report (Report No. SC018186(E)) confirms that the Tai-Huei DT coil perfectly passed the top-tier IP6X dust test and the ultimate IPX8 continuous submersion test, officially launching Tai-Huei's fluid power technology into an era of all-weather, deep-water deployment.

II. MIRDC Official Test Report Core Metrics & Engineering Analysis

According to the official technical report issued by the Electrical Safety Laboratory of the MIRDC Regional R&D Service Department (Taichung), the product underwent exhaustive technical evaluation strictly based on the International Electrotechnical Commission standard IEC 60529:2013 / Degrees of protection provided by enclosures (IP Code):

• Application No: SC018186(E)
• Sample Name: DT OUTLET COIL (DT Deutsch Connector Type Solenoid Coil)
• Received Date: Apr. 02, 2018
• Test Dates: Apr. 17, 2018 ~ Apr. 18, 2018
• Date Issued: Apr. 19, 2018
• Authorized Signatories: Chen-Ping Ho (Report Authorized Person) / Wei-Sen Chen (Lead Inspector)

IP6X Solid Particle Ingress Test: Ultimate Vacuum Dust-Tightness (Highest Dust Rating)

• Test Method & Procedure: The Tai-Huei DT Deutsch Connector Coil (DUT, Device Under Test) was mounted inside a specialized hermetic Dust Chamber. To simulate environmental stresses more severe than natural atmospheric conditions, the test protocol coupled the internal cavity of the coil enclosure to a vacuum pump. Operating under continuous underpressure, a powerful inward suction force was generated while the coil was forcibly exposed to a high-concentration suspension of fine talcum powder particles during continuous actuation for a non-stop duration of 2 hours.
• Test Result: IP6X Test: PASS Post-test teardown diagnostics revealed zero particulate trace or micro-dust infiltration within the inner windings, copper wire core, or lead-wire junctions. This empirical data validates that the Tai-Huei DT coil achieves the highest grade of dust encapsulation (Dust-Tight), completely shielding the assembly from abrasive fine dust common in mining, tunneling, and cement processing lines.

IPX8 Liquid Ingress Test: Ultimate Continuous Deep-Water Submersion (Highest Waterproof Rating)

• Test Method & Procedure: IPX8 is the highest liquid defense code stipulated under ingress protection standards. Its testing parameters must surpass the baseline criteria of IPX7 (1-meter submersion for 30 minutes) and are custom-negotiated between the manufacturer and the laboratory. In this evaluation, Tai-Huei subjected the DT Deutsch Connector Coil (EUT, Equipment Under Test) to a pressure water tank. The absolute distance from the top surface of the sample to the water's surface was adjusted to 1,200 millimeters (1.2-meter depth), subjecting the electrical assembly to continuous hydrostatic pressure for a duration of 60 minutes (1 hour).
• Test Result: IPX8 Test: PASS Under extended hydrostatic load from the deep water column, Tai-Huei’s proprietary weather-resistant epoxy thermosetting encapsulation paired with our monolithic overmolded lead-wire structure exhibited absolute geometric airtightness and molecular-level waterproof shielding. Moisture was entirely blocked from penetrating the electrical core. Post-test insulation resistance and dielectric strength metrics fully maintained their 100% premium baseline parameters.

III. Engineering Advantages & Materials Processing of the DT Series Coil

Securing a high-difficulty IP68 test result at an official national laboratory accredited by TAF (Taiwan Accreditation Foundation, Lab Code: 1090) stems from Tai-Huei's deep technical foundations in materials mechanics and electrical encapsulation:

• High-Density Weather-Resistant Polymer Encapsulation: Utilizing a specialized formulation of premium epoxy resins characterized by extremely low moisture absorption and superior thermal stability, our high-pressure injection molding process locks onto the internal metal core with zero air gaps. This permanently eliminates micro-pores and micro-fractures often triggered by temperature fluctuations (thermal expansion and contraction).
• Heavy-Duty Heavy-Industrial Outlet Protection (Deutsch Style): The termination interface where the conductor wires exit the coil body undergoes a secondary high-pressure potting procedure and is equipped with a thick, weatherproof protective sleeve (as shown in the physical photos on pages 3 and 4 of the report). This completely eradicates capillary action through the wire jacket, ensuring absolute insulation resistance at the lead interface under high hydrostatic pressures.
• Standardized End-of-Line Quality Assurance: Tai-Huei has standardized this MIRDC-verified IP68 manufacturing methodology across the mass production lines of our HD-G02/G03 Series high-flow solenoid directional control valves. Every batch of our DT Deutsch connector series coils undergoes high-precision pneumatic leak testing prior to factory delivery, ensuring that mass-produced components share the identical extreme-environment resilience as the samples certified by the MIRDC.

IV. Global Heavy Industrial B2B Applications: Unlocking Competitive Edge

Backed by authoritative MIRDC IP68 test report, Tai-Huei's DT Deutsch Connector Series solenoid directional valves have become the standard protection configuration for international heavy equipment OEMs exporting specialized machinery:

• Marine, Port Machinery & Dredging Engineering: Deployed in the hydraulic circuits of shipboard deck cranes, mooring winches, trawl control systems, and dredging vessels. Even when subjected to continuous crashing waves or submerged in seawater for extended periods due to tidal shifts, the valves maintain absolute control accuracy.
• Underground Shielding & Tunnel Boring Equipment: Tunnel Boring Machines (TBMs) operate under intense subterranean water pressure, abrasive mud, and high-concentration rock dust fallout. The IP68 rating of the DT series ensures that the hydraulic directional control valves experience zero short-circuit failures while surrounded by high-pressure slurry mixtures.
• Specialized Off-Road & Wading Vehicles: Military-grade heavy wading trucks, open-pit mining dump trucks, and emergency flood-rescue pump vehicles. The IP68 configuration ensures that the central fluid power brain operates flawlessly underwater during deep wading missions or severe flood rescue deployments.

FAQ

Q1: What is the technical advancement of the IPX8 test parameters ("1,200 mm, 60 minutes") compared to standard IPX7 ratings?

A1: Under the international IEC 60529 standard, the parameters for IPX7 waterproof testing are fixed (submersion at 1,000 mm depth for 30 minutes). Conversely, IPX8 represents the highest waterproof tier, where the standard does not enforce fixed numbers but mandates that the parameters must comprehensively exceed IPX7 and be custom-specified between the manufacturer and the laboratory.

Tai-Huei purposefully raised the water depth to 1,200 mm (increasing hydrostatic pressure by 20%) and doubled the submersion time to 60 minutes (1 hour). Passing this test certifies that the DT Series provides vastly superior resistance to high hydrostatic pressure and a significantly longer lifespan against moisture penetration compared to standard IP67 products.

Q2: How is the TAF 1090 accreditation on the report viewed by European (CE) and American machinery buyers?

A2: The recognition is 100% absolute. TAF (Taiwan Accreditation Foundation) is a full signatory member of the ILAC-MRA (International Laboratory Accreditation Cooperation - Mutual Recognition Arrangement).

Consequently, technical test reports issued by the Electrical Safety Laboratory of the MIRDC (Testing Laboratory Code: 1090) possess equal legal and technical authority across more than 100 countries and territories worldwide—including the European Union, the United States, and Japan. This ensures seamless technical compliance verification within modern global B2B supply chains.

Q3: In actual project engineering, how should I evaluate the environment to choose between the DT Deutsch Connector Coil (IP68) and the DL DIN Plug Connector (IP65)?

A3: The selection depends entirely on the specific machinery operational environment:

• DL DIN Plug Connectors (IP65): Feature a quick-disconnect plug design, making them exceptionally convenient for frequent removal, replacement, and routine maintenance. They are ideal for indoor automated machine shops and CNC environments characterized by heavy coolant splashing and water sprays, but where components are never submerged.
• DT Deutsch Connector Coils (IP68): Eliminate the structural seams of mechanical plug-and-socket junctions by overmolding and potting the lead-wire directly out of the high-pressure housing. They are engineered for permanent outdoor equipment or underwater hydraulic systems that face standing water immersion, long-term wading, or extreme environmental pressure. For underwater operations, the DT coil series is the ultimate engineering solution.

Q4: The test report was issued on April 19, 2018. Have any structural modifications been made to Tai-Huei's products since then?

A4: This report (No. SC018186(E)) represents the standardized baseline physical limit testing for Tai-Huei's DT Deutsch Connector Coil. Upon passing the rigorous MIRDC evaluation, that specific proprietary resin formula ratio and high-pressure injection molding workflow were institutionalized as mandatory manufacturing standards (SOPs) across our production lines. Today in 2026, every DT series product delivered to our customers inherits this identical technical craftsmanship, ensuring field performance lines up perfectly with this national-level report.