Questions & Answers

Our products are individually tailored to your requirements – therefore, you will receive pricing directly from our WEH® team or from our sales partners in your country.

An overview of all international contacts can be found here: To WEH Worldwide.

That depends on your country and the product area. An overview of our worldwide partners can be found here: WEH Worldwide.

Or simply contact our headquarters – via the contact form or by e-mail. We will forward your inquiry directly to the right representative.

You can obtain spare part drawings directly from our expert team – by phone, e-mail, or contact form.

You can find your responsible local representative here: WEH Worldwide.

All available operating instructions can be found online:
shop.weh.com/en/downloads/operating-instructions

Didn’t find what you’re looking for? Our expert team will be happy to help – or your responsible local representative worldwide: WEH Worldwide.

The appropriate lubricant depends on the device.
Please check the information in the operating instructions or contact our WEH® team.

For an overview of the operating instructions: shop.weh.com/en/downloads/operating-instructions

The cost of servicing breathing air equipment can vary depending on the device and its condition. We are happy to provide individual advice.

Please contact our service team directly:

📧 service@weh.com
📞 +49 7303 9609 0

We will gladly provide you with a non-binding quote.

The cost of servicing refueling components can vary depending on the device and its condition. We are happy to provide individual advice.

Please contact our service team directly:

📧 service@weh.com
📞 +49 7303 9609 0

We will gladly provide you with a non-binding quote.

• The product must be checked at least every 3 months, depending on the operating conditions.
• The product must be sent to WEH for maintenance after 20,000 cycles or 3 years, whichever comes first.
• If any abnormalities are detected during a regular inspection, the product should be sent for maintenance immediately.
• Failure to perform regular maintenance may result in leaks, malfunctions, or even accidents.

Refueling components such as breakaway couplings and fueling nozzles have a service interval of 3 years or 20,000 cycles (whichever comes first), starting from the delivery date.

Products used in maritime applications must be sent to WEH for maintenance no later than 12 months after delivery.

Replace the seal if there is visible wear, leaks, or routinely after approximately 1,000 test cycles (front seal).

The exact maintenance instructions can be found in the respective operating instructions: shop.weh.com/en/downloads/operating-instructions

Tip: Regular visual inspections and preventive replacement help increase operational safety.

The required tools depend on the type of connector.

The exact specifications can be found in the respective operating instructions: shop.weh.com/en/downloads/operating-instructions

Please contact our WEH® Service.
Use our service form—simply fill it out and submit it.

Alternatively, you can contact us directly:
📧 service@weh.com
📞 +49 7303 9609 0

Yes, for estimates that do not result in a repair order, we charge a flat fee of €95. This fee is only due if you decide against a repair or overhaul after the assessment. If you place the order with us, the fee will be waived in full.

WEH® Products should be regularly inspected and maintained to ensure safety and functionality over the long term. According to the manufacturer’s specifications:

• The product must be checked at least every 3 months, depending on the operating conditions.
• The product must be sent to WEH for maintenance after 20,000 cycles or 3 years, whichever comes first.
• If any abnormalities are detected during a regular inspection, the product should be sent for maintenance immediately.
• Failure to perform regular maintenance may result in leaks, malfunctions, or even accidents.

Please note that this information is of a general nature and may vary depending on the application. The specific maintenance requirements for your product can be found in the respective operating instructions.

For an overview of the operating instructions: shop.weh.com/en/downloads/operating-instructions

For maximum safety and longevity, we generally recommend having maintenance performed by our WEH® Service. Our experts analyze, overhaul, and test your connectors using original parts—efficiently and with full functional guarantee.
Learn more about WEH® Service.

Alternatively, you can perform maintenance yourself (at your own risk). Suitable replacement parts are available directly from us. Please note, however, that self-performed repairs may affect the warranty.

Important: This information is of a general nature and may vary depending on the application. The specific maintenance requirements for your product can be found in the respective operating instructions.
For an overview of operating instructions: shop.weh.com/en/downloads/operating-instructions

WEH® Connectors have a warranty period of 12 months from the date of delivery, in accordance with our General Terms and Conditions (GTC).

View the GTC.

In many cases, using a device at a pressure lower than the maximum allowable operating pressure is possible without issue. However, we recommend checking this on a case-by-case basis—especially with regard to the safety requirements of your application.

If you are unsure, we will be happy to advise you on the suitable pressure ranges for your device.

Many of our standard WEH® Quick Connectors and spare parts are available from stock—in this case, delivery usually takes place within one week.
Products that require assembly are generally shipped within 3 to 4 weeks.
For customized solutions or specially manufactured parts, delivery time can range between 6 and 8 weeks—in some cases up to 10 weeks.

Our goal: to deliver as quickly as possible—so your processes continue to run smoothly.

To develop or recommend the right connector for your application, we need detailed drawings—ideally including dimensions and tolerance specifications.

In special cases, e.g., with valves featuring a residual pressure pin or complex geometries, we specifically request test samples. This ensures that the connector fits perfectly and meets your requirements.

To ensure you can always rely on the proven WEH quality and safety, only WEH® original parts may be used—especially for safety-relevant components such as O-rings. Our sealing elements are precisely matched to each product—in geometry, material, and resistance. This is the only way we can guarantee reliable function and maximum service life.

Important: The use of non-original O-rings may lead to leaks or functional failures and can affect potential warranty claims.

The suitable original spare parts can be found in the respective operating instructions of your product: shop.weh.com/en/downloads/operating-instructions

Our team will be happy to advise you personally if you need support in selecting the right parts.

📧 industry@weh.com
📞 +49 7303 9609 703

Depending on the type: primarily stainless steel, in some cases brass. For special applications such as oxygen, Monel® or other special materials may also be used. The selection depends on the medium and the field of application.

Yes—we offer suitable quick connectors for rubber hoses. For this, we require a sample of the hose as well as information about pressure, medium, and test procedure in order to provide the optimal solution.

In the WEH® Shop, you can easily filter connectors by connection type, medium, and application.
In our catalogs, you’ll also find tables with standard connections. For special connections, we also offer customized quick connectors.

For special connections, we also offer customized quick connectors.

Often the fastest way to the right solution—contact our experts:
📧 industry@weh.com
📞 +49 7303 9609 703

In many cases, we are already familiar with the medium from previous projects. If not, please send us the safety data sheet. Our engineering team will then check whether a suitable solution is possible.

The service life is 15 years. After this period, the product may no longer be sent in for maintenance or repair—even if it still appears to be intact externally.

y default, a WEH® Connector is designed for a single connection – with medium supply on the opposite side. For special applications, we also offer double or multiple connectors.

You can find more information on our page for customized quick connectors.
Or contact us directly – we’ll be happy to advise you.

The allowable maximum pressure depends on the product type and the application. Please refer to the specifications in the respective data sheet or catalog.

You can find all information in the datasheet on the product detail page in our shop or in the WEH® catalog:
shop.weh.com/en/downloads/catalogs-and-brochures

If you have any questions, we’ll be happy to advise you personally.

WEH® Connectors stand for the highest quality, safety, and reliability – and have been successfully used worldwide for decades.
The original WEH® Jaw Locking Mechanism enables fast, leak-tight connections in seconds – without screws.

Our products are durable (lifespan: up to 15 years), service-friendly, and designed for demanding test media.
In addition, we offer customized solutions, precisely tailored to your application.

👉 Learn more about the WEH® Benefits
👉 Discover customized quick connectors

In principle, WEH^® pressure generators and pressure vessels are designed for static applications.
For dynamic applications, please contact us.

WEH^® components offer flexible connection options – provided that technical specifications are observed:

• Connection possible with cone-and-thread components of the same pressure rating
• Requirement: Use of a 60° sealing cone in both systems
• Note: Mixing different systems can impair service life and tightness
• Recommendation: Combination only after technical testing

👉 Further information on WEH® components and compatibility

WEH^® components use different sealing cones depending on the pressure level – for maximum safety and tightness:

• 7,000 bar / 100,000 psi and 10,000 bar / 150,000 psi: Special 120° sealing cone
• Higher force on the sealing point → improved sealing effect
• 2,500 bar / 35,000 psi and 4,200 bar / 60,000 psi: Standard 60° sealing cone
• Goal: Optimal sealing at all pressure levels

👉 More about WEH® sealing cones and areas of application

During the screw connection process of baromax components, the sealing seat is deliberately deformed for optimum sealing effect:

• Deliberate deformation of the sealing seat during initial assembly
• Reworking required when reassembling
• Special cone reworking tool available
• Recommendation: Rework fitting a maximum of 2–3 times
• Goal: Long-term tightness and secure connection

👉 Further information on reworking components

WEH^® fittings and components offer reliable sealing for different media:

• Fittings: Metal sealing, suitable for liquids and gaseous media
• Valves, vessels, pressure generators: With soft seals, designed for liquids in fluid group 2 (DGR)
• Gaseous media: Applicability must be checked
• Special requirements for certain volumes: Testing in accordance with the Pressure Equipment Directive is required
• Recommendation: Contact WEH with specific requirements

👉 Further information on WEH® fittings and DGR-compliant applications

WEH^® fittings and components provide reliable sealing for various media:

• Fittings: Metallic sealing, suitable for liquid and gaseous media
• Valves, vessels, pressure generators: Equipped with soft seals, designed for liquids in Fluid Group 2 (PED)
• Gaseous media: Applicability must be evaluated
• Special requirements for certain volumes: Comply with the specifications of the Pressure Equipment Directive
• Recommendation: Simply contact WEH with your specific requirements

👉 More information on WEH® fittings and PED-compliant applications

In general, they are suitable for liquid and gaseous media—as long as the medium is compatible with the respective seal material.

You can find details in the data sheet on the respective product page, in the catalog, or directly from our expert team.

📧 industry@weh.com
📞 +49 7303 9609 705

A different cracking pressure is possible by selecting an appropriate item with a stronger or weaker spring. This depends on spring availability and the available installation space

Our team will gladly advise you on the suitable option.
📧 industry@weh.com
📞 +49 7303 9609 705

The delivery time depends on the product type and configuration:

• RM (Ready-Made): approx. 3–5 business days
• AH (At-Hand): approx. 2–3 weeks
• Special versions (e.g., custom seals/springs): approx. 8 weeks

The respective designation can be found directly in the catalog or upon request from our expert team.

WEH^® Check Valves are available for liquid and gaseous media—matched to the medium, temperature, and pressure.

The appropriate sealing material is crucial: our standard is FKM.
Other materials, such as EPDM, FFKM, or NBR, are also available upon request.

The selection depends on your application—our team will gladly advise you.

The flow rate depends on the nominal bores of the valve. The corresponding Kv values can be found directly on the product page in the shop, catalog, or data sheets.

Visit the shop
Or contact our expert team—we’re happy to help:

📧 industry@weh.com
📞 +49 7303 9609 705

The maximum operating pressure depends on the valve type:

• TVR200, TVR2, TVR400: up to 250 bar
• TVR300: up to 100 bar
• TVR60: up to 300 bar
• TVR61: approx. 20–40 bar

For higher requirements, we are happy to evaluate tailor made solutions—just contact us:
📧 industry@weh.com
📞 +49 7303 9609 705

Depending on the product and filter element, we offer filtration grades ranging from 10 µm to 50 µm. The exact configuration depends on the specific application.

👉 For more details, please refer to the product detail page or the data sheet: Learn more

Yes, the filter elements are replaceable.

• Coalescing filter elements must be replaced once they are saturated.
• Surface filters, such as wire wound filters, can be cleaned and reused
  depending on the level of contamination.

For maintenance details, please refer to the respective operating instructions. 

Most of our filters are maintenance-free.
If necessary, the filter element can be replaced by the customer or – depending on the type – cleaned and reused.

For maintenance details, please refer to the respective operating instructions.

Wire wound filters offer several advantages – especially for demanding applications:

• Higher pressure resistance
• Lower pressure drop & higher flow rates
• Easy to clean & reusable
• Durable under heavy contamination
• Longer service life thanks to larger filter surface

For more information, visit the product page.

WEH^® filters use different elements depending on the application:

• Coalescing filters → for separating liquids
• Surface filters, such as wire wound or wire-mesh filters → for particle filtration

The choice of filter type depends on the medium and the application area.

The right filter depends on the medium, pressure, temperature, installation conditions, and the required separation efficiency.

For many applications, we already offer standard solutions, such as:

• Hydrogen (H₂), CNG, Oxygen (O₂): Special particle and coalescing filter
• Pre-filters: For coarse particles
• Coalescing filters: For liquid aerosols (e.g., oil, water) and fine particles

Not sure? We’re happy to advise you and also offer customized filter solutions:

📧 industry@weh.com

📞 +49 7303 9609 703

The replacement or cleaning interval depends on the medium and operating conditions.

For heavily contaminated media or high flow rates, more frequent replacements are necessary.
We recommend regularly checking the filters and replacing or cleaning them in cases of:

• visible contamination
• increased differential pressure
• or as specified in the application guidelines.

For optimal operational reliability and service life, maintenance intervals should be tailored individually.

You can find more information in the respective operating instructions.

If you have any questions or uncertainties, we are happy to assist you personally:

📧 industry@weh.com

📞 +49 7303 9609 703

Yes – spare parts and filter elements can be reordered from us at any time. Our experts are happy to help you find the right components for your product:

📧 industry@weh.com
📞 +49 7303 9609 703

Refueling components such as breakaway couplings and fueling nozzles have a service interval of 3 years or 20,000 cycles (whichever comes first), starting from the delivery date.

Products used in maritime applications must be sent to WEH for maintenance no later than 12 months after delivery.

During purging, nitrogen or dry air is fed into the designated drain holes of the H2 filling coupling via the purge line in order to expel or drain moisture/condensation and thus prevent ice formation (freezing) during and after refueling.

Further details here

The TK20 H2 was designed as a further development of the proven TK17 H2 with a focus on higher performance, safety, and user friendliness:

- H35 version: Optimized Kv value for improved flow
- H70 version: Suitable for flow rates of up to 90 g/s
- Globally standardized data interface for all variants
- Purge function available even for non-IR versions
- Improved leak-tightness in the low-pressure range
- More robust swivel joint for high cycle counts
- Completely redesigned internal components using high-quality materials
- Color coding (red/green) to indicate connection status
- MAWP: 962.5 bar (H70) / 481.25 bar (H35)

👉 To the product page TK20 H2

According to ISO 19880-1:2020 and ISO 17268-1:2024(E), a distinction is made between two pressure terms:

MOP (Maximum Operating Pressure):
Applies to vehicle components such as receptacles
– H35: 43.75 MPa
– H70: 87.5 MPa

MAWP (Maximum Allowable Working Pressure):
Applies to fueling station components such as nozzles, hoses, and breakaway devices
– H35: 48.125 MPa
– H70: 96.25 MPa

According to the Pressure Equipment Directive, the MAWP (PS) is decisive for design.

Upon request, WEH provides the corresponding manufacturer certificates.
Electrical components installed in equipment can represent a potential ignition source. Therefore, WEH uses only certified data interfaces in its fueling nozzles.

WEH refueling components meet the highest requirements according to ISO standards – ensuring safe and high-performance hydrogen refueling:

- ISO 19880-1: Standard flow rate of 60 g/s (“Normal Flow”)
- H35 MF (formerly H35 HF): For up to 120 g/s in passenger vehicle -refueling
- Term “High-Flow”: Reserved exclusively for heavy-duty vehicle refueling
- TK20 series: Flow rates of up to 90 g/s with minimal pressure drop
- TK16-H35, TK17-H35, and TK17-H70: Designed for 60 g/s

👉 To the WEH refueling nozzle product overview

WEH provides comprehensive flow measurement protocols for its refueling components – ensuring maximum transparency and comparability:

- Provision of official measurement reports
- Specification of the Kv value (m³/h at Δp = 1 bar)
- Reference medium: air, or water for larger cross-sections
- Uniform basis for design and comparison

When refueling with pre-cooled hydrogen, individual components can become chilled and freeze – a phenomenon referred to as freezing:

- Affected components: breakaway couplings, hoses, fueling nozzles, receptacles
- Cause: Cooling effect from pre-cooled hydrogen
- Consequences: Condensation and icing
- Extreme case: Nozzle freezes onto the receptacle and cannot be removed immediately
- Remedy: Wait until the components have warmed up again

Prevention with Anti-Freeze Technology from WEH

The WEH Anti-Freeze Technology reliably prevents freezing during hydrogen refueling – for increased safety and availability:

- Integrated purge line in TK20 H2 70 MPa ENR and TK20 H2 35 MPa ENR
- Purging can be performed via the nozzle or the holder
- Additional anti-freeze measures implemented since July 2025
- New inverted holder for targeted drainage of condensate
- Detailed information available in the Q&A document

Refueling components such as breakaway couplings and fueling nozzles have a service interval of 3 years or 20,000 cycles (whichever comes first), starting from the delivery date.

Products used in maritime applications must be sent to WEH for maintenance no later than 12 months after delivery.