Fuel Cell Integrated Check Valve LN-OWV Series 316L 0.9kPa Opening Pressure Anti Backflow

Fuel Cell Integrated Check Valve LN-OWV Series Automotive-Grade Design 316L Material 0.9kPa Cracking Pressure Anti-Backflow for Parallel Architecture of Hydrogen Circulation Pump and Ejector

Quick Detail:

• Integrated check valve developed for the hydrogen path of proton exchange membrane fuel cell (PEMFC)
• Core function: prevents gas backflow in the hydrogen path, ensuring the gas can only flow in one direction
• Cracking pressure: 0.9kPa (extremely low cracking pressure, ensuring low system flow resistance)
• Material: stainless steel 316L (corrosion-resistant, hydrogen permeation resistant)
• Flow: 2.9g/s hydrogen @ 7.2kPa; Outlet pressure: 0~2.0barg
• Working temperature: -40C ~ +105C; Operating humidity: 10~95% RH
• Port type: 25mm double barb; Sealing ring material: EPDM (hydrogen-resistant, aging-resistant)
• Automotive-grade design, meeting harsh vehicle environment requirements

Description:

In the fuel cell hydrogen path, the check valve (non-return valve) is a key component ensuring the gas flows in the correct direction. Its core function is to allow gas to pass in one direction while preventing backflow, ensuring the gas flow direction in each link of the system is correct and mutually non-interfering.

The LN-OWV series integrated check valve is an automotive-grade product developed by Luanniao Electric specifically for the fuel cell hydrogen path. It uses a stainless steel 316L body throughout, offering excellent corrosion resistance and hydrogen permeation resistance. The cracking pressure is only 0.9kPa, which can effectively avoid the problem of excessive flow resistance caused by overcoming the spring force. The working temperature is -40C~105C, meeting extreme vehicle environment requirements.

Typical application scenarios of the hydrogen path check valve include:

1. Parallel architecture of hydrogen circulation pump and ejector (core application): in high-power fuel cell systems, the hydrogen circulation pump and ejector are usually used in parallel to jointly complete hydrogen recirculation. In the low-power range the hydrogen circulation pump provides a stable recirculation flow; in the high-power range the circulation pump is closed and switched to the ejector to realize hydrogen recirculation using the Venturi effect. However, when the two are in parallel, the hydrogen circulated from the ejector may flow backward through the hydrogen circulation pump, seriously affecting system power and hydrogen utilization. Installing a check valve at the circulation pump outlet or the ejector outlet pipeline can effectively prevent gas backflow and ensure the correct hydrogen recirculation path in different power ranges.

2. Anti-backflow of the hydrogen supply pipeline: installing a check valve in the hydrogen supply pipeline from the storage system to the fuel cell system can prevent hydrogen from flowing backward from the fuel cell system to the storage system when the system shuts down or fails, ensuring system safety.

3. Stack housing purge pipeline: there may be a small amount of leaked hydrogen in the stack housing; a check valve is also needed in the housing purge pipeline to prevent hydrogen backflow.

4. Hydrogen discharge pipeline: installing a check valve in the hydrogen discharge pipeline can prevent external air or impurities from flowing back into the hydrogen system.

The LN-OWV series uses a double barb port type, convenient for pipeline connection. The sealing ring material is EPDM, hydrogen-resistant and aging-resistant, ensuring long-term reliable sealing. The product has passed third-party CNAS certification and is widely used in buses, passenger vehicles, trucks, special vehicles, construction machinery, forklifts, ships, combined heat and power and other fields.

Specifications:

Electrical / Optical Characteristics (Ta=25C +/-3C). See product specification image.

Applications:

This product is widely used in the hydrogen path of various proton exchange membrane fuel cell (PEMFC) systems, specifically including:

• Hydrogen fuel commercial vehicles (heavy trucks, city buses, logistics vehicles, cold-chain logistics vehicles)
• Hydrogen fuel passenger vehicles (sedans, SUVs)
• Stationary fuel cell power stations (backup power, distributed energy systems, combined heat and power)
• Hydrogen fuel cell ships
• Fuel cell forklifts and port material handling equipment
• Fuel cell construction machinery
• Fuel cell system test benches

Typical application positions:

• Parallel pipeline of hydrogen circulation pump and ejector: prevent gas backflow and cross-flow, ensuring the correct hydrogen recirculation path in different power ranges
• Hydrogen supply pipeline (storage system to fuel cell system): prevent hydrogen from flowing back to the storage system during shutdown
• Stack housing purge pipeline: prevent hydrogen backflow during purging
• Hydrogen discharge pipeline: prevent external air from flowing back

Company Advantages:

Shanghai Yibaijia Hydrogen Energy Technology Co., Ltd., as a professional hydrogen energy parts supply platform, distributes the LN-OWV series integrated check valves dedicated to fuel cells. The LN-OWV series uses stainless steel 316L, with a cracking pressure of only 0.9kPa, a working temperature covering -40C~105C and an automotive-grade design, widely used in the parallel architecture of hydrogen circulation pump and ejector, hydrogen supply pipeline, housing purge pipeline, hydrogen discharge pipeline and other scenarios. The product has passed third-party CNAS certification. The Shanghai Yibaijia team has more than 10 years of hydrogen energy industry experience and can provide full-process technical support from product selection and system matching to installation.

FAQ

Q1: Can you provide samples for testing?
A: Yes, we support sample orders for vehicle installation testing and performance verification, and also accept mixed-model sample orders.

Q2: What is the delivery lead time?
A: Sample orders usually take 5-7 working days; bulk orders (depending on order quantity) generally take 15-30 working days.

Q3: Is there a minimum order quantity (MOQ) limit?
A: 10-piece sample trial orders are supported, and bulk order prices are more favorable.

Q4: Why does the fuel cell hydrogen path need a check valve?
A: Multiple components in the hydrogen path (such as the hydrogen circulation pump, ejector and storage system) are interconnected. Without a check valve, gas may flow backward and cross-flow between different components, leading to reduced system power, lower hydrogen utilization and even safety hazards. The role of the check valve is to ensure the gas can only flow in one direction as designed and prevent backflow.

Q5: What is the cracking pressure of the LN-OWV series?
A: The cracking pressure is only 0.9kPa, far lower than a traditional spring check valve, effectively avoiding the problem of excessive flow resistance caused by overcoming the spring force.

Q6: What is the material of the check valve?
A: Stainless steel 316L, with excellent corrosion resistance and hydrogen permeation resistance.

Q7: What is the working temperature range?
A: -40C~105C, meeting extreme vehicle environment requirements.

Q8: What role does the check valve play in the parallel architecture of the hydrogen circulation pump and ejector?
A: In high-power fuel cell systems, the hydrogen circulation pump and ejector are usually used in parallel; the circulation pump is used in the low-power range and the ejector in the high-power range. The check valve prevents the hydrogen circulated from the ejector from flowing backward through the hydrogen circulation pump, ensuring the correct hydrogen recirculation path in different power ranges.

Q9: How to handle product failures?
A: We implement a strict quality control system, with an out-of-factory defect rate below 0.2%. During the warranty period, small batches of defective products will be replaced with new ones in the next order; batch quality problems will be negotiated for repair or replacement to ensure customer rights.