Fuel Cell Mechanical Pressure Relief Valve HSXYF Series 5-300kW 100-300kPa Adjustable IP67

Fuel Cell Mechanical Pressure Relief Valve HSXYF Series for 5~300kW Systems Cracking Pressure 100~300kPa Adjustable Full Open Pressure +30% IP67 Protection

Quick Detail:

• Mechanical safety pressure relief valve developed for the hydrogen path of proton exchange membrane fuel cell (PEMFC)
• Core function: installed at the stack hydrogen inlet, automatically opens to relieve pressure when the hydrogen pressure exceeds the set value, keeping the hydrogen pressure within a safe range and protecting stack life
• Applicable power range: 5~300kW (covering passenger vehicles, commercial vehicles and stationary power stations)
• Structure: mechanical spring type, pure mechanical structure, no external power supply required, high reliability
• Nominal pressure: 100~300kPa gauge (optional); Cracking pressure: 100~300kPa gauge (optional)
• Full open pressure: cracking pressure +30% is regarded as fully open (gauge); Reseating pressure: cracking pressure -5% is regarded as reseated
• Flow bore: 5.5mm / 8mm; Working temperature: -35C~105C; Applicable media: H2, He
• Body material: SUS304 stainless steel / 6061-T6 aluminum alloy (optional)
• Sealing material: NBR (oil-resistant, temperature-resistant, corrosion-resistant)
• Protection class: IP67; Installation: vertical; Flow resistance: <=2kPa

Description:

In a fuel cell system, hydrogen enters the stack anode to participate in the reaction after pressure reduction from the storage system. The hydrogen pressure at the stack inlet needs to be controlled within a precise range: too low a pressure affects the stack power output, while too high a pressure may damage the proton exchange membrane and membrane electrode assembly, seriously affecting stack life. The pressure relief valve (safety valve) is the key safety protection device preventing stack overpressure.

The HSXYF series mechanical pressure relief valve is installed in the stack hydrogen inlet pipeline. Its core function is: when the stack inlet hydrogen pressure exceeds the set safety value, the relief valve opens automatically, discharging the excess hydrogen to the tailpipe, so that the stack inlet pressure quickly falls back within the safe range; when the pressure returns to normal, the relief valve automatically closes and reseats, ensuring normal system operation. This purely mechanical automatic response mechanism requires no external power supply or control signal and has extremely high reliability.

The HSXYF series uses a mechanical spring type structure. The working principle is: the valve spool remains closed under the preload of the spring. When the pressure acting on the spool from the inlet hydrogen exceeds the spring preload, the spool is pushed open and hydrogen is discharged through the relief port; when the pressure drops below the reseating pressure, the spring force pushes the spool back to the closed position.

The product offers a rich selection of configurations; the cracking pressure (100~300kPa gauge) can be selected according to the pressure requirements of different stack systems. The flow bore offers two specifications, 5.5mm and 8mm. The body material offers SUS304 stainless steel and 6061-T6 aluminum alloy; the aluminum alloy housing is lighter (40~60g), while the stainless steel housing is more corrosion-resistant (about 200g).

The product offers multiple interfaces, flexibly selectable according to customer needs. The protection class is IP67, meeting harsh vehicle waterproof and dustproof requirements. The working temperature range covers -35C~105C, adapting to extreme climate conditions. The flow resistance is <=2kPa, with minimal impact on the system hydrogen supply pressure.

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)
• Hydrogen fuel cell ships
• Fuel cell forklifts and port material handling equipment
• Fuel cell system test benches

Typical application position: installed in the stack hydrogen inlet pipeline; automatically opens to relieve pressure when the hydrogen pressure exceeds the set value, protecting stack safety. The relief bore of the relief valve should meet the relief demand of the fuel cell stack at the safe pressure.

Company Advantages:

Shanghai Yibaijia Hydrogen Energy Technology Co., Ltd., as a professional hydrogen energy parts supply platform, distributes the HSXYF series mechanical pressure relief valves (safety valves) dedicated to fuel cells. The HSXYF series uses a mechanical spring type structure with an adjustable cracking pressure of 100~300kPa, a full open pressure of cracking pressure +30%, flow bores of 5.5mm/8mm, protection class IP67 and a working temperature covering -35C~105C. 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 a fuel cell system need a pressure relief valve (safety valve)?
A: The stack inlet hydrogen pressure needs to be controlled within a precise range: too low a pressure affects power output, while too high a pressure may damage the proton exchange membrane and membrane electrode assembly. The role of the relief valve is to automatically open to relieve pressure when the stack inlet hydrogen pressure exceeds the safe value, keeping the hydrogen pressure within a safe range and protecting stack life.

Q5: What is the working principle of the relief valve?
A: The HSXYF series uses a mechanical spring type structure. The valve spool remains closed under the spring preload. When the inlet hydrogen pressure exceeds the spring preload, the spool is pushed open and hydrogen is discharged through the relief port; when the pressure drops below the reseating pressure, the spring force pushes the spool back to the closed position. The whole process is purely mechanical response with no external power supply.

Q6: What is the cracking pressure of the relief valve?
A: The cracking pressure can be selected within the range of 100~300kPa gauge.

Q7: What flow bores are available?
A: Two specifications, 5.5mm and 8mm.

Q8: What is the difference between the aluminum alloy and stainless steel housing?
A: The aluminum alloy housing is lighter (HSXYF-6211 about 40g, HSXYF-621L about 60g), suitable for weight-sensitive applications; the stainless steel housing is more corrosion-resistant (HSXYF-421L about 200g), suitable for corrosive environments.

Q9: What are the installation requirements?
A: Vertical installation is recommended. The relief bore should meet the relief demand of the fuel cell stack at the safe pressure.

Q10: 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.