Nominal diameter: DN6
Working medium: air/nitrogen
Valve body weight: ≤0.25kg
Model: HY-PSV-AV
Technical parameters:
Nominal diameter: DN6
Working medium: air/nitrogen
Valve body weight: ≤0.25kg
Opening pressure: 50Kpa
Ambient temperature: -55℃～+70℃
Service life: not less than 5 years
Structural form: direct unloading structure
Interface: G1/4, external thread, including sealing ring
Aviation grade pressure relief valve
When a fluid system works under pressure, one thing matters more than almost anything else: keeping that pressure under control. This is especially true in aviation and aerospace applications, where a small valve may have a big job to do. Our Aviation Grade Pressure Relief Valve is designed for fluid systems that need dependable overpressure protection, stable operation, accurate pressure response, and reliable sealing.
At Xi'an Huiyuan Instrument Valve Co., Ltd., we have spent decades working in the fluid control field. We develop and manufacture Solenoid Valves, electrically controlled valves, pneumatically controlled valves, Pressure Reducing Valves, pressure relief valves, and special non-standard valves for demanding applications. Aviation and aerospace are not ordinary valve applications, so we pay close attention to the actual working conditions of each project.
Our aviation grade pressure relief valve can be developed according to the customer's medium, pressure range, connection method, installation space, operating environment, and system requirements. Rather than simply offering a standard industrial valve and asking the customer to adapt the system, we prefer to understand the system first and then work out a suitable valve solution.
A pressure relief valve has a simple purpose: when system pressure becomes too high, the valve opens and releases or redirects the excess pressure, helping protect downstream components and the complete fluid circuit. The FAA describes pressure relief valves as a type of system Safety Valve used to prevent excessive pressure from damaging components or hydraulic lines.
An aviation grade pressure relief valve is a pressure protection device used in aircraft, aerospace equipment, test systems, and other high-performance fluid control applications. Its basic job is easy to understand. Imagine a closed pipe or chamber being filled with pressurized fluid. If the pressure keeps rising beyond the safe operating point, something needs to respond before the pressure damages the system.
That is where the pressure relief valve comes in.
Under normal operating conditions, the valve remains closed and allows the fluid system to operate normally. When pressure reaches the designed opening point, the force created by the fluid becomes strong enough to overcome the closing force of the valve mechanism. The valve then opens and allows the excess pressure to be relieved through the designed outlet or return path.
After the pressure falls to a suitable level, the valve can return toward its closed position. This basic action sounds simple, but getting it right requires careful engineering. The opening pressure, sealing performance, spring or actuator characteristics, flow path, material selection, connection design, and installation conditions all affect actual valve performance.
For aviation applications, the valve may also need to work in a compact installation space and under changing temperature, vibration, pressure, or environmental conditions. RTCA's DO-160 standard provides environmental and electromagnetic test methods for airborne equipment, illustrating why aviation equipment cannot be evaluated only under normal room conditions.
Operating condition
Valve condition
Purpose
Normal system pressure | Normally closed | Maintain the designed fluid circuit |
Pressure reaches set point | Begins to open | Respond to excessive pressure |
Overpressure condition | Relieves or redirects fluid | Reduce pressure and protect the system |
Pressure returns to a suitable level | Returns toward closed position | Restore normal system operation |
Source: General operating principles described by the FAA for Aircraft pressure relief valves. Actual valve behavior depends on the specific design and application.
The working principle of our pressure relief valve is based on pressure force and a controlled opening mechanism. In a typical spring-loaded design, the valve element is held against its seat by a spring force. System pressure acts against the valve element.
When system pressure remains below the set pressure, the closing force is sufficient to keep the valve sealed. When pressure rises to the designed opening point, the fluid force becomes strong enough to move the valve element away from its seat.
This allows part of the fluid to leave the protected pressure zone through the relief path. As pressure decreases, the valve moves back toward its seat.
The FAA's aircraft maintenance handbook describes this basic principle for aircraft hydraulic pressure relief valves: spring tension can be used to determine the pressure at which the valve opens, while the valve provides protection against excessive system pressure.
Of course, real aerospace projects can be more complicated. The medium may be hydraulic oil, fuel, gas, air, or another engineered fluid. The system may also require special materials, compact construction, a particular flow direction, special sealing, or non-standard mounting.
For this reason, we do not recommend selecting an aviation pressure relief valve only by nominal size. We normally review the complete working condition first.
Item
Why It Matters
Medium | Influences material, seal and compatibility requirements |
Working pressure | Defines the normal operating range |
Set pressure | Determines when pressure relief should begin |
Relief flow | Helps determine the required flow capacity |
Temperature | Affects materials, seals and valve performance |
Connection | Must match the customer's fluid system |
Installation space | Important for aircraft and compact equipment |
Environmental conditions | May affect qualification and reliability requirements |
Source: API pressure-relief guidance identifies sizing, selection and installation as important parts of pressure-relieving device engineering.
For a pressure protection valve, the opening pressure is one of the most important characteristics. We focus on controlled pressure response and repeatable performance during manufacturing and inspection.
The exact set pressure is not a universal number. It depends on the customer's system design. For this reason, we confirm the required pressure range and operating conditions before production instead of using one fixed specification for every project.
A relief valve should not continuously leak during normal operation. Good seat design, suitable sealing materials, proper machining, and careful assembly all contribute to sealing performance.
For projects involving gas or other sensitive media, sealing requirements may be particularly important. We therefore treat pressure and sealing tests as essential parts of product inspection.
Space is often limited in aircraft, aerospace equipment, test rigs, and integrated fluid systems. A valve may need to fit into an existing manifold or a small equipment compartment.
Our engineering team can develop non-standard valve configurations according to installation requirements, connection arrangements, and customer drawings.
Our experience with special non-standard valves is useful when a normal catalog product does not fit the application. We can discuss the medium, pressure, flow, interface, material, installation method, and control requirements before confirming a technical solution.
We have long supplied specialized control valves for aerospace, commercial aerospace, nuclear power, shipbuilding, military-related applications, and research institutes. These projects have taught us an important lesson: valve reliability starts with understanding the real system, not simply choosing a product name.
The main advantage of an aviation grade pressure relief valve is its ability to provide pressure protection in systems where reliability and controlled performance are important.
Aircraft hydraulic systems use pressurized fluid to support important functions. A pressure relief valve can help protect hydraulic lines and components when system pressure exceeds the intended limit. The FAA specifically identifies pressure relief valves as a means of preventing excessive pressure from causing component failure or hydraulic line rupture.
Fuel and other aircraft fluid systems may require controlled pressure protection depending on the system architecture. Valve selection should consider the fluid characteristics, pressure range, temperature, sealing requirements, and applicable project specifications.
Before an aerospace product reaches flight use, engineers often need ground test systems to verify components and fluid circuits. These test systems can involve high pressure, repeated operation, and special test media.
Our customized pressure relief valves can be developed for aerospace test equipment where standard industrial valve configurations may not be suitable.
Commercial rockets and satellites use complex fluid systems for different functions. Pressure protection can be important in tanks, pipelines, gas systems, test systems, and other fluid-control equipment.
Huiyuan has experience developing core valves and fluid control systems for commercial aerospace applications. We understand that aerospace valve projects often involve special requirements rather than simple standard orders.
Research institutes often work with new equipment and changing test conditions. A pressure relief valve may need to be customized around a particular experimental system.
We provide special non-standard valves and fluid control solutions for research institutes, including products developed around customer drawings, system requirements, and testing conditions.
Although the product is positioned for aviation-grade and aerospace applications, pressure relief valves are also widely used in petrochemical plants, natural gas systems, power equipment, ships, machinery, gas systems, and experimental testing equipment.
API maintains standards and recommended practices covering pressure-relieving device sizing, selection, installation, pressure-relieving systems, flanged steel pressure relief valves, and seat tightness. This shows how pressure protection is an important engineering topic across process industries as well.
We believe that a good pressure relief valve should not only look well made. It should also behave correctly when installed in the customer's system.
That is why our manufacturing process covers material preparation, machining, component inspection, assembly, adjustment, pressure testing, sealing inspection, opening pressure testing, and final inspection according to the product design and customer requirements.
For an aviation grade pressure relief valve, we pay special attention to several areas.
Pressure setting: The valve must respond according to the agreed pressure requirement.
Sealing: The closed valve should meet the specified leakage requirement.
Mechanical movement: Internal components should move smoothly and consistently.
Connection quality: The valve interface should match the customer's installation system.
Surface and appearance: Finished products are checked before delivery.
Documentation: Inspection and delivery documents can be prepared according to project requirements.
Inspection
Purpose
Application
Pressure test | Check pressure resistance and system integrity | Before delivery |
Leakage test | Check seat and sealing performance | Before delivery |
Opening pressure test | Verify pressure response | According to specification |
Reset or reseating test | Check return toward the closed condition | According to design |
Appearance inspection | Check workmanship and visible defects | Final inspection |
Source: API identifies pressure-relief device sizing, selection, installation and seat tightness as important engineering and inspection topics.
For aerospace projects, the customer's qualification requirements may go beyond normal valve inspection. For example, airborne equipment can be subject to environmental and electromagnetic qualification requirements. RTCA states that DO-160 provides environmental and EMI test procedures for airborne equipment.
We therefore do not claim that every valve automatically carries a specific aviation qualification. Instead, we review the project specification and confirm which tests, certificates, reports, or qualification requirements apply to the actual product.
Production time for an aviation grade pressure relief valve depends on the actual design. Standard products can normally be arranged more quickly, while customized valves require technical confirmation before production begins.
The main factors affecting the production cycle include valve structure, pressure range, material, connection type, quantity, sealing requirements, inspection requirements, and whether special testing is required.
For standard products, we can arrange production according to stock and manufacturing capacity. For customized aerospace valves, we first review the technical requirements, confirm drawings and specifications, and then arrange manufacturing. A final delivery date is confirmed after the technical solution and order details are agreed.
Before shipment, we carry out the required pressure, sealing, opening, reset, appearance, and other inspections according to the product specification and contract requirements. The final delivery package can include product documentation and inspection records according to the customer's project needs.
For international and industrial orders, payment can be arranged by advance payment, payment before shipment, or other terms agreed in the sales contract. For customized aerospace products, payment and production arrangements are normally confirmed after the technical requirements and commercial terms have been finalized.
Depending on the order size, destination, delivery time, and customer preference, we can arrange transportation by international logistics, express service, or dedicated freight service.
Valve packaging normally uses cartons, wooden cases, or pallets according to product size and transportation requirements. We also provide suitable protection against moisture, vibration, impact, and handling damage. For precision or customized aerospace valves, packaging requirements can be discussed before shipment.
There are many valve manufacturers in the market. We do not believe that simply saying “high quality” is enough. Customers need to know what a manufacturer can actually do.
First, our company has decades of experience in fluid control. Xi'an Huiyuan Instrument Valve Co., Ltd. was formerly the Solenoid Valve Branch of Xi'an Instrument Factory and was restructured into a joint-stock company in 1994. Today, we combine product development, manufacturing, and technical service.
Second, our product range is focused on fluid control. We manufacture fluid solenoid valves, electric control valves, pneumatic control valves, pressure reducing valves, and special non-standard valves. This means we understand how a pressure relief valve may work together with other valves in a larger fluid control system.
Third, aerospace and research applications are an important part of our development direction. We have provided specialized valve products for aerospace, commercial aerospace, nuclear power, shipbuilding, military-related applications, and research institutes.
Fourth, we are comfortable with customized products. A research institute or aerospace company may come to us with a drawing, interface requirement, special medium, unusual installation space, or specific pressure response requirement. We can discuss the technical problem first rather than forcing every project into a standard catalog model.
Our company has also obtained recognition including High-Tech Enterprise status and Contract-Abiding and Creditworthy recognition. We have passed ISO 9001:2015, CE, SIL3 mandatory safety, and 3C mandatory certification requirements in relevant areas, providing a foundation for our quality management and market development.
Most importantly, we try to keep communication practical. If you are selecting an aviation pressure relief valve, we want to know what the valve actually needs to do. That helps us avoid unnecessary specifications and focus on the performance that matters.
Its main purpose is to protect a fluid system from excessive pressure. When pressure reaches the designed set point, the valve responds by opening or relieving pressure through the intended flow path.
Yes. We have extensive experience with special non-standard valves. Customization can involve the valve structure, connection, material, pressure setting, sealing arrangement, installation dimensions, and other project-specific requirements.
We recommend providing the working medium, normal working pressure, required relief or set pressure, temperature, flow requirement, connection type, installation space, quantity, and any applicable drawings or technical standards. If you have a system diagram, that can also be helpful.
It can be developed for suitable aircraft hydraulic applications, subject to the actual system requirements. The FAA identifies pressure relief valves as protection devices in aircraft hydraulic systems. The final product specification, qualification and acceptance requirements should be confirmed for each aircraft or aerospace project.
Yes. Aerospace test systems are one of the areas where our special non-standard valve experience can be useful. We can review the test medium, pressure, flow, connection, installation and operating conditions before proposing a valve solution.
No. DO-160 is an environmental and electromagnetic test standard for airborne equipment, and whether a specific valve needs DO-160 testing depends on its role, installation, qualification plan, and project requirements. RTCA identifies DO-160G as the current published version while related revision work continues. We recommend confirming the applicable qualification requirements before placing an aerospace order.
It depends on the model and project requirements. Standard products can normally be produced faster, while customized aviation pressure relief valves require technical review, drawing confirmation, material preparation, machining, assembly, testing, and final inspection. We provide a confirmed delivery schedule after reviewing the order.
We can arrange logistics, express delivery, or dedicated transportation according to the destination and order requirements. Products are packed in cartons, wooden cases, or pallets with suitable protection against moisture, vibration and impact.
The valve must be suitable for the pressure and flow conditions of the protected system. API 520 specifically addresses the sizing and selection of pressure-relieving devices, while API 521 covers pressure-relieving and depressuring system design. For an aviation or aerospace project, the final sizing should also consider the specific system design and applicable project requirements.
An aviation grade pressure relief valve may look like a relatively small component, but its role in a pressurized fluid system can be very important. It provides a controlled response when pressure becomes too high and helps protect the equipment connected to the system.
At Xi'an Huiyuan Instrument Valve Co., Ltd., we focus on more than simply supplying a valve. We develop fluid control products for demanding industrial, aerospace, commercial spaceflight, nuclear power, shipbuilding, and research applications. Our experience with special non-standard valves allows us to work with customers when standard products are not enough.
If you are looking for an aviation grade pressure relief valve, aircraft pressure relief valve, aerospace pressure relief valve, or customized pressure protection valve, send us your technical requirements. We can review the working medium, pressure, temperature, flow, connection, installation conditions, and testing requirements, then discuss a suitable technical solution with you.
Note: Aviation and aerospace applications may require project-specific qualification, certification, environmental testing, material control, traceability, or customer acceptance requirements. The actual specification and compliance status of each valve should be confirmed against the applicable project documentation before purchase or installation.
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