A22H/Y/W/F Safety Valve: The Ultimate Guide to Threaded Full-Open Safety Valves

——Discover how Shanghai WUYUE Pump Valve Group Co., Ltd. delivers reliable overpressure protection for air, steam, and corrosive media

When it comes to protecting pressure vessels, pipelines, and industrial systems from catastrophic overpressure events, the A22H/Y/W/F Safety Valve stands out as a robust, high-performance solution. This threaded, spring-loaded, fully open safety valve is designed for systems requiring maximum discharge capacity in a compact, economical package.

In this comprehensive guide, we’ll explore the product’s features, applications, technical specifications, and why Shanghai WUYUE Pump Valve Group Co., Ltd. is a trusted manufacturer in the safety valve industry.

What is the A22H/Y/W/F Safety Valve?

The A22H/Y/W/F spring fully open closed safety valve is a direct spring-loaded, threaded connection valve with a fully enclosed structure. It serves as the final overpressure protection device for non-hazardous, non-flammable, and non-explosive gas or liquid media pipelines and containers.

Key Characteristics:

• Full-Open Structure: Provides maximum discharge capacity when the valve lifts.

• Threaded Connection: Easy installation and maintenance without welding.

• Compact Size: Economical and space-saving design.

• Fully Enclosed Bonnet: Prevents leakage of medium to the atmosphere, suitable for indoor or sensitive environments.

The valve’s opening and closing parts are normally closed under spring force. When the system pressure exceeds the set value, the valve automatically opens, discharging the medium to the outside and reducing system pressure to a safe level.

Product Features and Functional Advantages

1. Full-Open Design for High Discharge Capacity

Unlike micro-open valves, the A22 series features a full-lift structure. When the set pressure is reached, the disc lifts completely, creating a large opening area. This allows rapid discharge of large volumes of gas or liquid, quickly reducing system pressure and preventing equipment damage.

2. Threaded Connections for Easy Installation

Available in sizes from DN15 to DN80, with standard male threads (R or G series). This makes the A22 ideal for retrofitting existing systems or installing in tight spaces where flanged valves are impractical.

3. Wide Material Selection for Various Media

The A22 series is available in multiple body materials to suit different applications:

4. Customizable Set Pressure Levels

The A22 series offers precise set pressure ranges to match your system requirements:

5. Compliance with International Standards

Designed and manufactured according to:

• Design: GB/T 12243

• Face-to-face dimensions: GB/T 12221

• Flange connections: JB/T 79 (or custom per ANSI/DIN/JIS)

• Testing & inspection: GB/T 12242

• Product marking: GB/T 12220

Additionally, Shanghai WUYUE can manufacture to American (ANSI/ASME), Japanese (JIS), German (DIN), Russian (GOST), and British (BS) standards upon request.

Applications of A22H/Y/W/F Safety Valves

The A22 series is widely used as an overpressure protection device in:

🔹 Boilers and Pressure Vessels

Protects small steam boilers, hot water boilers, and air receiver tanks from exceeding design pressure.

🔹 Air Compressors and Pneumatic Systems

Installed on discharge lines of reciprocating or screw compressors to prevent overpressure during start-up or blockage.

🔹 HVAC and Refrigeration

Used on chiller vessels, condenser coils, and solar thermal systems to relieve excess pressure caused by thermal expansion.

🔹 Chemical and Pharmaceutical

Stainless steel versions (A22W-P/R) protect reactors, storage tanks, and piping carrying corrosive or high-purity media.

🔹 Water Treatment and Plumbing

Cast iron or cast steel versions protect pressure filters, reverse osmosis vessels, and booster pump discharge lines.

🔹 Oil and Gas

Protects small separators, fuel gas trains, and lubrication systems from overpressure events.

Selection Guide: How to Choose the Right A22 Safety Valve

To select the correct A22H/Y/W/F safety valve for your application, consider the following factors:

1. Determine Required Discharge Capacity

The valve’s rated discharge must exceed the system’s required discharge volume – the amount of medium that must be relieved to prevent excessive overpressure. This is calculated based on system operating conditions, potential overpressure causes (e.g., fire, blocked outlet, thermal expansion), and capacity.

2. Select Body Material Based on Medium and Temperature

• Water, steam, oil ≤200°C: Cast iron (A22H) or cast steel (A22Y) are economical choices.

• Corrosive media: Use 304 stainless steel (A22W-P) for mild corrosion, 316/316L (A22W-R/R3) for severe corrosion (e.g., seawater, acetic acid, chlorides).

• High-temperature service (>300°C): Consider a valve with a radiator or special high-temperature trim.

3. Choose the Right Set Pressure

Select a set pressure that is at or below the system’s maximum allowable working pressure (MAWP). Use the set pressure level tables above to find the closest standard setting.

4. Consider Special Construction Requirements

• Radiator-equipped valve: Required when operating temperature exceeds 300°C for closed valves or 350°C for open valves.

• Bellows seal valve: Necessary when the valve experiences variable back pressure exceeding 10% of set pressure, or when handling toxic/corrosive media to protect the spring and guide mechanism.

• Cylinder-operated valve: For applications requiring remote or manual control of opening pressure.

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Why Choose Shanghai WUYUE Pump Valve Group Co., Ltd.?

Shanghai WUYUE Pump Valve Group Co., Ltd. has over 20 years of experience in designing and manufacturing high-quality safety valves. Here’s why global customers trust us:

✅ Comprehensive Customization Capabilities

We are not limited to standard products. Our engineering team can customize:

• Thread types (NPT, BSP, metric)

• Pressure ratings (up to 4.0 MPa or higher)

• Materials (Hastelloy, Monel, duplex stainless steel)

• Special coatings or PTFE linings

✅ Rigorous Quality Control

Each A22 safety valve undergoes:

• Set pressure testing (accuracy within ±3%)

• Seat leakage testing (bubble-tight per API 527)

• Hydrostatic strength testing of the body

• Cycle testing for critical applications

✅ Global Compliance

We can design and manufacture according to:

• Chinese standards (GB, JB)

• American standards (ANSI, API, ASME)

• Japanese standards (JIS)

• German standards (DIN)

• Russian standards (GOST)

• British standards (BS)

✅ Competitive Pricing & Fast Delivery

With in-house manufacturing and a large inventory of raw materials, we offer:

• Shorter lead times than imported brands

• Cost-effective solutions (typically 30-40% lower than European or American equivalents)

• Reliable after-sales support and 12-month warranty

✅ Responsive Customer Service

Our international sales team responds to all inquiries within 24 hours. Email us at foreign_trade@0086pv.com for quotes, technical drawings, or selection assistance.

Dimensions and Ordering Information

Standard Dimensions (mm) – A22 Threaded Safety Valve

Note: Custom dimensions and thread types (NPT, BSPP, BSPT) available upon request.

How to Order

Please provide the following information when requesting a quote:

1. Valve model (e.g., A22W-16P)

2. Nominal diameter (DN15 to DN80)

3. Set pressure (MPa or bar)

4. Thread type and size (inlet and outlet)

5. Medium and operating temperature

6. Required quantity and destination port

Installation and Maintenance Tips

Installation:

• Install vertically with the valve stem upright.

• Ensure the inlet pipe is as short as possible and at least the same diameter as the valve inlet.

• Do not install a shut-off valve between the protected equipment and the safety valve.

• Provide adequate space for discharge and avoid directing discharge toward personnel or equipment.

Maintenance:

• Test the valve manually every 6 months using the lifting lever (if equipped).

• Check for visible corrosion, leakage, or damage during routine inspections.

• Replace the valve if it fails to reseal properly or if set pressure drifts beyond acceptable limits.

• For corrosive service, consider periodic disassembly and inspection of internal components.

Get Your A22H/Y/W/F Safety Valve Quote Today

Protect your pressure systems with reliable, high-capacity safety valves from Shanghai WUYUE. Visit our product page for detailed specifications:

🔗 A22H/Y/W/F Spring Fully Open Closed Safety Valve Product Page

For technical inquiries, custom requirements, or to request a quote, email us at:
📧 foreign_trade@0086pv.com

Our team will respond within 24 hours with drawings, pricing, and delivery information.

Shanghai WUYUE Pump Valve Group Co., Ltd.
Your Trusted Partner in Pressure Safety – Since 2002

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