Safety valves serve as the ultimate safeguard for pressure vessels and piping systems. Proper selection is essential to ensure personnel safety and equipment integrity. The following outlines key considerations for safety valve selection.The main safety valve product names of China Safety Valve Network include:Spring Low Lift Closed High Pressure Safety Valve,Spring Fall Lift Closed High Pressure Safety Valve,Spring Fall Lift Safety Valve,Spring Fall Lift Safety Valve, With RadiatorSpring Low Lift Air Compressor Safety Valve,(With Connecting Pipe)Safety Reflux ValveSingle Lever Safety Valve,Spring Fall Lift, Low Lift Thread Safety Valve,Sleeve Insulation Safety Valve

Define Operating Conditions and Medium Characteristics

The first step is understanding system parameters. For gas media, full-lift safety valves with a lift height of at least 0.25d₀ are recommended, offering maximum discharge capacity. For liquid media, either conventional lift valves (lift ≤0.05d₀) or full-lift designs may be used. High-temperature applications require valves with cooling fins to prevent spring失效 due to heat. For toxic, corrosive, or flammable media, closed-bonnet safety valves must be selected to direct discharge to a safe location.

Determine the Valve Type

Spring-loaded safety valves are the most widely used type, with set pressure adjusted by spring preload, suitable for a broad range of applications. Lever-weight valves feature a simple design and are common in small to medium low-pressure boilers. Pilot-operated valves, consisting of a main valve and a pilot valve, are ideal for high-pressure, large-diameter, and high-backpressure services.

Backpressure significantly affects safety valve performance. In high-backpressure systems, balanced-bellows or pilot-operated valves should be used to eliminate the influence of backpressure on set pressure.

Select Appropriate Materials

Body materials must match media corrosivity and temperature. Carbon steel is suitable for oil, water, and steam; stainless steel is required for corrosive media. Seat materials directly impact service life: hardfacing with wear-resistant alloys performs reliably under high temperature and pressure, while rubber or PTFE is preferred for low-pressure resilient-seated applications.

Follow Applicable Standards

Safety valve manufacturing and testing should comply with standards such as GB/T 12241 (general requirements), GB/T 12242 (performance test code), and GB/T 12243 (spring-loaded safety valves). In the petrochemical industry, API 520 and API 526 are commonly referenced. When ordering, specify the valve model, nominal size, set pressure, operating temperature, and applicable standard.

Installation and Maintenance

Safety valves must be installed vertically to ensure proper disc movement. The outlet should be unobstructed to avoid backpressure interference. Prior to installation, valves should be tested to verify set pressure and sealing integrity. Regular in-service inspections are essential to prevent spring fatigue or disc sticking.

Accurate selection ensures reliable safety valve performance. Early consultation with qualified manufacturers is strongly recommended to provide optimal overpressure protection for pressure systems.

The main safety valve product names of China Safety Valve Network include: