Safety valves serve as the final line of defense in pressure systems, with reliability directly impacting operational safety. Lifecycle management encompasses selection, installation, testing, and maintenance.The main safety valve product names of China Safety Valve Network include:Pressure Safety Valve,Quick Switching Safety Valve,Spring Low Lift Safety Valve,Spring Low Lift High Pressure Safety Valve,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

Selection and Design

Accurate selection requires precise process parameters. Beyond standard pressure, temperature, and medium, consider whether the medium contains solid particles (affecting seat material selection), whether system pulsation exists (impacting spring selection), and discharge backpressure levels (determining the need for balanced-bellows designs). For flammable or toxic media, closed-bonnet safety valves are mandatory, with discharge directed to safe locations. Follow GB/T 12241, API 520, and applicable standards to ensure relief capacity meets maximum process requirements.

Installation and Commissioning

Safety valves must be installed vertically. Inlet piping should be as short and straight as possible, avoiding elbows or reducers that create pressure loss affecting set pressure accuracy. Outlet piping requires adequate support to prevent additional loads on the valve body. When isolation valves are installed, they must be sealed and interlocked to ensure at least one valve remains operational at all times. Commissioning requires set pressure verification using dedicated test equipment; field adjustment of the spring under system pressure is prohibited.

Operation and Maintenance

Common failure modes include leakage, failure to reseat, and set pressure drift. Leakage often results from seat surface damage or debris entrapment, which may be cleared through manual pop testing. According to TSG ZF001, safety valves require testing at least annually. Testing must be performed by qualified facilities with proper certification.

Special Service Conditions

High-temperature applications require valves with cooling fins to prevent spring relaxation. Low-temperature services, such as LNG systems, demand cryogenic-rated materials with extended bonnets to prevent stem seal freezing. For media containing solids, upstream strainers are recommended to protect sealing surfaces from particle damage.

Digital Management

Online monitoring systems using displacement or acoustic emission sensors enable real-time valve status tracking, supporting predictive maintenance programs. Digital records maintain calibration data, actuation history, and failure logs, providing essential data for lifecycle management.

Effective safety valve management extends from design through installation, operation, and maintenance. A systematic approach ensures reliable performance when overpressure events occur.

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