A safety valve is an automatic pressure relief device that remains normally closed until system pressure exceeds a set limit. It then opens automatically, discharging medium to prevent overpressure accidents. Safety valves are critical protection devices for boilers, pressure vessels, and industrial piping systems.The main safety valve product names of China Safety Valve Network include:F2-250/400 Main Safety Valve,Fan Engine Safety Valve,Freezer-used Safety Valve,Gas Specific Fall Lift Safety Valve,GA49H-DN20 Pulse Safety Valve,High Temperature and Pressure Fall Lift Safety Valve,Hydraulic Safety Valve,Impulse Safety Valve,Impulse Spring Safety Valve,JIS Safety Valve

Classification by Lift Height

Conventional lift (micro-lift) safety valves have an opening height ≤0.05d0 (where d0 is the throat diameter). They suit liquid services with modest discharge requirements.

Full-lift safety valves achieve opening height ≥0.25d0, providing maximum discharge capacity. They are ideal for gas and steam applications requiring rapid pressure relief.

Classification by Structure

Spring-loaded safety valves use spring preload to control set pressure and are the most widely used type. Lever-weight valves employ a weight and lever mechanism, commonly found on small low-pressure boilers. Pilot-operated valves consist of main and pilot valves, suitable for high-pressure systems.

Classification by Body Design

Closed-bonnet safety valves direct discharge through piping to a specific location, essential for toxic, corrosive, or valuable media. Open-bonnet valves discharge directly to atmosphere, typically used for air and steam.

Selection Considerations

For spring-loaded valves, the same pressure class may have multiple spring ranges. When ordering, specify the set pressure; otherwise, the highest spring range will be supplied.

Installation and Maintenance

Install all safety valves vertically for reliable disc movement. Ensure the outlet is unobstructed to prevent backpressure interference. Test valves before installation to verify set pressure and sealing. Perform regular inspections on valves in service to maintain reliability.

Proper selection, installation, and maintenance ensure safety valves provide dependable overpressure protection.

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