What is an Overflow Valve?

The safety relief valve plays a safety role in the system. When the system pressure exceeds the specified value, the safety valve is opened, and a part of the gas in the system is vented to the atmosphere, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not cause an accident due to excessive pressure.

There are two types of safety relief valves: spring-loaded and stem-type. There are also impulse safety valves,

The operating pressure determines the nominal pressure of the safety valve, the operating temperature determines the operating temperature range of the safety valve, the constant pressure value of the calculated safety valve determines the constant pressure range of the spring or lever, and the material and Structure type, and then calculate the relief valve's throat diameter according to the relief valve relief. The following are general rules for selecting a safety valve.

(1) Hot-water boilers generally use non-closed micro-opening safety valves with wrenches.

(2) For steam boilers or steam pipes, generally use non-closed full-open safety valves with wrenches.

(3) Liquid incompressible media such as water are generally used with closed micro-opening safety valves or safety relief valves.

(4) High-pressure feed water generally uses closed full-open safety valves, such as high-pressure feed water heaters and heat exchangers.

(5) Compressible media such as gas are generally closed

1. Keep the valve clean: no scale, no adhesion, no rust, etc.

2. When there is leakage: Do not reduce leakage by increasing the load;

3. It must be regularly inspected and cleaned, ground, tested and adjusted ^[1] .