Classification of safety valves

Time：2022/2/10 22:37:03 Category：TECHNICAL ARTICLE Source： Click：

At present, there are two types of safety valves in mass production: spring type and rod type. In addition, there are impulse safety valve, pilot safety valve, safety switching valve, safety decompression valve, dead weight safety valve, etc. The spring-type safety valve mainly relies on the force of the spring to work. There are closed and non-closed spring-type safety valves. Generally, flammable, explosive or toxic media should be closed, and steam or inert gas can be closed. There are spring-loaded safety valves with and without wrench. The function of the wrench is mainly to check the flexibility of the valve disc, and sometimes it can also be used for manual emergency pressure relief, as shown in Figure 3. The lever type safety valve mainly relies on the force of the lever hammer to work, but the large size of the lever type safety valve often limits the selection range. When the temperature is high, choose a safety valve with a radiator.

The main parameter of the safety valve is the displacement, which is determined by the diameter of the valve seat and the opening height of the valve disc. The slightly open type means that the opening height of the valve disc is 1/40 ~ l/20 of the throat diameter of the valve seat. Full lift means that the opening height of the valve disc is 1/4 of the throat diameter of the valve seat.