Valves can be divided into the following categories according to their use:
1) Block valve: mainly used to block or connect the medium flow. Such as globe valve, gate valve, ball valve, butterfly valve, diaphragm valve, etc.
2) Check valve: used to prevent the backflow of the medium. Such as fire pump outlet pipe, stable pressure pump outlet pipe, water pump adapter, etc.
3) Regulating valve: mainly used to adjust the pressure, flow and other parameters of the medium. Such as regulating valves, throttle valves and pressure reducing valves.
4) Safety valve: used for system overpressure safety protection, discharging excess media, and preventing pressure from exceeding the specified value. Such as various types of safety valves.
5) Other special valves: such as blowdown valves and vent valves.
We all know that disc springs are very useful in ball valves, but there are many kinds of valves. Let's see which other valves can be used with disc springs.
A. Disc spring for constant pressure valve
The principle of constant pressure valve is that the gas pressure under the disc spring rises, the disc spring upward force is greater than the spring downward reaction force, the disc spring is jacked, the valve port is opened, the gas flow increases, when the pressure continues to increase, the valve port is proportionally opened, so as to maintain constant pressure. The disc spring on the intake valve stem is deformed by the air pressure in the constant pressure chamber to push the valve stem to displace, and the automatic constant pressure is realized after sealing the air intake hole. Disc springs for constant pressure valves can accurately control and regulate pressure.
B. Disc spring for high-pressure safety valve
High pressure safety valve is a valve that automatically opens or closes using liquid pressure and compressibility. Its opening and closing parts are in a normally closed state under the action of external forces. Once the pressure of the medium in the equipment or pipeline rises beyond the specified range value, it automatically opens. By discharging the medium outside the system, it prevents the pressure of the medium in the pipeline or equipment from exceeding the specified range value. In the design of safety valves, disc springs are commonly used as pressure setting elements, which are very important for the accuracy and stability of safety valve setting pressure. In safety valves, disc springs are usually combined in pairs, and large support surface combinations are used as much as possible. This way, the disc spring assembly will be more stable during movement and have better repeatability of reciprocating motion. The disc spring is safe and reliable to use under high temperature and pressure, and has a long service life.
Then introduce a special kind of valve disc spring: valve preload disc spring. It is suitable for: valves that open frequently, valves that operate in motors or starts, critical valves, valves that leak frequently, safety equipment or valves that are difficult to measure, and valves that need to be monitored.
However, in the application of disc springs in valves, attention should also be paid to selecting the correct disc spring material, heat treatment process, and curve design. If a valve preload disc spring with too low pressure is incorrectly selected, after the bolt preload is relaxed by 30%, the minimum preload required for sealing cannot be provided, which is equivalent to not using a disc spring. If a disc spring with excessive pressure is incorrectly selected, it will exceed the elastic limit of the sealing material or cause the valve rod to lock, and the effect is worse than that of not using the disc spring.
Although the disc spring is small, it is very important for every valve. If the spring fails, the valve is bound to fail.
Finally, if you need to choose a disc spring for the valve, welcome to call. SHANGHAI HEGONG DISC SPRING MANUFACTURE CO., LTD. specializes in the production of disc springs. In cooperation with many valve industry leaders, our professional team will customize and design the valve disc springs that are most suitable for your working conditions.
