The difference between the closed and spring safety pneumatic valve is not closed

and the type of the medium in the medium to discharge way spring type safety and pneumatic valve can be divided into totally enclosed pneumatic valve, pneumatic valve and open semi-enclosed safety security three kinds of pneumatic valve, etc.
。 Pneumatic valve closed safety
totally enclosed security pneumatic valve exhaust gas all through the exhaust emissions, medium can't leak out, it is mainly used for medium for toxic, flammable and explosive gas container or pressure piping.
　　. Semi-enclosed safety pneumatic valve
semi-enclosed safety part of exhaust gas of pneumatic valve pneumatic valve outlet exhaust pipes through the security, there is also a part from the air valve cover and pneumatic leak if the hole of the gap between the valve stem, multi-purpose at medium for will not pollute the environment of gas or liquid container.
　　. Not enclosed safe pneumatic valve
don't closed-end security pneumatic valve pneumatic valve cover is open, make the spring chamber and atmosphere are interlinked, it is beneficial to lower the temperature of the spring, mainly is suitable for the medium for steam, and the atmosphere of high temperature gas containers that don't pollute.