Classification according to the principle of safety valve

      According to the principle of action

     According to the classification of principle, can be divided into directacting safety valve and non direct acting safety valve.

     1.Direct acting safety valve

Direct acting safety valve is a direct role in the working medium isopened, which relies on the action of medium pressure loading mechanism to overcome the flap valve

     The mechanical load, the valve opening. This valve has the advantages of simple structure, fast, reliable. But because depends on the structural loading, the load is limited, can not be used forhigh pressure, large caliber occasions.

       2.Non direct acting safety valve

      This type of safety valve can be divided into safety valve pilot type safety valve, power assisted device.

Pilot type safety valve is to rely on the media discharged from the pilot valve to drive or control. While the pilot valve itself is a direct acting safety valve, and sometimes also used other forms of valve.Pilot type safety valve for high pressure, large caliber occasions.

Universal-joint

      The main valve pilot operated safety valve can also be designed torely on the working medium to seal form, or can be appliedmechanical load than the direct acting safety valve on the valve flapis much more, which has a good sealing performance. At the same time, it moves very little influenced by back pressure. The disadvantage of this safety valve is its reliability with the main valve and pilot valve, the action as a direct acting safety valve that rapid,reliable, and more complex structure.

      Safety valve with a power assist device with a power assisting device, normally open pressure below the case of compulsorysafety valve. This safety valve for opening pressure is very close to the working pressure of the occasion, or need regular open safety valve to be examined or blowing adhesion, freezing medium. At the same time, also provides a forced open the safety valve in case of emergency measures.

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