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Safety valves are classified according to the ratio of the opening height of the valve disc and the flow passage

by:Sino Valves     2021-11-16

According to the ratio of the maximum opening height of the valve disc to the diameter of the flow passage of the safety valve, safety valves are mainly divided into two types: full-lift safety valves and micro-lift safety valves.

① Full-lift safety valve

The opening height of the full-lift safety valve is greater than or equal to 1/4 of the diameter of the flow channel. The discharge area of u200bu200bthe full lift safety valve is the smallest cross-sectional area of u200bu200bthe valve seat throat. The action process is a two-stage effect type, and it must be fully opened with the help of a lifting mechanism. The full-open safety valve is mainly used for gas medium occasions.

② Micro-lift safety valve

The opening height of the micro-lift safety valve is less than 1/4 of the diameter of the flow channel, generally 1/40 to 1/20 of the diameter of the flow channel . The action process is proportional effect type, mainly used in liquid occasions, and sometimes also used in gas occasions with small emissions.

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