The safety valve is an important component of the steam boiler and pressure vessel, is also prone to failure of components. Control of boiler and pressure vessel safety valve, safety valve selection, installation, commissioning, operation, repair and maintenance of quality control of the whole process of security monitoring, if a link error occurs, are likely to cause the boiler and pressure vessel accidents.

 
First，action under pressure from the seat of a safety valve is not adjusted

1) safety valve is adjusted properly, ignoring the actual characteristics of the working medium and the influence of temperature adjustment pressures, the need to re-adjust. Otherwise, from the pressure error, not in the normal stresses of debugging actions.

2) Sealing surface due to media contamination or crystallization of adhesion and rust; need to purge relief valve, and in severe need to research the spool, the valve seat.

3) Stem and bushing gap is too small when it is affected by the heat expansion jammed; be appropriate to increase the gap of the stem and the bushing.

4) The adjustment or improper maintenance, spring-loaded safety valve spring contraction tight or tight enough, the rust of the lever safety valve plate too heavy or too light, need to re-adjust the safety valve.

5) Valve channel obstructions such as blind flanges blocked; should be promptly removed the obstacle.

6) Spring to produce a permanent deformation, should replace the spring.

7) Safety valve

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