The first fault is that the safety valve is leaking. The main reason is
(1) The contact surface between the valve core and the valve seat is not tight;
(2) There is dirt on the contact surface between the valve core and the valve seat;
(3) The stem is deflected.
The second fault is that the safety valve does not open when it reaches the specified pressure.
The main reason is
(1) The valve core is stuck to the valve seat and can be removed by manual exhaust test;
(2) The spring adjustment pressure of the spring type safety valve is too large and should be readjusted;
(3) When the weight of the lever type safety valve moves backwards, the weight should be moved to the original constant pressure position and fastened with the limit screw.
The third fault is that the safety valve is opened when the pressure is not specified.
The main reason is
(1) The spring-type safety valve has insufficient spring adjustment pressure, spring failure or insufficient spring force, and the safety valve should be re-adjusted or replaced;
(2) The lever type safety valve moves forward, and the weight should be moved to the original fixed position and fastened with the limit screw.
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