Common spring loaded safety pneumatic valve failure

in the pneumatic valve is a fluid conveying system control unit, a cut-off, regulation, guide, to prevent the reverse flow, voltage regulator, the leakage of the shunt or overflow, and other functions. Used for fluid flow control system of pneumatic valve, from the most simple as pneumatic valve to the extremely complex control system used in all kinds of pneumatic valves, its quite a wide varieties and specifications.
　　. Leakage
in the device under normal working pressure, pneumatic valve and pneumatic valve seat sealing surface leakage occurred more than allow degree between. The reasons are as follows: with pneumatic pneumatic valve seat valve sealing surface between the dirt. Can use pneumatic valve wrench to ascend will open a few times, the dirt away; The sealing surface damage. Should be used according to the damage degree, grinding or turning after grinding method to repair; Pneumatic valve rod bending, tilt or lever to pivot deflection, pneumatic valve core and the pneumatic disc displacement. Should be repackaging or replacement; Spring elasticity decreased or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure, etc.
　　. Pneumatic valve vibration or frequency jump
is mainly due to the spring stiffness is too big. Should convert the appropriate spring stiffness; Improper adjustment ring, make the back pressure is too high. Should readjust the adjusting ring position; Drain line resistance is too large, cause excessive emissions back pressure. Should reduce the discharge pipe resistance.
　　. To the provisions of the pressure opens the
the cause of this situation is a constant pressure is not allowed. Should readjust the amount of compression spring or the position of heavy hammer; With pneumatic pneumatic valve seat valve sticking. Safe, pneumatic valve should be conducted on a regular basis manual vent or drain test; Leveraged security pneumatic valve lever stuck or heavy hammer has been moved. Should be to adjust heavy hammer position and make the lever movement.
　　. Emissions after pneumatic disc no return
this is the main spring bending pneumatic valve stem, pneumatic valve installation position is not straight or stuck. Should be reassembled.
　　. Exhaust pressure continued to rise after the
this is mainly due to choose the safety of the pneumatic valve displacement xiaoping equipment safety discharge capacity, pneumatic valve should be to choose the appropriate security; Pneumatic valve stem midline deviation or spring rusting, pneumatic valve cannot open due to high, should be reassembled pneumatic valve stem or change the spring; The exhaust pipe section is not enough, should be taken to meet safety discharge area of the exhaust pipe.
　　. Less than stipulated pressure open
mainly constant pressure are not allowed to be; Spring aging elastic decline. Should be appropriate tightening the adjustment screw or replace the spring.