Pneumatic valve disassembly and maintenance

Simple maintenance treatment: pneumatic valve has a longer service life and maintenance free, will depend on several factors: the normal working conditions and maintain a harmonious temperature/pressure ratio, and the reasonable corrosion data. Note:, valve in the closed state, the compression of the body remains fluid, maintenance, remove line pressure and make the valve is in open position before, maintenance, disconnect the power supply or air supply, maintenance, the executing agency with support from a, if packing need to lock, stuffing box, a tiny leakage happened at locking stem nut again, be careful not to lock is too tight, usually lock/circle to circle, reveal that will stop. Second, replace seat seal, and make the valve in a partially open position, flush and remove the body inside and outside the possible dangerous substances. And close the valve, pull down on both sides of the flange connection bolts and nuts, and completely removing the valve from the pipeline. And remove the drive - in a sequence Actuators, bracket, washer, stem nut, shrapnel, wear-resisting, stem packing. , remove the body cover connecting bolts and nuts, separate the bonnet and valve body, and remove the valve cover gasket. , confirm the pneumatic valve in the 'off' position, it can be more easily from the body out, then remove the seat. The body hole jog down the valve stem, until completely removed, and then remove the o-rings and valve stem packing. Note: please carefully operation, to avoid the scratch surface of valve stem and valve body gland sealing parts and reassemble, cleaning and checking the removed parts, replacement of the valve seat, valve cover gasket seals, etc. The assembling, according to remove the opposite order. , with torque, cross lock bolt flange connection. , with torque, locking stem nut. , after the installation of the pneumatic valve actuator, the corresponding input signal through the rotary valve rod drives the valve core to rotate, the valves to open and closed position. , if possible, please in front of the back pack pipeline, valve according to relevant standard of a pressure seal test and performance test.