Matters needing attention of pneumatic valve

Pneumatic valve in the closed state, the body remains low pressure fluid before repair, remove line pressure and make the valve is in open position before the low maintenance, disconnect the power supply or air low maintenance, will perform agencies out of stents) , packing, if need to lock the l stuffing box in a tiny leakage occurs, we must tighten stem nut ( ) 。 L don't lock is too tight, usually lock/circle to circle, reveal that will stop. ) , replace seat and seal. A) , pneumatic valve, remove l makes the valve in a partially open position, flush and remove the body inside and outside the possible dangerous substances. L close the pneumatic valve, pull down on both sides of the flange connection bolts and nuts, and completely removing the valve from the pipeline. L remove the drive - in a sequence Actuator ( ) , connecting bracket ( ) ,,, check washer ( ) , stem nut ( ) Shrapnel, shape ( ) And in the ( ) , wear-resisting, ) , stem packing ( ) Remove the cover body connection bolt (l ) And nut, separate the bonnet and valve body, and remove the valve cover gasket ( ) 。 L confirm valve ( ) In the 'off' position, it can be more easily from the body out, then remove the seat. L by body down hole jog in the stem ( ) Until completely removed, and then remove the o-rings ( ) And under the valve stem packing ( ) Note: please carefully operation, to avoid the scratch surface of valve stem and valve body gland seal part B) Reassemble the l pneumatic valve, pneumatic valve and check the removed parts cleaning, strongly recommend wrapped spare parts to replace the valve seat and valve cover gasket seal l assembly according to remove the reverse order. L with specified torque, cross lock flange bolts ( ) 。 L with specified torque, locking stem nut ( ) L after installing actuators, the corresponding input signal through the rotary valve rod drives the valve core to rotate, the valves to open and closed position. L if possible, please return the pipe before, according to the relevant standard for pressure seal valve testing and performance testing. D, model representation method of pneumatic valve: the valve QS - as before C of the 'S 'is the old way,' S 'on behalf of the plastic seal to pay. Now use the 'F' said. On behalf of the four fluorine or ptfe material