gas valves for pressure testing

P1 pressure of compressed air, the latter from the left end of the input port 10 through the throttle valve, pressure drop P2 output. P2's size can be adjusted regulator spring 2,3. Turn the knob clockwise 1, 2, 3 and diaphragm compression spring 5 8 spool down, increasing standpipe metric fitting the opening of the valve port 10 so that P2 increases. If a counter-clockwise rotation of the knob, opening of the valve port 10 is reduced, P2 decreases.
If the transient elevated P1, P2 will subsequently increases, so the pressure in the diaphragm metric tube fittings chamber 6 increases, the thrust generated by the diaphragm 5 is increased accordingly, the destruction of the balance of the original thrust force, the diaphragm 5 up mobile, 12, a small part of the air exhaust vent through the overflow hole 11. While the diaphragm moves, by the action of the return spring 9, the spool 8 is hydraulic ferrule moved upward, off a small intake valve port 10, to increase the throttling effect, the output pressure decreases until reaching a new equilibrium is attained, the output pressure substantially back to the original value. If you enter the instantaneous pressure drop, the output pressure drop, the diaphragm 5 down, down along the spool 8, the intake valve port 10 open big, throttling effect is reduced, so that the output pressure is basically back to the original value. Rotate the knob counterclockwise 1. 2,3 relax the adjusting spring, the gas acting on the membrane 5 is greater than the thrust force of the regulating spring, the diaphragm upwardly curved, by the action of the return spring to close the intake valve port 10. Then rotating the knob 1, the intake air relief valve body seat 4 and the top 8 is disengaged, then 12, vent hole 11 is discharged through the overflow chamber 6 of the diaphragm compressed air, in a non-output state of the valve .