Straight moving type pressure reducing valve

Straight moving type relief valve with straight moving type relief valve shown in the diagram of pressure reducing valve (hereinafter referred to as the overflow valve).
Pressure of compressed air for P1, input from left end after valve orifice throttling, pressure drop for P2 output. The size of the P2 can be adjusted by a pressure regulating spring. Turning the knob clockwise, compression and diaphragm valve core down, valve mouth opening of P2 increase. If the knob counterclockwise rotation, the opening of valve port is reduced, the P2 is less.
Transient rise if P1, P2 will then increases, the diaphragm gas chamber pressure increases, thrust produced by the corresponding increase in the diaphragm, the thrust destroy the balance of the original force, make the diaphragm move up, there are a few air flow through the overflow hole, vent discharge. In diaphragm upward at the same time, because of the reset spring, the globe valve core is also moving up, down into the valve, the throttling effect, make the output pressure drop, until reaching a new equilibrium, output pressure basic returned to the original value.
If input instantaneous pressure drops, the output pressure decline, the diaphragm down, valve core down, then inlet valve is open, the throttling effect is reduced, the output pressure is also the basic back to its original value. The knob counterclockwise. Relax the adjusting spring, gas effect of thrust is greater than the pressure regulating spring force on the diaphragm, diaphragm upward curve, reset spring will close the inlet valve function. To rotate the knob again, intake valve and the overflow at the top of the seat will release, compressed air in the diaphragm chamber via the overflow hole, vent discharge, make the valve is in a state with no output.
In a word, the overflow valve is stress through air inlet throttling effect, on the balance of forces on the diaphragm effect and the overflow hole overflow effect of voltage stability; Adjust the spring can make the output pressure changes within a certain scope. Above in order to prevent overflow valve outside a small amount of gas on the surrounding environment pollution, can be used without the overflow electric control valve (that is, normal pressure reducing valve).
After closing pressure reducing valve in front of the gate, open the relief valve gate valve, manufacture downstream of the low pressure environment; Adjusting screw counterclockwise rotation to the on position (relative to the lowest outlet pressure), then close after the pressure reducing valve gate valve; Open the valve slowly in front of the gate valve to fully open; Slowly turn adjusting screw clockwise, the outlet pressure to the pressure needed to (the table after the valve pressure shall prevail).
After they adjust lock nut locking, after open the relief valve gate valve; Such as in adjusting the outlet pressure is higher than the set pressure, must begin from the first step to readjust, namely only from low pressure to high pressure.
The simplest of pressure reducing valve, direct acting type choke valve, with flat diaphragm or bellows. Because it is a separate structure, there is no need to install external sensing line in downstream. It is the smallest in three types of pressure reducing valve, use one of the most economic, designed for low flow rate.