An improved solenoid actuated, fluid control valve includes a diaphragm which is fluid actuated. Inlet pressure through a restricted orifice into a chamber on one side of the diaphragm acts against the diaphragm and causes closure of the valve,MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE when the solenoid actuated valve in the passage from the chamber to exhaust is operated. When the solenoid or pilot operated exhaust is actuated, then the chamber is depressurized and the fluid flow valve opens. An improved solenoid actuated fluid valve comprising, in combination:
a valve body having a fluid inlet, a fluid outlet,Forged Steel Valves a main fluid passage between the inlet and outlet with a main valve seat in the passage, a flexible diaphragm having a downstream side and an upstream side, said diaphragm mounted in the body for coaction with the valve seat, a portion of one side of the diaphragm in communication with the outlet when the diaphragm is seated and with both the inlet and outlet when not seated,Resilient Seated Gate Valves said diaphragm being flexible at a trip point to effect seating of the diaphragm from the unseated condition; a pressure chamber against the other side of the diaphragm; a first restricted orifice by-pass passage connecting the inlet to the chamber acting on the other side of the diaphragm, said first restricted orifice having a size (Rs), a second restricted orifice by-pass passage connecting the outlet to said chamber, said second restricted orifice having a size (Re), and a check valve which prevents fluid flow to the outlet from the chamber; a fluid pressure control orifice in a control passage from the chamber operating alternatively to exhaust the chamber or pressurize the chamber thereby causing the diaphragm to flex and open the main fluid passage and to alternatively cause the diaphragm to flex and close the main fluid passage, said control orifice having a size, Ro, the ratio Rs ×Re /Ro determining the pressure level in the chamber; and a solenoid actuated valve member in the fluid pressure control passage, said solenid valve member normally open when the solenoid is unactuated and operable to close the control passage when the solenoid is actuated thereby closing the fluid pressure control orifice and simultaneously causing the pressure in the chamber to increase and cause flexing of the diaphragm to close the main fluid passage. Briefly, the present invention comprises an improved solenoid actuated fluid valve comprised of a valve body having a fluid valve passage therethrough from an inlet to an outlet. A valve seat is provided in that passage which cooperates with a flexible diaphragm to control fluid flow. A fluid pressure control chamber acts on the side of the diaphragm opposite the seat. The fluid pressure within that chamber is controlled by a combination of fluid pressure through a restricted orifice from the inlet into the chamber and a solenoid controlled exhaust passage from the chamber. By controlling operation of the exhaust passage with a solenoid mechanism, the pressure in the chamber against the diaphragm is thereby controlled and causes opening or closing of the fluid flow passage through the valve passage. By appropriately sizing restrictors in the various passages leading to the control chamber it is possible to provide a high degree of sensitivity and control of the switching of the fluid valve.
The solenoid actuated control mechanism which operates to control pressure within the chamber is comprised of a thin flexible magnetic plate responsive to current in a solenoid coil. The plate is flexed between a position which opens the exhaust passage from the chamber and a position which closes the exhaust passage from the chamber. The metal plate can be quickly and easily flexed to thereby control the pressure in the chamber and thus control operation of the fluid valve.

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