Valve apparatus including a housing and a regulating valve therein, said housing having a pressure fluid inlet and having an outlet for pressure fluid received at said inlet, normally higher pressure fluid being admitted at said inlet and under control of said valve discharging at a relatively lower pressure from said outlet, Cast Gate, Globe, Check Valvesmeans for operating said regulating valve between open and closed positions, means applying continuing unbalanced forces to said operating means, the greater force being applied in a direction to close said valve, means for applying inlet and outlet pressures to said operating means in a manner to adjust said regulating valve in accordance with sensed pressure differences,Reducing Valves said last named means including a pilot valve moving responsively to variations in inlet pressure, said pilot valve responding to inlet pressure decreased to a predetermined low value to vent the outlet pressure applied to said operating means and responding to inlet pressure decreased below said predetermined low value to vent the inlet pressure applied to said operating means. MULTI-FUNCTIONAL WATER PUMP CONTROL VALVEThis invention relates to pressure regulating valves, and in particular to valves installed in an air flowing duct or the like to provide for delivery of a regulated downstream pressure from an upstream pressure supplied in a normally relatively higher range of pressures. The invention is addressed especially to the meeting of an operational requirement that the valve open the duct more fully to flow therethrough as upstream pressure drops, reaching fully open position at a predetermined low upstream pressure below which continued flow is of no value, and that the valve close the duct to flow therethrough should upstream pressure continue to fall and drop below such predetermined low value. Pressure regulating valves are known which attempt to establish and maintain a range of reduced downstream pressures. In no instance of which applicant and those others substantively involved in preparation of this application are aware, does the valve apparatus function in sequential steps involving a reversal of valve movement from fully open to fully closed positions while the pressure responded to is changing in a single direction. The invention is directed to a solution of the above discussed and related problems of the prior art. In the regulating valve art it provides a valve adapted for installation in an air flow duct and adjustable between open and closed positions therein. Piston means drives the valve and takes up positions related to the differences in upstream and downstream pressure. A pilot valve provides for a relatively low pressure operation of the piston means, and, in responding to upstream pressure, produces a sequence of events in which the piston means moves to one extreme position as upstream pressure drops to a predetermined low value and moves in a reverse sense to an opposite extreme position as upstream pressure continues to drop, falling below the predetermined low value and to zero. The purpose of sequencing is to override the normal valve feed back or regulation process to fully open the valve at low inlet pressures to obtain maximum flow, but to close at still lower inlet pressures which are so low as to be of no benefit. A further purpose is to provide a fail safe condition of closing. A mechanism external to the valve apparatus indicates the position of the regulating valve and lends itself to manual operation whereby the valve may be set to control positions independently of fluid pressure conditions. In a feature of the invention, the regulating valve is a butterfly valve combined with a valve operator and a pilot valve control in a manner producing a lightweight, compact valve apparatus particularly suited for duct installation.

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