Pressure regulating valve with differential pressure response
AssigneeUnited Aircraft Products, Inc.
InventorThomas J. Lord
Life of this patent
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Abstract
Valve apparatus including a regulating valve controlling fluid flow through a duct and positionable to produce a regulated downstream pressure from a normally relatively higher upstream pressure. A pilot valve enables a relatively reduced fluid pressure to be used on and in connection with a regulating valve operator. The pilot valve responds to inlet pressure and enables sequential operating steps according to which, in part, the regulating valve moves to a fully open position upon inlet or upstream pressure dropping to a predetermined low value and moves to a fully closed position upon inlet or upstream pressure dropping below the predetermined low value.
Claims8
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, means 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, 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.
Dependencies are inferred from the claim text.