Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1996-09-16
1997-04-08
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
91 31, 138 45, 251 63, 251122, 405 52, F16K 31122, F16K 4700
Patent
active
056180225
ABSTRACT:
The Variable Orifice Valve is disclosed and the preferred embodiment of a hydraulically acruated.sub.-- flow control device that permits the calibrated throttling of water used in a Artificial Storage and Recovery (ASR), Dedicated Recharge, Injection, Salt Water Barrier Wells used in aquifer storage.sub.-- or utilized in other industries where fluid flow control is required and desired. Aquifer storage of treated drinking water is the placement of water in aquifers during periods of surplus water for recovery of the water during peak demands or forming a barrier to protect a fresh water aquifer. This invention, when installed in a recharge well, is a device installed below the static water level and at or near the bottom of the drop pipe and near the top of the well screen. The size of the orifice and the liquid flow is varied by the axial positioning or adjustment of a double acting hydraulic actuator connected to valve piston. The axial position of the valve piston is controlled by a double acting hydraulic actuator completed through small stainless steel tubes to a hydraulic flow control valve and a hydraulic pump. The flow is monitored by using a flow meter and a pressure gage in the hydraulic passageway. The desired flow is set by adjusting the Variable Orifice Valve hydraulically while monitoring the flow. The operator may adjust the flow of water to any increment within the range of the valve.
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