Automatically operative pumping equipment
Water storage and pumping system
Pump protector apparatus
Vacuum motor switch actuator
Hydropneumatic constant pressure device
ApplicationNo. 319512 filed on 10/07/1994
US Classes:417/38, By liquid pressure sensor137/219, LARNER-JOHNSON TYPE VALVES; I.E., TELESCOPING INTERNAL VALVE IN EXPANDED FLOW LINE SECTION200/81.9R, Flow-responsive type417/43Responsive to change in rate of pump fluid flow
ExaminersPrimary: Bertsch, Richard A.
Assistant: Thai, Tuan V.
Attorney, Agent or Firm
Foreign Patent References
International ClassF04B 049/00
AbstractAn hydraulic actuator of a constant pressure fluidic supply system is disclosed in which a movable shuttle disposed within a generally cylindrical housing forms therewith a plurality of piston and cylinder assemblies. Displacement of the shuttle within the housing is governed substantially by opposing hydrodynamic and hydrostatic forces balanced so as to selectively isolate a pump control pressure switch from system pressure during periods of moderate to high consumption demand and provide communication therewith during periods of low to zero consumption demand. An hydropneumatic tank or a conventional diaphragm tank may be used in combination with the actuator to provide fluidic capacitance to the system. Additional system valving and pressure regulation may be incorporated as desired.