초록 ▼

Pump to supply fluid to at least two circuits in a control system for a production well. Each of the circuits is maintained at different pressures. The pump provides fluid to a plurality of poppets that are opened or closed depending on the positions of a cam surface which controls the position of t

Pump to supply fluid to at least two circuits in a control system for a production well. Each of the circuits is maintained at different pressures. The pump provides fluid to a plurality of poppets that are opened or closed depending on the positions of a cam surface which controls the position of the poppet. A pressure relief valve is used to prohibit fluid from entering a circuit unless the pressure exceeds the pressure of the fluid in the control circuit. The cam surfaces are controlled by a knob rotatable by an operator. By rotating the knob, the poppets can be opened or closed so as to provide fluid sequentially to each of the circuits and pressurize each circuit individually.

대표청구항 ▼

[ I claim:] [12.] Pump to provide fluid to a plurality of hydraulic circuits, each of said circuits being maintained at different hydraulic pressures, said pump comprising a first and a second plunger, a first chamber associated with said first plunger and a second chamber associated with said secon

[ I claim:] [12.] Pump to provide fluid to a plurality of hydraulic circuits, each of said circuits being maintained at different hydraulic pressures, said pump comprising a first and a second plunger, a first chamber associated with said first plunger and a second chamber associated with said second plunger, an inlet port supplying fluid to each of said first and second chambers, a first outlet port supplying fluid to a first one of said plurality of said circuits, a second outlet port supplying fluid to a second one of said plurality of said circuits and one of said first and second outlet ports supplying fluid to a third one of said plurality of said circuits.