Pumps – Expansible chamber type
Patent
1993-07-19
1994-08-09
Sollecito, John M.
Pumps
Expansible chamber type
62292, 417544, 417568, F04B 100
Patent
active
053360656
ABSTRACT:
A manually operated refrigerant recovery device is disclosed that includes a piston/cylinder pump combination, wherein the piston defines opposing fluid chambers in the cylinder. A handle is attached via a connecting rod to the piston. First and second one-way check valves are provided at the pump inlet and outlet to ensure the fluid flows in only one direction through the pump. A pressure relief valve is in fluid communication with the fluid chamber opposite the pump chamber and is continuously manually adjustable between an open position and a closed position. The pressure relief valve is closed upon initial pressurization of the pump to dampen sudden upward movement of the handle and is open during pumping to facilitate manual pumping. In another embodiment, a manually operated refrigerant recovery device is disclosed which includes a piston/cylinder pump combination, wherein the piston defines opposing fluid chambers in the cylinder. First and second one-way check valves are provided at the pump inlet and outlet, wherein the pump outlet is in fluid communication with the pump chamber and the pump inlet is in fluid communication with the fluid chamber opposite the pump chamber. Pressure equalization tubing connects the fluid chambers via a one-way check valve to provide damping against sudden upward movement of the handle.
REFERENCES:
patent: 1705401 (1929-03-01), Grimley
patent: 4698983 (1987-10-01), Hechavarria
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