Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1987-12-18
1989-07-04
Hepperle, Stephen
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
60468, 83617, 83639, 91451, 137467, F16K 1700
Patent
active
048441147
ABSTRACT:
There is disclosed a pressure-drop sensor valve system for controlling the movement of a fluid operated, ram-type device, such as that used to drive a panel punch. The valve-like device includes a main passage having an inlet for pressurized fluid and an outlet connectable to the ram-type device. Disposed intermediate said inlet and outlet is a fluid chamber. A poppet valve is positioned between said fluid chamber and an accumulator chamber in the body of the device. A fluid by-pass is connected to the fluid passage and a reservoir, and is blocked when the poppet valve is closed and opened when said valve is opened. A piston member is provided with its stem in the accumulator chamber opposite the poppet valve, both said member and valve being slightably movable by separate compression springs. A check valve is positioned in an axial passage of the poppet valve. The poppet valve, check valve, and piston operating in response to fluid pressure variations in the fluid passage and the accumulator chamber caused by pressure demands in the operation of the ramp so as to open the by-pass passage immediately after the punch breaks through the panel and vent pump discharge flow to the reservoir to halt further movement of the ram and punch. The poppet valve may be reset either manually or automatically.
REFERENCES:
patent: 2793498 (1957-05-01), Banker
patent: 4189983 (1980-02-01), Fassbender et al.
patent: 4214496 (1980-07-01), Carrieri
patent: 4292990 (1981-10-01), Pareja
patent: 4344451 (1982-08-01), Budecker et al.
patent: 4469125 (1984-09-01), Keeney
Hobson James
Moberg Gary
Contractor Tool and Equipment Textron Inc.
Giangiorgi R. A.
Hepperle Stephen
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