Measuring and testing – Fluid pressure gauge – Piston
Patent
1992-05-01
1994-07-26
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Piston
73 38, 200 82E, G01L 716, G01L 910
Patent
active
053318560
ABSTRACT:
A pressure indication device comprises a housing including a bore in which is received a slidable piston. The piston has two end faces, one of which is for connection to a source of fluid at higher pressure and the other of which is for connection to a source of fluid at lower pressure. The device produces an indication when the pressure differential reaches a predetermined value. In an inoperative position of the piston, a portion of the upstream face co-operates with the bore to provide a face seal which reduces leakage between the bore and the piston and which also reduces the effective area of the upstream face. In addition, a labyrinth seal is provided between the bore and the piston. When the predetermined pressure is reached, the piston moves, and as it does so, the effective area of the upstream face is increased. This causes increasingly rapid movement of the piston so providing a very positive indication that predetermined pressure has been reached and so overcoming any tendency of the piston to stick or move only very gradually as the predetermined pressure is reached.
REFERENCES:
patent: 3093716 (1963-06-01), Horowitz
patent: 3342959 (1967-09-01), Breunich
patent: 3429291 (1969-02-01), Hoffman
patent: 4130745 (1978-12-01), Hetzer
Pall Corporation
Woodiel Donald O.
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