Piston structure and liquid feeder valve

Details Piston structure and liquid feeder valve Piston structure and liquid feeder valve

2007-02-13

2007-02-13

Jacyna, J. Casimer (Department: 3754)

Valves and valve actuation

Fluid actuated or retarded

Compulsory cut-off after flow period

Reexamination Certificate

active

10491754

ABSTRACT:
Piston structure having a first side and a second side and in a recess (6) formed in an outer portion of the piston (1, 22) a resilient sealing element (5, 11, 21) is placed. The axial width and at least in some places the radial depth of the recess (6) are greater than the cross-sectional diameter of the sealing element (5, 11, 21) which is able to move, owing to the pressure difference of the two sides, between a first and a second position, thereby alternately ensuring a cumulated cross-sectional area at most A1,and a cross-sectional area A0, or a cumulated cross-sectional area at most A2,and a cross-sectional area A0. A1and A2are substantially smaller than A0. The invention further relates to a liquid feeder valve including this piston structure for allowing liquid flow-through in a certain amount or for a period of time from a pressurized source of liquid.

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