Pressure regulating valve, in particular proportional...

Details Pressure regulating valve, in particular proportional... Pressure regulating valve, in particular proportional...

2006-07-11

2006-07-11

Rivell, John (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S625650

Reexamination Certificate

active

07073533

ABSTRACT:
A pressure regulating valve, in particular a proportional pressure regulating valve, includes a valve body (1) with at least a pump connection (P), a use connection (A) and a tank connection (T). A piston (19), capable of being displaced by a controllable actuating device (29), is guided in the valve body (1). At the periphery of the piston, a recess (45) is formed and defines a peripheral annular gap (47) delimited by the control edges (49, 51) of the piston (19). In the piston (19), a passage (55) provides fluid communication between the front surface of the piston (19), subjected to the use connection (A) pressure, and the rear surface (35) of the piston (19), adjacent to a pressure chamber (37) located behind. The passage (55) of the piston (19) has, in the region proximate to the piston front surface, a restriction zone (57). In a region away from the restriction zone (57) towards the rear of the piston surface (35), an orifice (59) faces the peripheral annular gap (47), and has a second restriction zone (61).

REFERENCES:
patent: 2893428 (1959-07-01), Collins
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patent: 4579145 (1986-04-01), Leiber et al.
patent: 5592972 (1997-01-01), Niethammer
patent: 6269827 (2001-08-01), Potter
patent: 6289921 (2001-09-01), Neuhaus et al.
patent: 6408883 (2002-06-01), Motoki et al.
patent: 0 451 347 (1991-10-01), None
patent: 1 091 131 (2001-04-01), None

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