Pilot-operated pressure shut-off valve

Details Pilot-operated pressure shut-off valve Pilot-operated pressure shut-off valve

2007-04-17

2007-04-17

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

C137S115210, C137S115230, C137S491000, C137S492500

Reexamination Certificate

active

10399671

ABSTRACT:
A pilot-operated pressure shut-off valve having a main control piston which, when an upper system limit pressure in the hydraulic system is reached, connects an inlet, via which pressure medium can be fed to a hydraulic system, to an outlet by taking up a first switching position and, when a lower system limit pressure is reached, separates from the outlet by taking up a second switching position. The pressure shut-off valve has a pilot valve arrangement by which the fluidic connection of a control space adjacent to the main control piston can be changed in order to control the main control piston, and which has a valve housing, with a first pilot piston and a second pilot piston accommodated within the first pilot piston for compact construction and capability to adjust the two pilot pistons mechanically completely independently of each other.

REFERENCES:
patent: 3024732 (1962-03-01), Nyman
patent: 3273581 (1966-09-01), McAfee
patent: 3621881 (1971-11-01), Vicari
patent: 4114637 (1978-09-01), Johnson
patent: 6135142 (2000-10-01), Yokota et al.
patent: 670873 (1989-07-01), None
patent: 1043819 (1958-11-01), None
patent: 3401369 (1984-08-01), None
patent: 3401360 (1985-08-01), None
patent: 3608100 (1987-09-01), None
patent: 4112065 (1992-10-01), None
patent: 1207085 (1970-09-01), None
Specification sheet RD 26 411/03.98, Mannesmann Rexroth Jan. 12-Apr. 12, Rexroth Hydraulics.

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