Pilot actuated override mechanism for holding valve

Details Pilot actuated override mechanism for holding valve Pilot actuated override mechanism for holding valve

1992-03-16

1995-03-28

Michalsky, Gerald A.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

91420, 91447, 137599, F15B 13043

Patent

active

054008166

ABSTRACT:
A holding valve for use in a hydraulic operating system of a machine which is adapted to perform both lifting and digging functions is disclosed. The holding valve includes a conventional poppet assembly for modulating the rate at which hydraulic fluid flows from a hydraulic cylinder when the machine is used for lifting functions. The poppet assembly regulates the speed at which a heavy load can be lowered. The holding valve further includes a pilot actuated piston assembly which is operated only when the machine is used for digging functions. When so actuated, the piston assembly engages the poppet assembly and moves it to a fully opened position. In this fully opened position, the poppet assembly is prevented from modulating the flow rate of hydraulic fluid therethrough, effectively removing the holding valve from the hydraulic circuit. Consequently, hydraulic fluid can flow to and from the digging device without interference from the holding valve.

REFERENCES:
patent: 3274902 (1966-09-01), Kleckner
patent: 3381587 (1968-05-01), Parquet
patent: 4172582 (1979-10-01), Bobnar
patent: 4290447 (1981-09-01), Knutson
patent: 4466336 (1984-08-01), Broome et al.
patent: 4538644 (1985-09-01), Knutson et al.
patent: 4569273 (1986-02-01), Anderson et al.
patent: 4838306 (1989-06-01), Horn et al.
patent: 5081904 (1992-01-01), Horn et al.

Affiliated with

Also associated with

Rating

Pilot actuated override mechanism for holding valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pilot actuated override mechanism for holding valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pilot actuated override mechanism for holding valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2244341