Spool activated lock-out valve for a hydraulic actuator load...

Details Spool activated lock-out valve for a hydraulic actuator load... Spool activated lock-out valve for a hydraulic actuator load...

2005-12-23

2008-08-26

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Systems

Supply and exhaust

C137S596120, C091S447000

Reexamination Certificate

active

07415989

ABSTRACT:
A check valve system controls the flow of fluid between a spool valve and a hydraulic actuator and includes a pilot operated check valve that is controlled by a lock-out valve. The check valve has a poppet that engages and disengages a first valve seat in response to a pressure in a control chamber. The lock-out valve has an inlet connected to the control chamber, an outlet connected to an opening in the bore of the spool valve, and an second valve seat between the inlet and the outlet. A valve member that selectively engages and disengages the second valve seat and spool of the spool valve applies force to the valve member which responds by moving into engagement with the second valve seat. Thus in one position, the spool valve maintains the lock-out valve closed which traps pressure in the control chamber which tend to keep the check valve closed.

REFERENCES:
patent: 2363235 (1944-11-01), Ellinwood
patent: 3125120 (1964-03-01), Hasbany
patent: 3151455 (1964-10-01), Tennis
patent: 3433131 (1969-03-01), Soyland et al.
patent: 3541927 (1970-11-01), Iijima
patent: 3714868 (1973-02-01), Kowalski et al.
patent: 3951162 (1976-04-01), Wilke
patent: 4958553 (1990-09-01), Ueno
patent: 5018935 (1991-05-01), Gage
patent: 5279121 (1994-01-01), Barber
patent: 5579642 (1996-12-01), Wilke et al.
patent: 5715865 (1998-02-01), Wilke
patent: 5832808 (1998-11-01), Ishizaki et al.
patent: 5921279 (1999-07-01), Barber
patent: 6327959 (2001-12-01), Takahashi et al.
patent: 6637461 (2003-10-01), Post
patent: 6895852 (2005-05-01), Pieper

Affiliated with

Also associated with

Rating

Spool activated lock-out valve for a hydraulic actuator load... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spool activated lock-out valve for a hydraulic actuator load..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spool activated lock-out valve for a hydraulic actuator load... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4013626