Pilot switching valve apparatus and a method of switching...

Fluid handling – Processes – Involving pressure control

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C137S625660, C137S907000

Reexamination Certificate

active

07047993

ABSTRACT:
In a valve chest of the pilot switching valve, a positive pressure chamber and a negative pressure chamber are formed on opposite sides of a valve spindle making a reciprocating motion in the valve chest due to repulsion by a return spring, and by connecting a positive pressure source for feeding a positive pilot pressure to the positive pressure chamber, and a negative pressure source for feeding a negative pilot pressure to the negative pressure chamber, the pilot switching valve has the configuration such that displacement of the valve spindle takes place against the urging of the return spring and connection among respective ports in the pilot switching valve can be switched only when pilot pressures from the positive pressure source and the negative pressure source are fed into the positive pressure chamber, and the negative pressure chamber, respectively where a malfunction of a switching valve is prevented.

REFERENCES:
patent: 4416307 (1983-11-01), Detweiler
patent: 63-106966 (1988-05-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Pilot switching valve apparatus and a method of switching... 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 switching valve apparatus and a method of switching..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pilot switching valve apparatus and a method of switching... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3652424

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.