Pilot relay valve including means to control flow through a bala

Details Pilot relay valve including means to control flow through a bala Pilot relay valve including means to control flow through a bala

1996-05-21

1997-09-16

Michalsky, Gerald A.

Fluid handling

Systems

Sequentially closing and opening alternately seating flow...

303 40, F15B 13042

Patent

active

056669950

ABSTRACT:
A pilot operated relay valve (10) for an air pressure braking system includes a relay piston (16) which is responsive to the pressure at a control port (20) to open the valve (10) so that it's inlet port (38) is in free communication with it's outlet port (24). The relay piston (16) includes a balance orifice (26) which permits the outlet port (24) to communicate with the control port (20) to equalized or balance the pressure differential therebetween. A shut off valve arrangement (80,82) or a check value (90 or 92) is provided to shutoff or control flow through the balance orifice during rapid release modulation of the pressure signal for braking applied to the control port (20).

REFERENCES:
patent: 4181367 (1980-01-01), Herring
patent: 4620567 (1986-11-01), Kurtz
patent: 5261458 (1993-11-01), Johnson et al.

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