Vacuum check valve and method of control

Details Vacuum check valve and method of control Vacuum check valve and method of control

1988-11-30

1989-12-12

Nilson, Robert G.

Fluid handling

Processes

137514, 137526, 13753325, 137542, F16K 1506

Patent

active

048860859

ABSTRACT:
A value opening air flow control ring requires the poppet to travel a controlled distance off the poppet seat to obtain substantially unrestricted air flow, the restricted flow occurring during air flow pulsations which acts to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source. The control ring also causes directional air flow past the poppet, particularly in the early part of the valve opening sequence while the restricted flow is occurring, causing a side bias on the poppet which decreases as the poppet moves toward its fully open position, the side bias being substantially eliminated by the time the poppet reaches its fully open position. The side bias action is reversed in the valve closing movement from the fully open position. The side bias further inhibits valve pulsations which might otherwise occur as the valve tends to move from the closed position to the open position and vice versa in response to vacuum source air flow pulsations.

REFERENCES:
patent: 2293799 (1942-08-01), Briscoe

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