Back flow preventing adjustable valve apparatus

Details Back flow preventing adjustable valve apparatus Back flow preventing adjustable valve apparatus

1996-01-22

1998-05-19

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137360, 1376142, F16K 2400, E03C 110

Patent

active

057525420

ABSTRACT:
In a valving assembly, the combination comprising an outer tubular member having a first flow port; an inner member having closure means thereon to close the port in relatively axially advanced position of the inner member, and to open the port in relatively axially retracted position of the inner member; control means to control relative movement of the inner member between the positions; an axially movable check valve positioned about the axis of the inner member to pass fluid flow from the port and to space defined between the members, and to block reverse fluid flow from the space and through the first port in the inner member relatively retracted position; and a second port to pass fluid from the space in relatively retracted position of the inner member, thereby to relieve pressure of the fluid in the space.

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