US 4,846,212 AGranted

Bleed valve assembly for double block and bleed system

AssigneeKeystone International, Inc.

InventorsWilliam B. Scobie, Daniel P. Kusmer

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Abstract

A bleed valve assembly for use in a double block and bleed valve system having first and second block valves comprising a body which is disposed between the block valves which forms a chamber, a flowway having a generally smooth flowway surface defined by the body and partially defining the chamber, the body having a cavity which is in open communication with the chamber and a drain outlet in open communication with the cavity, there being disposed a valve assembly in the cavity which has a rotatable valve element which can be moved between a first open position permitting flow through the drain outlet and a second closed position preventing flow through the drain outlet, the valve assembly having a portion which partially defines the flowway surface when the valve element is in the second or closed position.

Claims20

Dependent claims

A bleed valve assembly for use in a double block and bleed valve system having first and second block valves comprising:

a body adapted to be disposed between said first and second block valves, said body forming a chamber between said first and second block valves and partially defining a flowway through said body, said body further having a cavity and a drain outlet in open communication with said cavity;
a valve assembly disposed in said cavity between said first and second block valves, said valve assembly including a valve element rotatable between a first, open position permitting drainage through said valve assembly and a second, closed position preventing drainage through said valve assembly, said valve element being profiled such that no substantial dead spaces are formed in said flowway by said valve assembly when said valve element is in said second position, a valve element opening being formed between said cavity and said chamber, a seal member being received in said valve element opening and engageable with said valve element to effect a seal between said body and said valve element when said valve element is in said second position;
and
means defining a drain passage through said valve assembly when said valve element is in said first position.

1 more element

Dependencies are inferred from the claim text.