Powder isolating valve
AssigneeClyde Process Limited
InventorBrian Snowdon
Life of this patent
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Abstract
There is described a powder isolating valve which is capable of sealing valves from powder leakage during transport of powder and/or granular material. The valve comprises a rotatable valve closure member (14) and a pneumatically activated sealing mechanism containing a pair of resiliently deformable structures (18,20) extending around a surface of the rotatable valve closure member when the latter is in its closed position, the pair of resiliently deformable structures being held in a pair of annular recesses (32,34) which also extend around an surface of the rotatable valve closure member in its closed position, wherein the pair of resiliently deformable structures are capable of being pneumatically activated to force a sealing ring (26) against the rotatable valve closure member.
Claims17
An isolating valve for the prevention of powder leakage during transport of powder and/or granular material, the isolating valve comprising:
- a rotatable valve closure member;
- and
- a pneumatically activated sealing mechanism consisting essentially of:
- a pair of rubber O-rings extending around an upper surface of the rotatable valve closure member;
- a pair of annular recesses extending around the upper surface of the rotatable valve closure member;
- a sealing ring held in place by the pair of rubber O-rings;
- and
- a channel for delivering compressed air above the rubber O-rings to force the pair of rubber O-rings down against the sealing ring which
- forces the sealing ring against the rotatable valve closure member to form a seal to prevent leakage of powder and/or granular material,
- wherein the pair of rubber O-rings are captive in the pair of annular recesses and do not move but deform under pneumatic force from the compressed air.
Dependencies are inferred from the claim text.