Sliding gate valve for use with abrasive materials
The invention is a flow and pressure-sealing valve for use with abrasive solids. The valve embodies special features which provide for long, reliable operating lifetimes in solids-handling service. The valve includes upper and lower transversely slidable gates, contained in separate chambers. The upper gate provides a solids-flow control function, whereas the lower gate provides a pressure-sealing function. The lower gate is supported by means for (a) lifting that gate into sealing engagement with its seat when the gate is in its open and closed positions and (b) lowering the gate out of contact with its seat to permit abrasion-free transit of the gate between its open and closed positions. When closed, the upper gate isolates the lower gate from the solids. Because of this shielding action, the sealing surface of the lower gate is not exposed to solids during transit or when it is being lifted or lowered. The chamber containing the lower gate normally is pressurized slightly, and a sweep gas is directed inwardly across the lower-gate sealing surface during the vertical translation of the gate.
- Assignee:
- Dept. of Energy
- Patent Number(s):
- US 4524796
- OSTI ID:
- 6507065
- Resource Relation:
- Patent File Date: Filed date 24 Sep 1982; Other Information: PAT-APPL-422795
- Country of Publication:
- United States
- Language:
- English
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Sliding-gate valve for use with abrasive materials
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COAL
PNEUMATIC TRANSPORT
PIPELINES
PRESSURE CONTROL
ABRASIVES
ASHES
PARTICULATES
VALVES
CARBONACEOUS MATERIALS
CONTROL
CONTROL EQUIPMENT
ENERGY SOURCES
EQUIPMENT
FLOW REGULATORS
FOSSIL FUELS
FUELS
MATERIALS
PARTICLES
RESIDUES
TRANSPORT
013000* - Coal
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& Peat- Transport
Handling
& Storage