Sliding-gate valve

Patent · Tue Nov 20 04:00:00 EST 1979

OSTI ID:5268905

Usnick, G B; Ward, G T; Blair, H O; Roberts, J W; Warner, T N

This invention is a novel valve of the slidable-gate type. The valve is designed especially for long-term use with highly abrasive slurries. The sealing surfaces of the gate are shielded by the valve seats when the valve is fully open or closed, and the gate-to-seat clearance is swept with an inflowing purge gas while the gate is in transit. A preferred form of the valve includes an annular valve body containing an annular seat assembly defining a flow channel. The seat assembly comprises a first seat ring which is slidably and sealably mounted in the body, and a second seat ring which is tightly fitted in the body. These rings cooperatively define an annular gap which, together with passages in the valve body, forms a guideway extending normal to the channel. A platetype gate is mounted for reciprocation in the guideway between positions where a portion of the plate closes the channel and where a circular aperture in the gate is in register with the channel. The valve casing includes opposed chambers which extend outwardly from the body along the axis of the guideway to accommodate the end portions of the gate. The chambers are sealed from atmosphere; when the gate is in transit, purge gas is admitted to the chambers and flows inwardly through the gate-to-seat-ring, clearance, minimizing buildup of process solids therein. A shaft reciprocated by an external actuator extends into one of the sealed chambers through a shaft seal and is coupled to an end of the gate. Means are provided for adjusting the clearance between the first seat ring and the gate while the valve is in service. 6 claims.

• Assignee: Dept. of Energy
• Patent Number(s): US 4174728
• OSTI ID: 5268905
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420205* -- Engineering-- Transport & Storage Facilities-- (1980-)
ABRASION
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
FREIGHT PIPELINES
PIPELINES
SLURRY PIPELINES
VALVES