Sliding-gate valve

Patent · Mon Jan 01 04:00:00 EST 1979

OSTI ID:863452

Usnick, George B ^[1]; Ward, Gene T ^[2]; Blair, Henry O ^[2]; Roberts, James W ^[3]; Warner, Terry N ^[4]

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1. Birmingham, AL
2. Sylacauga, AL
3. Charlotte, NC
4. Wilsonville, AL

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 plate-type 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.

• Research Organization: Catalytic, Inc., Wilsonville, AL (USA)
• DOE Contract Number: EX-76-C-01-2270
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4174728
• OSTI ID: 863452
• Country of Publication: United States
• Language: English

Related Subjects

/137/251/
abrasive
abrasive slurries
accommodate
actuator
adjusting
admitted
annular
annular gap
annular valve
aperture
assembly
assembly comprises
atmosphere
axis
buildup
casing
chambers
channel
circular
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clearance
closed
closes
comprises
containing
cooperatively
coupled
define
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designed
designed especially
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extend
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extends
external
fitted
flow
flow channel
flows
form
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gap
gas
gate
gate valve
gate-to-seat
gate-to-seat-ring
guideway
highly
inflowing
inwardly
long-term
means
minimizing
mounted
normal
novel
opposed
outwardly
passages
plate
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portion
portions
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preferred
preferred form
process
provided
purge
purge gas
reciprocated
reciprocation
register
rings
seal
sealably
sealed
sealed chamber
sealing
sealing surface
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seat
seats
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shielded
slidable-gate
slidably
sliding-gate
sliding-gate valve
slurries
solids
surfaces
swept
therein
tightly
transit
type
valve
valve casing
valve seat
valve seats