Gate valves with seat protectors
First Claim
1. A valve comprising:
- an inlet;
an outlet;
wall means for defining a flow path between said inlet and said outlet;
a gate selectively movable between a first gate position and a second gate position, said inlet communicating with said outlet when said gate is in said first gate position;
at least one valve seat, said gate contacting said valve seat when in said second gate position, thereby preventing flow between said inlet and said outlet;
at least one valve seat protector selectively movable between a first seat protector position and a second seat protector position, said valve seat protector covering said valve seat when in said first seat protector position, said valve seat protector being retracted away from said valve seat when in said second seat protector position; and
seat protector moving means for causing said seat protector to move from said first seat protector position to said second seat protector position when said gate is moved from said first gate position to said second gate position and for causing said valve seat protector to move from said second seat protector position to said first seat protector position when said gate is moved from said second gate position to said first gate position, said seat protector moving means comprising a strap attached at one end to said seat protector, the strap passing around a pulley and being attached at its other end to said gate.
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Accused Products
Abstract
A gate valve includes:
(1) an inlet;
(2) an outlet;
(3) wall means for defining a flow path between the inlet and the outlet;
(4) a bonnet wall which defines a bonnet space; and
(5) at least one valve seat.
A gate is selectively movable between a first gate position, in which the gate is retracted away from the valve seat and the inlet communicates with the outlet, and a second gate position, in which the gate contacts the valve seat, thereby preventing flow from the inlet to the outlet, the gate having a seal surface which contacts the valve seat when the gate is in the second gate position. At least one valve seat protector is selectively movable between a first seat protector position, in which the valve seat protector covers the valve seat, and a second seat protector position, in which the valve seat protector is retracted away from the valve seat. The gate is movable between the first and second gate positions and the seat protector is movable between the first and second seat protector positions.
30 Citations
29 Claims
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1. A valve comprising:
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an inlet; an outlet; wall means for defining a flow path between said inlet and said outlet; a gate selectively movable between a first gate position and a second gate position, said inlet communicating with said outlet when said gate is in said first gate position; at least one valve seat, said gate contacting said valve seat when in said second gate position, thereby preventing flow between said inlet and said outlet; at least one valve seat protector selectively movable between a first seat protector position and a second seat protector position, said valve seat protector covering said valve seat when in said first seat protector position, said valve seat protector being retracted away from said valve seat when in said second seat protector position; and seat protector moving means for causing said seat protector to move from said first seat protector position to said second seat protector position when said gate is moved from said first gate position to said second gate position and for causing said valve seat protector to move from said second seat protector position to said first seat protector position when said gate is moved from said second gate position to said first gate position, said seat protector moving means comprising a strap attached at one end to said seat protector, the strap passing around a pulley and being attached at its other end to said gate. - View Dependent Claims (2, 3, 4)
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5. A valve comprising:
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(a) a valve body comprising; (1) an inlet; (2) an outlet; (3) wall means for defining a flow path between said inlet and said outlet; (4) a bonnet wall which defines a bonnet space; (5) a first valve seat and a second valve seat; (b) a gate movable between a first gate position, in which said gate is retracted away from said valve seats and said inlet communicates with said outlet, and a second gate position, in which said gate contacts said valve seats, thereby preventing flow from said inlet to said outlet, said gate having first and second seal surfaces which contact said first and second valve seats, respectively, when said gate is in said second gate position; (c) first and second valve seat protectors selectively movable between a first seat protector position, in which said first and second valve seat protectors cover said first and second valve seats, respectively, and a second seat protector position, in which said first and second valve seat protectors are retracted away from said valve seats, said valve seat protectors including seat protector straps, said first valve seat protector having front and back first seat protector surfaces which are substantially parallel to one another and to said first seal surface of said gate, said second valve seat protector having front and back second seat protector surfaces which are substantially parallel to one another and to said second seal surface of said gate; and (d) means for selectively moving said gate between said first and second gate positions. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A valve comprising:
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(a) a valve body comprising; (1) an inlet; (2) an outlet; (3) wall means for defining a flow path between said inlet and said outlet; (4) a bonnet wall which defines a bonnet space; (5) at least one valve seat; (b) a gate movable between a first gate position, in which said gate is retracted away from said valve seat and said inlet communicates with said outlet, and a second gate position, in which said gate contacts said valve seat, thereby preventing flow from said inlet to said outlet, said gate having a seal surface which contacts said valve seat when said gate is in said second gate position; (c) at least one valve seat protector movable between a first seat protector position, in which said valve seat protector covers said valve seat and a second seat protector position, in which said valve seat protector is retracted away from said valve seat; (d) means for selectively moving said gate between said first and second gate positions; (e) means for selectively moving said seat protector between said first and second seat protector positions, said seat protector moving means including a seat protector lever attached on one end to said seat protector and on the other end to a lever stem, the lever stem being rotatably mounted in said valve body and being rigidly attached to an actuation lever. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification