Double-plate gate valve, shut-off plate, and method for sealing a double-plate gate valve
First Claim
1. Method for sealing a double-plate gate valve (10) using circular shut-off plates, said method comprising the steps of:
- spreading apart shut-off plates (20a, 20b) of the double-plate gate valve via spring elements (25) clamped in between the shut-off plates (20a, 20b);
pressing via the spring elements (25) the shut-off plates (20a, 20b) against respective associated sealing surfaces on a housing (11) of the double-plate gate valve; and
applying a sealing gas pressure to a space between the shut-off plates (20a, 20b), wherein at least one of the two shut-off plates (20a, 20b) is convexly deformed upon the application of the sealing gas pressure.
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Accused Products
Abstract
A double-plate gate valve is provided for fittings of industrial plants wherein the double-plate gate valve comprises a housing having two shut-off plates inside the housing the shut-off plates being displaceable between an open and a closed position. Spring elements, such as disc spring packs, are arranged between the shut-off plates pressing the shut-off plates in the closed position against sealing surfaces arranged on the housing such that the entire sealing force required for sealing is provided by the spring elements. Also provided in stand-alone form is a shut-off plate for use in the double-plate gate valve. A method for sealing the double-plate gate valve using the shut-off plates is also provided.
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Citations
7 Claims
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1. Method for sealing a double-plate gate valve (10) using circular shut-off plates, said method comprising the steps of:
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spreading apart shut-off plates (20a, 20b) of the double-plate gate valve via spring elements (25) clamped in between the shut-off plates (20a, 20b); pressing via the spring elements (25) the shut-off plates (20a, 20b) against respective associated sealing surfaces on a housing (11) of the double-plate gate valve; and applying a sealing gas pressure to a space between the shut-off plates (20a, 20b), wherein at least one of the two shut-off plates (20a, 20b) is convexly deformed upon the application of the sealing gas pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification