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Device for closing an opening of a tank or a tubular conduit

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Dished disc free-disc butterfly valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Double disk gate assembly for block and bleed type valves

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Dual action ball valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Dual action handle for floating disc valve and ball-plug valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent

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Dual lift system

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Reexamination Certificate

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Dual spreading link for gate valves

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Reexamination Certificate

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