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US4513765A
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Arrangement on a butterfly valve
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DE2937456A1
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GASKET RING FOR SWING VALVES, ESPECIALLY FOR USE IN CRYOGENIC FLUIDA
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JPS5563059A
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Butterfly valve
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CA1092586A
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Butterfly valve
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DE2848130A1
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Butterfly valve for cryogenic fluids - has resin seal ring strengthened by stainless steel clip between U=shaped legs of section
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GB2033054A
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Butterfly valve
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JPS5372226A
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Butterfly valve using liquid especially containing cooling agent
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US3578288A
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Butterfly valve with a sealing ring having a double swallowtail shape in cross section
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GB1107805A
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Improvements in quick operating valves
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GB843275A
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Improvements relating to valves for controlling the flow of pulp and like suspensions
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CA633813A
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Valve for wood pulp and the like suspensions
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