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US3305213A
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Valve construction
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US3269695A
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Valve construction
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US3260503A
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Gate valve construction
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US3279747A
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Valve bonnet construction
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US3293342A
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Method for manufacture of valve sealing means
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US3235224A
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Valve seal construction
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US3222028A
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Valve construction
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US3121553A
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Valve construction
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US3069132A
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Valve construction
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US3268204A
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Valve operator
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US3203442A
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Gate valve construction
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US3172638A
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Gate valve body construction
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US3172193A
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Method for the manufacture of valve bodies
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US3158352A
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Clamped gate valve body
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US3089224A
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Method for the manufacture of valve bodies
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US3089678A
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Valve construction
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US3068940A
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Completion valve and hanger assembly
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US3085782A
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Gate valve construction
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US3069131A
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Valve construction
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US3069129A
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Valve construction having fluid pressure and spring bias seals
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