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US5979488A
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Bleed system
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External unified integral bleed system for valves
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US5542644A
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Plug-valve having a plug assembly with retractible seals that can be removed without leakage
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US5385332A
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Flow stabilized, retractable seal, double-block and bleed plug valve
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Integral bleed system for valve
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Apparatus for sealing a fluid carrying device
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Self supporting plug for a double block and bleed plug valve
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US4929041A
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Cathodoluminescence system for use in a scanning electron microscope including means for controlling optical fiber aperture
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US4662394A
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Tight shut-off valve with flow control element
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Valve operator for a plug-type valve
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US4623119A
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Plug valve
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US4617964A
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Tight shut-off valve with flow control
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GB8507167D0
|
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Tapered plug retracting slip valve
|
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NL8403781A
|
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Stop valve remote control system - has distributor directing power in one of two ways with control switches providing stop-start action
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US4679764A
|
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Automatic valve actuator and control system
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US4491145A
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Toggle gate valve
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