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US3572360A
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Pneumatic controller
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US3543046A
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Capacitance-measuring techniques
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US3580288A
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Flow control device including a pressure-balanced single-seated valve plug
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US3540690A
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Valve construction
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US3542052A
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Relief monitor for gas service
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US3565095A
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Automatic switch-over system
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GB1236632A
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Valve plug with pressure relief groove
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US3542063A
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Filler valve
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US3485256A
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Electrohydraulic actuator
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US3521667A
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Control valve
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US3506242A
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Valve with compressible seal means
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US3456916A
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Ball valve assembly
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US3446477A
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Ball valve construction
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US3456669A
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Piezoelectric transducer
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US3485476A
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Butterfly valve
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US3389718A
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High and low pressure wellhead shut-in valve
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US3396793A
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Gas well dewatering controller
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US3456674A
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In-line flow,pilot-operated high-pressure gas regulator
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US3428080A
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Flow control device
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US3413997A
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Pneumatic relay
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