4. Valves and valve actuation
  5. Fluid actuated or retarded
  6. Flexible wall expansible chamber reciprocating valve actuator

Douglas C. Pfantz

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Elastomeric element valve

Valves and valve actuation – With material guide or restrictor – Baffle or zigzag flow restrictor
Patent

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Elastomeric element valve

Fluid handling – Line condition change responsive valves – Direct response valves
Patent

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No-bleed pilot for pressure regulating valve

Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Reexamination Certificate

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Regulator valve with diaphragm support

Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Patent

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Profile ID: LFUS-PAI-P-509419

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