4. Valves and valve actuation
  5. With means to increase head and seat contact pressure
  6. Seat pressed to valve
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Wang Xizhong

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Warex Valve GmbH

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Weevers Henri H.

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Weir Do Brasil Ltda.

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Westenberg Martin

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Whaley William L.

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Whitaker Ritchie W.

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Wilkins Ronald D.

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Williams John B.

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Wirzbick Gregory F.

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Worldwide Oilfield Machine, Inc.

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Wrasman Thomas J.

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Wucik, Jr. Joseph A.

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