| 摘要 |
A three-way valve, having (1) a unitary balanced plug, (2) a pair of stacked cages each having an inverted cone-shaped end for engaging separate wedge-shaped ring seals to move them outwardly and into sealing contact with the valve body and (3) a unique ring member to apply a biasing force on the cage to permit the caged parts to expand without becoming distorted when the temperature of the fluid passing through the valve is increased or decreased and to also maintain the ring seals in fluidtight sealing contact with the valve body before, during and after the changes in temperature of the fluid.
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