| 摘要 |
A fluid flow control valve comprises a cylindrical tube slidably mounted in a wall between the inlet and outlet valve chambers. One end of the tube is spring urged against the valve seat, so that the spring action plus the pressure against the other end of the tube holds the valve closed. In the open valve position, what acts on the tube is the spring and the difference of the pressures in the two chambers that bear against the tube ends.
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