| 摘要 |
<p>This disclosure relates to a valve including a valve member having: a predetermined surface area on its inlet side exposed to the inlet pressure to produce a force tending to move the valve member to an open position; a larger surface area on its opposite, control side exposed to the inlet pressure to produce a larger force tending to move the valve member to its closed position; a passageway through the valve member; a restrictor orifice in the passageway; and a one-way valve in the passageway permitting fluid flow only from the inlet side to the control side of the valve member, to prevent unintentional opening of the valve member in the event of a drop in the inlet pressure followed by the resumption of the inlet pressure.</p> |
