| 摘要 |
<p>PURPOSE: To miniaturize a valve and reduce the possibility of mechanical failure, by arranging first and second orifice devices in a passage for limiting a gas flow flowing through the passage to form first and second pressure lowering, in a piston for dividing fluid spaces in up and down streams. CONSTITUTION: All gases are blown off from a storage chamber, and liquid phase fluid enters into a piston passage 24, to penetrate a first orifice 6, thereby increasing the pressure lowering of the orifice 6. The increase of the pressure lowering of the orifice 6 moves piston 4 onto the seat 23 of a poppet 5 to the force of a spring 8, to seal a fluid groove via an automatic bleed valve 34, to prevent the escape of sufficient quantity of liquid. The pressure of the liquid in the lower flow passes through a second orifice 16 to disappear, resulting in the absence of high back pressure on the piston 4. Consequently the piston 4 is placed on the seat 23 of the poppet 5 until the stop of a liquid-operated pump, and the stop of the pump reduces the pressure in the storage chamber to return the spring 8 to the upstream position.</p> |
