| 摘要 |
The pressure reducing element includes an elongated body having an axially-extending, cylindrical bore including three stepped portions of increasing diameter. Pressure is regulated by a stepped cylindrical valve rod having an outer end located exteriorly of the body and a pressure regulating portion normally located inside the bore and including two pressuring regulation sections of increasing diameter. The valve rod is moved axially within the bore to adjust the outlet pressure by rotating a handle on the outer end of a spindle which is connected to the valve rod and threaded into a collar carried by a fixture mounted on the body for relative axial movement. The valve rod is urged toward an adjusted position by a compression spring encircling the exterior of the body with one end restrained against axial movement relative to the body and the other end bearing against a spring retainer carried by the fixture. If the element becomes plugged with foreign particles, the valve rod can be retracted, while in any adjusted position, by pulling on the handle which causes the spring to compress and permit sufficient travel of the valve rod to move the larger pressure regulating section into the next larger bore portion, thereby facilitating flushing of the particles from the element by system pressure.
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