| 摘要 |
An adjustable slow closing valve assembly includes a valve body having a bore to receive a valve cartridge with inlet and outlet ports communicating with the bore, the valve cartridge having a tubular retainer providing means defining a valve seat and means reciprocably mounting a valve stem with the stem carrying an operating handle at one end and a valve member adjacent the other end to cooperate with the seat. The valve cartridge further includes a thimble-shaped cup defining a cylindrical dash-pot chamber facing the valve seat on the retainer and the valve stem has a plunger sealingly reciprocable within the dash-pot chamber, the chamber being in fluid communication with the inlet port on the side of the plunger facing the valve seat and a resilient umbrella valve carried by the cup places the other side of the plunger in communication with the inlet port, the umbrella valve allowing restricted flow of fluid into the chamber upon plunger movement in one direction and relatively free egress of fluid from the chamber upon reverse plunger movement. Adjustable spring means biases the plunger in the one direction.
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