| 摘要 |
A pressure operated valve includes an inlet and an outlet connected by a main valve having a valve diaphragm member that communicates with an operating pressure chamber. A pilot valve inlet port and a pilot valve outlet port also communicate with the operating pressure chamber. The inlet port is configured in the form of four circular slits of 0.004 to 0.007 inches width. The slits are formed by four pins of a pilot valve insert which fit into four bores in a valve body. Each pin has a ridge on its surface parallel to the pin axis, which pin locates and spaces the pin in the bore to form the slit. The slits are located flush with wall of the main inlet so that water rushing through the inlet washes particles off the slit. The pilot valve outlet port is sealed by an armature comprising a ferromagnetic sleeve and a flexible rubber core. A groove in the core receives the end of a lever which seals the pilot valve inlet port whenever the pilot valve outlet port is open and vice versa.
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