| 摘要 |
A valve assembly is disclosed that includes a main valve, a pilot valve, and means providing fluid communication between the main valve and the pilot valve. The main valve includes an inlet, outlet, and means adapted to selectively open and close fluid flow between the inlet and the outlet. The pilot valve includes a housing having a first port, a second port, and a third port, and a piston disposed within the housing. The piston cooperates with the housing and the means providing fluid communication to selectively establish fluid communication between the first port of the pilot valve and one of the inlet and the outlet of the main valve.
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