Patent ID: 7219695

Claim:
A shut-off valve comprising: a valve body defining a valve chamber therein, said valve body including a first seat and a second valve seat and an outlet port; a coil mounting structure mounted to the valve body and including an internal bore extending completely therethrough; an electromagnetic coil wound on the coil mounting structure; a shaft extending into the internal bore of the coil mounting structure, said shaft including a shaft bore extending therethrough and being in fluid communication with the internal bore of the coil mounting structure at one end and the valve chamber at an opposite end, said shaft including a first sealing member mounted to the shaft proximate to the first valve seat and a second sealing member mounted to the shaft proximate to the second valve seat, said shaft further including a shaft port in fluid communication with the valve chamber on one side of the first sealing member, wherein the end of the shaft bore in fluid communication with the valve chamber is in fluid communication with the valve chamber on an opposite site of the second sealing member, and wherein input pressure applied to the end of the internal bore of the coil mounting structure opposite to the valve body causes the first sealing member to seat against the first valve seat and the second sealing member to be forced away from the second valve seat to provide pressure equalization; and a spring applying a spring bias to the first sealing member to cause the first sealing member to seat against the first valve seat.