| 摘要 |
A valve assembly comprises: a valve body (305) having a first pressure chamber (309) and a second pressure chamber (311) wherein the pressure of the first pressure chamber (309) is lower than that of the second pressure chamber (311) and the pressure of the second pressure chamber (311) is discharged to the first pressured chamber (309) in response to the change of the pressure of the first pressure chamber(309); a blocking device (301) arranged between the first pressure chamber (309) and the second pressure chamber (311); a valve stem (307) arranged in the valve body (305) one end of the valve stem (305) movably contacting the blocking device (301); and a diaphragm (304) connected to the valve stem (307) and arranged adjacent to or above the first pressure chamber (309). When the pressure of the first pressure chamber (309) changes the diaphragm (304) forces the valve stem (305) to move by sensing the change of the pressure of the first pressure chamber (309). |
