| 摘要 |
Provided is a pressure-regulating valve for gas, which, even in a high pressure fuel gas environment, is capable of adjusting the secondary pressure of said environment to a target pressure with greater accuracy, and which can also prevent the leakage of fuel gas to the atmosphere. An electromagnetic pressure-regulating valve (1) is provided with a valve body (14), and adjusts a secondary pressure (p2) to a target pressure by moving the valve body (14) by means of an electromagnetic proportional solenoid (27) and adjusting the opening degree of a valve passage (13). A pressure feedback chamber (24) is formed in a housing (12), and a diaphragm seal (19) is provided in the valve body (14). The diaphragm seal (19) receives the secondary pressure (p2) of the pressure feedback chamber (24), and moves the valve body (14) to a closed position. A bearing member (18) is provided between the valve body (14) and the housing (12), a high pressure seal member (20) is provided in the same gap, further to the valve passage (13) side than the bearing member (18), and a low pressure seal member (21) is provided further toward the bearing member (18) side than the high pressure seal member (20). A buffer chamber (22), which is connected to a secondary port (12c), is formed between the two seal members (20, 21). |
