| 摘要 |
The device (200) has a gas regulator (104), a driver (112) of the regulator and a filter holder (110) carrying a filter. Upstream and downstream isolation valves (102, 106) are located in upstream and downstream of the regulator. Four-way valves (210, 216) are adapted to isolate the filter holder and the driver from the isolation valves and connected between pipes (208, 211). A purge valve (215) purges out limited volume of gas between the four-way valves. An actuating unit comprises a lever connected to the four-way valves. An independent claim is also included for a method for limiting volume of gas lost during intervention on a gas transport network. |
