Shutoff-opening device

摘要

A valve mount (22) having two valves removably installed thereon from above as arranged in a direction comprises an inflow channel forming member (30) having a channel in communication with an inlet of the valve disposed at one end thereof, a communication channel forming member (31) having a channel for causing an outlet of the valve at the end to communicate with an inlet of the other valve adjacent thereto, an outflow channel forming member (33) having a channel in communication with an outlet of the other valve, and a subchannel forming member having a channel in communication with an inlet-outlet port formed in the other valve.