Signal gate valves, butterfly valves are often used to signal  applied to automatic water spray fire pipeline system, To monitor  water supply lines, can remote indicating valve opening. Rising  stem valves type and the accompanying opening indicator gate valves are often used in fire fighting system, if Gate valves installation position from the ground high, general use of rising stem valves, can obviously refers to And the valve opening, if installed lower position. Attached is need opening indicator gate valves.