Can butterfly valves open by themselves from water pressure?
In a proposed fire services development for an aircraft hanger, we plan to install automatic oscillating foam monitors (nozzles) inside the building. We propose to turn on the water supply with remote actuated butterfly valves (butterfly valves with a quarter turn hydraulic rotary actuator). The building operator has a similar system in another hangar & advises he does not like this system because in the past, one of the butterfly valves opened by itself (after leaking first) and the nozzle went into full discharge. These are very big nozzles and are a safety hazard if they discharge when they are not supposed to.
Can butterfly valves fail in this way and what are the alternatives?