Fainger Engineering supplies Change Over Valve. Fainger Engineering is an ISO 9001: 2000 certified company. The Change Over Valve allows for easy maintenance work required on the safety valve to be carried out without interrupting operation, by changing over to relevant standby safety valve, which takes over the function of protecting the plant against impermissible overpressure. Change over valve can handle 100% capacity of safety valve. Change over valve can also accommodate one working & one standby safety valve all the time. There is inbuilt interlocking arrangement.