Safety valves undergo routine maintenance to make sure they always operate flawlessly. In processes where only one single safety valve is installed, the entire plant may have to be shut down for valve maintenance. The idea behind the Leser change-over valve: It enables a second, identical safety valve to be connected to the piping system. Whenever the active valve requires maintenance, the change-over valve allows the standby valve to be activated in its place to ensure continued protection of the plant. To reduce the pressure drop below current typical levels, thereby optimising the flow resistance coefficient, the change-over valves were determined and optimised using CFD simulations.
Leser developed a modular design. More than 50,000 different configurations are possible. On lockable combinations, the change-over valve at the inlet of the safety valve does not have to have the same nominal size as the change-over valve at the outlet side of the safety valve. The change-over from one safety valve to the other works by turning the hand wheel. It is easy to see at any time which safety valve is active.
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