Here a result of a 50mm Worcester 20K516666TT150 Series Reduced Bore Ball Valve, Stainless Steel Body, Ball & Stem, PTFE Seats, Flanged & Drilled ANSI 150RF, Valve operated Via Actreg ASRS 130 Spring Return Pneumatic Actuator, Fitted With Westlock 3045 switchbox containing 2 x SPDT microswitches with gold plated contacts and Pneumatrol C1518PA00BA I/S Solenoid Valve Complete with 2 X Silencers, Unit Fully Assembled & Tested Air Fail Close