Spirax Sarco’s site and laboratory testing has shown their Spira-Trol valves benefit from up to 30% longer stem seal life than most other valves. Hard trip materials and a design that diffuses the discharge from the plug and seat, reducing internal flow velocities to minimise internal erosion, further extends valve life. Thanks to self-aligning, clamp-in-place internals, maintenance of a Spira-Trol valve is quick and easy and needs no specialist tools. A considerable cost saving when compared to valves with screw-in seats that often seize in place, requiring the valve to be removed from the pipeline and incurring a lengthy plant shutdown.