VRS TOP ENTRY RISING STEM
Corrosion is a gradual loss of material by chemical or physical reaction with the process fluid; depending on concentration, temperature and pressure drop all surfaces exposed to process fluid can be seriously damaged impairing the performance of the valve, unless the correct valve type and materials are selected. The right, conscious and diligent selection of both non-metallic and metallic materials along with their proper handling are very important issues from a safety viewpoint.
There are many difficult applications which are challenging to the valve’s ability to provide acceptable duration and performance, VRS TOP ENTRY RISING STEM are designed to appropriately handle severe service applications, whether such applications are corrosive with acid solutions or have higher cycle frequencies and higher pressure and temperature:
Molecular sieve dehydration
Suction and discharge isolation
The special helix-non-contact stem design ensures low maintenance excellent for frequent cycling, while the ball movement off the seats allows a cleaning action of the ball surface with no friction during opening and closing with a considerable reduced torque, the tiling operation movement before rotating causes high velocity flows around the sealing surface that flush away every foreign material from the seat. It’s a combination of a quarter-turn ball valve with a linear movement of the non-rotating stem where sealing is achieved by the compelling force of the actuator.
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