On-going experience globally enabled the design engineers at Tri-Con to solve the problems being experienced with valves on sulphur units. Typical valve problems on large bore line sizes in such applications range from seizing of the packing to severe seat damage when a valve needs to be operated after long periods of inactivity.
A standard valve may be suitable in an ideal line where there are never any shutdowns or upset conditions because once the valve's body temperature has reached that of the hot sulphur or tail gas passing through it will not allow for any solidification. However, in an upset condition where the valve body cools down, sulphur will solidify in the bearing and shaft areas which will result in seizing of these elements.
Based on experience in these sulphur and petrochemical by-product applications Tri-Con recommends the use of steam jacketed valves as these maintain the critical areas under a constant temperature, thus eliminating any solidification and potential seizure.
The Tri-Con valve is suitable for sulphur and other petrochemical by-products
Tri-Con can supply wafer and double flanged style valves with steam jackets, and steam-traced trim (stem and disc). To provide further protection valves in this series are fitted with bearing protectors. These reduce the ingress of the medium into the critical areas. Coupled with bearing flush purge ports this ensures protection of critical valve areas.
Pertinent design features of this valve series include:
* The triple eccentric valve with true cone-in-cone design eliminates any rubbing of the seats and consequently eliminates any wear and tear which would generate leakage across the seat.
* The self centring temperature compensating disc of this design ensures the optimal position of the laminated seal against the seat. Jamming due to thermal expansion is therefore eliminated.
* The disc is keyed to the shaft and not pinned, providing equal torque transmission and eliminating the danger of pins shearing off.
* The strong disc with its elliptical supporting surface offers the best fixing of the lamination. The zero leakage is achieved by the special machining of the lamination.
* The optimal position of the bearing reduces the bending of the shaft. This guarantees bi-directional tightness under maximum pressure.
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