Ring type backpressure control valves
- Size range(s)
- NPS 14 – 36 (DN 50 – 200)
- Pressure rating
- ASME Classes 150 – 300
- Standard connections
Features and benefits
Patented Velan ring valves are an intrinsically safe design. The ring valve has no seats. It is a throttling valve. As a result, it does not require a mechanical stop in order to avoid full closure and the resulting drum overpressurization.
- Steam purges: Steam purges to bellows and body area ensure the valve cavities are kept free of coke buildup.
- Excellent throttling characteristics: In the “maximum obstruction” position, the valve provides a pressure drop equal to a butterfly valve’s set at 15° open.
The electric, hydraulic or pneumatic actuator is selected in function of coker service. A large torque safety factor ensures the valve will cycle under the most stringent conditions. When selecting actuators, special attention is paid to the coker deck environment.