首頁產品資訊 Velan Gate, globe, and check valves Quarter-turn Valves Coker Diverter Valve (Three and Four-Way)

Coker Diverter Valve (Three and Four-Way)

Size Range
NPS 3 - 18 (DN 80 - 450)
Pressure Class
ASME Classes 150 - 900
Standard Connections
Flanged (RTJ, RF)

Features & Benefits

The sturdy one-piece ball and stem provides optimal strength, and is well suited to applications where fouling due to coke fines are a concern. The one-piece design avoids the problems generally associated with the more conventional two-piece ball and stem, which is highly susceptible to solids buildup in the ball-stem joint and a resulting increase in operating torques.Avoids hysteresis and misalignment.
A Lantern ring with steam block and extra deep stuffing box minimizes the risk of leakage occurring through the packing chamber. Live-loading is available on request.
Strong bellows offer a unique seat loading design that maintains the floating seats in constant contact with the ball and ensures a positive seal.
Velan’s unique scraper type seats design scrapes coke buildup from the surface of the ball during each cycle. Seats are hard-faced to ensure a long, trouble-free service life.
Steam purges to bellows and body area ensure the valve cavities are kept free of coke buildup.
The stem coupling is designed to perform three main functions:
Protect against “overtorquing” of the stem.
Protect the actuator components.
Protect against an unintentional switch into bypass (typically applies to four-way switch).

AUTOMATION

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.