Non-contact Rising Stem Ball Valve (RSBV) is designed to avoid issues of trunnion mounted, floating ball and other conventional valve types under the following extreme conditions:
HIGH / LOW TEMPERATURE AND TEMPERATURE FLUCTUATION
HIGH PRESSURE / HIGH DIFFERENTIAL PRESSURE
MEDIA WITH SOLID PARTICLES
FREQUENT SWITCHING
(ESD) EMERGENCY SHUTDOWN / FAST STROKE
Its HIGH PERFORMANCE in extreme conditions is secured by the following characteristics:
SINGLE SEAT DESIGN resulting in no adverse effect from thermal expansion.
METAL TO METAL SEALING. No weak parts (such as springs) are required in order to obtain perfect sealing. Sealing is obtained mechanically - independent on line pressure.
FRICTION-FREE OPENING AND CLOSING. The Rising Stem Ball Valve sealing mechanism is based upon axial movement only, compared to standard Ball, Gate, Plug and butterfly valves having their sealing mechanism based upon shear force, friction and tearing. The Rising Stem Ball Valve sealing is not liable to friction or tearing as there is no contact between ball and seat during rotation of the ball. This friction free quarter turn mechanically energised sealing means no abrasion on the seal and, compared with other types of valves, an exceptional long life with up to zero leakage during the whole life.
SELF-CLEANING sealing surfaces due to high velocity flow during opening and closing.
LINEAR STEM MOVEMENT ONLY resulting in strong and controlled opening and closing „1 inch per 1 second“.
THE SELF-LOCKING OPERATING MECHANISM on all Control Seal valves secures the closing member from rotating due to in-line forces. As a result there is no danger of line slam or shock.
IN-LINE MAINTENANCE AND SERVICE. Top-access for stem packing renewal is possible while the valve is in-line and top of the valve is closed by back seat. TOP ENTRY for easy service and possibility to exchange all internals including seat while the valve is in-line.
APPLICATIONS
Molecular Sieve / LNG Dehydration units / Gas drying
Hydrocracking units / Hydrogen service
Petrochemical - wide range of applications
Hot oil
Steam service
USED AS
Isolation valve
Frequent switching valve
Blow-down valve
General shutdown valve
Emergency shutdown valve
(Abreviations / tag numbers: KV, MOV, BDV, ESD, XV and more)