Specially designed for Molecular Sieve application it can be used effectively in dirty services. The ball movement off the seats allows a cleaning action of the ball surface thus eliminating the friction during opening/closing actions and allowing for reduced torque/thrust during operation (Non-contact Rising Stem Ball Valves).
DESCRIPTION
The design of the Non-contact Rising Stem Ball Valve (RSBV) avoids issues of trunnion mounted, floating ball and other conventional valve types under the next extreme conditions:
TEMPERATURE FLUCTUATION, EXTREME HIGH OR LOW TEMPERATURES
HIGH PRESSURE, HIGH DIFFERENTIAL PRESSURE
MEDIA WITH SOLID PARTICLES
FREQUENT SWITCHING
(ESD) EMERGENCY SHUTDOWN / FAST STROKE
HIGH PERFORMANCE In Extreme Conditions:
SINGLE SEAT DESIGN:
– No adverse effect from thermal expansion.
– METAL TO METAL SEALING.
– No need for weak parts to obtain perfect sealing.
– Sealing is obtained mechanically.
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. With The Rising Stem Ball Valve sealing there is no friction or tearing as contact between ball and seat during rotation of the ball is not there. This sealing means no marks on the seal and, compared with other types of valves, an exceptional long life with up to zero leakage during its lifespan.
SELF-CLEANING sealing surfaces: 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 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
Top Entry Rising Stem Ball valves are suitable for Molecular sieve dehydration, dryer switching, suction, and discharge isolation, heat transfer, flowlines, Emergency shutdown, etc.
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
(Abbreviations / tag numbers: KV, MOV, BDV, ESD, XV and more)
TECHNICAL DATA
| Design | API 6D, API 600, ASME B16.34, ISO 14313, ISO 10423, ISO 17292 |
| Design pressure | ASME B16.34, API 600 |
| Body wall thickness | ASME B16.34, ASME VIII Div. I, ASME VIII Div. 2, ISO 17292, API 600 |
| Face to Face | API 6D, ASME B16.10 Long pattern |
| Temperature range | -196° to 600°C (-320° to 1112°F) |
| Pressures range | PN20 (ANSI 150) to PN420 (ANSI 2500) |
| Size range | DN50 (2″) to DN900 (36″) |
| End connections | ASME B16.5 ≤ DN600 (24″) Flanged RF, FF, RTJ ASME B16.25 Butt-Weld BW Clamp (HUB) |
STANDARD FEATURES
| Construction | One piece bolted bonnet |
| Port | Reduced bore, full bore or fully piggable. |
| Stem retention | Anti blow-out stem |
| Sealing | Single seated bi-directional, with preferential flow direction, to avoid pressure trapped between the seats. Metal seated with Tungsten or Chrome Carbide coating; Soft seated with thermoplastic polymers (Nylon, Devlon, PEEK, PCTFE), special polymers upon request |
| Leakage rate | ISO 5208 rate A soft seated, rate B, C, D metal seated |
| Operating Description | The movement of the ball tilted from the seat before starting the rotation eliminates the wear of the seat seal and allows for smooth movement and low torque. The same tilting movement when starting the opening allows for a cleaning flow all around ball surface; this flow automatically flushes the ball surface removing eventual dirt particles from the sealing areas |
| Grease injectors | Available on request on both seats and stem |
| Drain / Vent | Drilled and threaded connections for all sizes, Vents for sizes below DN |
| Vent | Drilled and threaded vent connections for sizes ≥ DN150 (6″) < DN150 upon request |
| Lifting points | Included for sizes ≥ DN150 (6″) or on valves of 250 kg min |
| Support feet | Included for sizes ≥ DN150 (6″) or on valves of 250 kg min |
| Stem extension | Available for applications in low/cryogenic temperature applications or for high temperature application |
| Valve operation | Handwheel, Gear box or Actuator with position indicator and locking device |
| Material testing | Pressure containing & controlling parts to EN 10204 3.1 Materials in Sour Service according to NACE MR0175, MR0103, ISO 15156 Non-destructive testing (NDT) to API 6D, ASME B16.34 |
| Valve testing | Hydrostatic & pneumatic testing to API 6D, ASME B16.34, ISO 5208 (other upon request) |
