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RISING STEM BALL VALVES (RSBV)

RSBV - Rising Stem Ball Valves

Control Seal non-contact Rising Stem Ball Valves have a single-seat non-friction design that is able to operate and has proven an exceptional long life span under extreme conditions.

Size: 1” ~ 36” (DN25 ~ DN900)

Bore: Reduced or Full (Full is piggable)

Pressure: 150# ~ 2500# (PN20 ~ PN420)

Temperature range: -196°C ~ 538°C

Connections: Wide choice on request

Materials: Wide choice on request

Rising Stem Ball Valve

 

Rising Stem Ball Valve operates in any condition or combination of conditions:

HIGH TEMPERATURE FLUCTUATION

HIGH PRESSURE FLUCTUATION

MEDIA WITH SOLID PARTICLES

FREQUENT SWITCHING

(ESD) EMERGENCY SHUTDOWN

 

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 are required in order to obtain perfect sealing.

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. This friction free quarter turn mechanical energised sealing means no abrasion on the seal and, compared with other types of valves, an exceptional long life time.

SELF-CLEANING CLOSURE MEMBERS 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 or service is possible while the valve is in-line and top of the valve is closed by back seat.

 

APPLICATIONS:
Molecular sieve
Gas dehydration and regeneration
Petrochemical
Hot oil
Steam service
Emergency shutdown valve

Control Seal has a unique design of its products, short lead time, competetive pricing and excellent after-sales support.

 

Main competetive advantage of Control Seal design is a unique rotating mechanism, see benefits of the design below:

Fast opening and closing due to a very strong the rotating mechanism.

The valve is maintenance friendly as the rotating mechanism is inside the valve. Furthermore, stemguides and gland packings are outside the pressurized area.

Less fugitive emissions and less stress on gland packing due to linear movement of the stem.

Less moving parts lead to long durability and less spare parts needed.

 

Control Seal valves can be designed to meet exact process conditions. Our valves operate where competing valves fail.

 

CONTROL SEAL SPECIAL CONFIGURATIONS:

Sand and Slurry execution for long durability and smooth operation in extremely dirty environment such as off-shore drilling.

Cryogenic execution. For this special application our Rising Stem Ball Valve is upgraded with an extended bonnet and will be supplied with low temperature certificate and/or testing.

Bellow Seal execution for hazardous service where zero emission is required. Can be supplied with helium leak test.

Double Block and Bleed execution.

 

OPERATION:

Hand Wheel

Gearbox

Electric actuator

Hydraulic actuator

Electrohydraulic actuator

 

Design

API 6D, ASME B16.34

Face to Face dimensions

API 6D, ASME B16.10, B16.47

Flanges

ASME B16.5, B16.25

Fire Safe

ISO 10497, API 6FA, BS 6755

Fugitive Emission

ISO 15848, TÜV, Shell MESC SPE 77-312

Testing

API 598, API6D, ISO 5208

Marking

CE, MSS-SP-25

Topworks

ISO 5210

 

 

 

 

opening closing rsbv 1

1. Closed position

On the closed position, the ball is tightly pressed against the seat by the mechanical wedging action of the stem.

 

opening closing rsbv 2 

2. Opening

As the handwheel is turned counter-clockwise, as flat, sloping surface on the bottom of the rising stem causes the ball to till away from the seat.

 opening closing rsbv 3

3. Rotating

As the stem continues to rise, the interaction of the stem guide and the precision spiral part at the stem causes the ball to begin its friction-free rotation.

 opening closing rsbv 4

4. Opened position

In the full open position, the stem has raised to its limit and the ball is positioned for straight through flow.

 opening closing rsbv 5  

5. Closing

To close the valve, the Hand wheel is turned in Clockwise direction. The stem begins to lower and the ball begins to rotate.

 opening closing rsbv 6

6. Rotating (2)

Continuous turning of the handwheel causes the precision spiral part at the stem to act against stem guide, rotating the ball 90 degrees.

 oepning closing rsbv 7

7. Sealing

Nearing the end of the closing cycle, the ball has rotated full 90 degrees without touching the seat.

 opening closing rsbv 8

8. Closed position (2)

Final turns of the handwheel cause an angled flat surface on the lower stem to mechanically wedge the ball tightly against the seat.