Control Seal’s Non Contact Rising Stem ball valves are single seat non friction design, this valve was designed for frequent switching and fluctuating temperature services, The Control Seal design is also recommended for emergency shut down and blow down service, Control Seal has also developed a Non Contact rising stem ball valve for sand slurry design with a sand content of +/- 50%. For the actual benefits and features see below.

100% FRICTION FREE

An important aspect of the life time of a valve is the sealing mechanism. Almost all valves, like standard Ball, Gate, Plug and butterfly valves have their sealing mechanism based upon shear force, friction and tearing. The Rising Stem Ball Valve sealing mechanism is based upon axial movement only. The sealing is not liable to friction or tearing. This friction free quarter turn mechanical energized sealing means no abrasion on the seal and, compared with other types of valves an exceptional long life time.

STEM DESIGN

The stem of the Control Seal Rising Stem Ball Valve makes only a small axial movement when opening or closing. The stem is always balanced. No stem rotation occurs in combination with axial movement when opening or closing.

STEM PACKING

The stem packing of the Control Seal Rising Stem Ball Valve can be adjusted while the valve is in service. All valves are executed with a back seat.

IN-LINE MAINTENANCE AND SERVICE

As the Control Seal valve is designed for easy and low cost maintenance, top-access is possible while the valve is in-line.

NON-SLAM

The self-locking operating mechanism on all Control Seal valves provides that the closing member can not rotate due to in line forces. Therefore there is no danger of line slam or shock.

FIRE SAFE

The Control Seal valves have been Fire Safe tested by independent inspection agencies and has passed the tests to BS 6755 part 2 and API 6FA successfully (less than 30% of the allowable leak rate).

OPERATIONS

Control Seal valves are easy to operate, no special actuators are required. For remote operation all kinds of actuators can be installed such as electric, pneumatic and hydraulic.

ADVANTAGES OF THE CONTROL SEAL DESIGN, A NEW TWIST TO AN OLD DESIGN

• Friction-free opening and closing, increasing the lifetime of the valve.

• Single seat design, no thermal expansion problems.

• Corrosion and wear resistant materials are used on the closure members.

• Self-cleaning closure members, due to high velocity-flow during opening and closing.

• Top-entry design for in-line inspection and maintenance.

• Adjustable stem packing while the valve is in service.

• All valves are executed with a back seat, which gives possibility to renew stem packing under pressure.

• Mechanically energized sealing, no springs or other weak devices are required to obtain the seat sealing.

• Non-lubricated seal.

• Pressure independent sealing.

• Stem moves only UP or DOWN, no rotation.