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RISING STEM BALL VALVES

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OVERVIEW

Control Seal Non-Contact Rising Stem Ball Valves (RSBV) provide friction-free operation. The RSBV’s design helps eliminate issues often associated with trunnion mounted, floating ball, and other conventional valve types under extreme conditions such as:

      • High and low operating temperatures. Control Seal is suitable for temperature ranges of -196°C to 565°C (-321°F to 1050°F) 
      • Temperature fluctuation
      • High pressure/High differential pressure applications
      • Media containing solids and entrained particles
      • Frequent on/off switching applications
      • Fast stroking and emergency shutdown applications

TECHNICAL SPECIFICATIONS

DESIGN API 6D, ASME B16.34
FACE to FACE 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

APPLICATIONS

Rising Stem Ball valves are typically used in applications such as:

      • Molecular Sieve / LNG Dehydration units / Gas drying
      • Hydrocracking units / Hydrogen service
      • Petrochemical - wide range of applications
      • Hot oil
      • Steam service

FEATURES

HELIXSTEM® Design Features

Control Seal RSBV features a HELIXSTEM® rotating mechanism that eliminates friction between the ball and seat’s sealing surfaces during rotation. The stem’s linear movement is transferred into two ball movement stages, causing it to tilt and then rotate. Due to the HELIXSTEM® design, the linear stem movement enables fast opening and closing, and it also minimizes the stress on the packing rings (no rotation). Features include:

      • Quick opening and closing due to a robust rotating mechanism.
      • The valve is maintenance friendly as the rotating mechanism is inside the valve. Stem guides and gland packing is outside the pressurized area.
      • Low fugitive emissions - standard packing design meets ISO 15848-1, Class AH  
      • Less stress on the gland packing due to only a linear movement of the stem, compared to other designs that both rise and rotate through the packing. 
      • Fewer moving parts, extending the life and reducing the number of spare parts needed. 
      • There is no helical stem groove, resulting in less wear on the stem guides than conventional helical groove stem designs.
      • Mechanically energized sealing, no springs required to obtain a seal 

Metal to Metal Sealing

Control Seal HELIXSTEM® RSBV has metal to metal sealing. The metal to metal sealing provides 100% shut-off without the need for Teflon or any other soft material inserts, increasing the longevity of the valve, especially in applications with entrained particles.

Control Seal High Performance rising stem ball valves are fully bi-directional to the following leak rates:

      • From the preferred flow direction @ 100% rated pressure class: Zero leakage
      • From the reverse flow direction @ ≤ 50% rated pressure class: Zero leakage
      • From the reverse flow direction @ > 50% rated pressure class: Tight Shut-off – allowable leakage class to API 598 or API6D class D for metal seated valves.
      • From the reverse flow direction @ > 50% rated pressure class: zero leakage can be met – case by case on special request and only after Engineering’s approval.
      • Single-seat design does not require a thermal relief protection system

HOW IT WORKS

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CONTROL SEAL PNEUMATIC ACTUATORS

Control Seal pneumatic actuators are piston-type double-acting actuators with a control panel including limit switches, solenoid valves, and other accessories.

No external tie rods: frequently, the double-acting piston actuators supplied with RSBVs have external tie rods that, when exposed to the environment, can corrode over time, potentially resulting in severe actuator damage and leakage. Control Seal’s double-acting piston actuators do not require any external tie rods.

Non-sticking design: commonly, rubber seals are used as the main seals in piston actuators. These may stick to the cylinder wall during a long standstill, causing fatal actuator leakage. Control seal solved this issue by using special non-stick Teflon reinforced seals. Moreover, all the internals are nickel plated instead of commonly used chrome plating to optimize the unique seal design benefits and ensure that the actuator performs seamlessly after long periods of inactivity.

Integrated Hydraulic Dampener: for smooth actuator operations. Control Seal’s piston actuators have an integrated hydraulic dampener system located on top of the actuator (Non-Intrusive) and are a closed-loop system with an external accumulator.

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