Features and Benefits

The Hemiwedge Cartridge Valve is designed with key features that deliver benefits for your application.  Some of the key features include the following:

  • Mechanical Seal
  • Stationary Core
  • Unique Cartridge Design
  • Quarter-turn Operation

FEATURE: MECHANICAL SEAL

Tapered hemispherical closure member (Hemi) rotates around a stationary core. The Hemi wedges into a seat applying an independent positive load as a result of the taper for a reliable bubble-tight shutoff.

hemi-ball-seat-web.jpg

   BENEFITS:

  • Hemispherical Closure Member Applies Independent Load to Seat
  • Valve will seal at both low and high pressures
  • Resilient Seals or Metal-to-Metal Seats available
  • Zero-leakage (bubble-tight shutoff) resilient seat, Bi-directional sealing
  • ISO 5208 Rate A (Zero Leakage) or Rate B shutoff for metal-to-metal seat
  • Low hydrodynamic torque in high flow
  • Segmented sphere option allows for throttling applications
  • Improved closing reliability in ESD application
  • Suitable for thermal cyclic applications

FEATURE: STATIONARY CORE

The stationary core within the Hemiwedge cartridge valve protects the seals and seating surfaces from media flow, providing greatly increased service life and reliability.

   core-directing-flow.jpg

BENEFITS:

  • Flow is not directed at seats during operation 
  • Service fluid (and entrained particulates) is directed away from sealing surface minimizing erosion of seats
  • Flow is not directed at valve body wall – low erosion of pressure containing components
  • Low turbulence and reduced erosion of valve internals
  • Low hydrodynamic torque
  • High flow coefficient
  • Valve is through conduit - Can pass pigs

FEATURE: UNIQUE CARTRIDGE DESIGN:

All trim components are housed in a single pre-tested cartridge which can be easily replaced without special tools or pulling the valves from the line. Rapid replacement reduces maintenance costs.

                             cartridge-web.jpg

 BENEFITS:

  • Easily Removable/Replaceable Cartridge
  • Ability to easily and quickly inspect valve
  • Easily capable of revising trims for throttling
  • Fewer parts to stock
  • Minimal downtime for valve repair
  • No special tools required for service
  • Easily capable of changing from resilient to metal seats
  • Ability to install a temporary strainer for startup purposes
  • Ability to install a temporary trim for welding valves in line
  • Confidence in making a reliable repair with pre-tested cartridge
  • Significant Reduction in Downtime - Top Entry
  • Weld end valves do not have to be removed and/or reinstalled

FEATURE: QUARTER-TURN OPERATION

The quarter-turn (90°) operation is consistent with industry standards and helps in delivering an overall lower total cost of operation.

BENEFITS:

  • Easy to automate
  • Lower emissions than rising stem designs
  • Easy packing adjustment to stop external leaks
  • Low profile for use in skids and offshore applications
  • Utilizes existing ball valve actuation and sizing principles
  • Faster more reliable closure for ESD applications
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