Process Valves

Everlasting Valve's Process Valves deliver all the advantages inherent in our exclusive Rotating Disc Valve technology.

Proven to seal better with wear, these uniquely superior, high-performance valves have become the industry standard.

Self-lapping and self-cleaning, our Process Valves offer the longest service life, reduced maintenance costs and downtime, and the assurance of a tight shut-off. Whatever your industry or application, Everlasting Valve's Process Valves can meet all your requirements while helping you increase production and profit. 

Everlasting Valve's Process Valves are used all over the world for reactor loading, lockhoppers, pneumatic conveying systems, vessel discharge, and slurry applications. Features include: 1- and 2-way-off; manual; pneumatic, hydraulic, electric actuators; construction of carbon, stainless steels and other alloys.

Applications include: petroleum refineries catalysts, chemical plant reactor loading, pneumatic conveying, inorganic chemicals, and line diverters. If you're repairing or replacing an installed valve more than once a year, it's time to switch to Everlasting Valve for a solution that will look great on your bottom line.

Process Valve Specifications

Sizes ½” to 18”

Class 150 and 300; ANSI B16.34

Class 150 & 300 Process Valve Dimensional Drawings

Seats and Discs Cast Stellite #6; ANSI B16.34; MSS-SP 61 leak test
Temperature Range -50°f to 1500°f
Body Material Carbon Steel, Stainless Steel, Alloys
Connections Raised Face Flanged, Buttweld, Flangless
Operators Lever, Handwheel, Air Cylinder, Linear, Hydraulic, Electric
Packing Grafoil, Teflon or Kevlar
Accessories Limit switches, Solenoid, Fail Safe (air reservoir type)

Point design, valves built to meet application requirements through 1500°f, and 10,000 psig.


  • ½” (12mm) through 18” (450mm)


  • ANSI Class 150 through 2500
  • Vacuum to 10,000 psig


  • -50°F (-46°C) to +1500°F (+815°C)


  • Stellite #6
  • 440 Stainless Steel
  • Tungsten Carbide


  • Carbon or Stainless Steel
  • Hasteloys
  • Inconels
  • Duplex SS, F-255
  • Your Choice

End Connections

  • Flanged
  • Buttweld
  • Flangeless


  • Level, Manual
  • Hand Wheel, Manual
  • Air Cylinder
  • Hydraulic Cylinder
  • Electric

Our Process Valves Solve Your Problems

Problem Common Valve Weaknesses Everlasting Solution Result
Seats wear out Sealing surfaces always meet at the same point (1 to 4) Rotating disc/self-lapping Seats wear in, seal improves with use
Leak rate limits exceeded soon after installation Tight shut-off only at time of installation (1 to 4) Rotating disc/self-lapping metal to metal seats Tight shut-off is maintained long after installation
Media build-up, drags across seats Ineffective seat cleaning (1 to 4) Sharp edge, shearing disc against flat metal seat Media build-up sheared from sealing surfaces
Flow causes erosion across seating surfaces Narrow seat band in line with flow (1,2,3) Wide seat band perpendicular to flow Erosion in flow path does not affect sealing ability
Loss of product through packing gland or top seal Stem scores packaging or vulnerable "O" ring (1 to 4) Spring loaded packing and non-rising rotating stem Reduced maintenance hours, efficient operation
Thermal lock-up Intolerance to different expansion rates (1 to 4) Disc drive to disc is spring loaded Constant yield to thermal stress and shock
Excessive pressure drop and reduced flow Flow path restricted when valve is open (1,2,3) Full port flow No obstruction to flow, downsizing possible
(1) Ball Valve (reduced port) (2) Plug Valve (3) Butterfly Valve (4) Gate Valve


1=Initial Leak Test (NEW VALVE)

2=Leak Test after 25,000 cycles in Dry Coarse Limestone

3=Leak Test after additional 8,582 cycles

with 25-35 wt. % Limestone Slurry.

Department of Energy Technology Center Graph

The displayed graph was developed at the Morgantown Energy Technology Center while determining a state-of-the-art valve for lock-hopper service for the Department of Energy Clean Coals Technology program. Everlasting Valve was selected as the best from all the available valve types tested. The criteria were that after 25,000 cycles the valve could not leak more than 18 SCFM of air. When new, the Everlasting Valve (metal seated) leaked 5 SCFM; after 25,000 cycles in dry limestone the valve leaked 3 SCFM. The same valve was then put in a limestone slurry cycling 8,500 additional times for a total of 33,500 cycles with 1 SCFM final leak rate. The diminished leak rate is a direct result of the flat rotating disc self-lapping characteristic. Refer to the complete report to see photos of the tested valve and how the media swirls in the eccentric body to promote self-cleaning.

Learn more about the unique features of Everlasting Valve's self-lapping Rotating Disc Valve.

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