Everlasting Valve's Process Valves deliver all the advantages inherent in our exclusive Rotating Disc Valve technology.
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.
Sizes 2” to 18”
Class 150 and 300; ANSI B16.34
|Seats and Discs||Cast Stellite #6; ANSI B16.34; MSS-SP 61 leak test|
|Temperature Range||-20°f to 1500°f|
|Body Material||Carbon Steel, Stainless Steel, Alloys|
|Connections||Raised Face Flanged|
|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.
|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|
FLAT DISC ROTATES WITH EACH CYCLE TO SELF-LAP IN ABRASIVE MEDIA
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.
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.