A Better Valve

What makes our Rotating Disc Valve better?

With more than 100 years of quality and performance proven in the field, our self-lapping, self-cleaning Rotating Disc Valve sets the industry standard for exceptional durability, performance and value in shut-off and isolation applications, worldwide.

Self-lapping means it wears in – not out.

Rotation of the disc produces an action that, in the process medium, renews and polishes the metal seating surfaces with each operation. This unique concept causes the Everlasting Valve to wear in with use, while all other valves are busy wearing out.

The self-lapping disc rotates as the center of the applied force and the centroid of friction force move toward alignment. High cycling is beneficial. Scratches that develop on the wide sealing surfaces are polished away as the valve is open and closed. There's no other valve like it.

Principle of Operation

The actuator moves the stem and lever arm a quarter turn, which drives the disc. The entire sealing surface of the disc is constantly in contact with the seat or pad through force exerted by coiled springs. These springs allow the disc to move vertically. This compensates for thermal expansion and contraction of the valve's components, also overcoming the effect of any backpressure for which it was designed, and prevents particles from lodging between the sealing surfaces. Differences in tangential disc to seat friction forces cause the disc to rotate on its seat as the valve cycles, thereby shearing and wiping away any process material that may accumulate.

A tight seal is assured.

The wide seat and disc surfaces are routinely machine lapped during manufacturing within several light bands of flatness. This process creates a seal that is better than industry standards for shut off and isolation valves. Precision lapping and factory cycling of the valve serve to reduce leak rates further.

Rotating Disc valve

Positive Shut-off

Machine lapping of the sealing surfaces at the factory assures tight shut-off. Leak rates are less than industry standards for metal seated valves: ANSI B16.34; MSS-SP61.

A self-cleaning, open-body configuration.

The valve body openness provides space for the product to be freely displaced by the lever arm and disc with each cycle. Fines cannot compact in small open areas and possibly jam components, as is the case with other valve concepts. Each time the valve opens to discharge product, a vortex is caused by the eccentric body to port configuration. The settled media swirls, thereby cleaning the valve's interior.

Bulk Material Valve (BMV)

Shearing Action Clears Sealing Surfaces

The disc or discs are not fixed to the lever arm (applied force), but are free to rotate about the spring-loaded rivet with every valve cycle. The disc and seat ID have sharp edges that serve to shear away deposited media from the sealing surfaces as the valve strokes. No other valve is similar.