roto disc product image close up


Position Indicators with visual beacon let you and your control system know the position of the valve.


Standard actuator is a double-acting rack & pinion type. Spring-return, Vane-type and Electric actuators are also available. Maintenance lock-out solutions supplied on upon request.


Product contact surfaces can be grit and electro-polished up to a mirror finish. Food-grade configurations available with all product contact surfaces of either polished 304/316SS or food-grade PTFE (FDA 21 CFR177.1550).


Seat retainer protects seat from exposure to material flow.


Close-coupled (Namur) solenoid valves (12VDC – 240VAC) control the actuator and can cause the valve to fail closed, fail open or fail last. Proportional controllers available (4-20mA, 3-15psi) for throttling and dribble-feeding. Solutions available for Intrinsically Safe, AS-i, Foundation FieldBus, DeviceNet, ProfBus DP and ModBus environments.


Optional spray nozzles for interior wash-down in place. CIP ports for spray balls or spray wands are also available.


ANSI 150# flange drilling (thru holes) is standard. Threaded, DIN PN10 or custom flange drilling is also available.


Shafts are sealed with double O-rings and are bubble-tight. Lip seals are used on many valves to prevent material from migration into the bushings.

Heavy-Duty Spherical Valve


The Roto-Disc® valve has a unique design that slices through almost any sticky, gummy or abrasive substance without leaking, jamming-up or pinching product. The design eliminates hang-up points and the wiping action of the dome prevents material build-up. It is ideal for a wide-range of industries as an alternative to ball-valve, knifegate/slidegate valves and butterfly valves.

roto disc valve close up view

Roto-Disc®, Inc.


Direct-drive system eliminates taper/shear pins both inside and outside the valve. Square shaft ends and dome holes are machined to exacting tolerances and ground by hand to provide a perfect slip-fit that won’t allow the actuator and dome to become decoupled.

Seat replacement is a cinch – just take off the seat retainer and drop in a new seat. No shaft adjustment or alignment, no counter-rotating bushings – NO HASSLE!

Sticky, gummy, abrasive substances, powders, pellets, granules, chips – almost anything that runs through a process line can be handled by this valve.

If you can’t afford to spend time looking for replacements or have your valves out of service for repair, you need a Roto-Disc®. It could end your valve headaches forever!

roto disc interior view diagram fully open

Roto-Disc® totally open:

Material falls unobstructed through the inlet opening. Nothing is in the flow stream to cause product bridging, so you get the full flow capacity of the valve. Notice that the sealing surfaces are protected from direct contact with material.

roto disc interior view diagram partially open

Roto-Disc® closing:

As the valve begins to rotate closed, the dome wipes against the seat, cutting off the flow of product and pushing material above or below the valve instead of wedging it between the dome and seat. The design naturally resists abrasive wear and there are no pinch points or places for material to hang-up.

roto disc interior view diagram closed

Roto-Disc® fully closed:

Closure is clean and the valve is fully seated. The dome and seat form a positive seal that eliminates leakage across the seat. Double O-rings prevent leakage through the stems.

Materials of Construction

Body & Dome:

Stainless Steel (304, 316, Duplex), Hastelloy-C, Inconel, Monel, Carbon Steel (4140, WCB, A36), Ductile Iron, Other alloys upon request

Soft Seats:

Reinforced PTFE (glass fiber, 316SS fiber, carbon fiber), PEEK, Ertalyte, UHMW, Other engineered plastics

Metal Seats:

Stainless Steel (304, 316, Duplex), AR400 Abrasion Resistant Steel, Hastelloy-C, Inconel, Monel, Other alloys upon request

Coatings & Hardfacings:

Electroless Nickel, Stellite, Hard Chrome, Thin-Dense Chrome, Tungsten Carbide, Teflon®/PFA, Others

Pressures Range*:

Full vacuum to 150psig below valve. Full vacuum to one bar above valve

Temperature Range*:

-40°F – 1200°F (-40°C – 650°C).

*Pressure and temperature limits of an individual valve depend on a variety of application conditions and materials of construction of the valve.

roto disc valve with hand wheel operation
roto disc valve close up closed
roto disc thermal regulation product image

Roto-Disc® Valve with Standard Controls & Standard Flange Arrangement

lighter weight roto disc valve diagram blueprint
lighter weight roto disc blue print diagram of solenoid
lighter weight roto disc diagram blue print of valve outlet
roto disc specification table