Roto-Flate®
Inflatable Seal Spherical Valve
In a Flash:
- Heavy-duty construction provides bubble-tight sealing against full vacuum and pressures up to 150psig
- Seal is maintained even when the process fluctuates between pressure & vacuum
- No sliding contact against the seal as the valve rotates
- Seal is bidirectional
- Full open port
- Long, low-maintenance service life
Mechanics of Operation
Inflated Seat
Compressed air enters the inflatable seal assembly, inflating the seal against the dome.
Deflated Seat
Compressed air is released, causing the seal to relax and allowing the dome to rotate.
Roto-Flate® Advantage
Roto-Flate® valves feature a bubble-tight sealing system that is ideal for high-pressure and vacuum environments. The positive seal prevents leakage of liquids, gasses or dry material into or out of the valve.
Bubble-tight sealing means your process runs more efficiently because compressors or vacuum pumps won’t be overloaded.
Typical Installation
Lock-Hopper Valves: Two Roto-Flate® valves are placed in series and are opened and closed independently, so pressure or vacuum is contained above or below the assembly.
Automated Sequence Controller (ASC)
The Automated Sequence Controller (ASC) allows the Roto-Flate® to be controlled with just one signal to open and one to close. This unique device, developed exclusively by Roto-Disc®, Inc., makes controlling the Roto-Flate® as easy as any quarter-turn valve while still providing the high performance of a two-stage sealing system.
Bubble-Tight Against Full Vacuum and Pressure Up to 150PSIG
- Heavy-duty construction
- Bidirectional sealing
- No sliding contact between dome and seal
- Full-open port
- Long, low-maintenance service life
Pressures and Temperatures
- Bubble-tight against full vacuum and pressure up to 150psig
- Seal pressure 5-15psi greater than system pressure
- Temperatures up to 475°F, depending on seal material and system pressures. Water cooling available for higher temperatures
- Hot water & steam heating, jacketing and heat-tracing packages available for thermal regulation of valve body and/or dome
Typical Applications
- Pneumatic Conveying
- Tank & Pressure Vessel Discharge
- Vacuum Dryer Inlet & Discharge
- Pump-line Shut-off
- Gravity Shut-off of Abrasives
- Lock-hopper Valves
Materials of Construction
Body, Dome & Retaining Plates:
Stainless Steel (304, 316, Duplex), Hastelloy-C, Inconel, Monel, Carbon Steel (4140, WCB, A36), Other alloys upon request
Seal Material:
EPDM, Heat-Stable Silicon, Viton®- A/B/GF, Viton Extreme ETP, Buna-Nitrile, Neoprene. Some materials available in white.
Coatings & Hardfacings:
Electroless Nickel, Stellite, Hard Chrome, Thin-Dense Chrome, Tungsten Carbide, Teflon®/PFA, Others
Roto-Flate® Valve with Standard Controls & Flange Arrangement
