The dome valve is the electropneumatic valve that operates through linear cylinder or rotary actuator with a soft sealing, generally called as inflated seal. Seal inflation is done by compressed air. It can operate in full open, full close or position controlled by positioner.
Material can pass through controlled gap of the dome closed position. In the closed position, high pressure air enters in the seal then the seal face expands around dome periphery airtight sealing. This prevents passing of the material and air(gases). The seal is relaxed and the gap is re-established before the dome moves to an open position. It can be used in abrasive, hazardous or toxic application.
Dome valve parts and Material of construction
| Description | Material of Construction |
|---|---|
| Top Plate Insert Ring Inflatable Seal Spigot Piece Gasket Valve Body Dome V-Ring Pivot Shaft Drive Shaft Bearing Cylinder/Actuator Mount Cylinder/Actuator Quick Exhaust Valve Proximity Switch Pressure Switch Pressure Gauge Solenoid Valve |
Mild Steel/Stainless Steel Mild Steel/Stainless Steel Silicon/Viton/EPDM Mild Steel/Stainless Steel Champion Cast Iron/Alloy Cast Iron/Cast Steel Cast Iron/Alloy Cast Iron/Cast Steel Rubber EN-8/EN-24/Stainless Steel EN-8/EN-24/Stainless Steel Gun Metal Mild Steel/Stainless Steel STD STD STD STD STD STD |
- Leak-Proof: The inflatable seat valves ensure leak-proof sealing in continuous operation while operating to isolate a pressure differential.
- Complete Opening: The Dome Valve inflatable seat valve is completely open and does not restrict flow when open. The closing spherical member is open away from the flow of material and is unaffected by media flowing through the valve. When the valve is open there is no restriction to the flow of the material.
- Zero Contact: The inflatable seat is not in contact with the closing member during opening and closing. The closing position is reached only when the inflatable seat engages the closing member reducing the wear.
- High Temperature: Applications upto 380°C can be provided without damaging the inflatable seat elastomer. This achieved by a unique water-cooling process to the spherical component and the elastomer housing.
- High Pressure: Applications up to 20 bar(g) can be provided.
