Control Valves Β· Double-Seated Control Valves
Pneumatic Double Seat Control Valve
The pneumatic double seat control valve is the balanced, actuated execution of the double seated control valve line: two seats share the pressure load so the actuator counters far less unbalanced force than a single seat design of the same size. The benchmark execution covers DN20 to DN300 at PN16 to PN100 and Class 150 to 600 for water, oil, steam and gas from -196 C to 450 C, with WCB/LCB/CF8/CF3/CF8M/CF3M bodies, flanged or butt weld connections, and linear, equal-percentage or quick-open flow characteristics.
Part of the Double-Seated Control Valves family
Last updated: 2026-11
Specifications
| size range | DN20 to DN300 |
|---|---|
| pressure class | PN16 to PN100, Class 150 to Class 600 |
| flow characteristics | Linear, Equal percentage, Quick open |
| body materials | WCB, LCB, CF8, CF3, CF8M, CF3M |
| body materials | WCB, WCC, WC6, CF8, CF8M, CF3, CF3M |
| temperature range | -196 to 450 C |
| applicable medium | Water, Oil, Steam, Gas |
| end connection | Flanged, Butt weld |
| position type | Air pressure increase, valve close or opposite |
| body type | Straight through casting globe type |
| spool type | Balanced double seated type |
| flange connection types | FF, RF, MF, RTJ |
| welding ends | SW, BW |
| flange dimension standard | IEC 60534 |
| bonnet types | I: Standard type (-20 to 230 C), II: Radiator type (-45 C high than 230 C occasion), III: Low temperature extended type (-196 to -45 C), IV: Bellow seal type, V: Warm insulation Jacket type |
| packing materials | V type PTFE packing, flex. graphite packing |
| gasket materials | Metal graphite packing |
| actuator types | multi-spring diaphragm actuator, piston type actuator |
| valve plug materials | SS304, SS316, SS316L |
| valve seat materials | SS304, SS316, SS316L |
| sealing ring materials | PTFE |
| stem materials | SS304, SS316, SS316L |
Application & selection guidance
Select this execution where a modulating duty is too large for a single-seat trim to actuate economically - high pressure drops on water, oil, steam and gas lines - and a small leakage allowance is acceptable, since the two-seat balance trades tight shutoff for actuating force. Pick the body casting against the medium and temperature, and confirm the linear, equal-percentage or quick-open characteristic against the loop tuning.
Frequently asked questions
Why choose a double seat trim on a pneumatic control valve?
Two seats split the pressure load, so the unbalanced force on the plug is largely cancelled and a smaller diaphragm actuator modulates the same duty. The benchmark page declares the balanced double seated spool type in a straight-through cast globe body, DN20 to 300 at PN16 to 100 and Class 150 to 600.
What media and temperatures does the benchmark execution cover?
The benchmark page declares water, oil, steam and gas as applicable media with a -196 C to 450 C working window, carried by standard, radiator, low-temperature extended, bellow seal and insulation jacket bonnet options.
What flow characteristics can be specified?
The benchmark page lists linear, equal percentage and quick open characteristics, with air-to-close or air-to-open action selected on the positioner - match the characteristic to the process gain of the loop being controlled.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage β seat compounds age fastest in direct sunlight and freezing conditions.
Request a quote for Pneumatic Double Seat Control Valve
Submit the requirement for this execution here β a quotation-ready inquiry states the parameters listed under the message field; the binding values are confirmed at quotation.
What happens to your details is described in our privacy notice.
Get a quotation for Pneumatic Double Seat Control Valve
Send size, pressure class and materials for a quotation-ready inquiry β answered with documents and terms.
Request a Quote