Control Valves Β· Single-Seated Control Valves
Pneumatic Single Seat Globe Control Valve
The pneumatic single seat globe control valve is the tight-shutoff, actuated execution of the single seated control valve line: one seat and a SS304/SS316/SS316L trim inside a WCB, WC6, WCC, CF8, CF8M, CF3, CF3M or alloy steel body, sealed by V-PTFE, PTFE or graphite gland packing and driven by a multi-spring diaphragm actuator. The benchmark execution covers 1/2" to 12" at Class 150 to 600, PN16 to 64 and JIS 10K to 40K, -17 C to +230 C, with throttling or on-off control and air-to-close or air-to-open action.
Part of the Single-Seated Control Valves family
Last updated: 2026-11
Specifications
| size range | 1/2" to 12" |
|---|---|
| pressure class | Class 150 to Class 600, PN 16 to PN64, JIS 10K to 40K |
| body materials | WCB, WC6, WCC, CF8, CF8M, CF3, CF3M, Alloy Steel |
| trim materials | SS304, SS316, SS316L |
| operation | Throttling Control, On-Off Control |
| operation | Multi-Spring Diaphragm Type |
| temperature range | -17 to +230 C |
| end connection | Flanged, Welded |
| gland packing | V-PTFE, PTFE, Graphite |
| valve action | Air to Close, Air to Open |
Application & selection guidance
Select this execution where tight shutoff matters more than actuating force - the single seat takes the full pressure drop but seals tighter than a balanced double seat. Pick the body casting against the medium, the trim against erosion and temperature inside the -17 to +230 C window, and choose air-to-close for fail-open or air-to-open for fail-closed safety logic.
Frequently asked questions
Why pick a single seat over a balanced double seat trim?
One seat gives a single, verifiable sealing surface - the benchmark page trims it in SS304, SS316 or SS316L - so shutoff is tighter, at the cost of higher unbalanced force that the multi-spring diaphragm actuator must carry.
What ratings and temperatures does the benchmark execution cover?
The benchmark page declares Class 150 to Class 600, PN16 to PN64 and JIS 10K to 40K pressure classes over 1/2" to 12" sizes, with a -17 C to +230 C working temperature on WCB through CF3M and alloy steel bodies.
How is the fail-safe action selected?
The benchmark page lists valve action as air to close or air to open and control mode as throttling or on-off, so the actuator is set to move the stainless-trim plug to the safe state on air failure while the gland packing (V-PTFE, PTFE or graphite) holds the stem seal.
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.
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