Pneumatic Actuated Globe Valve -- Diaphragm Linear WCB
Modulating Linear Control Valve with Pneumatic Diaphragm Actuator
Document No.SV-DS-ACT-003
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers multi-spring diaphragm pneumatic actuators mounted on T-pattern globe valves for modulating control of steam, water, and process fluids in power, chemical, and general industry.
Technical Specifications
| Parameter | Specification |
|---|
| Valve Size Range | DN15 to DN300 (1/2" to 12") |
| Pressure Rating | PN16 / PN40 / Class 150 / Class 300 |
| Body Material | WCB, WC6, CF8M (SS316), CF8 (SS304) |
| Plug / Seat Material | SS316 / SS316 + Stellite 6 overlay, 13Cr / 410 |
| Actuator Type | Multi-spring diaphragm pneumatic (direct / reverse acting) |
| Actuator Action | Air-to-open (direct) or air-to-close (reverse) |
| Positioner | Smart 4-20 mA HART positioner with auto-tune |
| Cv Range | 0.1 to 1,500 (characterised plug dependent) |
| Leakage Class | ANSI/FCI 70-2 Class IV (standard), Class V or VI (optional) |
| Temperature Range | -29°C to +425°C (WCB with graphite packing) |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1, butt weld |
Materials of Construction
| Component | Material |
|---|
| Body | WCB carbon steel or WC6 Cr-Mo steel for high temperature |
| Bonnet | WCB / WC6 with extended neck for high-temperature packing seal |
| Plug | SS316 with Stellite 6 hard facing for erosion resistance |
| Seat Ring | SS316, integral or replaceable screwed seat |
| Stem | SS316, ground and lapped, guided by upper and lower bushings |
| Actuator Diaphragm | Reinforced neoprene or EPDM fabric-reinforced |
| Packing | Graphite braided rings with anti-extrusion rings for high temperature |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | API 598 / IEC 60534-4 / ANSI/FCI 70-2 |
| Certification | CE, SIL 2 / SIL 3 capable, ATEX on request |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | ASME B16.34 / IEC 60534-2 / ISA S75.08 |
Notes
- Valve sizing must be performed using ISA S75.01 equations with actual process data (Q, P1, P2, ρ, T); submit datasheet for factory sizing.
- Cage-guided trim is recommended for high-pressure-drop service to prevent plug vibration and cavitation damage.
- Noise prediction to IEC 60534-8-3 available; multihole cage or diffusion plate offered for aerodynamic noise reduction.
- Positioner air supply must be clean, dry, and oil-free (ISO 8573-1 Class 3.2.3 minimum).
- Extended bonnet required for service above 250°C to protect actuator diaphragm and packing from radiant heat.
