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Self-Acting Thermostatic Air Vent for Steam System Start-Up and Operation
This datasheet covers thermostatic bimetallic air vent valves in WCB for automatic removal of air and non-condensable gases from steam systems during start-up and steady-state operation.
| Parameter | Specification |
|---|---|
| Size Range | DN15 to DN50 (1/2" to 2") |
| Pressure Rating | PN40 / Class 300 / 50 bar max operating |
| Body Material | WCB carbon steel or CF8M (SS316) |
| Thermostatic Element | Bimetallic strip stack, calibrated for specific steam saturation temperature |
| Valve Plug / Seat | SS316 + Stellite 6 overlay |
| Temperature Range | Element calibrated -20°C to +300°C (standard); higher on request |
| Operating Principle | Bimetallic element opens cold, closes at calibrated temperature below steam saturation |
| End Connections | Screwed NPT / BSPT, socket weld, flanged |
| Discharge Capacity | Air: 20 to 500 m³/h depending on size and differential pressure |
| Features | Self-acting, start-up air venting, calibrated bimetallic element, renewable seat |
| Component | Material |
|---|---|
| Body | WCB carbon steel, investment cast, machined seat bore and bimetallic chamber |
| Bonnet | WCB bolted bonnet with bimetallic element retention and adjustment screw |
| Bimetallic Element | Nickel-iron bimetallic strip stack, factory-calibrated for specific closing temperature |
| Valve Plug | SS316 with Stellite 6 overlay on seating face for erosion resistance |
| Seat | Integral WCB with Stellite 6 hard facing; replaceable seat ring optional |
| Stem / Guide | SS316 stem with upper guide bushing for plug centration |
| Spring | SS304 compression spring maintaining plug-to-bimetallic contact |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet joint |
| Test | Requirement |
|---|---|
| Test Standard | ISO 7842 / EN 26948 cold water test |
| Certification | CE, ISO 9001, IBR |
| Standard | Description |
|---|---|
| Design Standard | ISO 6552 / EN 26704 |
The Steam Air Vent Valve -- Thermostatic Bimetallic WCB is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.