Float Steam Trap -- Ball Float Type Carbon Steel 600 PSI
Continuous Modulating Condensate Drainage for Process Steam Systems
Document No.SV-DS-STE-002
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers ball float steam traps in carbon steel for continuous modulating condensate drainage from process heat exchangers, steam mains, and tracing lines rated to 600 PSI.
Technical Specifications
| Parameter | Specification |
|---|
| Trap Size Range | DN15 to DN50 (1/2" to 2") |
| Pressure Rating | PN25 / PN40 / Class 300 / 600 PSI max operating |
| Body Material | WCB carbon steel or CF8M (SS316) |
| Float Material | SS304 thin-walled float with leak-test certification |
| Valve / Seat Material | SS316 with Stellite 6 or 13Cr hard-faced seat |
| Air Vent | Thermostatic bimetallic air vent or balanced-pressure thermostatic capsule |
| Maximum Operating Pressure | 42 bar g (600 PSI) |
| Maximum Operating Temperature | +425°C (saturated steam) |
| Capacity | 300 kg/h to 3,000 kg/h depending on size and differential pressure |
| End Connections | Screwed NPT / BSPT, socket weld, flanged |
| Discharge | Modulating continuous discharge proportional to condensate load |
| Back Pressure Tolerance | Up to 80% of inlet pressure |
Materials of Construction
| Component | Material |
|---|
| Body | WCB carbon steel, sand cast or investment cast, machined seat and float chamber |
| Cover | WCB bolted cover with spiral-wound gasket |
| Float | SS304 thin-walled welded float, 100% helium leak tested before assembly |
| Valve Plug | SS316 with Stellite 6 overlay, guided by upper and lower bearings |
| Seat | Integral SS316 with Stellite 6; replaceable seat ring on high-pressure models |
| Air Vent | Bimetallic strip or balanced-pressure capsule in SS316 housing |
| Gasket | Spiral-wound SS316 + graphite for body/cover joint |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | ISO 7842 / EN 26948 cold water test |
| Certification | CE, ISO 9001, IBR |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | ISO 6552 / EN 26704 |
Notes
- Float traps are sensitive to water hammer; install with adequate drip leg volume and avoid direct discharge from high-velocity steam into trap.
- Back pressure must not exceed 80% of inlet pressure; higher back pressure causes float to remain depressed and trap to flood.
- Bimetallic air vent opens on cold start-up and closes at ~100°C; for systems with high non-condensable gas load, specify balanced-pressure capsule vent.
- For superheated steam above 350°C, specify SS316 body and Inconel float with extended bonnet to protect vent from radiant heat.
- Trap must be installed with float chamber vertical and flow direction as marked; horizontal installation requires special float guide and must be specified.
