Thermodynamic Steam Trap -- Disc Type Carbon Steel 800 PSI
High-Pressure Self-Acting Condensate Drainage for Steam Systems
Document No.SV-DS-STE-001
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers thermodynamic disc-type steam traps in carbon steel for high-pressure steam drainage, tracing, and process equipment condensate removal rated to 800 PSI.
Technical Specifications
| Parameter | Specification |
|---|
| Trap Size Range | DN15 to DN50 (1/2" to 2") |
| Pressure Rating | PN40 / Class 300 / 800 PSI max operating |
| Body Material | WCB carbon steel or CF8M (SS316) for corrosive condensate |
| Disc Material | SS410 hardened disc with ground seat |
| Seat Material | SS410 integral seat, lapped to disc |
| Maximum Operating Pressure | 80 bar g (800 PSI) |
| Maximum Operating Temperature | +425°C (saturated steam) |
| Capacity | 500 kg/h to 4,000 kg/h depending on size and differential pressure |
| End Connections | Screwed NPT / BSPT, socket weld, flanged |
| Blowdown | Fixed thermodynamic blowdown; variable on request |
| Air Venting | Automatic air venting on start-up; insoluble air pocket above disc prevents air binding |
Materials of Construction
| Component | Material |
|---|
| Body | WCB carbon steel, investment cast or forged, machined seat bore |
| Cover | WCB carbon steel, threaded or bolted cover with gasket groove |
| Disc | SS410 hardened to 45 HRC, precision ground, self-aligning to seat |
| Seat | Integral SS410 in body or replaceable seat ring, lapped to disc |
| Filter | SS304 inline strainer with 0.8 mm perforation, cleanable |
| Gasket | Graphite compressed sheet or spiral-wound SS316 + graphite |
| Insulation Cap | SS304 cap with integral air vent for outdoor installation |
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
- Thermodynamic traps cycle on flash steam; slight steam loss per cycle is normal. For absolute zero-loss requirement, specify inverted bucket or float traps.
- Insulation cap is mandatory for outdoor or windy installation to prevent excessive cycling and steam wastage.
- Inline strainer must be installed upstream of trap and cleaned monthly; debris on seat causes live steam leakage.
- For superheated steam above 350°C, specify SS316 body and disc with Inconel spring to prevent tempering loss.
- Trap capacity charts are based on cold condensate; flash steam in hot condensate reduces effective capacity by 10-15%.
