PT61 Float & Thermostatic Steam Trap
Float & thermostatic steam trap with integral air vent — continuous modulating discharge at steam temperature for heat exchangers, unit heaters and process equipment. Rated to 228 psig / 428°F.
- IBR / ASME standard
- Nationwide service
Overview
The PT61 is a float and thermostatic (F&T) steam trap with an integral thermostatic air vent, built with a cast iron body and stainless steel internals for draining condensate from low- and medium-pressure steam heating and process equipment. It gives a continuous, modulating discharge at steam temperature with excellent automatic air venting, so the full heating surface stays active and condensate never backs up to sub-cool inside the equipment.
Typical applications include unit heaters, heat exchangers, driers and jacketed vessels. The trap is rated to a maximum allowable pressure of 228 psig and 428°F.
Variants
- PT61 — standard float & thermostatic trap with thermostatic air vent.
- PT61S — adds a Steam Lock Release (SLR) for equipment prone to steam locking, such as siphon- or rotary-drained cylinders.
- Available in three differential-pressure ratings — PT61-65, PT61-145 and PT61-200 — matched to line pressure.
For higher pressures or socket-weld / flanged ends, step up to the all-stainless PT61SS or the cast-steel PT62.
Built and supplied by ME Engineering to IBR / ASME standards, with full documentation and nationwide service support.
Technical Specifications
| Size (in) | Size (mm) | Dimensions (in) | Weight | |||
|---|---|---|---|---|---|---|
| A | B | C | D | |||
| 1/2", 3/4" | 15, 20 | 5.12 | 5.75 | 2.45 | 4.33 | 7.25 lbs |
| Component | Material |
|---|---|
| Body | Cast Iron |
| Cover | Cast Iron |
| Gasket | Non Asbestos |
| Valve Seat | Cr Steel |
| Ball Float & Lever Assembly | Stainless Steel |
| Air Vent Assembly | Bimetal / SS |
| Bolt | High Tensile / ASTM A193 Gr.B7 |
| Bracket Assembly | AISI 304 |
| Drain Plug | Carbon Steel |
| Gasket (Drain Plug) | Copper |
| SLR Unit | AISI 304 |
| Model | Size | Capacity (lbs/hr) at differential pressure (psi) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7 | 15 | 21.5 | 28.5 | 42.5 | 57 | 65 | 70 | 85 | 100 | 115 | 128 | 145 | 157 | 170 | 185 | 200 | ||
| PT61-65 | 1/2", 3/4" | 440 | 616 | 705 | 770 | 880 | 1000 | 1090 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| PT61-145 | 1/2", 3/4" | 297 | 330 | 365 | 396 | 462 | 530 | 560 | 615 | 660 | 770 | 860 | 890 | 925 | --- | --- | --- | --- |
| PT61-200 | 1/2", 3/4" | 275 | 308 | 330 | 363 | 418 | 485 | 506 | 540 | 595 | 650 | 715 | 770 | 825 | 890 | 946 | 1000 | 1060 |
Applications
Benefits
The float-and-thermostatic combination gives continuous modulating discharge at steam temperature, which suits process equipment like heat exchangers where condensate must be removed the instant it forms to keep the full heating surface active.
The integral thermostatic air vent removes air automatically on start-up, a real advantage over inverted bucket traps that vent air slowly through a small bucket hole and can air-bind at commissioning.
Discharging at steam temperature means condensate does not back up and sub-cool in the equipment, maintaining full heat transfer efficiency, unlike thermostatic-only traps that hold condensate back to cool it.
Three differential-pressure variants (65 / 145 / 200 psi) let the same body be matched to the actual line pressure, since a float trap's orifice must be sized to the differential it works against, and capacity drops as that rating rises.
PT61S with Steam Lock Release handles applications where condensate is trapped behind a steam lock (common in rotating or siphon-drained equipment), which a plain float trap cannot clear on its own.
Cast iron body keeps cost low for general low-to-medium pressure duty, appropriate to the 228 psig ceiling; for higher pressure or SW/FL ends, the PT61SS (all stainless) and PT62 (cast steel) variants are the step up.
Bimetal air vent element resists water hammer and superheat better than a liquid-filled thermostatic capsule, giving longer service life in systems that see pressure or temperature swings.
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PT61 Float & Thermostatic Steam Trap?
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