GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50

Ball Float Steam Trap

GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50 Ball Float Steam Trap
GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50 Ball Float Steam Trap
GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50 Ball Float Steam Trap

GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50 Ball Float Steam Trap

UNA 3.. are steam traps with ball float and needle valve for high-pressure applications. The steam traps can be used for all operating conditions, as they are unaffected by back pressure.

The steam trap UNA 3.. consists of a body with bolted cover and a control unit. Various control units are available for the steam trap.

The control unit SIMPLEX is a level-dependent float controller and especially suitable for cold condensate and superheated steam.

The control unit DUPLEX (UNA 38) is a float controller with automatic and temperature dependent deaeration facility by means of a bimetallic air vent. The control unit DUPLEX is suitable for saturated steam and superheated steam.

The control unit with orifice (O) 80 MAX (UNA 38) is de- signed for large flowrates and high pressures and available as SIMPLEX or DUPLEX version.

The control unit with orifice (O) 140 MAX (UNA 39) is a SIMPLEX control unit for large flowrates and high pressure.

As the condensate flows into the steam trap it operates the float, which in turn opens the rolling ball valve of the control unit, and in doing so uncovers the discharge passage. The cross-sectional area of the orifice dictates the max. flow- rate when the discharge passage is completely open. The max. allowable differential pressure of the control unit used depends on the cross-sectional area of the orifice and the density of the fluid to be discharged.

UNA 38 with control unit Orifice 80 MAX and UNA 39 with control unit Orifice 140 MAX:

The float controls a pilot valve as a function of the condensate level in the steam trap. If more condensate flows through the pilot valve out of the control chamber than follows through a balance opening, the pressure in the control chamber drops and the bellows of the control chamber is compressed.

The main valve then opens and the condensate is discharged.

The flowing condensate moves the float ball upwards and the pilot valve closes. The vent hole ensures that the pressure between the control chamber and the interior of the steam trap is evened out such that the main valve closes.

The size of the cross-sectional area of the pilot valve and the main valve ensures only one orifice (O) is needed for the entire range of differential pressure up to 80 bar (or 140 bar).

UNA 38

Flange EN 1092-1 B2 PN 100 Flange ASME B 16.5 CL 600 RF

Socket-weld ends to DIN EN 12760

Socket-weld ends to ASME B 16.11 CL 3000

Butt-weld ends via transition pieces EN 12627, weld joint geometry to ISO 9692-1

Code number 1.3 (30° chamfer)

Butt-weld ends via transition pieces ASME B 16.25 ASME B 36.10

UNA 39

Flange EN 1092-1 B2 PN 160 Flange ASME B 16.5 CL 900 RF

Butt-weld ends EN 12627, weld joint geometry to ISO 9692-1

Code number 1.3 (30° chamfer) Socket-weld ends to DIN EN 12760

Socket-weld ends to ASME B 16.11 CL 6000

GESTRA UNA 38, PN 100/CL 600, DN 15-50 UNA 39, PN 160/CL 900/CL 1500, DN 15-50

Ball Float Steam Trap

GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems

PN 100 / PN 160 – Class 600, 900, 1500 – DN 15–50 High Pressure Steam Trap

Ultimate High-Pressure Ball Float Steam Trap for Industrial Applications

The GESTRA UNA 38 and GESTRA UNA 39 Ball Float Steam Traps are ultra-high-pressure mechanical steam traps designed for the most demanding industrial steam systems. Engineered to operate at PN 100 (Class 600) and PN 160 (Class 900 / Class 1500), these models deliver continuous condensate discharge, zero live steam loss, and maximum operational safety.

Available in DN 15, DN 20, DN 25, DN 40, and DN 50, the UNA 38 and UNA 39 are the preferred solution for critical high-pressure steam applications where reliability and efficiency are non-negotiable.

The GESTRA UNA 38 and UNA 39 utilize a precision mechanical ball float mechanism that responds instantly to condensate formation. This allows continuous condensate removal at steam temperature, ensuring optimal heat transfer and stable system performance even under extreme pressure conditions.

Unlike thermodynamic steam traps, the UNA ball float steam trap prevents condensate backup and eliminates energy waste caused by live steam leakage.

Available Models

  • GESTRA UNA 38 Ball Float Steam Trap

  • GESTRA UNA 39 Ball Float Steam Trap

Technical Data

Specification UNA 38 UNA 39
Pressure Rating PN 100 PN 160
ASME Class Class 600 Class 900 / Class 1500
Nominal Diameter DN 15–50 DN 15–50
Connection Type Flanged Flanged
Steam Medium Steam & Condensate Steam & Condensate
Body Material High-grade forged steel High-grade forged steel
Application High-pressure steam systems Ultra-high-pressure steam systems

1. Designed for Extreme Pressure

The UNA 38 PN 100 and UNA 39 PN 160 are specifically engineered for high and ultra-high-pressure steam environments, ensuring safe and reliable operation.

2. Zero Live Steam Loss

The ball float design guarantees that only condensate is discharged, resulting in maximum energy efficiency and reduced steam consumption.

3. Continuous Condensate Discharge

Condensate is removed immediately as it forms, preventing water hammer, corrosion, and performance degradation.

4. High Operational Safety

Robust construction and precision engineering provide exceptional durability and long service life, even under severe operating conditions.

5. Wide Size Range (DN 15–50)

Suitable for both compact and high-capacity steam systems, offering flexibility across industrial installations.

These high-pressure steam traps are widely used in:

  • Power generation plants

  • Oil & gas refineries

  • Petrochemical processing facilities

  • Chemical manufacturing plants

  • High-pressure heat exchangers

  • Industrial steam distribution networks

Choosing a GESTRA UNA ball float steam trap provides:

  • Immediate response to condensate load changes

  • Stable steam temperature control

  • No steam backing-up in equipment

  • Reduced risk of water hammer

  • Improved overall plant efficiency

Always ensure you purchase original GESTRA steam traps to maintain system safety and efficiency.

Original products include:
✔ GESTRA manufacturer markings
✔ Correct PN & ASME class certification
✔ Official documentation
✔ Verified serial numbers

Using non-original steam traps in high-pressure systems can result in severe equipment damage and safety risks.

✔ Guaranteed genuine GESTRA products
✔ Competitive industrial pricing
✔ Professional technical consultation
✔ Fast delivery & global shipping
✔ Warranty & after-sales support

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