GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63

Ball Float Steam Trap

GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63 Ball Float Steam
GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63 Ball Float Steam
GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63 Ball Float Steam

GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63 Ball Float Steam Trap

Type UNA 47 and UNA 47 MAX ball float steam traps are used to discharge condensate from steam or other gases or gaseous mixtures.

Models with SIMPLEX control unit are particularly suited to cold condensates, cold distillates and superheated steam.

UNA 47 with SIMPLEX control unit are controlled by the float with rolling ball regulator.

UNA 47 MAX with SIMPLEX control unit are controlled by the float with pilot valve and bellows.

Models with DUPLEX control unit also vent the system. This control unit is especially suitable for steam systems.

UNA 47 with DUPLEX control unit have an additional tem- perature-dependent bimetallic vent, and are also suitable for superheated steam.

UNA 47 MAX with DUPLEX control unit have an additional temperature-dependent vent with membrane regulator cap- sule. In these models, the overheating of the steam on the membrane regulator capsule must not exceed 5 K.

The cover has four holes.

You can lift the ball float manually using the optional manual lifting lever.

The optional manual vent valve allows you to vent the equip- ment and pipe manually.

The equipment may only be used within the admissible pressure and temperature ratings, with due consideration of chemical and corrosive influences.

  • Flange EN 1092-1, B2, PN 63
  • Flange ASME B 5 Class 400/(600) RF
  • Socket-weld end DIN EN 12760
  • Butt-weld end via transition pieces EN 12627, welded joint geometry ISO 9692-1 code no. 1.3 (30° chamfer)
  • Butt-weld end via transition pieces ASME B 25, ASME B 36.10

UNA 47

Nominal size DN 15 (½”) DN 20 (¾”) DN 25

(1″)

 DN 40 (1½”) DN 50

(2″)
W [mm (in)] 290 (11.5)
H1 [mm (in)] 110 (4.4)
H2 [mm (in)] 155 (6.2) 1)
H [mm (in)] 260 (10.3) 1)
L1 [mm (in)] 175 (6.8) 2)
X [mm (in)] 13 (0.5)

1) Plus 25 mm if fitted with manual vent valve.
2) Plus 35 mm if fitted with manual lifting lever.
 

UNA 47 with flange EN 1092-1, B2, PN 63

Nominal size DN 15 (½”) DN 20 (¾”) DN 25

(1″)

 DN 40 (1½”) DN 50

(2″)
Length L [mm (in)] 230 (9.1) 260 (10.3) 290 (11.5)
Weight [kg] 26 28 29 33 34
Weight [lb] 57.3 61.7 64.0 63.9 75.0

 

UNA 47 with flange ASME B16.5 Class 400/(600)

Nominal size DN 15 (½”) DN 20 (¾”) DN 25

(1″)

 DN 40 (1½”) DN 50

(2″)
Length L [mm (in)] 241 (9.5) 267 (10.5) 292 (11.5)
Weight [kg] 25 26 27 32 34
Weight [lb] 55.1 57.3 59.5 70.5 75.0

 

Non-standard length: UNA 47hl replaces UNA 27h with flange EN 1092-1, B2, PN 63

Nominal size DN 25

(1″)

 DN 40 (1½”) DN 50

(2″)
Length L [mm] 300 420 416
Weight [kg] 29 35 37

 

UNA 47 DN15 to DN40 with socket-weld end, UNA 47 DN50 with socket-weld end via transition pieces

Nominal size DN 15 (½”) DN 20 (¾”) DN 25

(1″)

 DN 40 (1½”) DN 50

(2″)
 

Length L [mm (in)]

  

165 (6.5)

(Socket-weld end)

 290 (11.4)

(Socket-weld end via transition pieces EN, ASME)
Weight [kg] 24 23 25 27
Weight [lb] 52.9 50.7 55.1 59.5

GESTRA UNA 47, DN 15, 20, 25, 40, 50 UNA 47 MAX, DN 40, 50 PN 63

Ball Float Steam Trap

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

Premium Ball Float Steam Trap for Maximum Efficiency and Reliability

The GESTRA UNA 47 Ball Float Steam Trap is a high-performance steam trap designed for industrial steam systems that require maximum condensate discharge efficiency, zero steam loss, and long service life. Available in DN 15, DN 20, DN 25, DN 40, and DN 50, the UNA 47 PN 63 series is engineered to perform under high pressure and demanding operating conditions.

If you are searching for the best ball float steam trap, original GESTRA UNA 47, or UNA 47 MAX PN 63, this product delivers unmatched reliability, precision control, and operational safety.

The GESTRA UNA 47 is a mechanical ball float steam trap that automatically discharges condensate as soon as it forms, ensuring continuous heat transfer efficiency and stable steam system performance.

Unlike thermodynamic or thermostatic steam traps, the UNA 47 ball float design responds immediately to condensate level changes, making it ideal for:

  • Heat exchangers

  • Steam heaters

  • Process equipment

  • Industrial steam lines

  • High condensate load applications

Specification Details
Product Type Ball Float Steam Trap
Brand GESTRA
Model UNA 47 / UNA 47 MAX
Nominal Diameter DN 15, DN 20, DN 25, DN 40, DN 50
Pressure Rating PN 63
Connection Type Flanged
Operating Medium Steam & Condensate
Body Material High-grade cast steel
Max Operating Pressure Up to 63 bar
Application Industrial steam systems

1. Zero Steam Loss

The ball float mechanism ensures that only condensate is discharged, preventing valuable steam from escaping and reducing energy loss.

2. Immediate Condensate Removal

The UNA 47 steam trap discharges condensate continuously, preventing water hammer, corrosion, and efficiency loss.

3. High Pressure Performance (PN 63)

Designed for high-pressure steam applications, the UNA 47 MAX operates safely and reliably even under extreme conditions.

4. Long Service Life

GESTRA’s precision engineering and premium materials ensure minimal maintenance and long operational lifespan.

5. Wide Size Range

Available in DN 15, DN 20, DN 25, DN 40, and DN 50, making it suitable for both small and large industrial systems.

The GESTRA UNA 47 PN 63 is widely used across multiple industries:

  • Power plants

  • Oil & gas facilities

  • Chemical processing plants

  • Food & beverage industries

  • Pharmaceutical manufacturing

  • Pulp & paper mills

  • Heat exchangers and steam coils

The UNA 47 ball float steam trap outperforms other steam trap types due to:

  • Continuous condensate discharge

  • High tolerance to load fluctuations

  • Stable operation under varying pressure

  • No steam backup

  • Reduced risk of system damage

When purchasing a GESTRA UNA 47 steam trap, always ensure you receive an original product with:

  • Authentic GESTRA markings

  • Correct PN 63 pressure rating

  • Verified serial number

  • Manufacturer documentation

Using counterfeit steam traps can lead to energy losses, system failure, and costly downtime.

Choosing the right supplier ensures:

✔ Genuine GESTRA products
✔ Competitive pricing
✔ Technical support & consultation
✔ Fast delivery
✔ Warranty assurance

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