GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40/Class 300 DN 40, 50, 65

Ball Float Steam Trap

GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40 Class 300 DN 40, 50, 65 Ball Float Steam Trap
GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40 Class 300 DN 40, 50, 65 Ball Float Steam Trap
GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40 Class 300 DN 40, 50, 65 Ball Float Steam Trap
GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40 Class 300 DN 40, 50, 65 Ball Float Steam Trap
GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40 Class 300 DN 40, 50, 65 Ball Float Steam Trap

GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40/Class 300 DN 40, 50, 65 Ball Float Steam Trap

UNA 45 MAX, UNA 46 MAX and UNA 46A MAX are items of equipment for the steam process designed for the effective removal of condensate from steam.

The ball float opens the orifice as a function of the liquid level. A rising level results in a proportional opening of the equipment. The max. discharge capacity depends on the size of the fully open orifice (O).

As the float rises with the liquid level it pulls the nozzle stem off the pilot valve, allowing a small amount of fluid to flow through the pilot valve.

The fluid compresses the bellows of the control unit and, as a consequence, the discharge orifice is completely uncovered. Equipment with control unit SIMPLEX is particularly suitable for cold condensates and superheated steam.

Equipment with control unit DUPLEX may also be used for air venting the installation. The control unit DUPLEX consists of a float and a temperature dependent air-venting facility. The air venting is controlled by the membrane regulator. Equipment with this type of control unit is particularly suitable for saturated steam systems. Do not expose the membrane regulator capsule of the DUPLEX control unit to superheat conditions above 5 K.

The optional float-lifting lever allows you to lift the float manually. The optional hand-vent valve allows you to air vent the pipe manually.

The equipment must only be used within the allowable pressure and temperature limits and only if the chemical and corrosive influences on the equipment are taken into account.

The control unit opens the orifice as a function of the liquid level. A rising level results in a proportional opening of the equipment. The max. discharge capacity depends on the orifice size when the ball is completely lifted off its seat and the orifice is fully open.

Equipment with flanges EN 1092-1 PN 10–40

Nominal size Type of cover DN 40 (1½”) DN 50

(2″)

 DN 65 (2½”)
L [mm (in)] All 230 (9.1) 290 (11.4)
B [mm (in)] Standard cover 328 (12.9)
Sightglass cover 370 (14.6)
Cover for mounting electrodes 343 (13.5)
H1 [mm (in)] All 98 (3.9)
H2 [mm (in)] All 182 (7.2)1)
H [mm (in)] All 280 (11.0)1)
L1 [mm (in)] All 160 (6.3)2)
X [mm (in)] All 13 (0.5)
Weight [kg] Standard cover 33.6 35.1 37.4
Sightglass cover 37.5 39.0 41.3
Cover for mounting electrodes 35.5 36.9 39.3
Weight [lb] Standard cover 74.1 77.4 82.5
Sightglass cover 82.7 86.0 91.0
Cover for mounting electrodes 78.3 81.3 86.6

1) If equipped with hand-vent valve add 25 mm (1 in).

2) If equipped with float-lifting lever add 35 mm (1.4 in).

Equipment with flange ASME CL150 and CL300

Class 150 Class 300
Nominal size Type of cover DN 40 (1½”) DN 50

(2″)

 DN 65 (2½”) DN 40 (1½”) DN 50

(2″)

 DN 65 (2½”)
L [mm (in)] All 241 (9.5) 267 (10.5) 292 (11.5) 241 (9.5) 267 (10.5) 292 (11.5)
B [mm (in)] Standard cover 328 (12.9)
Sightglass cover 370 (14.6) –
Cover for mounting electrodes 343 (13.5)
H1 [mm (in)] All 98 (3.9)
H2 [mm (in)] All 182 (7,2)1)
H [mm (in)] All 280 (11,0)1)
L1 [mm (in)] All 160 (6,3)2)
X [mm (in)] All 13 (0.5)
Weight [kg] Standard cover 32.6 34.6 38.2 34.8 36.2 39.9
Sightglass cover 36.5 38.5 42.1 –
Cover for mounting electrodes 34.5 36.5 40.1 36.7 38.1 41.7
Weight [lb] Standard cover 71.9 76.3 84.2 76.7 79.8 88.0
Sightglass cover 80.5 84.9 92.8 –
Cover for mounting electrodes 76.1 80.5 88.4 80.9 84.0 91.9

1) If equipped with hand-vent valve add 25 mm (1 in).

2) If equipped with float-lifting lever add 35 mm (1.4 in).

Equipment with socket-weld ends

Nominal size Type of cover DN 40 (1½”) DN 50

(2″)

 DN 65 (2½”)
L [mm (in)] All 165 (6.5) 267 (10.5) 292 (11.5)
B [mm (in)] Standard cover 328 (12.9)
Sightglass cover 370 (14.6)
Cover for mounting electrodes 343 (13.5)
H1 [mm (in)] All 98 (3.9)
H2 [mm (in)] All 182 (7,2)1)
H [mm (in)] All 280 (11,0)1)
L1 [mm (in)] All 160 (6,3)2)
X [mm (in)] All 13 (0.5)
Weight [kg] Standard cover 29.9 30.9 32.2
Sightglass cover 33.8 34.8 36.1
Cover for mounting electrodes 31.7 32.8 34.1
Weight [lb] Standard cover 65.9 68.1 71.0
Sightglass cover 74.5 76.7 79.6
Cover for mounting electrodes 69.9 72.3 75.2

1) If equipped with hand-vent valve add 25 mm (1 in).

2) If equipped with float-lifting lever add 35 mm (1.4 in).

Equipment with screwed socket

Nominal size Type of cover DN 40 (1½”) DN 50

(2″)
L [mm (in)] All 165 (6.5)
B [mm (in)] Standard cover 328 (12.9)
Sightglass cover 370 (14.6)
Cover for mounting electrodes 343 (13.5)
H1 [mm (in)] All 98 (3.9)
H2 [mm (in)] All 182 (7,2)1)
H [mm (in)] All 280 (11,0)1)
L1 [mm (in)] All 160 (6,3)2)
X [mm (in)] All 13 (0.5)
Weight [kg] Standard cover 30.1 29.6
Sightglass cover 34.0 33.5
Cover for mounting electrodes 32.0 31.4
Weight [lb] Standard cover 66.4 65.3
Sightglass cover 75.0 73.9
Cover for mounting electrodes 70.5 69.2

1) If equipped with hand-vent valve add 25 mm (1 in).

2) If equipped with float-lifting lever add 35 mm (1.4 in).

Equipment with butt-weld end via transition pieces

Nominal size Type of cover DN 40 (1½”) DN 50

(2″)

 DN 65 (2½”)
L [mm (in)] All 241 (9.5) 267 (10.5) 292 (11.5)
B [mm (in)] Standard cover 328 (12.9)
Sightglass cover 370 (14.6)
Cover for mounting electrodes 343 (13.5)
H1 [mm (in)] All 98 (3.9)
H2 [mm (in)] All 182 (7,2)1)
H [mm (in)] All 280 (11,0)1)
L1 [mm (in)] All 160 (6,3)2)
X [mm (in)] All 13 (0.5)
Weight [kg] Standard cover 30.1 30.4 31.3
Sightglass cover 34.0 34.3 35.2
Cover for mounting electrodes 32.0 32.3 33.2
Weight [lb] Standard cover 66.4 67.0 69.0
Sightglass cover 75.0 75.6 77.6
Cover for mounting electrodes 70.5 71.2 73.2

1) If equipped with hand-vent valve add 25 mm (1 in).

2) If equipped with float-lifting lever add 35 mm (1.4 in).

GESTRA UNA 45 MAX, UNA 46 MAX, UNA 46A MAX PN 40/Class 300 DN 40, 50, 65

Ball Float Steam Trap

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

UNA 46A MAX PN 40 / Class 300 DN 40, 50, 65 – High Performance Steam Trap

Industrial-Grade Ball Float Steam Trap for Maximum Efficiency

The GESTRA UNA 45 MAX, UNA 46 MAX, and UNA 46A MAX Ball Float Steam Traps are premium mechanical steam traps engineered for high-efficiency condensate discharge, zero live steam loss, and long-term operational reliability in industrial steam systems.

Designed to operate at PN 40 / ASME Class 300, the UNA 46A MAX is available in DN 40, DN 50, and DN 65, making it the ideal solution for medium to large condensate loads in demanding process applications.

The GESTRA UNA MAX series utilizes a mechanical ball float mechanism that automatically and continuously discharges condensate as soon as it forms, ensuring stable steam temperature, improved heat transfer, and reduced energy consumption.

Unlike thermodynamic steam traps, the UNA 45 MAX and UNA 46 MAX respond instantly to changes in condensate load and pressure, making them ideal for critical steam applications.

Available Models

  • GESTRA UNA 45 MAX Ball Float Steam Trap

  • GESTRA UNA 46 MAX Ball Float Steam Trap

  • GESTRA UNA 46A MAX Ball Float Steam Trap

Key Specifications

Specification Details
Product Type Ball Float Steam Trap
Brand GESTRA
Series UNA MAX
Models UNA 45 MAX, UNA 46 MAX, UNA 46A MAX
Nominal Diameter DN 40, DN 50, DN 65
Pressure Rating PN 40
ASME Rating Class 300
Connection Type Flanged
Body Material High-quality cast steel
Operating Medium Steam & Condensate
Application Industrial steam systems

1. Continuous Condensate Discharge

The ball float design allows condensate to be discharged immediately and continuously, preventing condensate backup and improving heat exchanger efficiency.

2. Zero Live Steam Loss

The UNA MAX steam traps ensure that only condensate is discharged, resulting in significant energy savings and lower operating costs.

3. High Pressure Capability – PN 40 / Class 300

Engineered for high-pressure steam systems, the UNA 46A MAX performs reliably in aggressive industrial environments.

4. High Capacity for Large Systems

With sizes up to DN 65, these steam traps handle large condensate volumes with ease.

5. Low Maintenance & Long Service Life

GESTRA’s precision engineering ensures durability, reduced downtime, and extended maintenance intervals.

The GESTRA UNA 45 MAX, UNA 46 MAX, and UNA 46A MAX PN 40 are widely used in:

  • Heat exchangers

  • Steam heating coils

  • Chemical processing plants

  • Oil & gas facilities

  • Power generation systems

  • Food & beverage processing

  • Pharmaceutical industries

Choosing a ball float steam trap like the GESTRA UNA MAX series provides:

  • Immediate response to condensate formation

  • Stable steam pressure control

  • No condensate backup

  • Reduced risk of water hammer

  • Improved overall system efficiency

To ensure maximum safety and performance, always purchase original GESTRA UNA 45 MAX, UNA 46 MAX, or UNA 46A MAX steam traps from authorized suppliers.

Original GESTRA products include:
✔ Manufacturer markings
✔ PN 40 / Class 300 certification
✔ Official documentation
✔ Verified serial numbers

✔ 100% genuine GESTRA products
✔ Competitive industrial pricing
✔ Expert technical consultation
✔ Fast global shipping
✔ After-sales support & warranty

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