The Gestra UNA25PS is a cyclic condensate lifter with a nominal diameter of DN40 and a pressure rating of PN40, featuring DIN/ANSI flanged connections. It supports a driving steam pressure of 3 to 13 barg and uses externally supplied driving steam to lift condensate into the system circuit. During operation, the driving steam pressure must exceed the back pressure by 1 bar, and the back pressure must not exceed 5 bar. The product is designed specifically for condensate recovery and lifting in steam systems and effectively addresses condensate recovery requirements within the system.
Gestra condensate lifter UNA25PS, 3/4-inch angle product image
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UNA25PS Cyclic Condensate Lifter | Gestra
Cyclic condensate lifter with DIN/ANSI flange connections, dedicated to condensate recovery and lifting.
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Specifications
- Operating mode
- Cyclic condensate lifter without valve shut-off function
- Nominal diameter
- DN40
- Pressure rating
- PN40
- Connection type
- DIN/ANSI flanges
- Pressure-temperature ratings
- 40.5 bar at 20°C; 38.3 bar at 120°C; 31.6 bar at 250°C; 25.0 bar at 350°C
- Maximum driving steam pressure
- 13 barg
- Minimum driving steam pressure
- 3 barg
- Maximum operating back pressure
- 5 bar
- Driving steam differential pressure requirement
- The driving steam pressure must exceed the back pressure by 1 bar
- Driving steam connection
- G½ female thread
- Vent connection
- G½ female thread
- Minimum filling height
- 0.5 m
- Minimum inlet pipeline length
- 2.5 m, DN40
- Buffer vessel requirement
- Volume 3 l
- Overall dimensions
- Overall length 230 mm; width 325 mm; overall height 318 mm
- Maintenance clearance
- 200 mm
- Weight
- 31 kg (flanged version)
- Fluid group
- PED Group 2 fluids
Application scenarios
Condensate recovery and lifting in steam systems
As a DN40, PN40 cyclic condensate lifter with flanged connections, the UNA25PS uses externally supplied driving steam to lift condensate and return it to the condensate circuit of the steam system. During operation, the back pressure must not exceed 5 bar, and the driving steam pressure must exceed the back pressure by 1 bar.
Installation & maintenance notes
Inlet pipeline length requirement
During installation, the DN40 inlet pipeline must be at least 2.5 m long.
Maintenance clearance requirement
A maintenance clearance of 200 mm must be provided during equipment installation.
Driving steam and back pressure differential requirement
The driving steam pressure must exceed the operating back pressure by 1 bar.
FAQ
How does the UNA25PS work?
As a condensate lifter, the UNA25PS uses a float to open the motive steam inlet; the motive steam displaces the condensate, after which the float drops and the cycle repeats. This enables continuous discharge of condensate in steam systems while reducing steam loss.
What is the main difference between the UNA25PS and the UNA25PK?
The UNA25PS is a cyclic condensate lifter with no valve shutoff function; the UNA25PK provides a rolling-ball valve shutoff in the same cyclic mode and can, under certain differential pressure conditions, operate in continuous discharge mode or serve as a modulating steam trap.
What connections and body material does this unit use?
Connections are DIN/ANSI flanges, and the body material is steel (1.0460).
What pressure conditions is the UNA25PS suitable for?
The maximum motive steam pressure and differential pressure depend on the design: the maximum motive steam pressures of the UNA25PK/UNA25PS are 6 bar and 13 bar respectively; maximum permissible back pressure values are also subject to corresponding limits, depending on the specific model and actual operating conditions.