The Gestra UNA14 is a float-type steam trap featuring a rolling-ball valve design. It has a P250GH steel body, a nominal pressure rating of PN 25, and a maximum permissible temperature of 350°C. Its control unit can be serviced online without removing the valve from the pipeline. The trap is unaffected by back pressure and can be installed flexibly in horizontal or vertical pipelines. It is suitable for draining high-temperature condensate and removing non-condensable gases such as air from steam systems.
Product photo of Gestra UNA14 ball float steam trap, three-quarter view
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UNA14 Ball Float Steam Trap | Gestra
Ball float steam trap with rolling ball valve, installable horizontally or vertically, with an in-line replaceable control unit.
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Specifications
- Trap type
- Float-type steam trap with rolling-ball valve design
- Nominal pressure
- PN 25
- Connection sizes
- DN15, DN20, DN25
- Connection type
- DIN EN 1092-1 flange (PN 25); BSP or NPT threaded socket
- Body material
- Steel 1.0460 (P250GH)
- Seat sealing material
- Graphite/CrNi
- Maximum permissible pressure/temperature
- 25 bar (-10/20°C); 19.4 bar (200°C); 17.8 bar (250°C); 15 bar (350°C)
- Maximum permissible temperature
- 350°C
- Maximum differential pressure
- 13 bar, depending on the orifice
- Orifice specification
- A0 4 or A0 13
- Installation orientation
- h version for horizontal pipelines; v version for vertical pipelines, convertible by repositioning the valve body and control unit
- Control unit types
- SIMPLEX, SIMPLEX R (continuous venting), or DUPLEX (temperature-dependent automatic venting)
- Effect of back pressure
- Unaffected by back pressure
- Maintenance method
- The control unit can be replaced without removing the valve body from the pipeline
Application scenarios
Removal of non-condensable gases from steam piping systems
The UNA14 can remove non-condensable gases such as air from steam piping systems. Depending on the configuration, it can use a control unit with continuous venting or temperature-dependent automatic venting.
High-temperature condensate drainage in steam systems
As a float-type steam trap, the UNA14 can drain condensate from high-temperature steam systems. The maximum permissible temperature is 350°C, while the applicable pressure and differential pressure must comply with the product rating conditions.
Control unit maintenance without valve body removal
The UNA14 control unit can be replaced without removing the valve body from the pipeline, making it suitable for steam drainage and venting points where simplified field maintenance is required.
Installation & maintenance notes
Match the installation orientation to the pipeline configuration
Select the appropriate version according to the pipeline configuration: the h version is for horizontal pipelines and the v version is for vertical pipelines. Confirm that the control unit orientation matches the installation direction.
Control unit replacement and configuration
The control unit can be replaced without removing the valve body from the pipeline during maintenance. Select the SIMPLEX, SIMPLEX R, or DUPLEX control unit according to the specific operating conditions.
FAQ
How does the UNA14 ball float steam trap work?
The UNA14 uses a float control unit with a rolling ball valve. As the condensate level changes, the float actuates the control unit inside the cover to discharge condensate and conserve steam; back pressure does not affect its operation.
What connection types are available for the UNA14, and how do I choose between them?
The UNA14 supports DIN/ANSI flanges, threaded connections, NPT threads, socket-weld ends, and butt-weld ends. The right choice depends on the site piping connection, the pressure rating, and the installation orientation.
What is the difference between the Simplex and Duplex control units on the UNA14?
The Simplex control unit is for condensate discharge. The Simplex R and Duplex control units add a venting function, with the Duplex providing temperature-dependent venting and suiting saturated steam systems. The exact configuration depends on the specific model.
What are the maximum differential pressure and temperature ratings of the UNA14?
The maximum differential pressure and temperature of the UNA14 series depend on the connection type and materials. The DN15-25 sizes at the PN25 rating withstand the corresponding operating conditions; for exact values, refer to the parameters stated for the specific model.
How do I identify a suitable replacement model or obtain a quotation and delivery time for the UNA14?
Selection should take into account the UNA14 connection type, DN/PN rating, materials, and site operating conditions, and be verified against the technical documentation to confirm the applicable model.