Sort by
Gestra UNA45hl 2 1/2" Class 150 steam trap duplex control unit AO8
Product number
Copy to clipboard 360-1124-10
GESTRA UNA 45hl steam trap 2 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 8, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 292mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Nominal width :
DN65 - 2 1/2'' inch
Categories :
UNA 45hl
Body:
Steel
Price €2,794.30
€3,325.22 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1/2" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-04
GESTRA UNA 45hl steam trap 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 150mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN15 - 1/2'' inch
Body:
Steel
Price €548.28
€635.51 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 3/4" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-05
GESTRA UNA 45hl steam trap 3/4 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 150mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN20 - 3/4'' inch
Body:
Steel
Price €599.63
€695.69 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-06
GESTRA UNA 45hl steam trap 1 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 160mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Nominal width :
DN25 - 1'' inch
Categories :
UNA 45hl
Body:
Steel
Price €675.47
€784.07 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1 1/2" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-08
GESTRA UNA 45hl steam trap 1 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 241mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN40 - 1 1/2'' inch
Body:
Steel
Price €1,121.83
€1,302.07 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 2" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-09
GESTRA UNA 45hl steam trap 2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 267mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN50 - 2'' inch
Body:
Steel
Price €1,366.74
€1,586.00 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 2 1/2" Class 150 steam trap duplex control unit AO4
Product number
Copy to clipboard 360-1125-10
GESTRA UNA 45hl steam trap 2 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 4, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 292mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN65 - 2 1/2'' inch
Body:
Steel
Price €2,794.30
€3,243.43 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1/2" Class 150 steam trap steel duplex control unit AO2
Product number
Copy to clipboard 360-1126-04
GESTRA UNA 45hl steam trap 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 150mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN15 - 1/2'' inch
Body:
Steel
Price €548.28
€652.45 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 3/4" Class 150 steam trap duplex control unit AO2
Product number
Copy to clipboard 360-1126-05
GESTRA UNA 45hl steam trap 3/4 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 150mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN20 - 3/4'' inch
Body:
Steel
Price €599.63
€695.69 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1" Class 150 steam trap steel duplex control unit AO2
Product number
Copy to clipboard 360-1126-06
GESTRA UNA 45hl steam trap 1 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 160mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN25 - 1'' inch
Body:
Steel
Price €675.47
€784.07 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 1 1/2" Class 150 steam trap steel duplex control unit AO2
Product number
Copy to clipboard 360-1126-08
GESTRA UNA 45hl steam trap 1 1/2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 241mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN40 - 1 1/2'' inch
Body:
Steel
Price €1,121.83
€1,302.07 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra UNA45hl 2" Class 150 steam trap steel duplex control unit AO2
Product number
Copy to clipboard 360-1126-09
GESTRA UNA 45hl steam trap 2 inch Class 150Ball float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges ASME B 16.5, Class 150 RF, face-to-face dimension 267mm, body 1.0460/ASTM A105, cover 5.3103 (A395), gasket graphite/CrNi, stainless steel internal parts
Categories :
UNA 45hl
Nominal width :
DN50 - 2'' inch
Body:
Steel
Price €1,366.74
€1,586.00 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
GESTRA Steam Traps — Series Comparison
| Series | Operating Principle | Nominal Sizes | PN / Class | Typical Application |
|---|---|---|---|---|
| BK 15 | Thermostatic — bimetallic (Thermovit) | DN15–DN50 | PN40 | Superheated steam, high pressures, batch operation |
| BK 45 | Thermostatic — bimetallic (Duo steel) | DN10–DN25 | PN25/40, ANSI 150, ASME 300 | Standard steam, continuous duty, load changes |
| MK 45-1 | Thermostatic — tandem membrane (Hastelloy) | DN10–DN25 | PN25/40, ANSI 150, ASME 300 | Low condensate loads, low differential pressure |
| MK 45-2 | Thermostatic — flat membrane (Hastelloy) | DN10–DN25 | PN25/40, ANSI 150, ASME 300 | Higher condensate loads, heat exchangers |
| MK 45A-1/2 | Thermostatic — membrane (stainless steel 1.4027) | DN10–DN25 | PN25/40 | Stainless steel systems, hygienic media |
| DK 47-L/H | Thermodynamic | DN10–DN25 | PN40 | Compact, high pressure, steam tracing |
| UNA 14/16 | Mechanical — float | DN15–DN50 | PN10/16/25/40 | Continuous discharge, sensitive processes |
| UNA 45hl | Mechanical — float (RHOMBUSline) | DN15–DN65 | PN25/40 | High condensate loads, continuous duty |
Technical Data — GESTRA Steam Traps
- Nominal size: DN10 to DN65
- Pressure rating: PN10, PN16, PN25, PN40; ANSI Class 150; ASME Class 300
- Connection: Flanged to EN 1092 (Form B1), threaded sockets to EN ISO 228-1, socket weld ends to EN 12627, ASME B16.5
- Body: Carbon steel 1.0460 / ASTM A105 (standard); stainless steel 1.4027 (MK45A)
- Internals: Stainless steel, Duo steel (BK), Hastelloy control membrane (MK)
- Gasket: Graphite/CrNi
- Trim: Duplex (optional)
- Closure elements: AO 2, AO 4, AO 8, AO 13, AO 22, AO 32 (depending on condensate load)
- Integrated: Strainer (Y-screen), check valve (all RHOMBUSline series)
- Compliance: EU Pressure Equipment Directive 2014/68/EU
Application Areas — GESTRA Steam Traps
| Industry | Recommended Series | Reason |
|---|---|---|
| Steam distribution / steam mains | BK 45 / BK 15 | Superheat resistant, robust bimetallic control |
| Heat exchangers / recovery | MK 45-1 / MK 45-2 | Membrane control at low differential pressure |
| Food / pharma / sterilisation | UNA 14/16 / MK 45A (stainless) | Continuous discharge, stainless steel body |
| Power plants / energy generation | BK 15 / UNA 45hl | High pressures, large condensate volumes |
| Steam tracing | BK 45 / DK 47 | Compact, any mounting position, small DN |
| Chemical / petrochemical | BK 15 / MK 45A (stainless) | High pressures, corrosive media |
Selecting a Steam Trap — BK, MK or UNA?
| Criterion | BK (Bimetallic) | MK (Membrane) | UNA (Float) |
|---|---|---|---|
| Operating principle | Bimetallic plates expand at steam temperature and close | Hastelloy membrane responds to temperature difference | Float rises with condensate level and opens the outlet |
| Condensate discharge | Sub-cooled condensate (intermittent) | Sub-cooled condensate (intermittent) | Condensate at saturation temperature (continuous) |
| Superheated steam | Yes — optimised for superheat | Limited | No |
| Differential pressure | Medium to high | Very low to medium | Low to high |
| Air venting | Automatic at start-up | Automatic at start-up | Via thermostatic element |
| Mounting position | Any | Any | Horizontal (h) or vertical (v) depending on variant |
| Typical application | Steam mains, tracing, superheaters | Heat exchangers, recovery, low ΔP | Process heating, dryers, sterilisation, continuous duty |
Media resistance can be checked in advance using the Resistance Tool. For requirements beyond the standard range, FERGO configures custom solutions.
GESTRA Steam Traps from Stock — Delivery across Europe
FERGO stocks 216 GESTRA steam traps — BK, MK, UNA and DK, DN10 to DN65, in carbon steel and stainless steel, with flanged, threaded and socket weld connections. Standard shipping via DHL takes 2–7 working days. Every steam trap is delivered with a datasheet and declaration of conformity. All certificates are available for download in the shop. For complementary steam system components — globe valves, strainers, GESTRA check valves and pressure gauges — FERGO offers a complete steam system supply from a single source.
FAQ
Frequently asked questions Show FAQ
Certificates
Certificate for fittings Certificates
Special solutions
Solutions for your requirements Special solutions
Resistance check
Resistance list for media selection Resistance Test