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Gestra MK45-2 3/4 inch internal threads thermostatic steam trap steel Rhombusline
Product number
Copy to clipboard 363-4527-05
GESTRA MK 45-2 G3/4 Zoll female threads GESTRA Rhombusline thermostatic steam trap, With single seat standard capsule 5N2 for larger condensate flowrates, With Y-strainer and integrated water hammer protection, Connection: internal threads according to EN ISO 228-1, Face-to-face dimension 95mm, Body and bonnet 1.0460 / ASTM A105, Sealing ring graphite/CrNi, Control diaphragm: Hastelloy®, Internal parts: Stainless steels
Categories :
MK 45-2
Nominal width :
DN20 - 3/4'' inch
Body:
Steel
Price €289.94
€341.27 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra BK45 1 inch internal threads thermostatic steam trap steel Rhombusline
Product number
Copy to clipboard 363-4507-06
GESTRA BK 45 1 inch female threadsConnection: female threads to EN ISO 228-1, overall length: 95mm, body, bonnet 1.0460/ASTM A105, gasket: graphite/CrNi, regulator with stainless steel duo steel plates, stainless steel internal parts
Nominal width :
DN25 - 1'' inch
Categories :
BK 45
Body:
Steel
Price €306.53
€364.77 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Steam trap Gestra UNA45hl DN 20 PN40 steel duplex control unit AO2
Product number
Copy to clipboard 360-1106-05
GESTRA UNA 45hl DN 20 steam trap PN40Float steam trap with control unit DUPLEX, orifice (AO) 2, Installation between flanges EN 1092-1 PN40 form B1, 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
€713.56 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Steam trap Gestra UNA45hl DN 25 PN40 steel duplex control unit AO2
Product number
Copy to clipboard 360-1106-06
GESTRA UNA 45hl DN 25 steam trap PN40 Ball float steam trap with control unit DUPLEX, orifice (AO) 02, Installation between flanges EN 1092-1 PN40 form B1, 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 steam trap UNA14h DN 25 PN25 DUPLEX (AO)4
Product number
Copy to clipboard 360-1000-06
Ball float steam trap with DUPLEX control valve and (AO)4 shut-off device for horizontal pipes, suitable for installation between EN 1092-1 PN25 flanges. The robust 1.0460 housing with stainless steel internal parts offers a long service life and operational reliability. With high corrosion resistance and minimal maintenance requirements, the trap is ideal for condensate from steam, cold condensates, and distillates.
Categories :
UNA 14h
Nominal width :
DN25 - 1'' inch
Body:
Steel
Price €450.31
€535.87 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra MK45-2 1/2 inch internal threads thermostatic steam trap steel Rhombusline
Product number
Copy to clipboard 363-4527-04
GESTRA MK 45-2 G1/2 Zoll female threads GESTRA Rhombusline thermostatic steam trap, With single seat standard capsule 5N2 for larger condensate flowrates, With Y-strainer and integrated water hammer protection, Connection: internal threads according to EN ISO 228-1, Face-to-face dimension 95mm, Body and bonnet 1.0460 / ASTM A105, Sealing ring graphite/CrNi, Control diaphragm: Hastelloy®, Internal parts: Stainless steels
Categories :
MK 45-2
Nominal width :
DN15 - 1/2'' inch
Body:
Steel
Price €287.57
€338.45 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra MK45A-1 1/2 inch internal threads thermostatic steam trap stainless steel Rhombusline
Product number
Copy to clipboard 363-4518-04
GESTRA MK 45A-1 G1/2 inch female threadsRhombusline thermostatic steam trap, With tandem diaphragm 5N1 (standard) for small condensate quantities, With Y-type strainer and integrated water hammer protection, Connection: internal threads according to EN ISO 228-1, Face-to-face dimension 95mm, Body and bonnet 1.4404 / ASTM A182 F316L, Sealing ring graphite/CrNi, Control diaphragm: Hastelloy®, Internal parts: Stainless steels
Nominal width :
DN15 - 1/2'' inch
Categories :
MK 45A-1
Body:
Stainless Steel
Price €583.04
€686.30 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra BK45 1/2 inch internal threads thermostatic steam trap steel Rhombusline
Product number
Copy to clipboard 363-4507-04
GESTRA BK 45 1/2 inch female threadsConnection: female threads to EN ISO 228-1, overall length: 95mm, body, bonnet 1.0460/ASTM A105, gasket: graphite/CrNi, regulator with stainless steel duo steel plates, stainless steel internal parts
Nominal width :
DN15 - 1/2'' inch
Categories :
BK 45
Body:
Steel
Price €299.42
€356.31 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra MK45A-1 DN 25 PN40 thermostatic steam trap stainless steel Rhombusline
Product number
Copy to clipboard 363-4512-06
Steam trap GESTRA MK 45A-1, DN 25 PN40Rhombusline thermal steam trap, With tandem diaphragm 5N1 (standard) for small condensate quantities, With strainer (Y strainer) and integrated non-return function, Installation between flanges EN 1092, PN40, form B1, Face-to-face dimension 160mm, Body and bonnet 1.4404 / ASTM A182 F316L, Sealing ring graphite/CrNi, Control diaphragm: Hastelloy®, Internal parts: Stainless steel
Nominal width :
DN25 - 1'' inch
Categories :
MK 45A-1
Body:
Stainless Steel
Price €657.30
€773.73 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Gestra BK15 DN 50 PN40 thermostatic steam trap with bimetallic regulator
Product number
Copy to clipboard 362-1500-09
Steam trap GESTRA BK 15 DN 50Thermostatic steam trap with bimetallic regulator, for installation between flanges EN 1092, PN40, form B1, face-to-face dimension: 230mm, body, bonnet 1.0460/ASTM A105, body gasket graphite, Thermovit disc stainless steel/duostainless steel, internal parts stainless steel With internal strainer and integrated non-return valve.
Categories :
BK 15
Nominal width :
DN50 - 2'' inch
Body:
Steel
Price €1,203.99
€1,417.71 incl. VAT Delivery Time: 2-7 Days
Available: In Stock
Steam trap Gestra UNA45hl DN 25 PN40 steel duplex control unit AO13
Product number
Copy to clipboard 360-1103-06
GESTRA UNA 45hl DN 25 steam trap PN40 Ball float steam trap with control unit DUPLEX, orifice (AO) 13, Installation between flanges EN 1092-1 PN40 form B1, 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
Steam trap Gestra UNA45hl DN 40 PN40 steel duplex control unit AO13
Product number
Copy to clipboard 360-1103-08
GESTRA UNA 45hl DN 40 steam trap DuplexBall float steam trap with control unit DUPLEX, orifice (AO) 13, Installation between flanges EN 1092-1 PN40 form B1, face-to-face dimension 230mm, 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 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.
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Resistance list for media selection Resistance Test