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Brand: Danfoss
Danfoss 148B5404 REG-SA 25 Hand Regulating Valve, Socket Weld
Description
REG-SA 25: a hand-operated regulating valve with fine metering
The 148B5404 is an REG-SA 25 hand regulating valve from the SVL Flexline range. Unlike a stop valve, the REG valve is made for throttling with a graduated spindle and a defined flow area of 178 mm2 (0.275 in2). Connections are 25 mm (1 in) socket weld to ASME B 16.11 and the body is steel, with a cap rather than a handwheel. Net weight is 3.336 kg.
The ratings printed are a Kv value of 7 m3/h, a maximum working pressure of 52 bar (754 psig) and a temperature range of -60 to 150 C. Approvals shown include CRN, EAC and UA, and the valve is angleway with an embossed arrow.
Technical specifications
| Parameter | Specification |
|---|---|
| Danfoss code number | 148B5404 |
| Type | REG-SA 25 |
| Approvals as listed | CRN; EAC; UA |
| Body material | Steel |
| Connection standard | ASME B 16.11 |
| Flow area | 178 mm2 |
| Inlet connection size | 1 in / 25 mm |
| Inlet connection type | Socket Weld |
| Kv value | 7 m3/h |
| Maximum working pressure | 52 bar |
| Outlet connection size | 1 in / 25 mm |
| Outlet connection type | Socket weld |
| Refrigerants | R134a; R22; R290; R401A; R402A; R404A; R407A; R407B; R407C; R407F; and others listed in the data sheet |
| Temperature range | -60 C to 150 C |
| Net weight | 3.336 kg |
| EAN | 5702428474061 |
Regulating versus shut-off
An REG valve sets the refrigerant flow manually: it serves as a hand expansion valve on flooded evaporators, as a by-pass or as a pressure-balancing valve. The SA version has a smaller flow area than the SB version of the same size, which gives finer adjustment on smaller flows. At DN 25, the SA flow area of 178 mm2 compares with 531 mm2 for an REG-SB 40.
The spindle has a scale, so settings can be recorded and repeated. The valve closes tight when turned fully in, but the REG is not meant for long-term isolation in place of a stop valve.
Ordering and installation checks
Choose between the SA and SB flow areas, the connection (socket weld here, butt weld on other codes) and cap or handwheel. The data sheet for REG-SA and REG-SB 10-65 gives Kv and the flow area for every setting so that you can size the valve from the real capacity.
Weld according to the Flexline installation guide, protecting the cone and seals. Confirm refrigerant and the pressure class before ordering. Spare parts are listed for the SVL Flexline platform.
Other types and sizes from the same Danfoss family that appear in the Danfoss store listing include REG-SA SS 10 (148B5017), REG-SA 10 (148B5102), REG-SA 15 (148B5202), REG-SA SS 15 (148B5297), REG-SA 20 (148B5302), REG-SA SS 20 (148B5385), REG-SA SS 25 (148B5494), REG-SA 32 (148B5502). These are listed for orientation only; each has its own datasheet values, so check size, connection and version before ordering.
Documents and quotation
For the full drawings, ordering tables and wiring or piping details, open the attached Danfoss Hand operated regulating valve, type REG-SA and REG-SB 10-65 AI189386433903en-001601 (manufacturer, unaltered) (manufacturer PDF, unaltered). More items of this kind are listed under globe and stop valves. Seven Star LLC supplies from Muscat as an independent supplier: ask for a quotation on 148B5404.
Datasheets & Documents
- Datasheet Danfoss Hand operated regulating valve, type REG-SA and REG-SB 10-65 AI189386433903en-001601 (manufacturer, unaltered) Download
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About brand
Danfoss is the Danish engineering group that makes refrigeration and air-conditioning controls, heating components, variable speed drives and mobile hydraulics. Mads Clausen founded it on 1 September 1933 at his parents' farm in Nordborg on the island of Als, after making his first refrigeration expansion valve in 1932. Nordborg is still the group's headquarters, and Danfoss remains controlled by the Clausen family through the Bitten & Mads Clausen Foundation.
Danfoss company profile
| Founded | 1 September 1933, Nordborg, Denmark, by Mads Clausen (1905–1966) |
|---|---|
| First product | Thermostatic expansion valve for refrigeration |
| Headquarters | Nordborg, Denmark |
| Ownership | Private; majority controlled by the Bitten & Mads Clausen Foundation and the Clausen family |
| Size | About 42,000 employees (2023) |
| Business segments | Danfoss Climate Solutions (refrigeration, air conditioning and heating), Danfoss Drives (VLT and VACON frequency converters, soft starters), Danfoss Power Solutions (mobile and industrial hydraulics) |
| Brands in the group | VLT, VACON, Eaton Hydraulics (bought 2021), Ikusi radio remote controls |
Milestones
- 1932–1933: First expansion valve; the company is founded in Nordborg.
- 1939: 26 employees. By the 10th anniversary in 1943 the company has 179.
- 1950s: Rapid growth turns Nordborg into a Danfoss town with housing and schools for its workforce.
- 1968: Danfoss launches its VLT frequency converter, one of the first mass-produced AC drives.
- 2014: Acquisition of the Finnish drives maker Vacon, now the VACON brand.
- 2021: Acquisition of Eaton's hydraulics business.
Choosing Danfoss products
For solenoid valves, check the operating principle. A direct-operated valve such as EV210B opens even at 0 bar differential pressure. A servo-operated valve such as EV220B needs a minimum differential (typically about 0.3 bar) to open, while an assisted-lift valve such as EV250B works from 0 bar. Coils are ordered separately, so the voltage on the coil (for example 230 V AC or 24 V DC) must match the control circuit. For drives, the VLT family is split by application: FC 51 Micro Drive for small machines, FC 102 HVAC Drive for fans and pumps in buildings, FC 202 AQUA Drive for water, and FC 302 AutomationDrive for demanding industrial duty.
Where Danfoss products are used
In Oman and the GCC, Danfoss drives run pumps, fans and compressors in district cooling plants, water and wastewater stations, desalination and building HVAC. Danfoss pressure switches, transmitters and solenoid valves are built into chillers, refrigeration plants, boilers and hydraulic systems, and AB-QM valves balance chilled-water circuits in large buildings.
Danfoss products we list
| Family | Examples |
|---|---|
| Variable speed drives and soft starters | VLT Micro Drive FC 51, VLT HVAC Drive FC 102, VLT AQUA Drive FC 202, VLT AutomationDrive FC 302, FC 280, iC2-Micro, VACON NXP, MCD 600 soft starter |
| Solenoid valves and coils | EV220B, EV210B, EV250B, EV225B steam, EVR 25, AM230C coil |
| Pressure switches and thermostats | KP 37, KP 44, RT 200, CS, MBC 5000, KPS 77, RT 101 |
| Pressure transmitters | MBS 3000, MBS 5100, MBS 3250, MBS 4251 Ex, AKS 33, DST P92S SIL 2 |
| HVAC and refrigeration valves | AB-QM PICV, NovoCon S, AB-PM, AVTA, ICV, TE 5 element |
Ordering Danfoss products: what we need
Send the Danfoss code number from the label (for example 032U7115 or 131B0149) or the full drive type code (FC-302P3K0T5...). For drives, add the motor power, supply voltage and any fieldbus option. For valves, add the size, connection, medium and coil voltage. For pressure switches and transmitters, add the range, output and pressure connection.
Facts checked against Danfoss's company history pages and published company data, October 2026.
Browse Danfoss products by category: AC Drives, Pressure Instrumentation, Control Valves, Solenoid Valve.
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Frequently Asked Questions
What is Danfoss 148B5404?
An REG-SA 25 steel hand regulating valve with 25 mm socket-weld connections and a graduated spindle.
What is the flow area?
178 mm2 (0.275 in2) with a Kv of 7 m3/h.
Can it be used as a stop valve?
It closes tight, but it is made for regulation; use an SVA for long-term isolation.
What are the limits?
52 bar (754 psig) and -60 to 150 C.
Which document is attached?
The Danfoss REG-SA and REG-SB 10-65 data sheet AI189386433903en-001601.
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