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Brand: Samson
Samson Type 41-23 Universal Pressure Reducing Valve
Description
Samson Type 41-23 universal pressure reducing valve for downstream pressure control
The Samson Type 41-23 is a self-operated pressure reducing valve that holds the downstream pressure at an adjustable set point without any auxiliary energy. It closes when the pressure after the valve rises, and it covers set points from 0.05 to 28 bar, nominal sizes DN 15 to 100 and pressure ratings PN 16, 25 and 40. It is suited to liquids, gases and vapors from –50 to 350 °C. Seven Star LLC supplies the Type 41-23 in Oman and the GCC as an independent supplier in Muscat.
The assembly is made of a Type 2412 globe valve and a Type 2413 diaphragm or bellows actuator. The valve plug is balanced by a stainless steel bellows, the plug stem is sealed by a bellows rather than a rubbing packing, and every wetted part is free of non-ferrous metal.
How the 41-23 designation is built
The datasheet describes the DIN version, so confirm the flange standard when you order. The ordering text asks for the additional features, DN, body material, PN, the KVS coefficient, the set point range and the optional accessories or special version. In practice these are the choices that define a 41-23: body material (cast iron, spheroidal graphite iron, cast steel, stainless steel or forged), actuator type (diaphragm for 0.05 to 16 bar or bellows for 2 to 28 bar), and the trim (metal seat or soft seal).
Type 41-23 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Samson / Type 41-23 Universal Pressure Reducing Valve (DIN version) |
| Valve / actuator | Type 2412 globe valve with Type 2413 diaphragm or bellows actuator |
| Nominal size | DN 15, 20, 25, 32, 40, 50, 65, 80, 100 |
| Pressure rating | PN 16, 25 or 40 |
| Set point range | 0.05 to 28 bar in several spring ranges |
| Medium temperature | –50 to 350 °C overall; body limit 300 °C for PN 16 and 350 °C for PN 25 and 40; FDA version max. 60 °C |
| Max. differential pressure | 16 bar (PN 16 only) or 25 bar for DN 15 to 50; 16 or 20 bar for DN 65 to 80; 16 bar for DN 100 |
| Leakage class (DIN EN 60534-4) | Metal seal: class I (≤0.05 % of KVS); soft seal: class IV (≤0.01 % of KVS) |
| Body materials | EN-GJL-250, EN-GJS-400-18-LT, 1.0619, 1.4408, forged steel 1.0460, forged stainless steel 1.4401/1.4404 |
| Plug seal options | PTFE with 15 % glass fiber, EPDM, NBR, FKM |
| Balancing / bellows | CrNiMo steel; KVS up to 2.5 without balancing bellows |
| Sizing terms | FL = 0.95; xT = 0.75 |
How the 41-23 reducing valve works
The medium passes through the valve and the plug position sets the free area between plug and seat. The plug stem is joined to the stem of the actuator. A set point spring (or springs) and an adjusting nut tension the operating diaphragm so that, with no pressure difference, the valve is held open. The downstream pressure p2 is tapped after the valve and carried by a control line to the diaphragm, where it becomes a force opposing the spring. When p2 rises above the set point, the valve closes proportionally; when it falls, the valve opens.
Because the pressure on the plug is balanced by the bellows (upstream outside, downstream inside), changes in inlet pressure have little effect on the control position. This gives a stable outlet pressure over a wide inlet-pressure range with a simple proportional controller.
Set point ranges, actuators and KVS values of the 41-23
| Actuator area | Set point range | Actuator type |
|---|---|---|
| 640 cm² | 0.05 to 0.25 bar; 0.1 to 0.6 bar | Diaphragm |
| 320 cm² | 0.2 to 1.2 bar | Diaphragm |
| 160 cm² | 0.8 to 2.5 bar (1 to 2.5 bar with two diaphragms) | Diaphragm |
| 80 cm² | 2 to 5 bar | Diaphragm |
| 40 cm² | 4.5 to 10 bar; 8 to 16 bar | Diaphragm |
| 62 cm² | 2 to 6 bar; 5 to 10 bar | Bellows |
| 33 cm² | 10 to 22 bar; 20 to 28 bar | Bellows |
Standard KVS values by size are DN 15 = 4, DN 20 = 6.3, DN 25 = 8, DN 32 = 16, DN 40 = 20, DN 50 = 32, DN 65 = 50, DN 80 = 80 and DN 100 = 125. Reduced KVS trims down to 0.1 (and a micro-flow trim of 0.001 to 0.04 for DN 15 to 25) are available, and flow dividers ST 1 or ST 3 can be added (listed for DN 65 to 100) to reduce noise on gas and steam.
Where the 41-23 fits in the system and related parts
The Type 41-23 is the reducing member of the Samson universal series. Its counterpart is the Type 41-73 universal excess pressure valve, which has the same actuators but opens on rising upstream pressure, and the Type 2405 pressure reducing valve is a more compact regulator for lower set points and gas supply lines. Selection between them depends on whether you want to hold downstream pressure (41-23), relieve or hold upstream pressure (41-73), or regulate low-pressure fuel gas or blanketing gas (2405).
Accessories include a control line kit to tap the pressure directly at the valve body (for set points of 0.8 bar and above), a screw joint with restriction for a 6 mm control line that is supplied with the valve, compression fittings for 8 or 10 mm pipe, and a compensation chamber of 0.7, 1.5 or 2.4 litres for condensate and protection of the diaphragm. A compensation chamber is required for liquids above 150 °C and for steam.
Selection checklist for Type 41-23
- Medium, flow range and inlet and outlet pressures, to size the KVS and check differential pressure.
- Nominal size and PN, with body material suited to the fluid and temperature.
- Set point range and actuator: diaphragm for low and medium pressure, bellows above 10 bar.
- Seat type: metal seal for general service, soft seal for tight shut-off, Stellite-faced trim for wear.
- Special versions: FKM internals for mineral oil, oil-free for high purity, increased-safety actuator with leakage line or double diaphragm.
- Control line kit or compensation chamber when steam or hot liquid is controlled.
Installation, commissioning and maintenance
Install the valve with the actuator hanging downward, with the flow arrow matching the body, and with horizontal pipework sloping slightly to both sides for condensate drainage. The control line is not included in the standard scope of supply; it is routed from a straight pipe section downstream and should be sized and sloped according to site practice. For steam, fill the compensation chamber through the filler plug before start-up.
Set points are adjusted by turning a nut on the actuator and checked on a pressure gauge in the downstream line. Since the set point springs and the actuator are exchangeable, a change of duty can often be met by changing springs rather than the whole valve. Typical spares are the diaphragm, the seat and plug, and the bellows set.
Typical applications in Oman and the GCC
Self-operated reducing valves of this class are used for steam pressure reduction to tracing and heating headers, nitrogen and instrument-gas letdown, fuel-gas and utility air supply, cooling water and hot-oil systems in oil and gas, power, desalination and petrochemical plants. As no instrument air or electrical supply is needed, they are useful at remote sites and where a pressure loop must keep working during a power outage. High ambient temperatures and humid coastal air favor the stainless steel body and bellows construction.
Information to send with an RFQ
- DN, PN, end connection standard (DIN, ANSI or JIS) and quantity
- Medium, temperature, inlet pressure range, set point and flow rate
- Body material and seat seal
- Required KVS or flow data
- Control line, compensation chamber or other accessories
- Special requirements such as oil-free, FKM or double diaphragm
Documents and quotation
A datasheet for the Samson Type 41-23 is attached on this page.
Send the part number 41-23 together with the duty data and Seven Star LLC will prepare a quotation for supply to Oman and the GCC. We are an independent supplier and not a Samson representative.
Other Models in the Samson Self Operated Regulators Range
Seven Star LLC supplies models from the Samson Self Operated Regulators range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Samson Type 41-23 Universal Pressure Reducing Valve | Regulators | You are viewing this model |
| Samson 2406 Excess Pressure Valve DN 15-50 PN 16-40 | Regulators | View details |
| Samson 2371 Hygienic Pressure Reducing Valve DN 15-50 | Regulators | View details |
Datasheets & Documents
- Datasheet Samson Type 41-23 Datasheet T 2512 Download
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About brand
SAMSON is a German manufacturer of control valves, actuators, positioners and self-operated regulators. Hermann Sandvoss founded the company in Düsseldorf on 1 April 1907, and its first important product was a thermostatic valve that controlled temperature without external power. After moves to Mannheim, SAMSON settled in Frankfurt am Main in 1916, where SAMSON AG is still headquartered.
Seven Star LLC supplies Samson control valves, pneumatic actuators and positioners to process plants in Oman, including the types listed on this page and their replacement units.
Samson company profile
| Founded | 1 April 1907, Düsseldorf, by Hermann Sandvoss, as VULCAN Technische Apparate Baugesellschaft; products sold under the SAMSON name |
|---|---|
| Headquarters | Frankfurt am Main, Germany, since 1916 |
| Legal form | SAMSON AG |
| First product | A self-operated thermostatic valve |
| Group brands | SAMSON together with PFEIFFER, LEUSCH, VETEC and AIR TORQUE |
| Product families | Globe valves such as Type 3241, rotary and butterfly valves, 3271 and 3277 pneumatic actuators, 3730 and 3731 positioners, self-operated pressure and temperature regulators |
Milestones
- 1907: Hermann Sandvoss founds the company in Düsseldorf.
- 1909: It is re-established as SAMSON Apparatebau GmbH.
- 1916: After a period in Mannheim, the company moves to Frankfurt am Main.
- 1975: The name becomes SAMSON Mess- und Regeltechnik.
Samson valve, actuator and positioner types
Samson builds a control valve from modules. The Type 3241 globe valve is the general-service body of Series 240, and the Type 3251 is the Series 250 body for higher pressure ratings. Either one is combined with a Type 3271 pneumatic diaphragm actuator or a Type 3277, whose yoke allows the positioner to be attached directly with a concealed travel linkage.
Among the positioners listed are the Type 3725 and the Type 3730 family: the 3730-1 as the basic electropneumatic version, sold in its current generation as TROVIS 3730-1, and the 3730-3 with HART communication and valve diagnostics. Samson also makes PROFIBUS PA and FOUNDATION fieldbus variants in the same family, plus self-operated pressure and temperature regulators.
Where Samson valves are used
Samson control valves throttle steam, gas and liquids in chemical and petrochemical units, refineries, gas processing, power stations, water and desalination plants, and food production. Many reach site as part of a skid or package, so the plant instrument team often meets them first when a positioner or actuator needs replacing. We supply these items to end users and contractors throughout the GCC.
Samson products we list
Ordering Samson parts: what we need
Every Samson device has a nameplate with the type, a configuration ID (Var-ID) and a serial number. A photo of that plate is the surest route to an exact match. Without it, please send:
- Valve: type, DN or NPS, pressure rating, body and trim material, Kvs or Cv, plug and seat style, packing and bonnet type
- Actuator: type, effective area in cm², bench range, fail action and travel
- Positioner: full type code including Ex protection, communication and options such as limit switches or position transmitter
We check the code against Samson documentation and provide the manufacturer's data sheet on request.
Facts checked against SAMSON's corporate chronicle and press material, October 2026.
Browse Samson products by category: Control Valves, Valve Positioner, Valve Actuator.
FAQ
Questions about the Samson Type 41-23 Universal Pressure Reducing Valve
Answers from our engineering team on installation, compatibility and integration.
01What does the Samson Type 41-23 do?
It is a self-operated pressure reducing valve that keeps the downstream pressure at the adjusted set point. The valve closes when the pressure after the valve rises, and no auxiliary energy is needed.
02What set point range and sizes does the 41-23 cover?
Set points run from 0.05 to 28 bar with several spring and actuator combinations. Nominal sizes are DN 15 to 100 in PN 16, 25 and 40.
03Which media and temperatures are allowed?
Liquids, gases and vapors from –50 to 350 °C, depending on body material and plug seal. The FDA version is limited to 60 °C.
04When is a compensation chamber needed?
The datasheet requires a compensation chamber for steam and for liquids above 150 °C. It protects the operating diaphragm and is available in 0.7, 1.5 and 2.4 litre sizes.
05What leakage class is achieved?
The metal-seated plug meets leakage class I (≤0.05 % of KVS) and the soft-seated plug meets class IV (≤0.01 % of KVS) according to DIN EN 60534-4.
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