41-23 — Direct acting (Large capacity)
Steam pressure reducing valve regulating downstream steam pressure to a pre-adjusted set point.
SteamFlanged EN1092Large capacity
Pressure Reducing Valves
Industrial Pressure Control
Industrial Pressure Reducing Valves
Industrial pressure reducing valves regulate downstream pressure to a pre-set value, ensuring stable and safe operation in steam, compressed air and liquid systems. Our range includes direct-acting and pilot-operated reducing valves for low, medium and large capacity applications.
Application overview
Pressure reducing valves maintain constant downstream pressure regardless of inlet pressure fluctuations or changes in flow demand. They are commonly used on steam distribution systems, compressed air networks, and utility/process liquid lines to stabilize operating conditions and protect equipment.
How pressure reduction works
- The valve senses downstream pressure and modulates the opening to maintain the set value.
- Direct-acting types use diaphragm/bellows + spring directly on the valve element.
- Pilot-operated types use a pilot stage controlling the main diaphragm for higher stability.
- Better control reduces wear, improves safety and supports stable production conditions.
Typical uses
- Steam headers and local steam pressure control
- Compressed air pressure regulation at equipment points
- Liquid utility pressure reduction
- Surplussing / relief-style operation (selected models)
Product categories
Select the suitable principle and capacity class: large-capacity direct acting (41-23, DRV7), medium-capacity pilot operated (DP27), or low-capacity direct acting (BRV2/LRV2/SRV2).
DRV7 — Direct acting (Large capacity)
Diaphragm/spring controlled steam reducing valve; proportional control with flow-dependent offset.
SteamPN16Robust
DP27 — Pilot operated (Medium capacity)
High accuracy with virtually no offset between no-load and full-load conditions.
SteamCompressed AirPilot operated
BRV2 — Direct acting (Low capacity)
Low-capacity reducing valve for standard steam and compressed air applications.
SteamThreaded ISO7/1-RpLow capacity
LRV2 — Direct acting (Low capacity)
Low-capacity reducing valve for liquids (lower temperature range).
LiquidsRed brassThreaded
SRV2 — Direct acting (Low capacity)
Low-capacity stainless steel valve for clean steam / compressed air with BSP or NPT options.
Clean steam316LBSP / NPT
41-23 — Direct acting (Large capacity)
The Type 41-23 Steam Pressure Reducing Valve regulates the steam pressure downstream from the valve to a pre-adjusted set point value. Designed for industrial steam service with robust construction, easy adjustment and straightforward maintenance.
Features & benefits
- Extremely robust
- Easy to adjust
- Easy to maintain
Key notes
- For steam
- Connection: Flange EN 1092
- Material: GG-25
- With control line and condensation chamber
| Description | Denomination | Bar | Kv | H | L | Part No |
|---|---|---|---|---|---|---|
| For steam · Flange EN 1092 · Material: GG-25 · Control line + condensation chamber | 41-23 DN15 Flange PN16 GG | 0.2–1.2 | 4.0 | 430 | 130 | 90515-0921 |
| For steam · Flange EN 1092 · Material: GG-25 · Control line + condensation chamber | 41-23 DN20 Flange PN16 GG | 2.0–5.0 | 6.3 | 410 | 150 | 90515-0923 |
| For steam · Flange EN 1092 · Material: GG-25 · Control line + condensation chamber | 41-23 DN32 Flange PN16 GG | 2.0–5.0 | 16.0 | 465 | 180 | 90515-0920 |
| For steam · Flange EN 1092 · Material: GG-25 · Control line + condensation chamber | 41-23 DN40 Flange PN16 GG | 2.0–5.0 | 20.0 | 465 | 200 | 90515-0922 |
| For steam · Flange EN 1092 · Material: GG-25 · Control line + condensation chamber | 41-23 DN50 Flange PN16 GG | 2.0–5.0 | 32.0 | 465 | 230 | 90515-0924 |
DRV7 — Direct acting (Large capacity)
The downstream steam pressure signal moves the diaphragm against an adjustable spring. Valve movement is proportional to sensed pressure; at higher flow rates, offset increases. Can also be used as a surplussing valve.
Features & benefits
- Extremely robust
- Easy to adjust
- Easy to maintain
- Can also be used as a surplussing valve
Key notes
- For steam
- Connection: Flange EN 1092
- Material body: SG iron / GGG 40.3
- Max temp: 300°C
| Description | Denomination | Bar | Kv | A | B | C | D | Part No |
|---|---|---|---|---|---|---|---|---|
| For steam · Flange EN1092 · Body: GGG-40.3 · Max temp 300°C | DRV7 DN80 Flange PN16 EN1092 GGG-40.3 | 2.0–5.0 | 92 | 310 | 528 | 168 | 202 | 90503-7784 |
| For steam · Flange EN1092 · Body: GGG-40.3 · Max temp 300°C | DRV7 DN100 Flange PN16 EN1092 GGG-40.3 | 2.0–5.0 | 145 | 350 | 633 | 168 | 237 | 90503-7785 |
DP27 — Pilot operated (Medium capacity)
The downstream pressure signal operates a pilot valve against an adjustable spring, modulating flow to the main diaphragm. This adjusts the main valve opening to maintain the desired downstream pressure with virtually no offset between no-load and full-load conditions. Can also be used as a surplussing valve.
Features & benefits
- Extremely accurate
- Easy to adjust
- Multi-pressure types
- On/off capability
- Can also be used as a surplussing valve
Key notes
- For steam and compressed air
- Connection: BSP thread or Flange EN 1092
- Material body: SG iron (GGG-40.3)
- Max temp: 232°C
- Pressure range: 0.2–17 bar
DP27 — BSP thread versions
For steam and compressed air. Connection: BSP thread.
| Description | Denomination | Bar | Kv | A | B | D | F | Part No |
|---|---|---|---|---|---|---|---|---|
| BSP thread · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 1/2 BSP GGG-40.3 | 0.2–17 | 2.8 | 160 | 185 | 406 | 130 | 90503-7774 |
| BSP thread · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 3/4 BSP GGG-40.3 | 0.2–17 | 5.5 | 160 | 185 | 406 | 130 | 90503-7775 |
| BSP thread · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 1 BSP GGG-40.3 | 0.2–17 | 8.1 | 180 | 207 | 420 | 148 | 90503-7776 |
DP27 — Flanged versions (EN 1092)
For steam and compressed air. Connection: Flange EN 1092.
| Description | Denomination | Bar | Kv | A | B | D | F | Part No |
|---|---|---|---|---|---|---|---|---|
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN15 Flange EN1092 GGG-40.3 | 0.2–17 | 2.8 | 130 | 185 | 406 | 130 | 90503-7777 |
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN20 Flange EN1092 GGG-40.3 | 0.2–17 | 5.5 | 150 | 185 | 406 | 130 | 90503-7778 |
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN25 Flange EN1092 GGG-40.3 | 0.2–17 | 8.1 | 160 | 207 | 420 | 148 | 90503-7779 |
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN32 Flange EN1092 GGG-40.3 | 0.2–17 | 12.0 | 180 | 207 | 420 | 148 | 90503-7780 |
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN40 Flange EN1092 GGG-40.3 | 0.2–17 | 17.0 | 200 | 255 | 475 | 178 | 90503-7781 |
| Flange EN1092 · Body: SG iron (GGG-40.3) · Max temp 232°C | DP27 DN50 Flange EN1092 GGG-40.3 | 0.2–17 | 28.0 | 230 | 255 | 475 | 178 | 90503-7782 |
* DP27 is a pilot-operated valve with high accuracy and virtually no offset between no-load and full-load.
BRV2, LRV2 & SRV2 — Direct acting (Low capacity)
In these direct acting low-capacity valves, the downstream pressure signal moves a set of bellows
against an adjustable spring. Valve movement is proportional to downstream pressure; the greater
the flow, the larger the offset.
BRV2 — For normal steam applications
SRV2 — For clean steam applications
LRV2 — For liquids
Features & benefits
- Extremely robust
- Easy to adjust
- Easy to maintain
- Low capacity control at equipment points
How to select among them
- BRV2: steam / compressed air (SG iron body)
- LRV2: liquids (red brass body, lower temperature rating)
- SRV2: clean steam / air (stainless steel 316L body)
- Choose thread standard and set range according to line requirements
BRV2 — Steam & compressed air reducing valve
Material: SG-iron (GGG-40.3) · Connection: Threaded ISO 7/1-Rp · Max temp: 210°C
| Description | Denomination | Bar | Kv | A | C | D | E | Part No |
|---|---|---|---|---|---|---|---|---|
| Steam & compr. air · SG iron (GGG-40.3) · ISO 7/1-Rp · Max 210°C | BRV2S DN15 ISO7/1-Rp1/2 GGG-40.3 | 1.4–4.0 | 1.5 | 83 | 60 | 130 | 25 | 90503-8198 |
| Steam & compr. air · SG iron (GGG-40.3) · ISO 7/1-Rp · Max 210°C | BRV2S DN20 ISO7/1-Rp3/4 GGG-40.3 | 0.14–1.7 | 2.5 | 96 | 60 | 130 | 25 | 6-31801 1768 1 |
| Steam & compr. air · SG iron (GGG-40.3) · ISO 7/1-Rp · Max 210°C | BRV2S DN20 ISO7/1-Rp3/4 GGG-40.3 | 1.4–4.0 | 2.5 | 96 | 60 | 130 | 25 | 6-31801 1768 2 |
LRV2 — For liquid applications
Material body: Red brass · Connection: Threaded ISO 7/1-Rp · Max temp: 75°C
| Description | Denomination | Bar | Kv | A | B | C | D | E | F | Part No |
|---|---|---|---|---|---|---|---|---|---|---|
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN15 ISO7/1-Rp1/2 Brass | 0.35–1.7 | 2.1 | 83 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 1 |
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN15 ISO7/1-Rp1/2 Brass | 1.4–4.0 | 2.1 | 83 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 4 |
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN20 ISO7/1-Rp3/4 Brass | 0.35–1.7 | 3.6 | 96 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 2 |
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN20 ISO7/1-Rp3/4 Brass | 1.4–4.0 | 3.6 | 96 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 5 |
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN25 ISO7/1-Rp1 Brass | 0.35–1.7 | 4.3 | 108 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 3 |
| Liquids · Red brass · ISO 7/1-Rp · Max 75°C | LRV2 DN25 ISO7/1-Rp1 Brass | 1.4–4.0 | 4.3 | 108 | 62 | 130 | 32 | 25 | 40 | 6-31801 9097 6 |
SRV2 — For clean steam / compressed air
Material body: 1.4404 (316L) · Connection: BSP or NPT · Max temp: 210°C
| Description | Denomination | Bar / Set range | Kv | A | C | D | E1 | E2 | Part No |
|---|---|---|---|---|---|---|---|---|---|
| Clean steam/air · 316L · BSP · Max 210°C | SRV2 DN20 ISO228/1-G3/4 SS | 0.14–1.7 | 2.5 | 96 | 62 | 130 | 25 | 15 | 6-31801 9334 1 |
| Clean steam/air · 316L · BSP · Max 210°C | SRV2 DN20 ISO228/1-G3/4 SS | 1.4–4 | 2.5 | 96 | 62 | 130 | 25 | 15 | 6-31801 9334 2 |
| Clean steam/air · 316L · BSP · Max 210°C | SRV2 DN20 ISO228/1-G3/4 SS | 3.5–8.6 | 2.5 | 96 | 62 | 130 | 25 | 15 | 6-31801 9334 3 |
| Clean steam/air · 316L · NPT | SRV2 1/2 NPT 20-60psig SS | 1.4–4 | 1.5 | 83 | 62 | 130 | 25 | 15 | 90510-3764 |
| Clean steam/air · 316L · NPT | SRV2 3/4 NPT 2-25psig SS | 0.14–1.7 | 2.5 | 96 | 62 | 130 | 25 | 15 | 90502-0019 |
| Clean steam/air · 316L · NPT | SRV2 3/4 NPT 20-60psig SS | 1.4–4 | 2.5 | 96 | 62 | 130 | 25 | 15 | 90510-3765 |
| Clean steam/air · 316L · NPT | SRV2 1 NPT 2-25psig SS | 0.14–1.7 | 3.0 | 108 | 62 | 130 | 25 | 15 | 90502-0018 |
| Clean steam/air · 316L · NPT | SRV2 1 NPT 20-60psig SS | 1.4–4 | 3.0 | 108 | 62 | 130 | 25 | 15 | 90510-3766 |
Selection guide
For correct sizing and product selection, please send the information below. We will propose the suitable reducing valve type and configuration.
Medium
Steam, compressed air, or liquid. If steam: indicate saturated/clean steam requirements.
Inlet / outlet pressure
Provide normal inlet pressure range and required downstream set pressure (bar).
Flow demand
Required flow rate and whether demand varies significantly (load profile).
Connection & size
Threaded (BSP/NPT/ISO7-Rp) or flanged EN 1092; nominal size DN / inch.
Temperature
Operating temperature (and max possible). Confirm compatibility with selected valve series.
Accuracy needs
If very stable downstream pressure is required with minimal offset, pilot-operated DP27 is preferred.
* For steam service, correct installation and condensate management are important for valve performance and lifetime.
FAQ
Quick answers to common questions about industrial pressure reducing valves.
What is the difference between direct-acting and pilot-operated reducing valves?
Direct-acting valves regulate with a spring/diaphragm or bellows directly moving the valve element. Pilot-operated valves use a pilot stage controlling the main diaphragm, achieving higher accuracy and lower offset under changing flow conditions.
Which series is best when I need very stable downstream pressure?
DP27 (pilot operated) is designed for high accuracy with virtually no offset between no-load and full-load conditions, making it a strong choice for demanding control requirements.
Can any of these be used as a surplussing valve?
DRV7 and DP27 are described as suitable for surplussing valve operation depending on system design and application. Share your target function and conditions and we will confirm the best configuration.
Which one should I use for liquids?
LRV2 is specified for liquid applications and is supplied with a red brass body and lower maximum temperature rating. Please confirm your liquid type, temperature, and pressure to validate selection.
Request a quotation & technical support
Send your application details and we will propose the correct industrial pressure reducing valve solution, including sizing guidance and part numbers.
We’ll help you select the correct reducing valve.
Please share medium (steam/air/liquid), inlet pressure range, required downstream set pressure, flow rate, temperature, and connection/size. We will respond with a technical proposal and quotation.