The SML Series is an Automatic Recirculation Valve engineered in Germany and manufactured at our factory in India. Under constant supervision and following the Schroeder Valves quality standards, the smartline valve for low-pressure applications is supplied to you directly from Pune, Maharashtra.
The SML series is an Automatic Recirculation Valve designed to protect standard centrifugal pumps. It reliably prevents damage caused by dry running and low-flow operation, reducing wear and avoiding premature pump failure. The SML series is available in multiple sizes for low-pressure applications and is suitable for a wide range of media with operating tempera- tures from −50 °C to 200 °C.
The SML 10/18 series combines a smart and compact valve design with an excellent price- performance ratio. Developed for standard pump protection applications, the smartline concept focuses on operational reliability, sim- plified integration and economic efficiency. Exact competitor dimensions, e.g. Schroedahl SUL, enable straightforward 1:1 replacement without modifications to existing piping or plant layout. The result is a cost-effective up- grade path combined with proven Schroeder Valves quality and engineering expertise.
01 Bolts/Nuts
02 Pressure retaining parts SS
03 O-Ring
04 Internal parts SS
Sizing and Selection
Kv = QBv × √(SG / ΔP) Cv = 1.1561 × Kv
QBv: Required Bypass Flow Rate [m³/h]
SG: Specific Gravity
ΔP: Differential Pressure [bar]
Kv: Flow Coefficient [m³/h]
Cv: Flow Coefficient [USgpm]
Example:
- Medium: Cooling Water – SG = 0.992
- Nominal Main Flow Rate (Q100) = 153 m³/h
- Required Min. Flow Rate (QBy) = 62 m³/h
- Differential Pressure (∆P) = 32 bar
Calculation:
Kv = 62 × √ 0.992 32 = 10.92 m³/h
| Flanges acc. to ASME B16.5 | ||||||
|---|---|---|---|---|---|---|
| Size | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ |
| DN 1/2 | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ |
| DN 3 | 1″ | 1.5″ | 2″ | 3″ | 4″ | 4″ |
| L [mm] | 305 | 406 | 495 | 679 | 902 | 902 |
| H [mm] | 108 | 136 | 159 | 228 | 305 | 305 |
| S [mm] | 130 | 165 | 209 | 267 | 356 | 356 |
| Weight [kg] | ||||||
| 150 RF | 20 | 37 | 78 | 150 | 428 | 445 |
| 300 RF | 25 | 44 | 81 | 176 | 454 | 486 |
Larger sizes upon request
Features and Functions
- Valve size: 2“–10“ (larger upon request)
- Valve rating: Class 150/300
- Connection flanges: ASME B16.5 RF and EN 1092-1
- Cast housing: CF8M stainless steel
- 2-piece body design
- Internal parts: Stainless steel
- Bypass: Delta Pmax ≤ 40 bar
- Suitable for a large range of different media
- Admissible medium temperatures from –50 °C to 200 °C
- Sizing and selection according to defined and fixed staggered design-matrix for body and internal parts
- Automatic bypass flow control with modulating function
- Orifice plate, if required, only up to 20 bar delta_p in the bypass
- Check valve function for main flow
- Non-return function in the bypass branch upon request
- Stop wasting energy through continuous bypass flow, save energy with smartline!
