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| Series: | SB |
| Inlet Connection: | 1/4″- 4″ |
| Instrument Connection: | True Union Socket, Threaded or ChemFlare, Spigot Bodies with Plain, Socket, Threaded or Flanges |
| Diaphragm: | PTFE Bonded EPDM |
| Seats/Seals: | EPDM, FPM |
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Description
SB Series Back Pressure Relief ValvesChemline’s SB Series back pressure relief valves are designed for long maintenance-free life. They are designed for superior performance in dosing systems. Different models are available. Each has advantages for different applications. How they WorkChemline SB Series Back Pressure/Relief Valves have two functions: as a back pressure valve, installed in-line downstream of a pump, the back pressure below the metering pump is maintained. When installed in the branch of a tee they are pressure relief valves. The valves stays closed until inlet pressure reaches the set pressure which is adjusted by turning the spring tensioning bolt. Inlet pressure acts against a PTFE bonded diaphragm, opening the seat to allow flow until the inlet pressure again equals the set pressure. |
✓ Choice of PVC, Polypropylene or PVDF construction
Will handle a wide range of chemical applications and temperatures up to 100C (212 deg. F).
✓ Designed for superior Performance
High flow rates vs. overpressuresLow hysteresis (“backlash”) No chatter Long Cycle life
✓ True Union ends up to 2”
Easy Installation and maintenanceLeaky threads eliminated
✓ Sizes up to 4”
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Back Pressure/Relief Valve Selection
| Model | Sizes | True Union | ChemFlare | Set pressure Range | Size | Price Value | Major Features |
| SB17 | 1/4″ – 3/8″ | Yes | 3/8″ | 7.5 to 150 psi | mini | good | fits tight spaces |
| SB12 | 3/8″ – 2″ | Yes | 3/8″ – 1″ | 5 to 150 psi | medium | good | built-in check function, unchanging opening pressure |
| SB12 | 2-1/2″-3″ | – | no | 7.5 to 150 psi | large | good | built-in check function, unchanging opening pressure |
| SB12 | 4″ | – | no | 7.5 to 90 psi | large | good | built-in check function, unchanging opening pressure |
| SB18 | 3/8″ – 2″ | Yes | 3/8″ – 1″ | 7.5 to 150 psi | medium | best | recommended for dosing – not too sensitive |
Technical
Data Page for SB10 and SB11 Series (PDF)
Data Page for SB12 Series (PDF)
Data Page for SB17 Series (PDF)
Installation and Maintenance Manual (PDF)
