Back Pressure/Relief Valves
|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|
SB Series Back Pressure Relief Valves
Chemline’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 Work
Chemline 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.
SB11 HypoValve for Sodium Hypochlorite
Chemline’s SB11 Back Pressure/Relief HypoValve with PVC body, FPM (Viton) seals and Chemflare™ end connections is our proofed solution for sodium hypochlorite applications. This valve provides a long term, maintenance-free solution, with easy installation and the ability to handle lower quality sodium hypochlorite applications where there may be solids in the service. Our Chemflare™ end connection allows for a reliable, leak-free, corrosion resistant union to a PFA delivery system while still using PVC valves. Removing all possible solvent cemented joints is the only way to guarantee a leak-free sodium hypochlorite system. Our SB11 HypoValve with Chemflare™ end connections and compression fittings have no threaded seal surfaces and can easily withstand pulsing flows.
The SB10/11 Series is very sensitive to pressure changes and requires low overpressure to fully open. It is designed for clean fluids only.
The SB12 Series has a built-in check valve function, desirable for dosing applications. It is not so sensitive as to open with every pulsation from a metering pump. It is designed for clean fluids only.
The SB18 Series is recommended for dosing applications. It is not so sensitive as to open with every pulsation from a metering pump.
✓ Choice of PVC, Polypropylene or PVDF constructionWill handle a wide range of chemical applications and temperatures up to 100C (212 deg. F).
✓ Designed for superior PerformanceHigh flow rates vs. overpressures
Low hysteresis (“backlash”)
Long Cycle life
✓ True Union ends up to 2”Easy Installation and maintenance
Leaky threads eliminated
✓ Sizes up to 4”
Back Pressure/Relief Valve Selection
|Model||Sizes||True Union||ChemFlare||Set pressure Range||Size||Major Features|
|SB17||1/4″ – 3/8″||Yes||3/8″||7.5 to 150 psi||mini||fits tight spaces|
|SB10||3/8″ – 1″||Yes||Yes||3 to 60 psi||medium||best for sodium hypochlorite service|
|SB11||3/8″ – 1″||Yes||Yes||7 to 150 psi||medium||best for sodium hypochlorite service|
|SB12||3/8″ – 2″||Yes||3/8″ – 1″||5 to 150 psi||medium||built-in check function, unchanging opening pressure|
|SB12||2-1/2″-3″||–||no||7.5 to 150 psi||large||built-in check function, unchanging opening pressure|
|SB12||4″||–||no||7.5 to 90 psi||large||built-in check function, unchanging opening pressure|
|SB18||3/8″ – 2″||Yes||3/8″ – 1″||7.5 to 150 psi||medium||recommended for dosing – not too sensitive|