Back Pressure/Relief Valves – SB Series
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 is our proven solution for sodium hypochlorite applications. Our valve provides a long term, maintenance-free service, and the ability to operate with lower quality chemical where other valves fail. Depending on your system design, we offer both ChemFlare™ end connections with PFA tube and fittings for flexible systems and ECTFE (Halar) butt fusion ends and piping for rigid systems.
The valve’s True Union design means easy installation and will provide a reliable, leak-free mechanical connection of the PVC valve to your PFA or ECTFE (Halar) delivery system. Removing all PVC solvent cemented joints is the only way to guarantee a leak-free sodium hypochlorite system.
The SB10/11 Series is very sensitive to pressure changes and requires low over pressure 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 SB17 Mini Series offers high performance in a compact package.
The SB18 Series is recommended for dosing applications. It is not so sensitive as to open with every pulsation from a metering pump.
Suited for sodium hypochlorite applications
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Size:SB10/11: 1/2" to 1"
SB12: 3/8" to 4"
SB17: 1/4" to 3/8"
SB18: 3/8" to 2" -
Ends:True Union Socket: Threaded or ChemFlare™
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Spigot Bodies:Plain, Socket, Threaded, Flanged
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Body:PVC, PP, PVDF
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Seals:EPDM, FKM (Viton®)
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Diaphragm:PTFE Bonded EPDM
Features & Benefits
- True Union Ends
Easy installation and maintenance. - Long Cycling Life
Dynamic seal is PTFE bonded EPDM for high chemical resistance.
This moulded diaphragm is designed for superior sealing and flex life. - Superior Performance in Dosing Systems
Valves are hydraulically designed for very low hysteresis (“backlash”) and to eliminate chatter.
Built-in check (non-return) function.
Valve opening depends on inlet pressure only and is uneffected by changes in downstream (back) pressure. - Set Pressure Ranges
1/2” to 2”: 5 to 150 psi.
2-1/2” and 3”: 7.5 to 150 psi.
2-1/2” to 4”: 5 to 60 psi (optional).
4”: 7.5 to 90 psi. - Maximum Viscosity
120cP is maximum recommended service viscosity.
Commonly used in these markets
Environmental
Process Industrial
Chemical, Storage & Transport
High Purity Water
Valve Specification Guide
Engineering specifications are crucial as they provide precision, clarity, quality assurance and compliance in your projects. Download to save you time and assure accuracy in your specifications.
Chemical Resistance Guide
Corrosion resistance is an important factor in selecting the right material of construction for valves, pipe, tubing, fittings and more. Designed to easily navigate, this guide can be downloaded for easy reference.
Materials of Construction
Understanding materials of construction is essential to the accurate selection of valves, pipe, tubing, fittings and more. Designed to easily navigate, this guide can be downloaded for easy reference.
