Back Pressure/Relief Valves

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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, FKM (Viton®)
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Description

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 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 SM17 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.

✓ 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. overpressures
Low hysteresis (“backlash”)
No chatter
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″ – 4″ 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

Technical

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