Back Pressure / Relief Valves – Chemline Plastics

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 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 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″ – 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

Technical

Data Page for SB10 and SB11 Series HypoValve (PDF)

Data Page for SB12 Series (PDF)

Data Page for SB17 Series (PDF)

Installation and Maintenance Manual (PDF)

Data Page for SB18 Series (PDF)

Notice! (PDF)

Options

Pressure Gauges

ChemFlare Ends


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