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SigmaMotor Inc.





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Chemical Feed > Valves

Sigmamotor pressure relief valvesBack Pressure Valves
  • CNC precision machined parts
  • Cost effective and reliable
  • Pressures from 5-150 psi (350 optional)
  • Variety of materials available
  • Anti-syphon
  • Fine adjustment
  • Optional air release and gauge port


Sigmamotor back pressure valves prevent siphoning and varying rates of dosage from fluctuating downstream pressure by enacting positive discharge pressure in your metering pump system.

Inside the valve is a PTFE diaphragm held in place by a spring which is pressure set. When the pressure is exceeded the diaphragm is pushed up and material flows through the valve to the injection point. The valves are set at 50psi but are easily adjusted in the field.

Sigmamotor Pressure Relief ValvesPressure Relief Valves

  • Fine adjustment
  • CNC precision machined parts
  • Cost effective and reliable
  • Variety of materials available
  • Right angle, 3-port design

Sigmamotor pressure relief valves operate when the system pressure raises above the set pressure of the valve to protect systems from damage due to blockages or excessive pressure situations.

Inside the valve a spring holds a diaphragm against the valve seat until preset pressure is exceeded, then the PTFE diaphragm is forced up and the material in the system is forced out of the relief port. The valve is set at 65psi at the factory but is easily reset at your site.


Typical System Block Diagram

Sigmamotor chemical feed system

Back Pressure and Pressure Relief Valve
Specifications and Dimensions


Available Sizes (in.) 1/4, 3/8, 1/2, 3/4, 1, 1-1/2, & 2
Pressure Range (PSI) 5-150 (50-350 available on metal valves)
Flow Range @150 PSI
Pulsating
US GPH
Continuous
US GPM
1/4", 3/8" & 1/2"
up to 350
up to 17.5
3/4" & 1"
up to 600
up to 30

1-1/2"

1350
67
2"
up to 2000
100
Maximum Temperature Plastic: 140° F
Metal: 300° F
Material (Valve Top) PVC, 316 S.S. or CPVC
Material (Valve Body) PVC, CPVC, PP, PTFE, PVDF, 316 S.S., A20, or Hastelloy C


Sigmamotor pressure relief valve

Size (NPT)
A
B Dia.
C
1/4" to 1/2"
4.25"
2.375"
1.125"
1/2" to 1"
5.75
3.5"
1.25"
1-1/2"
9"
4.5"
2.125"
2"
9"
5"
2.125"

 

   
   

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