Back Pressure Valves

• CNC precision machined parts
• Cost effective and reliable
• Pressures from 8-150 psi (350 optional)
• Variety of materials available
• Anti-syphon protection
• Fine pressure 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 diaphragm held in place by a spring which is pressure set. When the pressure is exceeded the PTFE 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.

Pressure Relief Valves

• Fine pressure 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 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 field adjustable.