Griffco High-Flow Pressure Relief Valves

griffco high-flow series, pressure relief valves, diaphragm pressure valves, griffco

Griffco High-Flow diaphragm pressure relief valves are designed to protect chemical transfer systems from over pressure damage caused by defective equipment or a blockage in the chemical feed chemical feed line. Large orifice sizes facilitate high flows and higher viscosity fluids.

Wetted Materials:

  • PVC

  • CPVC

  • PP

  • PVDF

  • PTFE

  • 316 SS

  • Alloy 20

  • Hastelloy® C

Available Sizes:

1/2", 3/4" & 1" or DN 15, DN 20 & DN 25

Features & Benefits:

  • Higher flow / lower pressure drop

  • High reliability at a low cost

  • Large orifice for high-viscosity fluids

  • 2-port design

  • Vent-able to suction line

  • Solid, robust, machined construction

  • Wide range of materials

  • Flanged and socket connection options

  • Molded Noryl top with integral hardware locking

  • Composite PTFE/EPDM diaphragm

  • Multiple diaphragm material options

  • Long diaphragm life

  • Adjustable up to 150 psi (10 bar)

  • Valve sizes from 1/2" to 1" or DN 15 to DN 25

  • Tamper-resistant adjustment screw

  • High-temperature option up to 300ºF (149ºC)

Download Technical Data Sheet: Imperial (US) | Metric (International)

Sizes, Flow Capacities & Pressure Ratings
Size Maximum Flow Maximum Pressure
Pulsating Continuous
1/2" DN 15 600 2,271 30 114 250 17
3/4" DN 20 600 2,271 30 114 250 17
1" DN 25 1,000 3,785 54 204 250 17


Search This Site

(Search by Product Type i.e. Level or Brand Name i.e. Pulsafeeder)

Pumps And Related Liquid Handling Equipment

About Us

Vissers Sales Corp. is a Canadian distributor and representative for liquid handling equipment related to the Chemical/Industrial market. We specialize in all types of pumps, mixers, valves, process controls, level and flow controls.


Our Products

Vissers Sales Corp. has a wide variety of liquid handling products for the Chemical and Industrial industries. Industrial Pumps, Flow Control Systems, Instrumentation Products, Industrial Mixers, Metering Accessories, Industrial Systems, Filtration Products and Tank Container Systems from the world's leading manufacturers

Website Content

Vissers Sales Corp. provides an indepth Directory of Industrial Pumps featuring Centrifugal Pumps, Positive Displacement Pumps, Drum Pumps, Metering Pumps, Tote Pumps from the world's leading manufacturers available at Vissers Sales Corp.. We offer a wide variety of products to meet your unique needs.

Get in Touch

  • Phone:
  • Email:
    Email Us Here
  • Address:
    20-220 Industrial Parkway South
    Aurora, ON L4G 3V6
  • Website: