A new line of diaphragm style back pressure valves and pressure relief valves named TOP VALVE, has been introduced. New features include a completely adjustable pressure range of 15-150 PSIG* and a built-in air release to reduce priming difficulties with metering pumps.

     TOP VALVE Back Pressure Valves and Pressure Relief Valves are available in seven sizes, 1/4" through 2" NPT and eight (8) materials of wetted construction. The seat design of this new line of valves greatly extends the normal life expectancy of the diaphragm.


Flanged Valve TOP VALVE Series: (Plastic)


This series incorporates 150# socket-welded flanges on PVC and CPVC valves and threaded 150# companion flanges on polypropylene, PVDF and PTFE valves.

Flange sizes from 1/4” to 2” available.


Flanged TOP VALVE Series: (Metallic Valve Bodies)


This series incorporates 150# weld neck flanges on all
metallic valve bodies. Valve top material available in PVC,
CPVC (Corzan).

These flanged valves are also available in the High Temperature and High Pressure Series.


Flanged TOP VALVE Series: (All Metallic)


This series incorporates either an aluminum or 316 stainless steel top on a metallic body constructed of 316L, Alloy 20, Hastelloy C or titanium.

These flanged valves are also available in the High Temperature and High Pressure Series.


High Pressure TOP VALVE Series (only available with metallic body)


  • Pressure range 50 to 350 PSIG
  • This series incorporates a standard aluminum metallic top, viton diaphragm, high pressure spring with three standard choices of metallic wetted bottom
  • Standard body materials available are 316L stainless steel, Alloy 20 or
    Hastelloy C; other metallic bodies available on request
  • Standard metallic top is aluminum with optional 316L stainless material available
  • Standard diaphragm material is Viton with optional materials available
  • Valve is available in three styles: BH back pressure 2 port design;
    PH pressure relief 3 port in-line design; P2H pressure relief off-line design
  • Valves available in various configurations that include threaded, socket and flanged.