Diaphragm Valves For Slurries and Debris-Laden Fluids

Hayward’s diaphragm valves are available in PVC, CPVC, PP (polypropylene) and PVDF materials and typically used for controlling flow of slurries and fluids that have a high percentage of particulate.


  • Very precise control

  • Simple sealing method

  • No liquid hold-up

  • Few parts to replace or maintain

  • FPM, EPDM and PTFE diaphragms with FPM or EPDM seals

The reason diaphragms valves are usually used for fluids containing particulate is because when compared to ball and butterfly valves they have a lower Cv value (higher pressure drop, because they aren't a full port design), actuation is more complex and they are more expensive.  Therefore, diaphragm valves are used when ball and butterfly valves aren't the best choice.

Cutaway View of a Hayward Diaphragm Valve

Cutaway view of a Hayward diaphragm valveSome of the advantages that the Hayward® brand offers are:

  • Beacon style position indicator

  • Socket, threaded and flanged connections

  • True-Union design

  • Optional PVDF vapor barrier

  • Actuation either electrically or pneumatically

Additional Resources

  • Download Hayward’s complete Engineering Product Guide for additional selection criteria, such as flow coefficient values, water hammer calculations and other technical formulas.

  • Use the navigation menu above to compare pricing, note the part number and call, email or fax your order!


Threaded connections are NPT (American Standard) tapered pipe threads and it is suggested that a non-petroleum based sealant such as PTFE (Teflon™) plumbers tape is applied to your inlet/outlet pipe connections.

Flanged connections conform to ANSI 150# dimensions and a 1/8” thick full face gasket having a durometer rating between 50 and 70 is required for proper sealing for models that do not have a integral flange o-ring.

If you are not sure which diaphragm valve is most appropriate for your application, send us an inquiry, we typically reply quickly, certainly within 24 hours.