Manual and Actuated Diaphragm Valves

Manual diaphragm valves are ideal for flow control by offering a variable and precise opening for controlling pressure drop through the valve.  Diaphragm valves are also ideal for slurry service and offer positive closing. 

Actuated diaphragm valves can offer features as adjustable opening, positioners for precise flow control, and electric relay of valve position.

Plast-O-Matic Valves

1/4" NPT to 1 1/2" FNPT -- PVC, polypro, PVDF, Teflon
BSD Series Diaphragm Valves Miniature Air Operated

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+GF+  George Fisher

Manual - Type 514 / 315

  • 1/2" through 2"
  • PVC, CPVC, Polypro or PVDF
  • EPDM or PTFE diaphragm
  • Visual position indicator
  • Optional Locking handwheel  - additional details

Manual - Type 317

  • 2 1/2" through 6" - Flanged
  • PVC, CPVC, Polypro or PVDF
  • EPDM or Teflon diaphragm are standard
  • Visual position indicator
  • Optional Locking handwheel
  • NBR, Nitrate, CSM, Hypalon or Viton   diaphragm options - additional details

Automated - DiaStar 10 and 16 - Normally Closed, Normally Open or Double Acting (air x air)

  • 1/2" through 2" - True Union Socket or Flanged - additional details
  • PVC, CPVC, Polypro or PVDF
  • EPDM or Teflon  diaphragm
  • Standard with position indicator
  • New High Flow design - lower Cv

Automated - Type 025 - Normally Closed, Normally Open or Double Acting (air x air)GF-diaph.jpg (4897 bytes)

  • 2 1/2" through 6" - Flanged - additional details
  • PVC, CPVC, Polypro or PVDF
  • EPDM or PTFE Teflon diaphragm

Options for all of the above include: position indicator, manual over ride, stroke limiter, limit switches, electro-pneumatic positioner or controller.  Contact KTH Sales for details regarding options and controller.

Index for George Fischer


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Type 677 above

Type 677 Manual diaphragm valves
  • 1/2" through 4" - True Union (Socket or Threaded), spigot or Flanged
  • PVC, CPVC , polypropylene or PVDF
  • EPDM, Viton  or PTFE Teflon   diaphragm
  • Options include locking handle

Automated Type 610 - Compact Design - NC, NO or Double Acting

  • 3/8" or 1/2" FNPT
  • PVC, polypropylene or PVDF
  • EPDM, Viton  or PTFE Teflon   diaphragm
Type 690 below
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Automated Type 647 - Air to close - Liquid pressure to open
  • 1/2" through 2" - True Union (Socket or Threaded), spigot or Flanged
  • PVC, CPVC or polypropylene
  • EPDM, Viton or PTFE Teflon diaphragm

Automated Type 690 - Normally Closed, Normally Open or Double Acting (air x air)

  • 1/2" through 4" - True Union (Socket or Threaded), spigot or Flanged
  • PVC, CPVC , polypropylene or PVDF
  • EPDM, Viton or PTFE Teflon diaphragm
  • Options include: position indicator, manual over ride, stroke limiter, limit switches, electro-pneumatic positioner or controller.  Contact KTH Sales for details regarding options and controller.
GEMU manufacturers valves similar to the above with materials of construction of brass, cast iron, stainless steel (316 and 316L), steel lined with polypro or PFA.   Most can be made for sanitary or bio-technical services.  Contact KTH Sales for details.  - Index for GEMU Valves

Air Pilot Valves for above - Brass construction with manual over ride and DIN connector.  Available in direct mounting to valve or manifold configurations.


Spears Manufacturing

Manual diaphragm valvesdiaphragm.jpg (3327 bytes)

  • 1/2" through 2" - True Union (Socket or Threaded)
  • PVC, CPVC
  • EPDM or Viton O-ring seal Union connections
  • EPDM, Viton or PTFE Teflon diaphragm
  • Clear-view indicator for valve position
  • Polypropylene handwheel
  • Mounting holes provided

Spears Index


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Viton and Hypalon are registered trademarks of DuPont Dow Elastomers.  Teflon is a registered trademark of DuPont.