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Valves & Actuation

Manual Plastic Diaphragm Valves

Type-14 True Union Diaphragm Valve (1/2" – 2")

The type-14 diaphragm valve has been specified with confidence since 2002. Design features include industry-leading body-to-bonnet sealing performance isolating the bonnet components from the media, high visibility position indication with built-in travel stop providing visual confirmation while minimizing compressive strain across the diaphragm, and smooth ergonomic handle operation. Bubble-tight sealing can be achieved even in tough applications containing suspended particles or slurries. Controlled flow characteristics are achieved by way of an internal weir design, requiring fluid to flow over the raised center section of the body where the body and diaphragm meet. The molded thermoplastic valve body diaphragm and end connector O-rings are the only components in contact with the media.

Asahi's type-14 diaphragm valve features a three-layer EPDM/PVDF/PTFE diaphragm providing a gas barrier protecting the bonnet internals from aggressive off-gassing chemicals such as sodium hypochlorite. The Type-14 true-union diaphragm valve provides union end connections for simplified installation and maintenance. End connector O-rings are matched to diaphragm materials for ultimate chemical compatibility.

For maximum corrosion resistance, the type-14 diaphragm valve's body and bonnet are manufactured from solid thermoplastic materials. The type-14 diaphragm valve can be pneumatically or electrically actuated.


Data Sheets


Ideal Applications Include:

Throttling, slurry lines, chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, semiconductor manufacturing



1/2" – 2"

Body Materials:


Bonnet Materials:


End Connectors:

PVC, CPVC: IPS Socket or threaded
PP, PVDF: IPS & metric (DIN) Socket, threaded, butt


EPDM and three-layer EPDM/PVDF/PTFE
Also available in Nitrile and FKM




  • Bubble tight sealing even in applications such as slurries or suspended particles, bonnet seals to protect internals from corrosive environments, built-in travel stop to prevent over-tightening or compressive strain on diaphragm, position indicator at top of valve, PVDF gas barrier (protects EPDM backing from gas permeation) standard on all valve with PTFE diaphragm.
  • True union design permits installation or repairs without expanding pipeline
  • Rugged-square body and bonnet are of solid thermoplastic for maximum corrosion resistance
  • Uniquely designed body and bonnet together with diaphragms of new sealing designs by the state-of-the-art computer aided analysis for superior sealing
  • Weir design for excellent throttling
  • Full-vacuum rated
  • Bonnet seals to protect internals from corrosive environments
  • Adjustable travel stop to prevent diaphragm from being over-tightened
  • Bayonet structure to connect compressor and diaphragm for quick maintenance
  • Integrally molded bottom stand for simple yet firm panel mounting
  • Indicator at the top for valve position
  • PVDF gas barrier, which protects EPDM backing cushion from gas permeation, is standard for all valves with PTFE diaphragm
  • Low profile