Compact valves for corrosive and ultra-pure liquids in PVC, PTFE, Kynar® & Polypropylene

Series BSDA: 

The miniature air-operated diaphragm valve that performs like a heavyweight. Designed for pressure and drain applications with highly corrosive or ultra-pure liquid systems when space is critical. The valve is ideal for a broad range of industrial applications, from electronic to chemical plants, commercial laundries, car wash operations, etc.

For applications with ultra-pure water and concentrated etchants, such as in the semi-conductor industry, it provides the ultimate in non-leaching, contamination-free sealing. The standard valves are air pressure to open with spring return to close (0-100 PSI). There is no minimum inlet pressure required. Other options are available. Not designed for Chlorine.

This valve design serves many functions:

  • Unique PTFE wetted diaphragm provides the ultimate in purity and chemical resistance.
  • Compact - light in weight.
  • Can be mounted in any position.
  • Normally-closed design provides bubble-tight shut off in the event of air or electrical failure.
  • Patented Fail-Dry® safety design warns of seal failure; permits valve to continue operating.
  • Million-cycle, non-sticking design.

And provides many outstanding features:

  • Compact size with PTFE diaphragm construction.
  • No metal in contact with liquid.
  • Various end connections available.
  • Million cycle non-sticking design.
  • Various body materials available: 
    Geon® PVC, Corzan® CPVC, PTFE, Kynar® PVDF, Natural unpigmented Polypropylene.
  • Normally closed design ("fail-safe" spring to close; air to open).
  • Patented FailDry® vented design.
  • Inlet pressures to 100 PSI.

Back to the directory

25 Years Anniversary

Chem Resist is currently celebrating a milestone

It's 25 years since Chem Resist started production of spiral wound thermoplastic storage tanks. Here's to many more years of innovation in this sector...

Find out more...

Our latest news

Read the latest Chem Resist news...

There's always a lot going on at Chem Resist:
> Read the latest Process Plant news here
> The latest Fluid Transfer updates are here.

Case studies

Our Process Plant division has put together a case study library

Find out how Chem Resist Process Plant products have been used in a wide variety of industrial applications.

Find out more...