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- Model Series BSDA/BSDAM - Air-Operated ...
Model Series BSDA/BSDAM -Air-Operated Shut-Off Valves with PTFE Diaphragm
Compact valves for corrosive and ultra-pure liquids in Geon® PVC, Corzan® CPVC, PTFE, Kynar® PVDF & Natural Polypropylene ¼` through 1½` sizes.
- 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 Fail-Dry® vented design.
- Inlet pressures to 100 PSI.
Designed for pressure and drain applications processing ultra pure water and highly corrosive chemicals. The valve is ideal for a wide range of uses, from pharmaceutical to semiconductor in PTFE, Kynar PVDF or Polypro body materials; car washes to chemical plants in the lower-cost Geon PVC body materials, and higher temperatures in those applications with Corzan CPVC bodies.
For high purity applications such as deionized water, Series BSDA/BSDAM provides the ultimate in non-leaching, contamination-free sealing. The standard valves are air pressure to open, with "fail safe" spring return to close. Because the diaphragm is attached to the piston, no inlet pressure is required to assist with opening. The BSDA/BSDAM is not designed for vacuum service.
Discontinued Series BSD was an earlier design with a non-attached diaphragm. Series BSDA and former Series BSD are identical in all other respects. Series BSDA supersedes Series BSD.
New Series BSDAM is a molded body with molded integral mounting lugs and an optional gauge port. Series BSDA and BSDAM are identical in all other respects.
Diaphragm Design
The standard diaphragm material is PTFE for the ultimate in purity, backed with FKM for the ultimate in strength and flexibility. The FKM side is not in contact with liquid.
Materials of Construction
Wetted body materials available standard are Geon® PVC, Corzan® CPVC, PTFE, Kynar® PVDF, and Natural Unpigmented Polypropylene. Other body materials and custom materials may be available, depending on costs and/or quantity.
Compact air cylinder head standard material is Geon PVC, regardless of the body material. Seals used for cylinder are Buna-N. Spring is steel; fasteners are stainless steel. None of these materials contact liquid. If for some reason these are not acceptable for your application, other air section materials can be provided depending on costs and/or quantity. We urge you to contact our Technical Group at (973) 256-3000 to discuss your application.
Mounting
1/2" size in PVC, CPVC, Natural Polypro & Kynar PVDF (Series BSDAM) have integral mounting lugs on the base of the body, as shown at right. All other sizes & materials have threaded mounting holes in the base.
Gauge Ports & Fail Dry Port
1/2" size in PVC, CPVC, Natural Polypro & Kynar PVDF have opposing 1/8" NPT gauge ports on the side of the body, on the same plane as the piping connections, as shown at right. The gauge ports are not tapped unless so ordered; incurs small charge. On the standard body, the untapped port has no effect on flow or performance. Gauge ports are not readily available on other sizes or on 1/2" PTFE body; please consult factory for alternatives. The threaded port above the piping connection is the patented Fail-Dry early warning vent. Fail-Dry is standard on all sizes and materials.
Applications
Series BSDA/BSDAM PTFE diaphragm valves have been used successfully in Semiconductor fabs, pharmaceutical processing, deionized water, chemical processing, potable water treatment, chemical injection systems, battery filling, wastewater treatment, dialysis systems, and many other applications since it was introduced in 1984. This is a proven design for high purity processes, providing 1,000,000 cycles in normal use.