Series VBM
Self-Closing Thermoplastic Vacuum Breaker is normally closed, self-sealing, independent of gravity and reverse flow and installable in any position. The body material shall be [PVC or Corzan® CPVC or Polypropylene or Kynar® PVDF] and the diaphragm material shall be [EPDM or Viton or Buna]. Diaphragm shall automatically reposition itself against the seat in the identical position. Vacuum Breaker will begin to break vacuum at approximately 2 inches of Mercury (1.0 psi or 0.07 Bar negative pressure) and will be of size [½" or ¾" or 1"] with [NPTF threaded or socket] connection. Integral to the design a union nut will be provided for ease of inspection and removal. All units to be 100% individually tested at the factory. As manufactured by Plast-O-Matic Valves Inc., Cedar Grove, NJ.
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