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Piloted-to-Open Check Valves, sandwich module


Pilot operated check valves in sandwich plate design

Models Z2S are pilot operated check valves in a sandwich plate design. They provide line contact closure in one or two actuator ports, even during idle periods. Piloted to open, utilizing a pressure signal from the opposite actuator port provides a self-contained function.


  • Sizes 6 to 22
  • Porting pattern according to ISO 4401-3, 5, 7, 8; NFPA T3.5.1M R1, and ANSI B93.7 D 03, D 05, D 07, D 08
  • For the leak-free isolation of one or two actuator ports
  • Various cracking pressures