Mô tả


Reflux 919 by Pietro Fiorentini is a control diaphragm valve especially designed for natural gas or other preliminarily filtered non-corrosive gases. It may be supplied in the direct-action (air to close), or in the reverse action type (air to open).

This device is mainly used in high-pressure transmission systems and in medium pressure gas distribution networks.


  • Design pressure: up to 102 bar
  • Design temperature: from -20 °C to +60 °C
  • Rangeability: up to 1:1000
  • Nominal sizes DN: up to 10″
  • Connections: Class 150, 300, 600 RF or RTJ according to ASME B16.5 and PN16 according to ISO 7005
  • End to end dimensions: according to EN 334