High purity economic autochangeover

High purity economic autochangeover


This economic Gentec semi-automatic system is designed for a continuous supply of high

purity and corrosive gases. It caters to a primary bank and a reserve bank of cylinders.

Because of the differential pressure between the primary and reserve banks, the changeover 

takes place automatically when the primary bank is depleted to provide a continuous supply

of gas from the reserve bank. In order to activate the next switchover, the regulators on both

banks need to be readjusted upon changing the cylinders. Stable pressure output is provided 

by the optional second pressure regulator on the main line.

A common application for this autochangeover is for argon gas for ICP / ICP-MS

instruments and CO2 switchover for CO2 incubators.


  • Continuous gas supply
  • Metal-to-Metal diaphragm seals
  • Pressure adjustment handle on regulator
  • Gland check valves on pigtails
  • Rear bracket mount

Typical Applications: 

  • Research laboratories
  • Gas and liquid chromatography
  • Laser gas systems
  • Purging system
  • Zero & calibration gases
  • Hydrocarbon services
  • Leak testing


  • Maximum Inlet pressure: 3000psig
  • Working temperature: -40 °F ~ 140 °F(-40 °C ~ 60 °C)
  • Pipe: 1/2” seamless stainless steel(BA grade)
  • Flow rate: see flow data chart
  • Regulator leak rate: 2 X 10-9 atm cc/sec He

Pressure Regulator Construction Materials: 

  • Body: 316L, Chrome-plated brass
  • Diaphragm, filter: 316L
  • Bonnet: 304, Chrome-plated brass
  • Seat: PCTFE
  • Stem: 316L
  • Spring: 316
Optional Components: 
  • Ball isolating valve
  • Diaphragm valve
  • Needle valve
  • Filter
  • Flash back arrestor
  • Flexible hose to connect to gas cylinders
  • Low gas alarm system

Note: Check valve must be added to the inlet of the changover to prevent gas leakage during cylinder change.

Flow curve and dimension :

Flow Data