Attention:

Certain features of sigmaaldrich.com will be down for maintenance Saturday afternoon/evening, February 24th starting at 3:00 pm CT until 9:00 pm CT.

Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Shutoff Valves

The flow of gas through a delivery system must occassionally be stopped for various reasons, such as during the changeout of spent purifiers, or during routine instrument maintenance. To prevent the infusion of room air into the delivery system, it is recommended to install a shuttoff valve:

  • Directly downstream of gas cylinders and/or gas generators
  • Direct upstream and directly downstream of purifiers
  • Directly upstream of the instrumentation

Three types of shuttoff valves are offered: on/off toggle type, on/off ball type, and knob diaphragm type.