The valve fits in the oxygen line between a cannula and extension hose. It lets user adjust the flow without going back to the concentrator. Because each valve is modified to fit user's needs, minimum and maximum flow rates must be provided when placing an order. 

When the valve is fully opened (handle paralleled with valve's body) user gets the flow that is set on his/her concentrator. Turning the handle until it is perpendicular to valve's body reduces the flow to specified minimum flow rate.

Normally, each valve can only be turned down to the specified minimum flow rate (min.) and turned up to what set on user's concentrator (max.), user can learn how far to turn handle to get a flow in between min and max flow rates. 

 

A Flow Control Valve can be attached to the end of any cannula. A photo of valve attached to a C-0 cannula is shown here. Please note that a valve attached to a cannula longer than 4 ft. will end up on the floor and dragged around the house. For this reason, valve is not expected to last long.  

Some humidifiers have a built-in alarm that squeals if pressure inside tubing exceeds the pressure set by manufacturer.  This set up may not work for you. 

This valve will not work with portable concentrators and most liquid oxygen. A simple test would be to restrict oxygen by almost blocking the outlet.

 

Operating instructions

1. Connect the valve between cannula and extension hose. Make certain that the valve's handle is parallel with its body.

2. Set the concentrator at the highest flow you expect to use.

3. Turn the handle until marks lined up. Watch the flow meter as the valve is moved. There will be a delayed reaction but eventually user should see the flow rate be his/her prescribed minimum flow rate.