Douglas Bag Parts & Accessories

Mouthpieces are included in the Douglas bag sets, but are also available individually. Spring clips and plugs can also be purchased separately.

50-0975 One-Way Air-Valve
The One-Way Air Valve is controlled by inspiration and expiration; one valve opens and the other closes on inspiration, and vice versa on expiration. The gas stream can flow in only one direction. The Valves consist of thin mica discs mounted in a cast plastic frame. The mica disc is held in the center of the frame by a nickel-plated brass threaded shank that has a soft stainless steel spring mounted on it. The mica disc moves against this soft spring and opens with the slightest positive pressure. The hose connectors are made of tapered plastic and have a groove at the top. A 50-1015 Sealing Ring seats in this groove and effectively locks and seals the Tubing to the Valve.

50-1029 Tubing Valve
The Single Channel Tubing Valve with two 115 mm (4-1/2 in) diameter, aluminum alloy sections held against each other by a bolt with a heavy spring. A thick polythene washer between the valve sections makes their junction gas-tight and provides an appropriate surface on which they can rotate. The desired connections can be made by rotating the valve sections against each other to the stops provided.

The valve allows the subject to be connected to the atmosphere while they regulates their breathing. By rotating the aluminum alloy sections, the single channel valve provides a direct connection to a single Douglas bag. The change-over valve allows a direct connection to either Douglas bag A or Douglas bag B.