One in 8 victims refused to return the demand valve, however, donating a regulator rarely results in the donor becoming the victim.
22.
This would normally be pressurised but with a closed valve, so that current pressure on the demand valve will not cause a free flow.
23.
Many divers fit a second demand valve, often called an " octopus ", to their diving regulators, for emergency use by another diver.
24.
In most regulator designs the diver will have to overcome a larger cracking pressure to open the demand valve, and flow rate will be reduced.
25.
In twin hose regulators the demand valve is included in the body of the regulator which is usually attached directly to the cylinder valve or manifold outlet.
26.
The Emerson and Pulmotor were utilized until the mid-1960s, when a breakthrough in the history of oxygen delivery was made : the demand valve.
27.
The donor should retain a good grip on the demand valve throughout the buddy breathing process, as a panicked recipient may fail to give it back.
28.
A reasonably reliable way of keeping control of the demand valve is to grasp the hose firmly in the fist where it connects to the demand valve.
29.
A reasonably reliable way of keeping control of the demand valve is to grasp the hose firmly in the fist where it connects to the demand valve.
30.
The first recorded demand valve was invented in 1838 in France and forgotten in the next few years; another workable demand valve was not invented until 1860.
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