hello
Would anyone be kind enough to help me with an in depth study of a demand valve which i am currently carrying out for my A level product design course. I chose this topic as I love diving and thought i would be a great opertunity for me to learn even more about the equipment i use which we rely, however i have found it very hard to find the information i need to acheive the highest marks. If you have any information what so ever about the materials, manufacture and/or enviromental issues or just have any info you think would be use full to me i would be very gratefull.
Thank you very much
Hannah
Help please :) 
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