| http://www.w3.org/ns/prov#value | - In one form, valve member 126 is generally disk-shaped with the disk-shaped valve member 126 comprised of a disk-shaped member 128 formed of compliant material, such as rubbers or thermoplastic elastomers or silicone, and a stiffening element 130 which is desirably integrally formed with disk member 128 or otherwise secured in permanent or semi-permanent fashion with disk member 128 such as by an
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