| http://www.w3.org/ns/prov#value | - The upper end of the main portion of the stem 43 is threaded at 59 for engagement of the threaded aperture 42 of the plug In operation, the gas or other fluid passes into-the casing 5 through the connection 6 and thence through the main valve port 8, the port 11 serving by the outlet pressure in said case to oppose the downward movement .of the diaphragm 16 and valve. \Vhen however, pressure on th
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