Improvements in or relating to fluid-flow non-return valves
1,057,132. Valves. BROOM & WADE Ltd. April 16, 1964 [April 16, 1963], No. 14926/63. Heading F2V. A check valve comprises a hollow body 11 provided internally with four coaxial annular seat members 17 located between a plate 16 and a further annular seat member 26. Each seat member has a passage...
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