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  • ...g, or partially obstructing various passageways. Valves are technically [[Piping and plumbing fittings|fittings]], but are usually discussed as a separate c ...especially in chemical or power plants, are schematically represented in [[piping and instrumentation diagram]]s. In such diagrams, different types of valve
    25 KB (3,845 words) - 17:33, 8 August 2019