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A Single Direction Non-Return (SDNR) valve so that if feed pump stops the boiler water will be prevented from blowing out the boiler. The main check is often fitted to the inlet flange of the economizer if no economizer fitted then directly connected to the boiler. The Auxiliary feed check is generally fitted directly to an inlet flange to the drum with crossovers to the main feed line. Usually fitted with extended spindles to allow remote operation which must have an indicator fitted.

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