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Detection valve
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Detection valve (part 8733953651) is a compact differential-pressure flow-proving device for hydronic and geothermal heat-pump systems, detecting lack of flow and triggering pump shutdown to prevent hard lockouts and equipment damage. Waterless sensing and a rugged enclosure simplify integration with Bosch hose kits, reduce fouling risk, and make the valve suitable for installers seeking reliable flow protection. I could not find Bosch documentation for PN 8733953651 on Bosch North America sites; this description is based on Bosch flow‑proving/differential‑pressure switch documentation. (bosch-homecomfort.com)
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