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CSM-81-F Watts

Flow Measurement Valves

Series CSM-81-F Flow Measurement Valves monitor system flow in medium to high flow rate HVAC units providing a highly accurate flow measurement. It consists of a semi-steel body construction with a low-torque cylindrical plug design, flanged end connections, checked metering ports with drip caps, position indicator plate, positive shutoff, and two brass pressure taps. Series CSM-81-F is ideal in hot/chilled water units such as, fan coil units, water source heat pumps, reheat coils, panel coils, branch lines, and pumps. Maximum Working Pressure: 175psi (12 bar).


  • Accurate flow measurement for use in multiple applications
  • Positive shut off eliminates need for a separate service valve
  • Designed for long service life
  • Easily accessible checked metering ports facilitate balancing and flow measurement

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific CSM-81-F