The Watts CSM-KNOB is a lead-free manual circuit balancing valve. It features a lead-free bronze body and a fkm (viton) seat. This model is certified lead-free for potable-water installations.
This knob is designed for 1/2 to 1 inch flow measurement valve, series LFCSM-61-S.
Common Questions
- Do I need a separate meter to read the flow?
- Yes. The CSM-KNOB is a differential-pressure device: it meters through dual PT (pressure/temperature) ports with checked drip caps. You connect a balancing meter (or a differential gauge) across the two ports, read the pressure drop, and convert it to GPM using the Watts flow chart for the body. The valve does not display flow on its own. If you want set-and-read balancing without a meter, use the Watts iDROSET CSD direct-reading series instead.
- Can it also shut off the circuit?
- Yes. The CSM-KNOB gives positive, drip-tight shutoff, so it doubles as the service valve for the circuit and you do not have to buy and install a separate ball valve next to it. The memory stop preserves your balanced setting: close the valve for service, reopen it against the stop, and the circuit returns to the same flow without rebalancing.
- Can I use it on a domestic hot water recirculation line?
- Yes. The CSM-KNOB is a lead-free model, which is what makes it legal for potable water — balancing a DHW recirculation loop means the valve sits in the drinking-water path. Use it to set the return flow on each riser so the far fixtures get hot water without over-pumping the near ones. The standard (non-LF) models in this series are for closed hydronic loops only.
Specifications
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Type: Balancing
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Body Material: Lead-Free Bronze
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Seat / Seal Material: FKM (Viton)
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Application: Hydronic Heating/Cooling, DHW Recirculation
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Pack Quantity: 50
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: CSM-KNOB
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Certifications: NSF-61
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Lead-Free: Yes
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Balancing Type: Manual Circuit Balancing
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Valve Functions: Balancing;Flow Measurement;Shutoff
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Flow Readout: Dual PT ports, 1/4" SAE 45° flare, checked w/ drip caps
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Memory Stop: Yes
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Positive Shutoff: Yes
