The Watts LFCSM-61-M1-S 1/2 is a 1/2" lead-free manual circuit balancing valve with Sweat connections. It features a lead-free bronze body and a fkm (viton) seat. This model is certified lead-free for potable-water installations.
This 1/2 inch lead free flow measurement valve monitors system flow in low to medium flow rate HVAC units, providing a highly accurate flow measurement. It consists of lead free body construction with bi-directional positive shutoff ball valve design, blow-out proof stem, a position indicator, memory device, checked metering ports with drip caps, two pressure taps, integral drain ports, solder connections, and a drain plug. It has a compact size which allows for easy installation and access in a crowded piping environment and is ideal in hot/chilled water units such as fan coil units, water source heat pumps, unit heaters, unit ventilators, finned radiation, and small domestic hot water lines.
Features
- Lead free body
- Bi-directional flow
- Solder ends
- Positive shutoff
Common Questions
- Do I need a separate meter to read the flow?
- Yes. The LFCSM-61-M1-S 1/2 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 1/2" 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 LFCSM-61-M1-S 1/2 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 LFCSM-61-M1-S 1/2 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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Size: 1/2"
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Inlet Size: 1/2"
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Outlet Size: 1/2"
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Connection: Sweat
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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: 24
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LFCSM-61-M1-S 1/2
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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
