The Watts LFCSM-61-M2-S 2 is a 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 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-M2-S 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 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-M2-S 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-M2-S 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: 2"
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Inlet Size: 2"
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Outlet Size: 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: 6
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LFCSM-61-M2-S 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
