The Watts LFN45BU-LP-M1 3/4 is a 3/4" lead-free pressure reducing valve with single union NPT connections. It reduces inlet pressure of up to 400 psi to an adjustable 10-35 psi downstream, factory set at 30 psi. It features a copper body and a epdm seat. Rated to 400 psi. This model is certified lead-free for potable-water installations.
This 3/4 inch lead free water pressure reducing valve is designed for low pressure applications to reduce incoming water pressure to protect plumbing systems and reduce water consumption for commercial, industrial and residential applications. It features a lead fee cast copper silicon alloy body, thermoplastic seat cartridge, NPT threaded union inlet and NPT female outlet connections, reinforced diaphragm, and a bypass valve to control thermal expansion pressure. The reduced low pressure rating is set at 30 psi (207 kPa). Suitable for up to 400 psi (27.6 bar). The temperature range is 33 to 180 degrees F (0.5 to 82 degrees C).
Features
- Lead free body construction
- NPT threaded union inlet and NPT female outlet
- Pressure setting at 30 psi (207 kPa)
- Thermoplastic seat and cage
- Includes: Bypass
Common Questions
- Does it have a built-in bypass for thermal expansion, or do I still need an expansion tank?
- LFN45BU-LP-M1 3/4 includes an integral thermal-expansion bypass. When downstream pressure from a water heater rises above the inlet pressure, the bypass relieves that excess back through the valve toward the supply, which prevents nuisance pressure build-up on a closed system. It is not a substitute for a properly sized thermal expansion tank where your local code requires one - the bypass only relieves back to the street when street pressure is lower, so check the code in your jurisdiction.
- What pressure is it set to out of the box?
- LFN45BU-LP-M1 3/4 ships factory set at 30 psi. The adjustable reduced-pressure range is 10 to 35 psi, so you can dial the outlet anywhere in that band on site with the adjusting screw - loosen the locknut, turn in to raise pressure and out to lower it, then retighten and verify with a gauge.
- Does it include a strainer?
- No - LFN45BU-LP-M1 3/4 does not have an integral strainer. On dirty or older supply lines, install a separate inline strainer upstream to keep debris off the seat.
- Does it come with a gauge?
- No - LFN45BU-LP-M1 3/4 has no gauge and no gauge tapping. Set the outlet pressure using a gauge elsewhere on the downstream piping. The -GG version of this model ships with a gauge tapping and a 160 psi gauge.
Specifications
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Type: Pressure Regulator
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Size: 3/4"
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Inlet Size: 3/4"
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Outlet Size: 3/4"
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Connection: NPT
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Body Material: Copper
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Seat / Seal Material: EPDM
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Max Pressure (psi): 400
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Shutoff: None
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Pack Quantity: 12
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LFN45BU-LP-M1 3/4
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Certifications: ASSE-1003, ANSI-A112.26.2, IAPMO
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Lead-Free: Yes
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Factory Set Pressure (psi): 30
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Adjustable Range - Min (psi): 10
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Adjustable Range - Max (psi): 35
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Thermal Expansion Bypass: Yes
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Integral Strainer: No
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Gauge: None
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Union Configuration: Single Union
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Capacity Class: Standard
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Regulated Media: Water
