Watts LFN45B-M1 - LFN45B-M1 Lead-Free Water Pressure Reducing Valve, 3/4"
Watts LFN45B-M1 - LFN45B-M1 Lead-Free Water Pressure Reducing Valve, 3/4"
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The Watts LFN45B-M1 is a high-capacity, Lead Free* water pressure reducing valve designed for commercial, institutional, and residential potable water applications[cite: 2]. Constructed with a heavy-duty Lead Free copper silicon alloy body, this inline regulator protects downstream plumbing systems from high incoming supply pressures up to 400 PSI, reducing system strain, controlling pressure spikes, and lowering overall water consumption[cite: 2]. It serves as a direct modern replacement valve for legacy water pressure regulators across commercial facilities[cite: 2].
Key Performance & Construction Features:
- Lead Free Copper Silicon Alloy Body: Engineered to comply with strict state and national low-lead plumbing requirements for potable water service[cite: 2].
- Integral Stainless Steel Strainer: Includes an integrated internal stainless strainer screen that catches line scale and debris before it can damage internal valve seating components[cite: 2].
- Thermal Expansion Bypass: Features a built-in bypass mechanism that safely permits thermal expansion pressure on the outlet side to bleed back into the supply main[cite: 2].
- Sealed Spring Cage Design: Built with an encapsulated spring housing engineered for both interior mechanical room setups and accessible outdoor or pit environments[cite: 2].
- In-Line Servicing: The complete internal module—including the seat, cage, and diaphragm—is fully accessible and serviceable directly in-line without un-sweating or removing the valve body from the pipe layout[cite: 2].
Installation Tip: Install near the building main service entrance where supply pressure exceeds 60 PSI[cite: 2]. Always isolate upstream supply and bleed downstream line pressure completely before installation.
| Technical Metric | Operational Threshold Data |
|---|---|
| Valve Series / Model | Watts Series LFN45B-M1[cite: 2] |
| Nominal Line Size | 3/4" (0.75 Inch Connection)[cite: 2] |
| Maximum Inlet Working Pressure | 400 PSI (27.6 bar)[cite: 2] |
| Reduced Pressure Adjustment Range | 25 – 75 PSI (Factory Set at 50 PSI)[cite: 2] |
| Operating Fluid Temperature Range | 33°F to 180°F (0.5°C to 82°C)[cite: 2] |
| Wetted Body Materials | Lead Free Cast Copper Silicon Alloy Body, Thermoplastic Seat/Cage, Reinforced EPDM Diaphragm, Stainless Strainer[cite: 2] |
| Code Approvals & Certifications | ASSE Standard 1003, CSA B356, Certified NSF/ANSI 61 Annex G, Listed IAPMO[cite: 2] |
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