1 1/2" Watts LF600 Soft Seated Check
Item Number: 0555179
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$467.62
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Brand - Watts
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- Valve Size: 1 1/2 inch
- Weight: 18.5 lb
- Body Material: Lead Free* cast copper silicon alloy
- Seat Material: PTFE
- Silent operation prevents water hammer
- Maximum Working Pressure (WOG Non-Shock): 400 psi
- Lead Free* construction (less than 0.25% lead)
- Installs horizontally or vertically with upward flow
- Low pressure drop design
Description
Description
The Watts Series LF600 1 1/2 inch Lead Free* Silent Check Valve is a brass check valve designed for general plumbing and industrial applications. It prevents water hammer by operating silently with a low pressure drop. Constructed from lead-free cast copper silicon alloy with a PTFE seat, this valve is suitable for both horizontal and vertical installations with upward flow. It offers a maximum working pressure of 400 psi WOG non-shock and complies with lead-free installation requirements. Item number 0555179.
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Connections
- The valve features threaded end connections for easy installation into existing piping systems.
- It is designed for installation in either a horizontal or vertical position, ensuring versatility in various plumbing and industrial setups. For vertical installations, ensure upward flow.

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Additional Details
This 1 1/2 inch Watts Series LF600 Lead Free* Silent Check Valve is designed for general industrial and plumbing applications to prevent the damaging effects of water hammer in piping systems.
It provides quiet operation with a low pressure drop and can be installed in either horizontal or vertical orientations with upward flow.
Features
- Conical Lead Free* check for full fluid flow
- PTFE seat ensures reliable sealing
- Designed for silent operation, preventing water hammer
- Achieves low pressure drop, equivalent to a swing check valve
- Can be installed in horizontal or vertical position with upward flow
- Lead Free* construction, with wetted surfaces containing less than 0.25% lead by weight
- Equipped with threaded end connections
Construction Materials
- Body: Lead Free* cast copper silicon alloy
- Check: Lead Free* copper silicon alloy
- Seat: PTFE
- Adapter: Lead Free* brass
- Guide Bushing: Stainless Steel
- Spring: Stainless Steel
- O-ring: Nitrile
Notice: These valves are not suggested for installation in sewage ejector piping or for reciprocating air compressor service. Inquire with governing authorities for local installation requirements.
Specifications
- Valve Size: 1 1/2 inch
- Body Material: Lead Free* cast copper silicon alloy
- Check Material: Lead Free* copper silicon alloy
- Seat Material: PTFE
- Adapter Material: Lead Free* brass
- Guide Bushing Material: Stainless Steel
- Spring Material: Stainless Steel
- O-ring Material: Nitrile
- End Connections: Threaded
- Maximum Working Pressure (WOG Non-Shock @ -20°F to 100°F): 400 psi (27.6 bar)
- Maximum Working Pressure (WSP @ 250°F): 15 psi (1 bar)
- Installation: Horizontal or Vertical (upward flow)
- Lead Content: Less than 0.25% by weight (wetted surface)
Dimensions & Weight
- Length: 4 inches (102 mm)
- Weight: 3.0 lbs (1.4 kg)
Certificates & Approvals
- Certified to NSF/ANSI 372
FAQs
What is the primary purpose of the Watts LF600 silent check valve?
The Watts LF600 silent check valve is designed to prevent water hammer in piping systems, which can cause noise and damage. It does this by closing silently and efficiently.
Can this check valve be installed in any orientation?
This valve can be installed in both horizontal and vertical positions. For vertical installations, it is crucial to ensure that the flow direction is upward.
What materials are used in the construction of this valve?
The valve features a body and check made from Lead Free* cast copper silicon alloy, an adapter of Lead Free* brass, a PTFE seat, stainless steel guide bushing and spring, and a Nitrile O-ring.
What are the pressure limitations for the 1 1/2 inch LF600 valve?
The valve has a maximum working pressure of 400 psi (27.6 bar) WOG non-shock at temperatures from -20°F to 100°F, and 15 psi (1 bar) WSP at 250°F.
Is this Watts LF600 check valve suitable for all types of water systems?
The valve is suitable for general industrial and plumbing applications. However, it is explicitly not suggested for installation in sewage ejector piping or for reciprocating air compressor service.