3/4" Watts LF601S Soft Seated Check - Sweat

Item Number: 0555182
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$219.38
Limited Stock (2)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Size: 3/4 inch
  • Weight: 28.4 lb
  • Connection Type: Solder (Sweat)
  • Body Material: Lead Free Cast Copper Silicon Alloy
  • Disc Material: Viton® (Soft Seated)
  • Maximum Operating Pressure: 250 psi WOG non-shock (valve)
  • Silent Operation: Prevents water hammer and absorbs pressure fluctuations
  • Installation: Horizontal or Vertical with upward flow
  • Design: Non-testable, Lead Free Compliant

Description

The Watts 3/4" LF601S is a Lead Free* soft-seated silent check valve designed for plumbing and industrial applications to prevent water hammer and absorb fluctuating pressure. Featuring a lead-free cast copper silicon alloy body and a Viton® disc, it offers durable, silent operation with a low pressure drop. This non-testable model uses solder (sweat) end connections and can be installed horizontally or vertically with upward flow. It boasts a maximum operating pressure of 250 psi (200 psi for 50-50 solder connections) at 100°F. The valve's wetted surfaces contain less than 0.2% lead by weight, complying with lead-free installation requirements.

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Connections

  • The Watts LF601S check valve features solder end connections, also known as sweat connections, for installation into copper piping systems.
  • It is designed for soldering without disassembly using a low-temperature solder (420°F / 216°C).
  • The valve must be installed with upward flow and can be positioned either horizontally or vertically.

When soldering, apply heat with the flame directed AWAY from the center of the valve body to prevent seat damage. Note that the maximum operating pressure for 50-50 solder connections is 200 psi at 100°F.

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Additional Details

The 3/4 inch Watts Series LF601S Lead Free* Soft Seated Silent Check Valve is designed for general industrial and plumbing applications to prevent water hammer and absorb fluctuating pressure, ensuring silent operation with a low pressure drop.

This valve features a lead-free cast copper silicon alloy body and can be installed in both horizontal or vertical positions with upward flow. It is a non-testable design.

Features

  • Lead Free* cast copper silicon alloy body for durability
  • Integral Lead Free* copper silicon alloy seat
  • Viton® disc for reliable sealing, providing a soft-seated design
  • Designed for silent operation to prevent water hammer
  • Helps absorb fluctuating pressure
  • Installs in horizontal or vertical position with upward flow
  • Low pressure drop equivalent to a swing check
  • Complies with Lead Free* installation requirements
  • Non-testable design

This valve is not suggested for installation in sewage ejector piping or for reciprocating air compressor service. A trained product installer must thoroughly read all installation instructions and product safety information before beginning installation. When soldering, apply heat with the flame directed AWAY from the center of the valve body to prevent seat damage.

Specifications

  • Body Material: Lead Free* Cast Copper Silicon Alloy
  • Seat Material: Integral Lead Free* Copper Silicon Alloy
  • Disc Material: Viton®
  • Spring Guide Material: Stainless Steel
  • Spring Material: Stainless Steel
  • Adapter Material: Lead Free* Brass
  • Valve Size: 3/4 inch
  • Connections: Solder End
  • Maximum Operating Pressure (Valve): 250 psi WOG non-shock @ 100°F (38°C)
  • Maximum Operating Pressure (with 50-50 Solder Connections): 200 psi (13.8 bar) @ 100°F (38°C)
  • Minimum Operating Temperature: -20°F (-29°C)
  • Maximum Operating Temperature: 250°F (121°C)
  • Weight: 0.63 lbs
  • Overall Length (A): 3 3/8 inches
  • Overall Height (B): 1 1/2 inches

Certificates & Approvals

  • Lead Free* Compliant: Wetted surface contains less than 0.2% lead by weight

FAQs

What is the primary purpose of the Watts LF601S silent check valve?

The Watts LF601S silent check valve is used in plumbing and industrial applications to prevent water hammer and ensure silent operation within the piping system, with minimal pressure drop. It also helps to absorb fluctuating pressure.

What type of connections does the 3/4" Watts LF601S valve have?

This valve features 3/4 inch solder end connections, also commonly referred to as sweat connections, for secure installation into piping systems.

What is the maximum operating pressure for this check valve?

The valve itself is rated for a maximum operating pressure of 250 psi WOG non-shock at 100°F (38°C). However, with 50-50 solder connections, the maximum operating pressure is 200 psi at 100°F (38°C) as per ANSI B16.18.

Can the Watts LF601S valve be installed in any position?

Yes, this silent check valve can be installed in both horizontal and vertical orientations, but it must always ensure upward flow of the media.

Is this valve suitable for use with potable water?

Yes, the Watts LF601S is Lead Free* compliant, meaning the wetted surfaces contain less than 0.2% lead by weight, making it suitable for applications where reduced lead content is required for consumable water.