1 1/2 LF800M4-QT-FZ

Item Number: T792014
1 1
$1,551.75
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • 1 1/2 inch Lead Free Anti-Siphon Pressure Vacuum Breaker
  • Prevents backsiphonage of contaminated water
  • Lead Free* cast copper silicon alloy body construction
  • Includes freeze sensor for SentryPlus Alert® technology
  • Female NPT inlet and outlet connections with quarter turn shutoffs
  • Maximum Working Pressure: 150 psi
  • Temperature Range: 33°F to 140°F
  • Easy maintenance with replaceable plastic seat and internal access

Description

This 1 1/2 inch Watts LF800M4QT Lead Free Anti-Siphon Pressure Vacuum Breaker prevents backsiphonage of contaminated water into a potable water supply. Constructed from durable lead free cast copper silicon alloy, it features a replaceable plastic seat and easy-access internal parts for simple maintenance. Ideal for irrigation and industrial process water systems, it operates up to 150 psi. An integrated freeze sensor works with SentryPlus Alert® technology to warn of freezing conditions, enhancing system protection. Female NPT inlet and outlet connections with quarter turn shutoffs ensure straightforward installation. Item number T792014.

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Connections

  • This device features 1 1/2 inch Female NPT inlet and outlet connections, making it compatible with 1 1/2 inch Male NPT piping.

Installation

  • Designed for vertical installation in a continuous pressure potable water supply system, it must be installed 12 inches above the highest point of the downstream piping. The supply must connect to the bottom of the valve.
  • Adequate space is required around the valve for periodic inspection, servicing, and testing.

Freeze Sensor Activation

  • The integrated freeze sensor requires an add-on connection kit (sold separately) for activation and communication of alerts via Wi-Fi, Building Management Systems (BMS), or Irrigation Management Systems (IMS). Without this kit, the sensor is a passive component and does not communicate.

Important Note: Vacuum breakers are not designed, tested, or approved to protect against backpressure backflow or water hammer shock. For these conditions, a Watts LF009 Reduced Pressure Zone Backflow Preventer or a Watts Series LF15 Water Hammer Arrestor should be considered, respectively.

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Additional Details

This 1 1/2 inch Watts LF800M4QT Lead Free Anti-Siphon Pressure Vacuum Breaker prevents backsiphonage of contaminated water into a potable water supply. It is ideal for continuous pressure applications such as irrigation systems and industrial process water systems where water enters equipment at or below its flood rim.

Key Features

  • Backsiphonage Prevention: Designed to prevent reverse flow of polluted water from entering into the potable water supply.
  • Lead Free Construction: Features a lead free cast copper silicon alloy body construction, ensuring compliance with lead free installation requirements.
  • Internal Components: Includes a silicone rubber check valve disc, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O-ring seal, and a lightweight plastic disc float.
  • Freeze Sensor: Equipped with an integrated freeze sensor for use with SentryPlus Alert® technology to signal facility personnel when temperatures approach and reach the freezing point.
  • Ease of Maintenance: Features a replaceable plastic seat and easy internal access for simplified servicing. Test cocks are positioned for easy testing and winterization draining.
  • Shutoff Valves: Standardly equipped with tee handle quarter turn ball valve shutoffs on both the inlet and outlet.

A WARNING: The freeze sensor solely provides alerts about a possible freeze event and cannot prevent a freeze event from occurring. User action is required to prevent freeze conditions from causing product and/or property damage. An add-on connection kit (sold separately) is required to activate the freeze sensor's communication features for Wi-Fi, BMS, or IMS integration. Vacuum breakers are not designed, tested, or approved to protect against backpressure backflow or water hammer shock.

Specifications

  • Size: 1 1/2 inch
  • Model: LF800M4QT
  • Type: Anti-Siphon Pressure Vacuum Breaker
  • Connection Type: Female NPT inlet and outlet
  • Temperature Range: 33°F to 140°F (0.5°C to 60°C)
  • Maximum Working Pressure: 150 psi (10.3 bar)
  • Minimum Operating Pressure: 15 psi (55 kPa)
  • Lead Free: Yes (less than 0.25% lead by weight)

Materials

  • Body Material: Lead Free* cast copper silicon alloy
  • Springs: Stainless steel
  • Bonnet: Celcon®
  • Vent Disc: Silicone rubber
  • Disc Holder Float: Polypropylene
  • Check Valve Disc: Silicone rubber
  • Check Valve Seat: Noryl® plastic
  • Bonnet O-ring: Silicone rubber
  • Seat O-ring: Silicone rubber

Dimensions (1 1/2 inch)

  • Dimension A: 9 1/4 inches (235 mm)
  • Dimension B: 9 1/2 inches (241 mm)
  • Dimension C: 3 1/4 inches (83 mm)
  • Dimension D: 6 1/4 inches (159 mm)
  • Dimension E: 6 3/8 inches (162 mm)
  • Dimension G: 5 inches (127 mm)
  • Weight: 14 lb (6.3 kg)

Certificates & Approvals

  • ANSI/ASSE Standard 1020
  • ASSE® 1020
  • UPC®
  • NSF® Certified to NSF/ANSI 372
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California, Manual Section 10.
  • CSA 1/2" to 2"

FAQs

What is the primary function of the Watts LF800M4QT?

The Watts LF800M4QT is an anti-siphon pressure vacuum breaker designed to prevent the reverse flow of polluted water back into a potable water supply system due to backsiphonage.

What type of connections does this vacuum breaker have?

This model features 1 1/2 inch Female NPT inlet and outlet connections, making it compatible with piping that has 1 1/2 inch Male NPT threads.

Is the freeze sensor on this device active out of the box?

No, the freeze sensor is a passive component initially. An add-on connection kit, sold separately, is required to activate its communication features for Wi-Fi, BMS, or IMS alerts.

What are the typical applications for the LF800M4QT?

It is ideally suited for health hazard continuous pressure applications such as irrigation systems and industrial process water systems where the water enters the equipment at or below its flood rim.

Can this device protect against backpressure backflow or water hammer?

No, this anti-siphon pressure vacuum breaker is not designed, tested, or approved to protect against backpressure backflow or water hammer shock. Different devices are recommended for those specific protections.