Find in one place all types of backflow preventers!

Fields testing is mandatory for some types of backflow preventers in order to ensure proper operation. Those types of devices required field testing after installation and annually thereafter, after moving or after repair. For Canada, CSA B64.10.1-11 – Maintenance and field testing of backflow preventers applies.

Other types of devices dont’ required field testing. They are installed on specific applications and are designed to protect a particular type of risk.

Here is a list of the most frequently requested backflow preventers.

Dual check valve backflow preventer (DCAPC)

  • CSA: B64.6
  • ASSE: 1024
  • Highest hazard protection: minor
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: no

Overview/Benefits

  • Provide reliable protection from both back siphonage and back pressure if  minor hazards exist.
  • Can be placed in a vault.

Application examples

  • Domestic water supply
  • Coffee machine

Models

 WILKINS

  • 700 & 700XL
  • 705

CONBRACO

  • DUC40 & DUCLF40
  • DUC4FP
  • DUC4N & DUCLF4N

WATTS

  • 7 & LF7
  • LF7R
  • 07S & LF07S
  • 7C & LF7C
  • 7B

Dual check valve backflow preventer with atmospheric port (DCAP)

  • CSA: B64.3
  • ASSE: 1012
  • Highest hazard protection: minor
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: no

Overview/Benefits

  • Provide reliable protection from both back siphonage and back pressure if  hazards risk exist.
  • Do not use in place of Reduced pressure principle backflow preventer (RP).
  • Leaks are easily detected in case of failure.
  • Should not be installed below ground level, in a pit or a vault.

Application examples

  • Low pressure boiler for single-family residence (without use of chemicals)

Models

 WILKINS

  • 760

CONBRACO

  • DCAP  & DCAPLF

WATTS

  • 9D

Dual check valve backflow preventer with atmospheric port for carbonators (DCAPC)

  • CSA: B64.3.1
  • ASSE: 1022
  • Highest hazard protection: moderate
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: no

Overview/Benefits

  • Under backflow conditions, the diaphragm seat on the primary check valve lifts and vents flow through
    the atmospheric port, thus protecting the potable water supply.
  • Leaks are easily detected in case of failure.

Application examples

  • Provide backflow protection when installed on the
    water supply connection of carbonated beverage dispensing equipment.

Models

 WILKINS

  • 740 (ASSE seulement)

CONBRACO

  • CBBP

WATTS

  • SD-2 (ASSE 1032)
  • SD-3 (avec tamis)
  • 9BD (New York)

Atmospheric vacuum breaker (AVB)

  • CSA: B64.1.1
  • ASSE: 1001
  • Highest hazard protection: moderate
  • Back pressure resistant: no
  • Continuous pressure resistant: no (12 hours maximum)
  • Field testing required: no

Overview/Benefits

  • Provide reliable protection from back siphonage only if minor or moderate hazards exist.
  • AVB devices do not provide adequate backflow protection when
    • back pressure can be developed on the downstream side of the device;
    •  the device is located in an area subject to flooding;
    • the device is under line flow pressure continuously for more than 12 h.
  • AVB devices shall be installed with their critical level at least 150 mm above the flood level rim of the fixture, container, or appurtenance.

Application examples

  • Washing tank
  • Outdoor faucet hose
  • Potato-peeling machines

Models

 WILKINS

  • 35XL
  • 35XLVCH

CONBRACO

  • AVB1
  • AVB1LF
  • AVB2

WATTS

  • 188A
  • 288A & LF288A
  • LF288A-DM
  • N388 & LFN388

Hose connection vacuum breaker (HCVB)

  • CSA: B64.2
  • ASSE: 1011
  • Highest hazard protection: minor
  • Back pressure resistant: yes
  • Continuous pressure resistant: no (12 hours maximum)
  • Field testing required: no

Overview/Benefits

  • HCVB  devices are subgroups of AVB devices;
  • Intended for minor hazard installations such as on a hose bibb to which a garden hose can be attached;
  • Intended to be installed on the discharge side of a shut-off valve;
  • Are designed so that when the shut-off valve is turned off, the check valve closes, opening the atmospheric vent and allowing air into the downstream;
  • Incorporate a check valve that is force-loaded to the closed position;
  • Incorporate a vent to atmosphere on the outlet side of the check valve that is force-loaded or biased to the open position;
  • Intended to withstand the small amount of back pressure that can occur if the end of the hose is higher than the hose bibb when it is shut off.

Application examples

  • Hose bibb to which a garden hose can be attached

Models

 WILKINS

  • 420XL
  • 720A

CONBRACO

  • PVB4A
  • PVBLF4A

WATTS

  • 800M4FR & LF800M4FR
  • 800M4QT & LF800M4QT

Laboratory faucet vacuum breaker (LFVB)

  • CSA: B64.7
  • ASSE: 1035
  • Highest hazard protection: minor
  • Back pressure resistant: no
  • Continuous pressure resistant: no (12 hours maximum)
  • Field testing required: no

Overview/Benefits

  • Intended for use on laboratory faucets;
  • Intended for use on the discharge side of the last control valve;
  • Used for minor hazards.
  • Shall not be used under continuous pressure conditions

Application examples

  • Laboratory faucet

Models

 WILKINS

  • 730

CONBRACO

  • LFDUC

WATTS

  • NLF-9 & LFNLF9

Contact us to purchase the right backflow prevention device according to the application to protect.

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Discover backflow preventers requiring periodic field testing.

Source: CSA Standard B64.10 – 11, section 4.3 – Mechanical backflow preventers.