Find all types of backflow preventer devices in one place!

Certain types of backflow preventer devices must undergo field testing to ensure proper operation. They are said to be “verifiable”. The law obliges to certify these devices after installation and annually thereafter, after a relocation or after a repair. For Canada, the requirements for testing are described in B64.10.1-11 – Maintenance and Field Testing of Backflow Preventers.

Other types of so-called “unverifiable” devices 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.

Reduced pressure principle backflow preventer (RP)

  • CSA: B64.4
  • ASSE: 1013
  • Highest hazard protection: high or severe
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from both back siphonage and back pressure.
  • Are generally used in locations where an air gap is impractical.
  • Leaks are easily detected in case of failure.
  • Should not be installed below ground level, in a pit or a vault.
  • Requires access to a floor drain.

Application examples

  • Cement plant
  • Dental surgery clinic
  • Hospital
  • Printing house
  • Henhouse
  • Chemical factory

Models

 WILKINS

  • 375 & 375A
  • 375AST
  • 475
  • 975XL & 975 XL2U

CONBRACO

  • RP 40S
  • RP 4A
  • RPLF 4A & RPLF 4An

WATTS

  • 009 & LF009
  • LF909
  • 919 & LF919
  • 957
  • 994
  • SS009

Reduced pressure principle backflow preventer for fire protection systems (RPF)

  • CSA: B64.4.1
  • ASSE: 1047
  • Highest hazard protection: high or severe
  • Back pressure resistant: yes
  • Continuous pressure resistant:  yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from both back siphonage and back pressure for high risk fire protection systems.
  • Are generally used in locations where an air gap is impractical.
  • Leaks are easily detected in case of failure.
  • Should not be installed below ground level, in a pit or a vault.
  • Requires access to a floor drain.
  • For models of 2 1/2 ″ and more, assembly with OSY (Open Stem & Yoke) or butterfly valves ready to receive added supervision.

Application examples

Buildings or sites where there are chemicals in the sprinkler lines:

  • Terminal
  • Chemical factory
  • Petroleum product storage
  • Sprinkler line where there is a risk of freezing with glycol gel

Models

 WILKINS

  • 375 & 375A
  • 375AST &375ASTDA
  • 475
  • 975XL & 975 XL2U
  • 375ADA
  • 475DA

CONBRACO

  • RP 40S
  • RP 4A
  • RPLF 4A & RPLF 4An

WATTS

  • 009 & LF009
  • LF909
  • 919 & LF919
  • 957 & 957 RPDA
  • 994 & 994 RPDA
  • 909RPDA

Double check valve backflow preventer (DCVA)

  • CSA: B64.5
  • ASSE: 1015
  • Highest hazard protection: moderate
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from both back siphonage and back pressure if  minor or moderate hazards exist.
  • Can be installed horizontally and vertically if approved by a recognized agency (US, CSA, etc.).
  • Can be placed in a vault if the test cocks are sealed.

Application examples

  • Arena
  • Dental clinic
  • Shopping mall
  • Office Building
  • Car dealer
  • Motel and hotel

Models

 WILKINS

  • 350 & 350XL
  • 350AST
  • 350A
  • 450
  • 950XLT & 950XLT2

CONBRACO

  • DC4A
  • DCLF4A & DCLF4AN
  • DC4SG & DC4SGN

WATTS

  • 007 & LF007
  • 709 & LF709
  • 719 & LF719
  • 757
  • 774
  • SS007

Double check valve backflow preventer for fire protection systems (DCVAF)

  • CSA: B64.5.1
  • ASSE: 1048
  • Highest hazard protection:  moderate
  • Back pressure resistant: yes
  • Continuous pressure resistant: yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from both siphonage and back pressure for low or moderate risk fire protection systems.
  • Can be installed horizontally and vertically if approved by a recognized agency (US, CSA, etc.).
  • Can be placed in a vault if the test cocks are sealed.
  • For models of 2 1/2 ″ and more, assembly with OSY (Open Stem & Yoke) or butterfly valves ready to receive added supervision.

Application examples

The majority of fire sprinkler systems or fire hoses water supply networks:

  • Office tower
  • Arena
  • Shopping mall
  • College, school, university
  • Car dealer
  • Motel

Modèles

 WILKINS

  • 350AST & 350ASTDA
  • 350A & 350ADA
  • 350

CONBRACO

  • DCDALF4A & DCDALF4An
  • DCDA2LF4A & DCDA2LF4AN
  • DCDA4S

WATTS

  • 007 & 007DCDA
  • 709 & 709DCDA
  • 757 & 757DCDA
  • 774 & 774DCDA

Pressure vacuum breaker (PVB)

  • CSA: B64.1.2
  • ASSE: 1020
  • Highest hazard protection: high or severe
  • Back pressure resistant: no
  • Tolère la pression continue: yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from back siphonage only for low, moderate or high risk systems.
  • Careful consideration shall be given to the possibility of improper use of PVB devices, e.g., when a downstream connection is made that would permit back pressure to occur.
  • The critical level must be located at least 300 mm above the overflow level of the fixture, container or accessory.
  • Requires no drain.
  • Should not be installed below ground level, in a pit or a vault.

Application examples

  • Siphon initiator
  • Spittoon
  • Autopsy and mortuary equipment

Models

 WILKINS

  • 420XL
  • 720A

CONBRACO

  • PVB4A
  • PVBLF4A

WATTS

  • 800M4FR & LF800M4FR
  • 800M4QT & LF800M4QT

Spill-resistant pressure vacuum breaker (SRPVB)

  • CSA: B64.1.3
  • ASSE: 1056
  • Highest hazard protection: high or servere
  • Back pressure resistant: no
  • Continuous pressure resistant: yes
  • Field testing required: yes

Overview/Benefits

  • Provide reliable protection from back siphonage only for low, moderate or high risk systems.
  • Careful consideration shall be given to the possibility of improper use of SRPVB devices, e.g., when a downstream connection is made that would permit back pressure to occur.
  • The critical level must be located at least 300 mm above the overflow level of the fixture, container or accessory.
  • Spill-resistant membrane
  • Should not be installed below ground level, in a pit or a vault.

Application examples

  • Siphon initiator
  • Spittoon
  • Autopsy and mortuary equipment

Models

 WILKINS

  • 460XL

CONBRACO

  • SVB4W

WATTS

  • 008PCQT & LF008PCQT

Contact us to purchase a backflow preventer device. We will help you select it according to the application to be protected.

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Discover backflow preventers not requiring periodic field testing.

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