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.

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 if high or severe hazards exist.
  • 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 2 1/2″ et more models, assembly with OSY type valves (Open Stem & Yoke) or butterfly ready to receive an 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 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.
  • For 2 1/2″ et more models, assembly with OSY type valves (Open Stem & Yoke) or butterfly ready to receive an 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 if minor, moderate or high or severe hazards exists.
  • 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.
  • Shall be installed with their critical level at least 300 mm above the flood level of the fixture, container, or appurtenance.
  • Requires no drain.
  • Should not be installed below ground level, in a pit or a vault.

Application examples

  • Detergent dispenser
  • Trap seal primers
  • Spittoon
  • Autopsy and morgue matérials

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 if minor, moderate or high or severe hazards exists.
  • 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.
  • Shall be installed with their critical level at least 300 mm above the flood level of the fixture, container, or appurtenance.
  • Spill-resistant membrane
  • Should not be installed below ground level, in a pit or a vault.

Application examples

  • Trap seal primers
  • Spittoon
  • Autopsy and morgue materials

Models

 WILKINS

  • 460XL

CONBRACO

  • SVB4W

WATTS

  • 008PCQT & LF008PCQT

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

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Discover backflow preventers not requiring periodic field testing.

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