Festures of Backflow Preventers

• The double check valve is designed as a whole, with small structure；
• Body is streamlined with little resistance loss；
• Combination of a double check valve and safety drain valve can completely prevent backflow pollution under any working condition；
• All moving parts are made of non-rust and wear-resistant materials with long service life.

Backflow Preventers Working Principle

Backflow preventers for two check valve series, when one of the seal damage, the other also ACTS as a seal to prevent backflow. However, when the sealing of two check valves is broken at the same time, the check function is lost. Backflow preventers on the common type of foundation in the middle of the drain, so even if two check valve sealing at the same time damage, it can also play a role in preventing backflow pollution.

Backflow Preventers Installation and Commissioning

This valve must be installed horizontally, the environment of the installation site should be clean, there should be sufficient maintenance space, the main degree of safety drain or (air barrier) outlet is more than 300mm above the ground, and it should not be flooded by water or debris, and the installation area should be equipped with drainage facilities. For specific use, please consult ZECO Valve Group.

Backflow Preventers Material and Standard

Size Range: 2″~12″
Pressure Rating: 10bar ~ 25bar
Face to Face Dimensions: AMSE B16.10, EN558-1
Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2
Coating: Fusion Bonded Epoxy Coating
Inspection and Test: ISO 5208 / EN 12226-2