Backflow Preventers(Low Pressure)

Basic information of Backflow Preventers(Low Pressure)

This valve can strictly prevent the occurrence of backflow pollution, is a safe device to ensure the hygiene of drinking water.

Features of Backflow Preventers(Low Pressure)

1. More superior streamline design, energy - saving effect；
2. Discharge control device and outlet are designed without obstacles to reduce fluid resistance；
3. More sensitive check effect, low opening pressure；
4. The top is provided with a lifting ring for easy installation.

Principle of Backflow Preventers(Low Pressure)

When the inlet pressure is lower than the outlet pressure, the valve closes and the drain valve opens automatically, and it is always in the open state. The middle chamber is the same as the atmosphere, realizing air partition, and the partition performance is safe and reliable. When the water supply stops, the sealing force of the first and second check valve disc will increase automatically, effectively improving the sealing reliability.

Installation and Commissioning of Backflow Preventers(Low Pressure)

Butterfly or gate valves should be installed on both sides of the low pressure backflow preventer. Filters should be installed at the inlet and expansion or soft joint should be installed at the outlet. The discharge outlet of the drainer shall be additionally installed with the outlet pipe, which shall be downward directed to a place greater than or equal to 100mm above the intake port of the collector well. No valves shall be allowed in the middle. For specific use, please consult ZECO Valve Group.

Product scope, Standards & Materials of Backflow Preventers(Low Pressure)

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

Check Valve

The check valve for water of ZECO is the advanced pipe control equipment at home and abroad, mainly installed at the entrance of hydropower station turbine, used as the inlet valve of turbine, or installed at the outlet of pump station of water conservancy, electric power, water supply and drainage, which replaces the resilient seated gate valve. The check valve of ZECO has a small flow resistance coefficient, high automation degree, complete function, stable and reliable performance.

ZECO Valve Group, founded in 1991 with focus on manufacturing Water valves, including control valves, balancing valves,gate valves, butterfly valves, check valves, and air valves. Valve sizing 1/2” to 88”, rating BS 10bar through BS 25bar, served covering buildings & construction, waterworks, fire protection and many other fields. ZECO has excellent product quality and sound managing system. We have certificates of ISO9001, ISO14001, ISO18001, WRAS, FM, API 6D, CE, TS, and Sanitary Certificate for Drinking Water Equipment. Meanwhile, our products are insured by PICC. Besides, we are member of China Valve Industry Association, China Fire-proof Association and Water Supply and Sewage Engineering Division of China Construction Metal Structure Association, and having long-term cooperation with China National Chemical Equipment Corporation (CNCE) and China Petroleum & Chemical Engineering Survey and Design Association(CPCESDA). After development of 26 years, today the company supplies products to more than 30 countries and regions in the world and becomes one of the leading supplies china flow control valve.