Anti fouling isolation valve

The following is detailed information about anti fouling isolation valves:
1. Definition and Function
Anti fouling isolation valve (also known as backflow preventer) is a safety device that prevents medium backflow through the synergistic effect of two-stage check valves and drainage devices. It is mainly used in drinking water pipeline systems to prevent backflow pollution. Its core function is to prevent the backflow of pollutants caused by pressure fluctuations and ensure water quality safety.
2. Structure and Principle
Core components: consisting of two series connected check valves and a drain, forming a dual barrier mechanism.
Working principle: When the primary check valve leaks, the drain automatically drains to form an air partition, and a high-pressure hose connects the drain to the inlet end of the check valve to achieve pressure difference control.
Safe design: Some models (such as HS41X-16-A) are equipped with drainage devices to further enhance anti backflow capabilities.
3. Technical parameters
Pressure range: 1.0~2.5 MPa (such as 1.0 MPa for HS41X-10 type and 1.6 MPa for HS41X-16Q type).
Applicable temperature: 0~80 ℃ (some models support -10~100 ℃).
Diameter specifications: DN40~DN600, materials include cast iron, ductile iron, stainless steel, etc.
Medium limitation: Only applicable to clean water.
4. Application scenarios
Key installation locations:
Intersection of drinking water and non drinking water pipelines.
Municipal tap water connection pipe section or fire pipeline connection point.
Pressure pump suction pipe or water tank inlet pipe.
5. Installation and maintenance
Installation requirements:
Placed horizontally, with the arrow direction aligned with the flow direction of the medium.
A strength test at 1.5 times the nominal pressure is required.
Maintenance points: Regularly check the sealing performance and drain function.

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