The main purpose of a check valve in a system is to prevent backflow, which could damage equipment or contaminate media upstream. Check valves are generally installed in pipelines to prevent backflow. A check valve is basically a one-way valve, in which the flow can run freely one way, but if the flow turns the valve will close to protect the piping, other valves, pumps etc.There are basically two type of check valve:
- Vertical check valve (Non return valve)
- Horizontal check valve (T type)
Air- Vent valves are used in independent, central, radiant panel heating systems & HVAC systems, etc.OPERATION: - When there is air in the Air-Vent Valve, the force of the float weight acts on the lever which is integral with the plug, thus causing it to move down. Air valves are hydro mechanical devices designed to automatically release air and wastewater gases or admit air during the filling, draining or operation of liquid piping systems for water and wastewater services.