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The Design Of Potable Water Supply System For Institutional Setting
[A CASE STUDY OF KWARA STATE POLYTECHNIC PERMANENT SITE] -
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2.5.3 Check Valve:
These are also called reflux valves or non-return valves and are defined as the set of automatic devices which allow water to flow only in one direction and prevent it from flowing in reverse direction (Banerjee, et al.2008). The arrow indicates the direction of flow of water when the water flows as the disc rotates round the hinge and remains in a horizontal plane. The water therefore passes off without any obstruction now if the flow reverses, the disc automatically falls down by rotating round the hinge and remains tightly pressed against the valve seat buy the pressure of water itself, in this way it does not allow the water to flow in reverse direction.
2.5.4 Air Relief Valve:
When the water enters in the pipe lines, it also carries some air with it in which tends to accumulate at high points of pipe. These valves consist of a cast iron chamber bolted on the pipe over the opening in the crown. These valves are automatic in action.
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