These valves are used to check the flow of water in reverse direction.
These are generally provided on the delivery side of the pump. These valves work automatically.
Pressure reducing valve:
In hydraulics, a pressure reducing valve serves the same purpose as a "pressure regulator" valve in a compressed air system.
It is one of a variety of pressure control valves available for hydraulic circuits. It is always used in a branch circuit and never in the full pump flow line.
Air Relief Valve:
it is a type of safety valve used to control or limit the pressure in a system, pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire.
The pressure is relieved by allowing the pressurised fluid to flow from an auxiliary passage out of the system.
Air Valve:
Provided at summits to release air pressure.
Relief Valve or Safety valve or cut-off Valve:
Helps in regulating the water hammer pressure.
Scour valve:
This valve is used to drain the water out of the pipe system.
Sluice valve:
These valves are used to regulate the flow of water in the pipe system by dividing into number of sections.
Foot Valve:
Prevent entry of debris into the pumping system and prevent back flow.
Butterfly valve:
Regulate and Stop the flow specially in large size conduits.
Globe Valve:
Direction of Flow changes by 90° twice
Surge arrestor:
Control of water hammer in pipe lines by absorbing surge energy.
Joint in Water Supply Piping:
Flexible joint:
Where Settlement of pipe line can occur.
Threaded joint:
Recommended for connecting the GI pipes.
Simplex joint:
For joining asbestos cement pipes.
Flanged joint:
Recommended for temporary work where the pipe line is to be dismantled after work or to be shifted.
Expansion joint:
Provided at suitable intervals to take into account the change in pipe length due to temperature variations.
Collar joint:
Recommended for joining R.C.C pipes and asbestos cement pipes.
Spigot and socket joint:
Also known as Bell-spigot joint. Where spigot end is inserted into the bell end.
