The valve is completely made of polypropylene. It is used in inellesfries as well as for irrigation purpose. Where the delivery pressure is high (i.e. more than 20 meters) it is recommended to install a N.R.V in the discharge Line. The N.R.V should be placed near the pump to protect the pump from excessive back pressure to prevent the water running back through the pump in case sudden failure of prime movers.
Reflux valve can be used horizontally as well as vertically.