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Contact SupplierLiquid enters from the inlet, passes through the filter element, and gets out of the outlet of the Filter Nozzle. Differential Pressure (DP) Switch is provided across the Inlet and Outlet of the Filter. When the Filter Element gets choked Pressure Drop across the filter increases. Normally maximum Differential Pressure for backwashing is set at 0.5 Kg/cm2. When the Differential Pressure reaches the set limit the DP Switch gives a signal to the Control Panel (CP) and the CP gives a signal to the Motor and Electrically or Pneumatically Actuated Drain Valve. The Motor connected to the back 0 wash arm starts rotating 360 with 10 – 15 RPM; simultaneously the Motorized Drain Valve also gets opened to the atmosphere.