Patent ID: 9671309
Date: 2017-06-06
CPC Classifications: B01D,F01M,F02M,F16K,G01M,Y10T

Claim:
1. A drainage apparatus for a filter device, comprising: a housing including a drainage duct extending from an inlet fluidly connected upstream of the housing and an outlet fluidly connected downstream of the housing; a solenoid valve arranged in the housing at the inlet; a non-return valve arranged downstream of the solenoid valve in the housing outlet, the non-return valve in fluid communication with the solenoid valve via a chamber of the drainage duct, wherein the non-return valve is configured to discharge fluid from the chamber, a pressure sensor in fluid communication with the chamber arranged between the solenoid valve and the non-return valve, the pressure sensor configured for pressure sensing in a chamber; and a control apparatus operably connected to the solenoid valve, wherein the control apparatus is configured to open and close the solenoid valve to convey fluid from the inlet to the chamber, but does not control the non-return valve for discharging fluid from the chamber downstream of the outlet.