Float type drain trap

Abstract

The present invention provided a float type drain trap capable of preventing penetration of foreign matters into the pilot valve to eliminate troubles caused with penetration of foreign matters, furnishing the pilot valve operation with stability and function of snap action, and reducing the bore diameter of the pilot valve to make the float as small as possible. The pilot valve mechanism is constructed by comprising a pilot valve 7, disposed in part of the pilot chamber 8 and putting the pilot chamber 8 in communication with the outside of the drain case 1, an orifice 9, formed on the upstream side of the pilot valve 7 and putting the pilot chamber 8 in communication with the inside of the drain case 1, and a microfilter 10 provided on the orifice 9, and a permanent magnet 11 is provided on said pilot valve 7, while on said float 6 is provided a permanent magnet 12 for operating the pilot valve 7 in repellence to the permanent magnet 11.

Dependencies are inferred from the claim text.