Patent ID: 7632398

Claim:
A filter connectable to a fluff pine under pressure, comprising: means defining a first chamber having a cylindrical wall and a pair of axially spaced ports; means defining a second chamber having a cylindrical wall disposed axially relative to said first chamber and a radially disposed inlet communicable with said fluid line and an axially spaced outlet port; means defining a third chamber having an inlet port communicating with the outlet port of said second chamber, an outlet port communicable with said fluid line and a filter medium disposed therein between said inlet and outlet ports thereof, a piston having a head portion disposed in said first chamber, cooperating with said first mentioned means to provide a first variable chamber communicating with one of said ports of said first mentioned chamber and a second variable chamber communicating with the other of said ports of said first mentioned means, and a rod portion received in said second chamber, provided with a length sufficient to unobstruct said inlet port of said second chamber when said piston is in a retracted position, allowing fluid from said fluid line to flow into said second chamber, and to obstruct said inlet port of said second chamber when said piston is in an extended position; a valve having an inlet port communicable with said fluid line and a pair of outlet ports, operative to alternatively intercommunicate said inlet port thereof with one of said ports of said variable chambers and the other of said ports of said variable chambers with said outlet port thereof, and said inlet port thereof with the other of said ports of said variable chambers and the one of said ports of said variable chambers with said outlet thereof, to reciprocate said piston; and means responsive to the reciprocation of said piston for effecting the operation of said valve to alternatively intercommunicate said fluid line with one of said variable chambers, whereby upon reciprocation of said piston, fluid will be drawn from said fluid line into said second chamber and expelled from said second chamber and through said third chamber to be filtered.