F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/36
F04B 43/02 (2006.01) F04B 9/105 (2006.01)
Patent
CA 1224671
A PUMP FOR SUPPLYING A LIQUID ADDITIVE TO A FLOW OF LIQUID ABSTRACT OF DISCLOSURE This pump comprises a dosing chamber 11 communicating with inlet and outlet openings 12, 13 for a liquid additive. A displaceable member 20, which dispenses the liquid additive, is connected by connection means 30 to displaceable member 40 in an operating chamber 50 with first and second chambers 51, 52 and ports 53, 54. Operating switching means 60 controls the supply of operating fluid to said ports 53, 54 in such manner that when one chamber (51, 52) is supplied with operating fluid the other chamber (52, 51) is evacuated: successive switching thereof effects reciprocation of the connection means 30 and dispenses measured quantities of liquid additive. The operating switching means 60 is fluid actuated. A pilot switching means 70 is mechanically associated with said reciprocating connection means 30 and is coupled by fluid couplings 81, 82 to switching means 60 such that, at the end of each stroke of the reciprocating correction means 30, the switching means 60 is actuated to change the supply of operating fluid 55 from one to the other of operating chambers 51, 52.
438330
Johnson Douglas S. Q.c.
Rossell Fluid Control Limited
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