US 7,520,731 B1
Gas pressure driven pump having dual pump mechanisms
Richard H. Langdon, II, Columbia, S.C. (US); Neil J. Davies, Columbia, S.C. (US); and Malcolm P. Gordge, Blythewood, S.C. (US)
Assigned to Spirax Sarco, Inc., Blythewood, S.C. (US)
Filed on Feb. 06, 2006, as Appl. No. 11/348,123.
Int. Cl. F16K 31/18 (2006.01)
U.S. Cl. 417—133  [137/422; 417/127] 18 Claims
OG exemplary drawing
 
1. A gas pressure driven liquid pump, said pump comprising:
a pump body, the pump body having a liquid inlet and a liquid outlet;
a plurality of liquid level indicators, the liquid level indicators being configured to detect a liquid level within the pump body;
a baffle within the pump body, the baffle separating the pump body into a first side and a second side, at least one of the plurality of liquid level indicators configured to detect the liquid level within the first side and at least one of the plurality of liquid level indicators configured to detect the liquid level within the second side;
a void defined by the baffle so as to provide liquid communication there between;
wherein a high liquid level position within one of the first side and the second side triggers fluid communication with a motive gas source such that the liquid within the pump body will flow through the liquid outlet; and
wherein the low liquid level position within one of the first side and the second side triggers fluid communication with an exhaust such that the liquid is allowed to flow into the pump body through the liquid inlet.