METHOD OF CONVERTING LIQUID RING PUMPS HAVING SEALING LIQUID VENTS

1 . A method of converting a liquid ring pump which utilizes sealing liquid venting into a liquid ring pump which utilizes gas venting comprising the steps of:

removing a conical port member from a pump head of said liquid ring pump;

selecting a passage in said pump and retasking said selected passage into a gas vent passage, wherein said passage is selected from a group of passages consisting of (1) a sealing liquid introduction passage and (2) a sealing liquid vent passage.

2 . The method of claim 1 wherein the step of retasking includes:

installing a conical member on said pump head so that a port in said conical member forms a portion of said gas vent passage.

3 . The method of claim 2 wherein said passage selected for retasking is said passage forming said sealing liquid introduction passage.

4 . The method of claim 1 wherein the step of retasking includes that step of machining a channel in said pump head, said channel forming a portion of said passage selected.

5 . The method of claim 1 wherein the step of retasking includes piping said gas vent passage.

6 . The method of claim 3 comprising the further step of retasking a channel forming a portion of said sealing liquid vent passage into a channel forming a portion of a new sealing liquid introduction channel.

7 . The method of claim 6 wherein the step of retasking said channel forming a portion of said liquid vent passage includes sealing a portion of said channel forming said vent passage with a flange of said conical member.

8 . The method of claim 6 wherein the step of retasking includes machining said channel forming a portion of said sealing liquid vent passage.

9 . The method of claim 7 wherein the step of retasking said channel forming a portion of said sealing liquid vent passage includes aligning a sealing liquid channel in said conical member to form a part of said sealing introduction passage.

10 . A pump head of a liquid ring pump in combination with a conical port member comprising:

a passage in said pump head providing a gas vent passage in a portion of a pump having been retasked from a passage selected from a group of passages consisting of (1) a sealing liquid vent passage and (2) a sealing liquid introduction passage;

a port in said conical member providing a portion of said gas vent passage.

11 . The combination of claim 10 further comprising:

a flange of said conical member sealing a channel adjacent a sealing liquid introduction channel in said pump head, said sealing liquid introduction channel in said pump head in fluid communication with a sealing liquid channel in said conical port member.

12 . The combination of claim 10 further comprising a rotor with two successive rotor blades; and

wherein said port in said conical member has a closing edge and the angular distance from said closing edge to the opening of a final discharge port in the conical member is the angular distance between said two successive rotor blades of said pump to a tolerance of 7 angular degrees.

13 . The combination of claim 10 further comprising a rotor and a housing body; and wherein said conical member has a closing edge preferably 110 to 115 angular degrees before the closest approach of a rotor blade of said rotor to said housing body of said pump.

14 . The combination of claim 10 further comprising a rotor and a housing body; and wherein said port in said conical member has a leading edge preferably 130 to 146 angular degrees before the point of closest approach of a rotor blade of said rotor to said housing body.