# Patent

## Title
Dry working black image compositions comprising organic halogen

## Abstract

The purged fluid can be discharged into a drain or into the discharge of the pump as is done in the preferred embodiments. If a recirculated seal system is used the contaminants must be discharged separately and not returned with the seal liquid.

## Background
## Claims

1. A method of reducing wear in liquid ring pumps which would result from abrasive action of contaminants carried in the liquid of the ring which method comprises, .Iadd.determining the region where excessive wear would occur as a result of contaminants carried by the liquid ring.Iaddend., forming conduit means opening to the interior of the ring chamber at .[.a.]. .Iadd.said .Iaddend.region .[.where, but for that opening, excessive wear would occur.]. and during operation of the pump.Iadd., .Iaddend.purging a portion of the ring liquid and a substantial part of the contaminants of the ring through said conduit means.

2. A method of constructing a liquid ring pump which consists in determining where excessive wear results from contaminants carried by the liquid ring and forming conduit means opening to the ring at that location whereby in operation a portion of the ring liquid and a major part of the contaminants is purged from the interior of the pump through said conduit means.

3. A method of constructing a liquid ring pump of the type having a casing, a rotor disposed within the casing and having end shrouds between which extend a plurality of generally radial vanes which, with the shrouds, define displacement chambers, radially inner and outer ends of which are open, inner edges of the vanes defining a central eye, a fixed conical port member extending into the eye and having inlet and outlet ports with which the inner ends of the displacement chambers alternatively are brought into register as the rotor turns which method comprises determining where in such a pump excessive wear results from contaminants carried by the liquid ring and forming conduit means opening to the ring at that location whereby in operation a portion of the ring liquid and a major part of the contaminants is purged from the interior of the pump.

4. A method of constructing a liquid ring pump as claimed in claim 3 which comprises disposing said conduit means to communicate with the ring adjacent an end shroud of the rotor.

5. A method of constructing a liquid ring pump as claimed in claim 3 in which the liquid ring pump includes a head adjacent one of said shrouds said head defining with said one shroud an end shroud chamber, the method consisting of disposing said conduit means to communicate with said end shroud chamber.

6. The method of constructing a liquid ring pump as claimed in claim 3 which comprises disposing said conduit means to communiate with the ring at approximately 240.degree. from land in the direction of rotation of the rotor.

7. The method according to claim 4 wherein said opening is formed by machining through an existing wall of said pump.

8. The method of constructing a liquid ring pump as claimed in claim 5 which comprises disposing said conduit means to communicate with the end shroud chamber at approximately 240.degree. from land in the direction of rotation of the rotor.