Abstract: A seal face ring for use with a split mechanical seal, the ring having diametrically opposed grooves along at least a portion of the surface of the ring. The grooves provide lines of weakness for splitting the ring segmentally and are inclined relative to each other.

Abstract: A split mechanical seal incorporating a spring retainer is disclosed. The mechanical seal of the present invention is constructed to prevent fluid leakages from equipment having a fixed cavity, containing the fluid, and a rotatable shaft. The spring retainer of the invention includes an annular plate which receives and holds a spring in the correct position inside of a seal housing and a radially projecting member associated with the annular plate. Movement of the retainer under the action of the retained spring is stopped by the projecting member abutting an appropriately positioned projecting element on the inside of the seal housing, before the spring is fully extended. This feature prevents the spring from fully extending and, thus, retains it in position between the retainer and the internal wall of the seal housing.

Abstract: The invention provides a cartridge-mounted mechanical seal in which a set of bellows acts against the rotary component to urge its face into mating contact with the stationary component face, and wherein the stationary component is mounted in the seal so as to allow it a degree of pivotal movement, in use, relative to the stationary parts of an item of equipment in which the seal is used, about an axis perpendicular to the longitudinal axis of the seal, hence maintaining the stationary and rotary components substantially in alignment despite any out-of-squareness in the equipment.

Abstract: The invention provides a sleeve for a cartridge-mounted mechanical seal, the sleeve being formed from two connected-together metallic components. The first component is made from a material having a relatively high chemical resistance, the second from a material having a relatively lower chemical resistance. The arrangement of the components is such that, in use as part of a seal, the sleeve has only its first component in contact with the fluid whose escape is being sealed. Such a sleeve is easier and cheaper to produce than one made entirely from a high chemical resistance material, and yet just as effective in use. The invention also provides a seal including such a sleeve.