Abstract: A sealing device for a reciprocating pump of the type having a pump housing provided with a bore formed therein. The bore is provided at its one end with an opening through which it communicates with the exterior of the pump housing while the other end of the bore receives a reciprocating member such as a plunger. The sealing device includes a seal case received in the bore and having a bore through which the reciprocating member extends, a sealing member such as a packing held on the inner periphery of the seal case and having an inner peripheral surface adapted to be slidingly contacted by the outer peripheral surface of the reciprocating member, a closure separate from the pump housing and removably attached to the pump housing so as to close the opening on the one end of the bore, and a coiled compression spring loaded between the closure and either one of the seal case and the sealing member.
Abstract: The face seal of a centrifugal pump has a stationary seal component mounted on the pump casing and a rotary seal component rotatable with the drive shaft extending into the casing and connected to the inner rotary pumping member or impeller. The rotary seal component is biased against the stationary seal component by a resilient welded metal bellows assembly having its end portion opposite the rotary seal component clamped to the drive shaft. To protect the welded metal bellows assembly against abrasive life-shortening contact with particulates in the liquid being pumped, a rigid shroud is provided including a generally cylindrical cavity having an inner wall portion extending close alongside the bellows for at least substantially the full axial extent of the bellows.
Abstract: An FIP (Formed In Place) gasket arrangement includes three hollow parts which are joined with each other in such a way as to sealingly separate the inside and outside thereof. Two of the parts have surfaces which are flush with each other and adjoin at a line extending between the inside and outside of the two parts. The remaining one of the parts has a surface joined with the surfaces of the two parts by interposing therebetween an FIP gasket. The two parts also have edges extending along the above mentioned line, one of the edges being partially chamferred to provide a chamber. The FIP gasket has a portion filling the chamber.
Abstract: A housing has an opening therein, a rod extends within the opening in the housing, and an annular seal arrangement is provided around the rod within the opening for effecting a fluid seal between the housing and the rod with respect to a fluid pressure which is present at a location along the rod on one axial side of the seal arrangement. The seal arrangement includes an annular washer part which is provided closely around the rod and an annular sleeve part axially adjacent the annular washer part, the annular sleeve part having an inside dimension which is less than an outside dimension of the washer part and which is substantially greater than an inside dimension of the washer part and an outside dimension of the rod. The washer part is located on a side of the sleeve part axially remote from the location at which the fluid pressure is present.
Abstract: Means for preventing relative twisting between a seal ring and the parts of structure accommodating it by providing that in connection with high pressure shaft seals, the axial thrust resulting from the action of the pressure of the seal ring on its low pressure side radial face is taken up by a number of projections, the cross section of the seal ring undergoing undulating deformation as seen in the circumferential direction owing to the axial flexure of individual parts of the seal ring; it is furthermore possible to have additional projections as means for preventing twisting. As a consequence of the undulation of the entire cross section of the seal ring there will also be the useful effect of undulation of the seal interface edge, constituted by parts of this cross section, on the high pressure side.
Abstract: A slide ring seal for sealing the gap between a rotatable shaft (1) and a fixed wall (2) to separate a space (3) for a pressure fluid from the external space (4). The slide ring seal comprises at least one seal ring (5) mounted on a fixed wall or a shaft and at least one face ring (6) secured to said shaft or fixed wall. The seal ring and face ring are provided with sealing slide surfaces that are axially pressed against one another. Moreover, the seal ring is mounted on said fixed wall or shaft through a bellows member (7). To achieve a slide ring seal being reliable in operation and having controlled sealing properties, the bellows member (7) is isolated from the space (3) for the pressure fluid by means of a sealed space (9). Said sealed space (9) is further connected to a regulable pressure source (11) by means of a conduit (10).
Abstract: A seal between an object such as a cable, cable splice or branch-off, and a surface such as a recoverable sleeve by means of a flexible envelope containing a void-filling composition. The void-filling composition undergoes a change from a low viscosity on installation, which allows the flexible envelope to conform to the object, to a high viscosity after installation, which gives mechanical strength to the seal. Deformation of the flexible envelope on installation may be brought about by installation of the recoverable sleeve or other surrounding surface.
July 27, 1983
Date of Patent:
August 11, 1987
Robert L. Hall, Joris R. I. Franckx, Noel M. M. Overbergh, Jos Doucet, Jan Vansant
Abstract: A sealing element which is particularly adapted for use in preventing fluid flow between threadably interconnected components. The sealing element comprises a rigid portion formed of metal or the like and an elastomeric material portion. These portions are assembled together in a geometric configuration that protects the elastomer from shear forces and at the same time permits close control over the compression forces which can be exerted on the elastomeric portion of the sealing element. In this way, both overcompression and shear damage to the elastomer are effectively prevented.
Abstract: A liquid sealed shaft seal for a rotatable shaft comprises a housing disposed around the shaft and defining a seal chamber which can be supplied with sealing liquid. A seal disc is fixed to the shaft and extends into the chamber. An axially movable piston is mounted on the housing for axial movement toward and away from a side face of the seal disc. The piston is provided with a slide ring which engages the slide disc when the shaft is at a standstill and which, through a circumferentially induced increase in pressure for the sealing liquid in the chamber, is moved axially away from the disc when the shaft and disc rotate. A resilient bellows is connected between the piston and the housing for biasing the piston toward the disc.
Abstract: A seal gland for a pump shaft made of plastic material and adapted to retain a ceramic seal seat and having an annular groove for circulating cooling fluid around the periphery of the seal seat. The seal gland has an internal cavity part with an inlet and outlet for cooling fluid to be circulated through the gland. Another outlet provides cooling water for flowing around the seal seat through a hole in the supporting groove of the seal gland.
Abstract: A mechanical spring seal comprising in combination an elastomeric jacket and a resilient spring insert having modified and matching C-shaped cross-sectional configurations. The major portion of the length of the spring follows a relatively straight path between a curved base and a position along the cross section at which the spring is widest, forming a pair of opposed cantilever arms which provide the major sealing force. From this region of greatest width to the tips of the spring, the curvature is substantially sharper, enabling the end of the spring to fit in fixed locked position within the jacket which conforms to it. At the base of the C-shaped spring, the curvature is also sharper than it is in the long cantilever arm portions.
Abstract: A mechanical seal for reversing a flow of leakage between a rotational shaft and an inner wall of a stuffing box in a centrifugal pump is provided. The seal is ensured by a cylindrical flow-reversing impeller secured to the shaft to rotate as the shaft rotates, having flow-reversing means at the front end of the impeller. The flow-reversing means is positioned in a space defined between the shaft and the inner wall of the stuffing box. O-ring means are provided to prevent leakage during periods of non-rotation of the shaft, and securing means provide selective securing of the O-ring means.
Abstract: A sealing device for a pipe connection requires tighty clamping a sealing ring (1') made of elastomeric material in a socket and of a pipe section for the subsequent insertion of a plug-in end of an adjacent pipe section. An endless expanding ring (2) made of steel is held in an inwardly facing groove and butts in a gap-less manner against the base or bottom surface of an inwardly open groove (3) in the sealing ring (1'). The expanding ring (2) of steel is deformed by radially outwardly forces to increase the diameter of the steel ring slightly beyond the elastic limit of the steel of which the ring (2) is made. Thus, the circular outer periphery of the steel ring is still maintained even after the radially outwardly directed forces are removed, whereby the sealing device is locked in the socket against undesired displacement of the sealing ring (1').
Abstract: A seal for a large annular opening between two generally cylindrical surfaces. The seal being formed of a first portion having a base ring and a toroidal shaped arcuate portion extending from the central portion of the base ring, a lip portion extending radially inwardly and toward the high pressure portion from the end of the arcuate portion and a second portion having a base ring, both base rings being affixed to one of the cylindrical surfaces. The second base ring being disposed on the high pressure side of the first base ring and there being ribbons extending between the first portion and the second portion. The ribbons being made of a high strength material and being disposed on a predetermined pitch and attaching the free end of the first portion to the second portion to prevent the arcuate toroidal shaped portion from inverting, even though it is compliant and deforms substantially under pressure.
Abstract: A device for sealing the gap between the inlet end of a rotary kiln and a stationary inlet housing. In this device a ring which is capable of sliding in the axial direction is supported on a stationary ring by at least one first annular sealing element, and the sliding ring has on its end facing the rotary kiln a first wearing surface which co-operates with a second wearing surface on a rotating ring fixed on the inlet end of the rotary kiln. Cylinders operated by a pressure medium urge the sliding ring in a direction towards the inlet end of the rotary kiln and hold the two wearing surfaces in close sealing contact with one another. To ensure that the sealing contact of the wearing surfaces can be maintained even with relatively long rotary kilns in all states (cold and hot), the sliding ring includes a plurality of ring elements which are concentric and telescopic.
Abstract: A secondary sealing element for axial seal rings, is resistant to stresses due to temperature, pressure, vibration, corrosion, swelling and shrinking. This sealing element is produced of non-rubber-type elastic and non brittle material and its shape, in cross-section, consists of a ring, with a pair of arms to give it an elastic reaction. The double-arm ring forms three radial-type sealing surfaces and is completely locked into a chamber. Special material with low static friction and higher thermal conductivity than rubber material is used. Furthermore the dissipation of heat, produced by the axial sliding rings, will be increased through the double contact area to the shaft by the arms in comparison to an O-ring, and through a wear-resistant and non-corrosive layer on the shaft having at least the thermal conductivity of the basic material.
Abstract: Disclosed is a snap action circuit breaker with a compact one piece steel frame in a two part, telescoping molded circuit breaker case. The compact construction is combined with a symmetrical toggle actuator to provide a pleasing appearance suitable for mounting at readily accessible and visible locations on the front of an instrument panel. A variety of handle constructions are usable with the same basic mechanism. By providing a snap actuated contact construction with substantial overcurrent trip delay the device combines the best features of modern manual switches and circuit breakers so that it is in effect a manual switch with nuisance free over-current trip protection.
Abstract: A valve system for use in inflating packers mounted on mandrels. The valve system uses one or more valves to permit, through the use of seals, the flow of fluid from the interior of a tubular mandrel to the interior of the inflatable packer when pressure applied in the mandrel exceeds at least a minimum pressure. The differential pressure across reciprocating seals is minimized through exposure of one or both sides, directly or indirectly, to the external pressure of the mandrel and packer, the exposure including the use of a check valve to permit flow from the exterior of the mandrel.