Abstract:
A mechanical seal for providing a fluid-tight seal between a rotating shaft and a stationary housing comprises a first pair of seal members for sealing and separating a process fluid from a barrier fluid. The first pair of seal members comprises a first rotatable seal ring having a rotary seal face and a first stationary seal ring having a stationary seal face engaging the rotary seal face. The first pair of seal members further includes generally radially extending piston areas on the rear sides of the primary seal members for biasing seal faces together. The piston areas are defined by a movable shuttle member that is connected to the rotary seal ring and a sleeve, which is in turn connected to the rotating shaft. Under normal operating conditions, the shuttle is moved to a first position to allow the process fluid to exert a force on a first piston area to bias the seal faces together. Under reverse operating conditions, when the barrier fluid pressure is greater than the process fluid pressure, the shuttle member is moved to a second position where it exerts a force, along with the barrier fluid, on a second piston area to bias the seal faces together.
Abstract:
There is disclosed a gland plate (21) comprising a rigid, disk-shaped element (30) including at least one radial extending wall (34) having a thickness of from 0.1 to 4mm.
Abstract:
A turbo fluid machinery comprising a primary dry gas seal (9) and a secondary dry gas seal (10), wherein a working gas leaking through clearances between rotating rings (7a, 7b) rotating together with a rotor (4) and fixed rings (8a, 8b) is detected by a pressure switch (14) and a flowmeter (15) installed in a primary seal vent line (12) if a leak amount is abnormal, a working gas leaking through clearances between a labyrinth seal (16) and the sealing surface (17) of the secondary dry gas seal is discharged through a flow path (34) to the outside of the machinery together with a purge gas purged from the outside to a space (18) after passing through a space (33) and, because a control valve (19) installed in a purge gas line acts so that the flow rate can be maintained in the purge gas line if an abnormality occurs at the secondary dry gas seal, the flow rate detected by the flowmeter installed in the purge gas line is increased and an abnormality of the secondary dry gas seal is detected.
Abstract:
Die Erfindung betrifft eine Wellendichtung (SHS) zur Abdichtung eines Spaltes (G) einer Durchführung (PT) einer Welle (S) durch ein Gehäuse (C), wobei diese Dichtflächen sich in einer Dichtebene (SEP) gegenüber stehen, wobei die Dichtebene (SEP) eine im Wesentlichen zur Welle (S) radiale Erstreckung aufweist, wobei die stehende Dichtfläche (SSS) und rotierende Dichtfläche (RSS) an einem Träger (RSUP, SSUP), nämlich einem stehenden Träger (SSUP) und einem rotierenden Träger (RSUP), befestigt sind, und die Dichtflächen (RSS, SSS) elastisch gegeneinander verspannt sind, indem entweder mindestens der stehende Träger (SSUP) oder der rotierende Träger (RSUP) mittels eines elastischen Elements (EEL) vorgespannt ist. Zu Vereinfachung wird neben einem Verfahren zum Betrieb vorgeschlagen, dass die innere Nebendichtung (SS2) mindestens eine erste Labyrinthdichtung (LTS1) aufweist und dass die innere Nebendichtung (SS2) mindestens eine Sperrfluidabsaugung (SLF) auf der äußeren Seite der ersten Labyrinthdichtung (LTS1) aufweist.
Abstract:
Die Erfindung betrifft eine Anordnung zur Wellendichtung einer Kreiselpumpeneinheit. Die Anordnung weist ein Modul (4) auf. Das Modul (4) umfasst eine erste Gleitring-Gegenring-Paarung (5) und eine zweite Gleitring-Gegenring-Paarung (6). Die Paarungen (5, 6) sind in Tandemanordnung zueinander positioniert. Jeder Paarung (5, 6) ist ein Federelement (11, 12) zugeordnet. Die Federelemente (11, 12) erzeugen eine Anpresskraft zwischen Gleitring (9, 10) und Gegenring (7, 8). Ein Raum zwischen den Gleitring-Gegenring-Paarungen (5, 6) wird mit einer Flüssigkeit aus einer Vorlage (22) gespült. Die Federelemente (11, 12) sind in stationären Bauteilen angeordnet.
Abstract:
A double mechanical seal assembly for sealing around the shaft of a centrifugal pump, a shaft sleeve that surrounds a portion of the shaft, and has an inner surface with a notch, the notch corresponding to a key on the shaft that engages the notch to transmit torque from the shaft to the shaft sleeve, an annular seal sleeve that surrounds the shaft sleeve and is engaged with the shaft sleeve, and rotating inboard outboard seals, each having a rotating seal face and operably associated. The seal assembly also includes stationary inboard and outboard seals each having a stationary seal face, the stationary seal face of the stationary inboard seal sealingly engaged with the rotating seal face of the rotating inboard seal and the stationary seal face of the stationary outboard seal sealingly engaged with the rotating seal face of the rotating outboard seal.
Abstract:
The present invention relates to a new kind of a slide ring (110, 112, 114, 116) and a mechanical seal, so called slide ring seal used, for example, for sealing a shaft space of a centrifugal pump in relation to a pumping space thereof. The present invention also relates to coupling said mechanical seal to a housing (130), to a shaft (120) and to a rotor (142) of a flow machine.