Abstract: A seal for a gas isolator comprises a cantilever leaf spring (1) attached to a fixed frame or a movable member (2) of the isolator, and a bias spring (3) acting on the leaf spring, and a bar (4) disposed below the seal for clamping and supporting the latter, characterized by at least one additional damping element which will usually comprise a further leaf spring (7), and characterized in that the clamping/support bar (4) is of reduced width.

Abstract: A blade for an isolator, in particular for a diverter or flap isolator, which comprises a plurality of plate arms (21) to be attached to an isolator shaft (31), and a pair of plates (22), preferably comprising an array of panels, attached to the plate arms (21) and separated by a gas space (23). The plates (22) are suitably provided with insulation (27) retained by cladding (28). The blade plates (22) will usually be provided with convolutions (24) to give them improved stiffness, and the blade plates will furthermore be welded or otherwise secured together by fastening means such as a series of short tubes (25) extending therebetween.

Abstract: A hydraulic actuator for an isolator, comprising a casing (1) having a flange (1a) to be mounted to the isolator to be driven, a lever arm assembly (2) connected at each end thereof to a respective one of a pair of identical double acting cylindrical rams (3), the other ends of the rams being respectively connected to opposite ends of the casing remote from the flange, wherein the identical rams are arranged to operate in opposite directions, the radial load exerted by one ram being equal in magnitude but opposite in direction to the radial load exerted by the other ram.

Abstract: A diverter valve (10) provided at a three-way junction through which passes a high temperature gas, the valve having a closure member (12, 13, 14) pivotable between a first position in which it closes a first outlet branch of the junction and a second position in which it closes a second outlet branch of the junction, wherein the closure member carries one or more deflecting vanes (16) positioned (a) in front of the closure member so as to direct the flow of gas into and through the first outlet branch when the closure member closes the second outlet branch and (b) to be hidden behind the closure member and to be isolated from contact with the gas flowing into and through the second outlet branch when the closure member closes the first outlet branch.

Abstract: An isolator including a combined blade and flap arm assembly in which two opposed side members (22) of a blade frame (31) are extended (22a) to attach to an operating shaft (21) to act as the load-bearing members of the system, the frame being completed by two opposed side members (23) oriented parallel to the shaft. Preferably insulation (37) is provided on one side only of a blade plate (33) attached in a flexible manner to a cross-sectionally generally channel-shaped blade frame by being either welded or bolted to at least one strip (34 or 34a, 34b, or 41, 42) welded to the frame. The blade designed in accordance with the present invention will accept differential expansion due to operational conditions while retaining the lightest possible construction.

Abstract: An isolator which includes an isolator shaft, an isolator closure, e.g., a valve plate, carried by the isolator shaft, a hydraulic actuator for the isolator shaft, an auxiliary shaft equipped with at least one element for driving at least one extraneous device, e.g., a limit switch, and a coupling drivingly interconnecting the isolator shaft with the auxiliary shaft. The hydraulic actuator includes a casing which has an exterior mounting flange at one end for connection to the isolator and internally houses a hydraulic ram and a lever arm assembly, with the ram being articulated at one end to the lever arm assembly and at the other end to the end of the casing remote from the flange.

Abstract: A cantilever leaf spring (1) attached to a fixed frame or movable member of a gas isolator is acted on by a bias spring (2) and an additional similar, but not identical, bias spring (12).

Abstract: A seal for a gas isolator which comprises a cantilever leaf spring to be attached to a fixed frame or a movable member of the isolator and a bias spring acting on the leaf spring, wherein the leaf spring is bent or curved when unstressed whereby in the sealing position of the seal the stress induced in the bias spring will be the same as that induced in the leaf spring where the bias spring and the leaf spring seal have the same section modulus per unit length of seal.

Abstract: A bearing system fitted around a shaft of an isolator, comprising a shaft seal fitted around the shaft, the shaft seal comprising at least one flexible annular metal disc attached to the isolator frame, and a bearing fitted around the shaft at a location spaced from the shaft seal, the bearing comprising at least three individually removable bearing segments secured to a bearing mounting by means of at least one flexible annular diaphragm.