Abstract: Valve, in particular large ball valve for use in oil and gas installations, of the kind comprising a valve member (2) having a through flow passage (6), a movable seat or seal holder (8, 9) and means (11, 12) for moving the holder in directions towards and from cooperating parts (21, 22) of the valve member. At least one opening from the flow passage (6) is surrounded by a protruding edge portion (20) provided with an annular sealing surface (21). A front portion (17) of the seat or seal holder (8, 9) also has an annular sealing surface (18) adapted to cooperate with the sealing surface (21) on the valve member (21) in the open position thereof (FIG. 1B). Outwardly of its sealing surface (18) the front portion (17) has a seal member (19) adapted to cooperate with a second sealing surface (22) on the valve member (2) in the closed position thereof (FIG. 1A).

Abstract: Converter group comprising at least two pressure converters adapted to be mounted in a row axially above the drill bit at the lower end of a drill pipe for deep drilling, in particular for oil and gas, and for generating an increased fluid pressure utilizing energy in a drilling fluid flow down through the drill pipe, so as to obtain an enhanced drilling effect, preferably by means of one or more high pressure jets adapted to have a cutting action in a surrounding rock formation. Pressure converters (20A, 20B) have axially abutting end faces (22A, 22B) of spherical shape. Attachment means for axial interconnection of the pressure converters are resilient or flexible so as to make possible a certain, small freedom of angular movement between the axes of the pressure converters.

Abstract: A pressure converter for deep drilling keeps contaminated drill mud outside of the working mechanisms of the drill fluid. Thus, the inner drill mechanisms are kept clean by drill fluid. The device contains a rotatable valve positioned above the controlling piston. A tap cover, containing the valve, has two diametrically opposed inlets and two diametrically opposed outlets. The valve has a through passage which is connected to the inlets when the valve is in a second position. Thus, when the piston is operating in a return fashion, the drilling fluid is provided to the area beneath the piston head, keeping this area clean of drill mud.

Abstract: A valve apparatus, in particular a rotatable valve comprising an upper part (10) and a lower part (6) which are demountably attached to each other. The valve's lower part (6) is mainly U-formed with sealing surfaces (17,18) arranged on the outwardly facing side faces, which sealing surfaces, in the case of closed valve bear against at least one valve seat on the valve housing's inlet and/or outlet end, and upper part's (10) external face is designed for totally or partly supporting bearing against lower part's (6) internal face and comprising a passage (34) designed to accommodate equipment, for example controlling or metering instruments in the upper part (10) can, in the case of closed valve, be lifted out of the valve housing (1) for maintenance.

Abstract: In one aspect the invention relates to a ball valve of the type comprising a ball member (83, 85) provided with two axially displaceable sleeves (66A, 66B) adapted to be displaced outwards to sealing engagement against seats provided in the surrounding valve housing (76) in the open position of the valve, so as to form a flow passage (73) through the valve, and which comprises a hollow drive axle for the rotary movement of the ball member between open and closed position and a drive spindle (12, 69) through the hollow drive axle, adapted to bringing about the axial displacement movement of the sleeves. On the drive spindle (69) and for rotation together with it there are provided two preferably disc shaped, first cam members (68A, 68B) on either side of the sleeves (66A, 66B) and the sleeves are provided with corresponding and cooperating second cam members (67A,67B) for the axial displacement by rotation of the drive spindle (69) in relation to the ball member (83, 85).