The present invention relates to a device for reducing energy losses in a machinery unit (1), having at least one part (4) which is arranged to rotate in fluid about a rotation axis (6) in a substantially closed chamber (3) delimited in the radially outward direction by means of a wall (18) extending around the rotation axis. The wall (18) has a radially inward facing wall surface (10) extending wholly or partially around the revolution, which wall surface is highly smooth and extends close to, ...

An arrangement for controlling two drive units which interact with one another, one of which includes a hydraulically driven motor (2). The motor drives a varying load, and one or more valves (6, 7) control hydraulic fluid flow through the motor during operation and for starting and stopping of the motor. One of the valves is a flow control valve (7) for flow control of the hydraulic fluid flow through the motor. The second drive unit (37) performs a working movement which, under the action of h...

An apparatus for sensing movement of a first object relative to a second object. The apparatus includes indicia markings formed on the first object and a sensor capable of reading the indicia markings. A slipper element is secured relative to the sensor and is biased into engagement with the first object. The slipper element maintains the sensor within a predetermined range of distances from the indicia markings on the first object. In one embodiment, the first object is a piston rod of a piston...

A lost motion mechanism that is operatively interconnected with a hydraulic cylinder is provided. The lost motion mechanism includes an elongated rod connected with a portion of the hydraulic cylinder. An elongated sleeve member is adapted to receive at least a portion of the rod extension. The sleeve member includes at least one slot of a predetermined length. At least one pin member is attached relative to the rod extension and protrudes into the at least one slot. The pin member together with...

A method of fluidly connecting coaxially aligned first and second couplings (50, 130), wherein the both couplings (50, 130) have an inner high pressure passage (26) and a coaxial outer lower pressure passage (53). Initially the first coupling inner high pressure passage (26) is fluidly connected with the first outer lower pressure passage (53) while isolating the second coupling inner high pressure passage (166) and the coaxial outer lower pressure passage (151). Then the first coupling inner hi...

A variable speed wind turbine utilizes a hydraulic transmission including a hydraulic pump coupled to a rotor and a hydraulic motor coupled to an induction generator to produce variable frequency power that is converted to grid frequency power by electronic controls.

The present invention relates to an arrangement for controlling a hydraulically driven motor (2), forming part of a hydraulic system in which hydraulic fluid under pressure forms a main flow through a main duct (1) in which the motor is connected. The motor is adapted to drive a load with varying loading, and one or more valves (6, 7) are adapted for controlling the hydraulic fluid flow through the motor on the one hand during operation and on the other hand for starting and stopping of the moto...

A service valve for a refrigerant system comprising a valve body and a system port. The valve body has at least one fluid passage integrated therein including a longitudinal bore. An orifice is located at one end of the bore. An annular protrusion axially extends from the valve body and is symmetrical about the orifice. A valve seat generally surrounds the orifice. The system port includes a valve stem having a first end, a second end, and a bore integrated within. The stem is axially movable wi...

A folding stand adapted to be secured to the bottom wall of a portable crimping device which, in a folded position, is substantially flat against a wall portion thereof and, in an unfolded position, vertically raises the crimping device to a predetermined working height, the folding stand including a base portion, having a rear pivot axis, a mounting portion, having a front pivot axis, and a pair of elongated cross members for interconnecting the base and mounting portions, via oppositely direct...

Improvement in a combination valve including check valve and pressure relief valve portions for regulating fluid flow pressure and direction in a hydraulic circuit, wherein a valve seat includes, in addition to a central aperture, a plurality of peripherally-spaced axial cross-port orifice holes, of same or differing diameter and a plurality of intersecting, circumferentially-spaced, radial, semicircular holes; a spring cap including four adjoining axial portions of differing outer diameters, wi...