Abstract:
In cold flow processing of metals, especially steel, coatings of transition metal halogenides, especially FeCl3, have proved suitable because they efficiently counteract cold welding problems. The coatings may be applied in the form of a melt or a saturated or diluted, aqueous solution of the transition metal halogenide. If a melt is used, it may be mixed with one or more common solid lubricants such as MoS2, graphite, or the like.
Abstract:
A control arrangement for cooling of apparatus comprising a compressor (1), a condenser (2) and at least one branch (3) with an expansion valve (4) and an evaporator (5) in series, contains a controller (6), a superheat temperature measuring device (8) and an ambient temperature sensor (7). The controller (6) controls the expansion valve (4) for maintaining the superheat temperature substantially at the desired value. The flow of coolant to the evaporator (5) is controlled by the signal from the temperature sensor (7) for maintaining the ambient temperature constant. The controller (6) operates continuously and in two operating modes in which in the first mode the superheat temperature is controlled to the maximum admissible state of fill of liquid coolant in the evaporator (5), and is switchable to a second mode in which the state of fill of liquid coolant is controlled by the expansion valve (4).
Abstract:
A control arrangement for the temperature of the water drawn from a water pipe (5) contains a heat exchanger (3) lying with its primary side in series with a flow-adjusting valve (4) in a heated water circuit (2), and with its secondary side in the water pipe (5), a temperature sensor (6) lying in the water pipe (5) downstream of the heat exchanger (3), which temperature sensor converts the measured temperature into a pressure acting on a closure member of the flow-adjusting valve (4) against the force of a spring bearing against the housing (16) of the flow-adjusting valve (4), and a measuring orifice (7) in the water pipe (5). The flow-adjusting valve (4) contains a diaphragm between two chambers (10, 11), of which one (10) is connected to the high pressure side of the measuring orifice (7) and the other (11) is connected to the low pressure side of the measuring orifice (7). The deflection of the diaphragm (9) caused by the differential pressure at the measuring orifice (7) acts against the pressure of the temperature sensor (6) on the closure member of the flow-adjusting valve (4). To provide an energy-saving control arrangement, the diaphragm is rigidly connected to the closure member of the flow-adjusting valve (4) in the closing direction thereof, and its deflection in the opening direction of the flow-adjusting valve (4) is continually correlated with the pressure difference at the measuring orifice (7) and the difference between the spring force and the pressure force of the temperature sensor.
Abstract:
A hydraulic axial piston machine (1) is disclosed, having a cylinder drum (2), which has at least one cylinder (5) in which a piston (9) is arranged to move back and forth, and having a control plate (3), which on rotation of the cylinder drum (2) and control plate (3) relative to one another connects the cylinder (5), in dependence on its position, to a fluid inlet and a fluid outlet (4), a pressure plate (6) being arranged between the cylinder drum (2) and the control plate (3) and having for each cylinder (5) a fluid path (14) between the control plate (3) and the cylinder drum (2). It is desirable for such a machine to be capable of operation also with a hydraulic fluid that has no or only slight lubricating properties. To that end, the cylinder (5) is lined with a bushing (10) of a friction-reducing plastics material which projects from the cylinder drum (2) and is inserted in the pressure plate (6).
Abstract:
A method is disclosed for calibrating an analysis system having a membrane (2), the outside of which is in contact with a medium (3) to be analyzed, in order to detect a concentration of a species there, and a corresponding analysis system. In this connection it is desirable to be able to perform a calibration in situ. In this calibration, a first fluid (9) of a predetermined first concentration of the species is conveyed along the inside of the membrane (2), at least a second fluid (12) of a predetermined second concentration which differs from the first concentration is likewise conveyed past the inside of the membrane and the concentrations of the two fluids (9, 12) after passing the inside of the membrane are recorded. From these concentrations, parameters for a correlation between the concentration on the outside of the membrane (2) and a measurement signal are ascertained.
Abstract:
A plug and socket type connector for connecting two electrical leads has a flat-pin plug part (2) of a first standard size and joined thereto in one piece a socket part (1) of a second standard size. It therefore allows a plug and socket type connection between a conventional socket of a first standard size which is joined to a first lead and a flat-pin plug of a second standard size which is joined to a second lead.
Abstract:
A valve, especially a thermostatic expansion valve, has a setpoint spring (15) which bears on a plate (14) having a sloping face (19). A setpoint adjusting device (5) is provided in a housing connecting tube (4). The adjusting device has a pressure-applying piece (21) having a contact face (20) engaging the sloping face (19), is secured against rotation and has a threaded bore (22). An adjusting screw (27) which is supported on the connecting tube (4) against axial displacement engages in this threaded bore. In this construction, the connecting tube requires no machining.
Abstract:
A hydraulic control system (1) for work vehicles including a control unit (2) to control the steering wheels of a vehicle via a cylinder (3) and a priority valve (4) which by means of a first load-sensing system (LS1) controls the pressure fluid flow to the control unit (2) and to a subsequent proportional valve group (9a-9c). By means of a second load-sensing system (LS2) the proportional valve group (9a-9c) controls the pressure fluid flow to secondary hydraulic motors (10) or work cylinders (11, 12) to control the work tools of the vehicle. The control system (1) also includes an open-centre valve connection (6) and a fixed displacement pump (8). The first load-sensing system (LS1) is connected with a second load-sensing system (LS2), whereby drop-off of the pressure fluid flow to the control unit (2) is avoided at simultaneous operation of the latter and of one or several of the proportional valves (9a-9c) as it is the case with known control systems. Hereby a control system is provided which is particularly agreeable to operate for the driver of the work vehicle.
Abstract:
A radial journal bearing (5, 6) is indicated, with an interior bearing surface placed facing an exterior bearing surface, where one of the bearing surfaces comprises a slide shoe (7, 8), which has one end with a contact face loaded to contact against the other bearing surface, and where this end is movable in such a manner that the contact against the other bearing surface can be maintained by a relative displacement of the bearing surface at right angles to the direction of the load. Hereby it is achieved that the variation of the leakage between the slide shoe and the opposing bearing surface is essentially reduced, resulting in longer life and greater stability.
Abstract:
A hydraulic piston engine (1) driven by a lubricant-free, water-based pressure fluid, and comprising an enclosing housing (2) and a piston-connected drive shaft (6) supported by radial journal bearings in bearing bushings (9). One of the sliding surfaces (8) of the radial journal bearing comprises a recess (11) with a bearing-supporting hydrostatic pressure fluid pocket. The centre of the recess (11) is displaced by an angle ( alpha ) in the direction against the direction of rotation of the drive shaft (6), seen in relation to the geometrical, radial mean point in the high-load area for transmission of the piston forces to the bearing surface (8) via the drive shaft (6). Hereby a particularly reliable piston motor of the type indicated is provided.