Hydraulic welding application

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A hydraulic system can be used for holding and positioning the parts to be welded during a welding operation. It is a typical example of how fluid power can be used in manufacturing and production operations, to reduce the overall costs and to increase production. This application requires a sequencing system for fast and positive …

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High wire hydraulically driven overhead tram

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Most overhead trams require haulage or tow cable to travel up and down steep inclines. A 22-passenger, 12 000 pound (around 5000 kg) hydraulically powered and controlled tram is shown in Figure 9.2. It is self-propelled and travels on a stationary cable. Since the tram moves instead of the cables, the operator can easily start, …

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Hydraulic accumulator as shock absorber

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One of the most important industrial applications of accumulators is in the elimination or reduction of high-pressure pulsations or hydraulic shocks. Hydraulic shock (or water hammer, as it is frequently called) is caused by the sudden stoppage or deceleration of a hydraulic fluid flowing at a relatively higher velocity in the pipelines. This hydraulic shock …

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Directly Operated Proportional Directional Valve

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Directly Operated Proportional Directional Valve

In connection with this valve, the points applicable to the following proportional directional valves will also be discussed by way of example such as hysteresis, repetition accuracy, control spool, basic principles tor characteristic curves and the time characteristics of the control spool. The proportional solenoid acts directly on the control spool in the same way …

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Stroke-Controlled Proportional Solenoid

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Stroke-Controlled Proportional Solenoid

In the case ol the stroke-controlled solenoid (Fig 10). the position of the armature is controlled by a ciosed-loop control circuit and maintained irrespective of the counter-pressure. provided it is within the rated working range of the solenoid. With the stroke-controlled solenoid, the spools of proportional directional, flow as well as pressure control valves can …

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Force-controlled Proportional Solenoid

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Force-controlled Proportional Solenoid

The solenoid force is controlled by the change in current I in the lorce-controlled solenoid without the armature of the solenoid performing a measurable stroke. Due to current feedback in the electrical amplifier, the solenoid current and therefore the solenoid force are kept constant even if resistance changes. The main feature of the force-controlled proportional …

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2-Way Proportional Throttle Valve

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This combination unit, can be used as a throttle (orifice) or in conjunction with a pressure compensator for controlling high flows The applications include, for example. control systems for presses and plastic processing machines Despite the high flow rates, the unit has a fast response time. The 2-way throttle valve is an orifice with its …

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2-Way Proportional Flow Control Valve with Downstream Pressure Compensator

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The 2-way proportional flow control valve can control, independent o’ pressure and temperature, oil flow specified by the electrical signal. The most important components are the housing (t). the proportional solenoid with inductive positional transducer (2), the measuring orifice (3). the pressure compensator (4) as well as the optionally installed non-return valve (5). The oil …

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Directly Operated Proportional Pressure Relief Valve

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The proportional pressure relief valve is designed as a poppet valve It basically consists of the housing (1), proportional solenoid (2) with inductive positional transducer (3), valve seat (4), valve poppet (5) as well as compression spring (6) The proportional solenoid is a position controlled solenoid. In this case, it replaces to a certain extent …

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