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The control valve is actually a tool that routes the fluid to the actuator. This tool would consist of steel or cast iron spool which is positioned within a housing. The spool slides to different locations inside the housing. Intersecting channels and grooves direct the fluid based on the spool's location.
The spool has a central or neutral position that is maintained with springs. In this position, the supply fluid is blocked or returned to the tank. If the spool is slid to a side, the hydraulic fluid is directed to an actuator and provides a return path from the actuator to tank. If the spool is transferred to the opposite direction, the supply and return paths are switched. As soon as the spool is enabled to return to the center or neutral location, the actuator fluid paths become blocked, locking it into place.
The directional control is usually made to be stackable. They usually have a valve per hydraulic cylinder and a fluid input which supplies all the valves inside the stack.
Tolerances are maintained very tightly, so as to handle the higher pressures and to be able to avoid leaking. The spools would normally have a clearance in the housing no less than 25 µm or a thousandth of an inch. So as to prevent jamming the valve's extremely sensitive components and distorting the valve, the valve block will be mounted to the machine' frame with a 3-point pattern.
The position of the spool could be actuated by mechanical levers, hydraulic pilot pressure, or solenoids that push the spool right or left. A seal allows a portion of the spool to stick out the housing where it is accessible to the actuator.
The main valve block is normally a stack of off the shelf directional control valves chosen by capacity and flow performance. Several valves are designed to be on-off, while others are designed to be proportional, like in valve position to flow rate proportional. The control valve is one of the most sensitive and pricey parts of a hydraulic circuit.
Counterbalance lift trucks are really common pieces of machinery in the material handling trade. They are really common machinery utilized in warehouses and factories around the world. The leading lift truck makers like for instance Mitsubishi, Linde and Toyota all create counterbalance lift trucks. They are available in a range of fuel options such as electric, gas or diesel. Typically, a counterbalanced forklift truck comprise the following components:
The Cab is the part which has a seat meant for the person operating it and houses the levels, steering wheel, a dashboard containing operating readouts, control pedals and various switches. The Truck Frame is the base of the equipments that each of the other parts, mast and counterweight, the axles, wheels, power source are all connected to. The frame might likewise have fuel tanks and hydraulic fuel tanks constructed as part of its assembly. The Mast is the vertical assembly that does most of the work raising and lowering the forklift's load.
The counterweight is a heavy mass of cast iron which is connected to the rear of the forklift truck frame. The counterweights' purpose is to balance the cargo being lifted. Utilizing an electric forklift, the big lead-acid battery itself can serve as part of or all of the counterbalance. The Power Supply could have an internal combustion engine that can be powered by CNG gas, diesel, gasoline or LP gas. Electric lift trucks are powered by either fuel cells that provide power to a battery or electric motors. The electric motors may be either AC or DC kinds.
Fork attachments are numerous kinds of material handling attachments which are available consisting of roll clamps, container handlers, carpet poles, pole handlers, side shifters, multipurpose clams, carton clamps, slip-sheet attachments and fork positioners.
When needing to park pallets closely together, the counterbalance lift truck is the ideal electric lift meant for the job. There are a lot of benefits to using a counterbalance lift over fork-over and straddle-leg designs. They do have several disadvantages however. A counterbalanced lift truck can lift pallets straight off the floor as there are no stabilization legs to get in the way. The main disadvantage of this particular model of forklift is that the weight capacity and lift height would generally be less than the other styles.
