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The control valve is a tool that directs the fluid to the actuator. This tool will consist of steel or cast iron spool that is situated within a housing. The spool slides to different locations in the housing. Intersecting channels and grooves route the fluid based on the spool's position.
The spool has a central or neutral position that is maintained by springs. In this position, the supply fluid is returned to the tank or blocked. If the spool is slid to a direction, the hydraulic fluid is routed to an actuator and provides a return path from the actuator to tank. If the spool is moved to the other side, the supply and return paths are switched. As soon as the spool is enabled to return to the neutral or center position, the actuator fluid paths become blocked, locking it into place.
Usually, directional control valves are made in order to be stackable. They normally have one valve for every hydraulic cylinder and one fluid input which supplies all the valves in the stack.
So as to prevent leaking and deal with the high pressure, tolerances are maintained extremely tight. Normally, the spools have a clearance with the housing of less than a thousandth of an inch or 25 µm. To be able to prevent distorting the valve block and jamming the valve's extremely sensitive parts, the valve block will be mounted to the machine' frame by a 3-point pattern.
The position of the spool may be actuated by mechanical levers, hydraulic pilot pressure, or solenoids which push the spool right or left. A seal allows a portion of the spool to protrude outside the housing where it is accessible to the actuator.
The main valve block is generally a stack of off the shelf directional control valves chosen by flow performance and capacity. Some valves are designed to be on-off, whereas some are designed to be proportional, like in flow rate proportional to valve position. The control valve is one of the most pricey and sensitive components of a hydraulic circuit.
In the material handling industry counterbalance forklifts are very popular pieces of machinery. They could be normally found in warehouses and factories all over the globe. The leading forklift producers such as Linde, Toyota and Mitsubishi all make counterbalance forklifts. They are accessible in a range of fuel alternatives like for example electric, gas or diesel. Typically, a counterbalanced forklift truck contains the following parts:
The Cab is the area that has a seat designed for the one operating it and houses the levels, steering wheel, a dashboard containing operating readouts, control pedals and different switches. The Truck Frame is the foundation of the machine that each of the other parts, the axles, wheels, power source, mast and counterweight are all connected to. The frame could even have hydraulic fluid tanks and fuel tanks constructed as part of its assembly. The Mast is the vertical assembly that does the majority of the work lowering and raising the forklift's load.
The counterweight is a heavy mass of cast iron that is connected to the back of the forklift truck frame. The counterweights' objective is to counterbalance all the cargo being carried. Using an electric forklift, the large lead-acid battery itself could serve as part of or all of the counterweight. The Power Supply can have an internal combustion engine that could be powered by gasoline, LP gas, CNG gas or diesel. Electric lift trucks are powered by either fuel cells which provide power to a battery or electric motors. The electric motors could be either AC or DC kinds.
Fork accessories are various types of material handling attachments that are offered comprising container handlers, carpet poles, pole handlers, side shifters, multipurpose clams, carton clamps, slip-sheet attachments, fork positioners and roll clamps.
When needing to park pallets closely together, the counterbalance lift truck is the ideal electric lift designed for the task. There are many benefits to using a counterbalance lift instead of fork-over and straddle-leg designs. They do have a few disadvantages however. A counterbalanced lift truck can lift pallets straight off the ground as there are no stabilization legs to get in the way. The main drawback of this particular unit of forklift is that the lift height and the weight capacity will usually be less than the different styles.
