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The function of directional control valves is to be able to direct the fluid to the desired actuator. Normally, these control valves consist of a spool situated within a housing created either of cast iron or steel. The spool slides to various locations inside the housing. Intersecting grooves and channels route the fluid based on the spool's location.
The spool has a central or neutral position that is maintained with springs. In this particular position, the supply fluid is blocked or returned to the tank. When the spool is slid to one direction, the hydraulic fluid is directed to an actuator and provides a return path from the actuator to tank. When the spool is moved to the other side, the return and supply paths are switched. When the spool is allowed to return to the center or neutral position, the actuator fluid paths become blocked, locking it into place.
The directional control is normally made to be stackable. They generally have one valve per hydraulic cylinder and a fluid input which supplies all the valves within the stack.
Tolerances are maintained very tightly, to be able to handle the higher pressures and to be able to avoid leaking. The spools will often have a clearance within the housing no less than 25 µm or a thousandth of an inch. So as to prevent jamming the valve's extremely sensitive parts and distorting the valve, the valve block would be mounted to the machine' frame with a 3-point pattern.
The location of the spool may be actuated by hydraulic pilot pressure, mechanical levers, or solenoids which push the spool left or right. A seal enables a portion of the spool to stick out 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 capacity and flow performance. Several valves are designed to be on-off, while others are designed to be proportional, as in flow rate proportional to valve position. The control valve is one of the most expensive and sensitive components of a hydraulic circuit.
Counterbalance forklifts are popular pieces of equipment in the material handling trade. They are really common machinery used in warehouses and factories all-around the world. The leading lift truck manufacturers like for example Mitsubishi, Linde and Toyota all create counterbalance forklifts. They are existing in different fuel choices like for instance electric, gas or diesel. Typically, a counterbalanced forklift truck contains the following parts:
The Cab is the area that has a seat 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 machinery that each of the various parts, mast and counterweight, the axles, wheels, power source are all attached to. The frame might also 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.
Constructed of heavy iron the counterweight is attached to the back of the forklift frame. The purpose of the counterweight is to balance all the load being lifted and transferred. Utilizing an electric lift truck, the big lead-acid battery itself could operate as part of or all of the counterbalance. The Power Source could have an internal combustion engine which can be powered by gasoline, LP gas, CNG gas or diesel. Electric lift trucks are driven by either fuel cells which provide power to a battery or electric motors. The electric motors can be either DC or AC types.
Fork attachments are different kinds of material handling attachments that are accessible including carpet poles, pole handlers, side shifters, multipurpose clams, carton clamps, slip-sheet attachments, fork positioners, roll clamps and container handlers.
The counterbalanced forklift is the best electric lift truck to use for parking pallets closely together. Counterbalanced lift trucks provide a few advantages over straddle-leg styles and fork-over designs. They do have some drawbacks however. A counterbalanced forklift can lift pallets straight off the ground because 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 would normally be less than the various styles.
