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The control valve is a device which directs the fluid to the actuator. This tool would consist of steel or cast iron spool which is situated in a housing. The spool slides to different positions inside the housing. Intersecting channels and grooves route the fluid based on the spool's position.
The spool is centrally located, help in place with springs. In this particular location, the supply fluid can be blocked and returned to the tank. When the spool is slid to a direction, the hydraulic fluid is directed to an actuator and provides a return path from the actuator to tank. When the spool is transferred to the other side, the return and supply paths are switched. As soon as the spool is enabled to return to the neutral or center place, the actuator fluid paths become blocked, locking it into place.
Normally, directional control valves are built so as to be stackable. They generally have a valve for each hydraulic cylinder and a fluid input that supplies all the valves in the stack.
In order to avoid leaking and handle the high pressure, tolerances are maintained really 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 would be mounted to the machine' frame with a 3-point pattern.
The position of the spool may be actuated by hydraulic pilot pressure, mechanical levers, or solenoids which push the spool right or left. A seal enables a part of the spool to protrude outside 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 flow performance and capacity. Various 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 costly and sensitive parts of a hydraulic circuit.
Counterbalance lift trucks are really popular pieces of equipment in the material handling business. They are actually popular machines used in warehouses and factories all over the world. The leading lift truck producers like Linde, Toyota and Mitsubishi all create counterbalance lift trucks. They are offered in a variety of fuel alternatives such as electric, gas or diesel. Typically, a counterbalanced forklift truck comprise the following components:
The Cab is the part that has a seat designed for the person operating it and houses the a dashboard containing operator readouts, control pedals, levers, steering wheel plus various switches. The Truck Frame is the foundation of the machine that each of the various 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 raising and lowering the forklift's load.
Made of heavy iron the counterweight is connected to the back of the forklift frame. The purpose of the counterweight is to counterbalance the weight being carried and transported. With an electric forklift, the huge lead-acid battery itself could function as part of or all of the counterweight. The Power Supply can have an internal combustion engine which can be powered by diesel, gasoline, LP gas or CNG 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 DC or AC kinds.
Fork accessories are numerous kinds of material handling attachments which are available including 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 forklift is the ideal electric lift intended for the task. There are numerous advantages to using a counterbalance lift rather than fork-over and straddle-leg designs. They do have several disadvantages though. A counterbalanced lift truck can lift pallets directly off the floor for the reason that there are no stabilization legs to get in the way. The main disadvantage of this particular model of forklift is that the lift height and the weight capacity would generally be less than the various styles.
