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The control valve is actually a tool which directs the fluid to the actuator. This tool would include cast iron or steel spool that is positioned inside of housing. The spool slides to different positions inside the housing. Intersecting channels and grooves route the fluid based on the spool's location.
The spool is centrally located, help in place with springs. In this particular position, the supply fluid can be blocked and returned to the tank. If the spool is slid to one side, 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 opposite direction, the supply and return paths are switched. When the spool is allowed to return to the neutral or center place, the actuator fluid paths become blocked, locking it into position.
The directional control is usually designed to be stackable. They usually have one valve per hydraulic cylinder and one fluid input that supplies all the valves in the stack.
So as to prevent leaking and handle 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. 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.
Mechanical levers, solenoids or a hydraulic pilot pressure may actuate or 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 controls the stack of directional control valves by capacity and flow performance. Several of these valves are designed to be proportional, like a proportional flow rate to the valve position, whereas other valves are designed to be on-off. The control valve is amongst the most costly and sensitive parts of a hydraulic circuit.
In the material handling trade counterbalance forklifts are extremely popular pieces of equipment. They can be usually used in factories and warehouses all around the world. The leading lift truck producers such as Linde, Toyota and Mitsubishi all create counterbalance lift trucks. They are available in a variety of fuel options like gas, diesel or electric. Normally, a counterbalanced forklift truck contains the following parts:
The part meant for the operator known as the "cab" and houses all of the a dashboard which contains certain readouts, levers, pedals, steering wheel and different switches. The frame of the lift truck is the foundation designed for the different components of the equipment consisting of the power supply, the wheels, the axles, mast and the counterweight. 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 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 offset the weight being carried and transported. With an electric lift truck, the big lead-acid battery itself can function as part of or all of the counterweight. The Power Supply could have an internal combustion engine that can be powered by diesel, gasoline, LP gas or CNG gas. Electric lift trucks are powered by either fuel cells which provide power to electric motors or a battery. The electric motors could be either DC or AC kinds.
Accessories meant for the forks differ in the type of application they allow the forklift to carry out. Attachments comprise: slip-sheet attachments, fork positioners, roll clamps, container handlers, carpet poles, pole handlers, side shifters, multipurpose clams and carton clamps. Numerous manufacturing businesses will specially customize an attachment so as to meet a client requirement.
When needing to park pallets closely together, the counterbalance lift truck is the best electric lift intended for the job. There are many advantages to utilizing a counterbalance lift over straddle-leg and fork-over designs. They do have some drawbacks however. A counterbalanced lift truck could lift pallets straight off the ground because there are no stabilization legs to interfere. The main disadvantage of this particular model of forklift is that the lift height and the weight capacity will usually be less compared to the different styles.
