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The control valve is a device that directs the fluid to the actuator. This device would include steel or cast iron spool that is located within a housing. The spool slides to different positions in the housing. Intersecting grooves and channels route the fluid based on the spool's position.
The spool has a central or neutral position that is maintained by springs. In this location, the supply fluid is returned to the tank or blocked. 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. When the spool is moved to the opposite side, the supply and return paths are switched. Once the spool is enabled to return to the center or neutral place, the actuator fluid paths become blocked, locking it into position.
The directional control is typically designed to be stackable. They normally have a valve for each hydraulic cylinder and a fluid input that supplies all the valves within the stack.
To be able to prevent leaking and deal with the high pressure, tolerances are maintained very 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 will be mounted to the machine' frame by a 3-point pattern.
The location of the spool could be actuated by hydraulic pilot pressure, mechanical levers, or solenoids which push the spool right or left. A seal allows 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 flow performance and capacity. 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 one of the most expensive and sensitive components of a hydraulic circuit.
Counterbalance lift trucks are actually common pieces of equipment in the material handling industry. They are common machines found in warehouses and factories around the globe. The leading forklift producers like for instance Linde, Toyota and Mitsubishi all build counterbalance forklifts. They are offered in various fuel choices such as diesel, electric or gas. Usually, a counterbalanced forklift truck consists of the following components:
The Cab is the section which has a seat meant for the operator and houses the steering wheel, a dashboard containing operator readouts, control pedals, levers and various switches. The Truck Frame is the foundation of the machinery that each of the other parts, power source, mast and counterweight, the axles, wheels are all attached to. The frame can also 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.
Constructed of heavy iron the counterweight is connected to the rear of the forklift frame. The objective of the counterweight is to offset all the cargo being lifted and transported. Utilizing an electric forklift, the big lead-acid battery itself can serve as part of or all of the counterweight. The Power Supply can have an internal combustion engine that can be powered by LP gas, CNG gas, diesel or gasoline. Electric lift trucks are driven by either fuel cells which provide power to a battery or electric motors. The electric motors can be either AC or DC kinds.
Accessories designed for the forks vary in the kind of application they allow the forklift to do. Attachments include: container handlers, carpet poles, pole handlers, side shifters, multipurpose clams, carton clamps, slip-sheet attachments, fork positioners and roll clamps. A lot of manufacturing businesses will specially modify an attachment so as to meet a customer requirement.
When needing to park pallets closely together, the counterbalance lift truck is the best electric lift meant for the job. There are many advantages to using a counterbalance lift rather than straddle-leg and fork-over designs. They do have a few drawbacks however. A counterbalanced forklift can lift pallets straight off the ground for the reason that there are no stabilization legs to interfere. The main drawback of this model of forklift is that the lift height and the weight capacity would normally be less than the other styles.
