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The control valve is actually a tool which routes the fluid to the actuator. This device would consist of steel or cast iron spool which is located inside of housing. The spool slides to various locations in the housing. Intersecting grooves and channels direct the fluid based on the spool's location.
The spool has a neutral or central location which is maintained with springs. In this location, the supply fluid is blocked or 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. If the spool is transferred to the other side, the return and supply paths are switched. When the spool is allowed to return to the center or neutral place, the actuator fluid paths become blocked, locking it into place.
Usually, directional control valves are designed so as to be stackable. They generally have a valve per hydraulic cylinder and one fluid input which supplies all the valves inside the stack.
Tolerances are maintained very tightly, so as to tackle the higher pressures and to avoid leaking. The spools will often have a clearance within the housing no less than 25 µm or a thousandth of an inch. To be able to avoid distorting the valve block and jamming the valve's extremely sensitive components, the valve block will be mounted to the machine' frame by a 3-point pattern.
A hydraulic pilot pressure, mechanical levers, or solenoids might actuate or push the spool right or left. A seal allows a part of the spool to stick out 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. Some of these valves are designed to be proportional, like a proportional flow rate to the valve position, while some valves are designed to be on-off. The control valve is one of the most pricey and sensitive parts of a hydraulic circuit.
Counterbalance forklifts are actually common pieces of equipment in the material handling industry. They are actually popular equipment utilized in warehouses and factories all-around the globe. The leading lift truck makers such as Mitsubishi, Linde and Toyota all create counterbalance lift trucks. They are accessible in a variety of fuel options like electric, gas or diesel. Typically, a counterbalanced forklift truck comprise the following parts:
The Cab is the area which has a seat designed for the operator and houses the a dashboard containing operator readouts, control pedals, levers, steering wheel plus various switches. The Truck Frame is the base of the machine that each of the various parts, mast and counterweight, the axles, wheels, power source are all attached to. The frame can even have fuel tanks and hydraulic fuel tanks made as part of its assembly. The Mast is the vertical assembly that does most of the work raising and lowering the forklift's load.
Made of heavy iron the counterweight is attached to the back of the forklift frame. The objective of the counterweight is to counterbalance all the cargo being lifted and transferred. Using an electric forklift, the large lead-acid battery itself can serve as part of or all of the counterbalance. The Power Supply could have an internal combustion engine which could be powered by diesel, gasoline, LP gas or CNG gas. Electric forklifts are powered by either fuel cells that provide power to electric motors or a battery. The electric motors may be either AC or DC types.
Accessories intended for the forks differ in the kind of application they allow the forklift to do. Attachments include: multipurpose clams, carton clamps, slip-sheet attachments, fork positioners, roll clamps, container handlers, carpet poles, pole handlers and side shifters. Lots of manufacturing companies will specially customize an attachment to be able to satisfy a customer need.
The counterbalanced forklift is the ideal electric forklift to utilize for parking pallets closely together. Counterbalanced lift trucks offer some advantages over straddle-leg styles and fork-over designs. They do have a few disadvantages however. A counterbalanced lift truck could lift pallets straight off the floor because there are no stabilization legs to get in the way. The main drawback of this particular model of forklift is that the lift height and the weight capacity would normally be less compared to the other kinds.
