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Forklift multi-way valve
Date: 2018-03-17 View:
Forklift multi-way valve
Forklift multi-way valve, also called multi-way reversing valve. The main function is to control the lifting and lowering, tilt, side shift and distance adjustment of the forklift. This is the main hydraulic component of the forklift.
Generally, the multi-way valve is installed on the right side of the front beam of the forklift. Almost under the front floor of the forklift driver's right foot. You can find the multi-way valve by going down the handle bar of the forklift. As shown in the figure:
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The left side of the picture points to the first and second couplets, which are where the handle rods and pull rods are connected. The movement of the valve core is driven by the pull or push force of the handle rod. The movement of the spool determines the flow direction of the corresponding port oil.
Generally, the first joint is for lifting, the second joint is for tilt, the third joint is for side shift, and the fourth joint is for distance adjustment. In the vast majority of cases, up to five pairs are assigned. The oil port P is the oil inlet port, and the T is the oil return port. The first joint generally has only one oil pipe, because the lifting cylinder is a plunger cylinder (only one oil cavity).
The lowering of the hoisting cylinder relies on its own gravity to return oil, so a pipe produces oil when it lifts and returns oil when it falls. The other couples are two pipes divided into AB oil ports, when one is out of oil, the other returns oil.
The protruding part above and below the multi-way valve is the safety valve, and the safety valve pressure of the entire multi-way valve is close to the P port, which is equivalent to the system pressure of the entire forklift. The general pressure of the safety valve is 18.5-21Mpa, and all forklifts are adjusted at the factory. Later, if the pressure is not correct, you can manually adjust the pressure. Loosen the nut pointed by the red arrow, this is the lock nut, and the screw inside is a hexagon socket. Turn it clockwise to increase it, and turn it counterclockwise to decrease it. The last is to measure the system pressure through the pressure gauge. After adjusting in place, tighten the lock nut. Then each unit has a corresponding overload valve.
When purchasing a forklift, the standard configuration is a two-way multi-way valve, and additional functions will cost extra, similar to the optional accessories installed when buying a car. In most cases, the three or four joints are equipped with accessories, and some customers directly use the original factory if they do not have the ability to assemble them themselves. Some customers can add a five-way valve and plug the oil ports with plugs in order to have the extended function of the forklift in the future. When adding attachments in the future, just connect the pipe and handle rod, and there is no need to replace the entire multi-way. valve. Because of the heavy workload of replacing the multi-way valve, a lot of things have to be dismantled, and then the original one is wasted.