Load sensing pressure compensation multi - way valve application

one. Summary Multi-way directional control valve is the central control element of traveling mechanical hydraulic system. Is the system actuator pressure flow control and load pressure control of the central control element. With the new situation of China's accession to the WTO, the need of market competition and technological progress, people's demands for humanized operation performance of traveling machinery are enhanced. The traditional multi-way valve of processing channel not only wastes humanity's natural resources and processing Costs, and technical functions can not meet the people's requirements for modern operating concepts. Reducing the manufacturing cost of components Increasing the technical functions of components and saving the natural resources upon which human beings depend for survival are extremely important investment and social values in today's energy shortage. two. Industry status China's hydraulic mechanical multi-way switching valve development history is relatively short, most of the current varieties are designed and developed by the host plant dedicated components to the crane industry control valve on the train, for example, from the birth of the first host until now Has kept the processing channel multi-way valve. Not only waste a lot of raw materials and labor resources, and can not be standardized; serialization. The inventor developed a pressure adaptive multi-way valve on the basis of the Japanese inner-field valve in 1994. Patent No. [ZL93219418.4]. The basic solution to the technical status of 16T-25T crane. However, the 8-12T still uses its traditional products due to its complex structure and high manufacturing costs, which can only be used on large cranes. A few large-tonnage cranes supporting components can only be imported to solve. Load sensing pressure compensation multi-way valve technology development included in our science and technology projects. three. Technical introduction Load sensing Pressure compensation Multi-way valve invented is the product of modern hydraulic technology development. The invention is a stackable modern multi-channel control element with load sensing pressure compensation. By comparing the sensing slippery (compensating slippery) pressure difference between the upper and lower cavity ΔP keep constant principle, stepless adjustment of work flow. In changing load conditions, choose any point of travel, have achieved a constant flow control, and with pressure compensation. In the simultaneous operation of multiple valves with different loads, to achieve different traffic and different load pressures independent of each other's synchronization work. Reduce unnecessary power loss, to achieve full-power hydraulic system soft and smooth control. A unique pressure compensation and low pressure relief mechanism to ensure the components of the pressure compensation and low pressure relief function, while reducing the pressure loss to achieve the purpose of saving energy. Varieties have been developed to meet the traveling machinery at 25Mpa pressure 40-300L / min flow range of modern multi-way valve design needs. This element can be used for dosing pumps (open loop systems) or variable displacement pumps (closed loop systems). All seals adopt German "zero leakage" seal structure and seals. Control methods are manual, hydraulic control, manual pneumatic dual control, manual hydraulic double control. Can be any combination within 10 combined. Therefore, to meet the various types of walking hydraulic machinery into the advanced hydraulic components of the design requirements. 1.5SP08GQ load sensing multi-way valve (16T ~ 25T truck crane) Take 16-25T crane as an example. The 5SP08GQ load sensing multi-way valve is an integrated design oil line consisting of DP08 and D08 valves. And to ensure that the lifting of the load-sensing control conditions and to ensure the luffing; slewing; telescopic conditions of reliability. At the same time to achieve a dual pump and three pump a valve system. And the rotating film has a two-way buffer function, to ensure a stable work slewing mechanism. The overall use of tandem oil, to ensure safe and reliable operation. 2.4SDP08GQ load sensing multi-way valve (8T ~ 16T truck crane) 4SDP08GQ load sensing multi-way valve is a patented product developed for 8-16T truck crane. Maintains load sensing and dual pump confluence. At the same time with the rotary buffer function. And all valves are all common. You can also use 4SDP0804GQ double through the complex program to reduce the size of the valve and reduce its manufacturing costs. 3. DP08G-type multi-valve can demonstrate DP08G-type multi-way slide valve function is complete, to meet the design requirements of the system of mobile machinery. Practical hydraulic excavators; loaders; Pipelayer hydraulic open-loop and closed-loop systemControl Valve, Flow Control Valve, Hydraulic Control Valve, Proportional Directional Control Valve.