Guided servo direction control valve

Abstract

A control valve of driving direction for guide servo consists of left end cover and right end cover, balance spring for control valve core, balance spring for main valve, main valve body, main valve core and control valve core. The left and right end covers will be fixed on the main valve body to form left and right control cavities together with the main valve body and there will be ring slot of oil channel, circular hole and oil channel connecting through to external in the main valve body. The control valve core will be set in the hole of main valve core as its two sleeves for raising shoulders to be corresponded to two circular ring slots on the main valve i.e symmetrical centre line for width of the circular ring slot to be coincided with symmetrical centre line for width of the sleeve for raising shoulder.

Description

(1) Technical field [0001] The present invention relates to a valve, in particular a pilot servo driven directional control valve. (2) Background technology [0002] At present, for high pressure and large flow (above 32 diameter) directional control valves, some large hydraulic parts production companies such as German Rexroth (REXROTH), American Parker (PARKER), Japan Yuken (YUKEN) and some domestic hydraulic pressure Parts production company (see 1. "Construction Machinery Hydraulic Products", American Parker Company Sample HY02-8029 / C, January 2002; 2. "Walking Machinery Hydraulic Components", German REXROTH Company Hydraulic Product Manual, Volume XI; 3 , "Yuken Hydraulic Products", Japanese YUKEN Company's 1995 Chinese version engineering information catalog; 4, "Multi-way reversing valve and other valves" sample, Changjiang Hydraulic Parts Factory) in order to overcome the large operating force and realize proportional control and remote control and other difficultie...

AI Technical Summary

Problems solved by technology

[0003] The position of the main spool of the above-mentioned high pressure and large flow directional control valve is determined by the pressure difference of the control oil and the balance force of the balance spring, so the fluctuation of the control oil pressure, the accuracy of the spring stiffness change and the hydraulic force will all affect the positioning accuracy of the main spool and stability

Secondly, because there is a certain distance between the control port of the proportional pressure reducing valve and the oil passage connecting the control port of the left and right end covers of the main valve, the response speed of the main valve is relatively low.

In addition, since the main valve and the proportional pressure reducing valve are two separate components, the structure of the system is complicated, there are many leakage points, and the manufacturing cost is high.

At the same time, since the oil inlet port of the proportional pressure reducing valve is a normal pressure port, the additional energy consumption is relatively large

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