Tips for innovative design of pilot valve in the h

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Tips for innovative design of pilot valve in directional control valve

I. overview of pilot valve:

directional valve is the most commonly used valve in hydraulic system. Its performance will directly affect the performance of the whole hydraulic system, and thus affect the operation quality of the system. The working reliability of the large flow reversing valve mainly depends on the reversing reliability of its pilot valve [2]. Most of the pilot valves of the current directional valves are cone valves or needle valves, and the final closing 378 rises by 0.27%. These valves often cause system failure due to working medium pollution. One of the important reasons is the congenital deficiency in the structure of the pilot valve

II. Structure and working principle

the pilot valve is composed of wet valve electromagnet, valve core, transmission plunger, valve sleeve, thimble rod, steel ball, steel ball seat, return spring, etc. The valve core and valve body are connected by thread. One end of the transmission plunger is connected with the electromagnet armature, and the other end is against the steel ball. Therefore, both the thrust of the upper electromagnet and the force of the lower spring make the two steel balls linked with the ejector rod. The results show that the scaffold has a supporting cell adsorption chamber and is respectively connected with the radial holes on the valve core. This is a two position three-way double ball normally closed solenoid valve. When the electromagnet is powered off, the pressure oil entering from the P chamber acts directly on the ball seat of the pilot valve, and the elastic force of the return spring acts on the ball seat in the same direction, so that the lower valve port of the pilot valve is closed and the upper valve port is opened, thus blocking the pressure oil circuit and the control oil circuit a, and opening the control oil circuit and the return oil circuit t. In this case, the control oil circuit is unloaded; When the electromagnet is powered on, the transmission plunger pushes the upper steel ball downward, the upper valve port is closed and the lower valve port is open. Therefore, the passage of control oil circuit and return oil circuit whose inspection result is 94 is blocked, and the pressure oil circuit and control oil circuit are opened at the same time. The pressure oil enters the oblique hole of the valve body through the control chamber of the pilot valve to keep the control oil circuit in working state

III. tips for innovative design of pilot valve:

carry out innovative design from its structure. The outstanding feature is that the double ball valve structure is adopted and inserted on the main valve body, so that the reversing reliability, sensitivity, anti pollution ability, service life and other performance indicators are greatly improved, and the failure rate of the system is greatly reduced. After years of use, the users generally gave good feedback

1. Firstly, the traditional pilot valve is an independent component, which is usually connected with the main valve in some way. The innovation of this design is that the pilot valve is presented in the form of valve core. It shares a valve body with the main valve in a plug-in manner. This not only saves a valve body and greatly simplifies the overall structure, but also can be flexibly inserted into various types of directional valves as a pilot valve. Especially, it is more convenient to be used in the electromagnetic multi-channel combined valve. It is similar to a common part in this local scope

2. Secondly, most of the pilot valves in the current directional valves at home and abroad are needle valve or cone valve structures. For example, the two pilot valves of mc34x directional valve produced by sauersundstrand company in the United States are normally closed two position two-way needle valves. MC series products are sold all over the world with its advanced technology and have a broad market in China. However, because the pilot valve is a needle valve, its seat hole diameter is very small, and the damping hole diameter of the main valve is also small, which can work normally only when the working medium is very clean. Otherwise, it is easy to jam. The valve adopts double ball valve structure, which not only has good sealing performance, less leakage, but also has no hydraulic clamping problem. Even if there are large particles of pollutants in the oil duct, there will be no blockage, and the normal operation of the hydraulic system can be guaranteed. This is its outstanding feature. Leakage inspection shall be carried out for flanges and pipe joints

3. Various types of directional control valve series developed by the company adopt advanced pilot valve with independent intellectual property rights, which makes its reversing work reliable, sensitive operation and long service life. In particular, the ball valve structure makes them highly resistant to pollution. In addition, it has simple structure, convenient use and maintenance, and natural advantages in price. Therefore, it is an ideal hydraulic part for the directional control valve in the hydraulic system to replace the imported products

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