For Any Hydraulic System, The Correct Choice Of Hydraulic Valve
The correct choice of hydraulic valve
For any hydraulic system, the correct choice of hydraulic valve, will make the hydraulic system design is reasonable, excellent performance, easy installation, easy maintenance, while ensuring the normal operation of the system an important condition. Here from several aspects to explain how to choose a reasonable hydraulic valve.
1. The general principle of choice
First, according to the functional requirements of the system to determine the type of hydraulic valve. Should try to choose the standard series of generic products. Depending on the actual installation, choose a different connection, such as tube or plate connection. Then, according to the system design of the maximum working pressure to select the hydraulic valve rated pressure, according to the maximum flow through the hydraulic valve to select the hydraulic valve flow specifications. If the relief valve should be selected according to the maximum flow rate of the hydraulic pump, the flow valve should be selected according to the flow rate controlled by the loop. The minimum steady flow should be less than the minimum steady flow required by the speed range.
2. Selection of hydraulic valve installation method
The installation of the hydraulic valve on the structure of the hydraulic device has a decisive impact, so according to the specific circumstances to choose the appropriate installation. In general, when choosing a hydraulic valve installation method, it should be based on the size of the selected hydraulic valve, the complexity of the system and the layout characteristics. Several of the installation methods described above have their own characteristics. Threaded connection, suitable for the system is relatively simple, fewer components, the installation location is more spacious occasions. Plate connection type, suitable for the system is more complex, more components, the installation location is more compact occasions. The connection plate can be drilled to communicate the oil path and install a plurality of hydraulic components on the connection plate to reduce the connection between the hydraulic valves and reduce the leakage points, making installation and maintenance easier. Flange connection type is generally used for large diameter valves.
3. Selection of Rated Pressure of Hydraulic Valve
The rated pressure of the hydraulic valve is the basic performance parameters of the hydraulic valve, marking the hydraulic valve pressure capacity of the size, refers to the hydraulic valve in the rated working state of the nominal pressure. Hydraulic valve rated pressure selection, should be based on the hydraulic system design work pressure to select the corresponding pressure level of the hydraulic valve. In general, the rated pressure value indicated on the hydraulic valve should be made to be greater than the operating pressure of the system.
4. Selection of Hydraulic Valve Flow
The nominal flow rate of the hydraulic valve is the nominal flow rate of the hydraulic valve passing through the rated operating conditions. The actual working flow of the hydraulic valve is related to the connection way of the oil in the system: the flow rate of the series circuit is equal and the flow of the parallel circuit is equal to the sum of the oil flow. When choosing the flow rate of the hydraulic valve, it is obviously the most economical if the rated flow of the valve is close to the working flow of the system. If the rated flow rate of the selector valve is smaller than the working flow, it is likely to cause hydraulic chucking and hydrodynamic force and may adversely affect the working quality of the valve. In addition, it is not possible to simply select the flow rate of the valve based on the rated output flow rate of the hydraulic pump, since the flow rate of each circuit passing through each hydraulic system is unlikely to be the same. Therefore, in the selection, should consider the hydraulic valve where the loop may pass the maximum flow.
For example, if a differential hydraulic cylinder is used in a circuit, the flow rate of the rodless cavity is much larger than that of the rod chamber, and may even exceed the maximum flow rate of the hydraulic pump output. Valve, it should be considered to reach a point, so that a reasonable match. And if some of the flow through the relatively large circuit, if the flow of the equivalent of the choice of the valve, the commutation operation may have a greater hydraulic shock. In order to improve the work performance, you can use large one size specifications of the valve.
5. Selection of Hydraulic Valve Control Mode
There are many ways to control the hydraulic valve, generally based on the system's operational needs and electrical system configuration capabilities to choose. For hydraulic systems with low or small levels of automation, manual control is available.
6. Economic choice
Select the hydraulic valve, should meet the requirements of the work under the premise, as far as possible the use of cost and lower cost of the hydraulic valve to improve the host's economic indicators. For example, for systems where speed stability is not critical, the throttle valve should be selected instead of the speed control valve. In addition, the choice of hydraulic valve, do not blindly choose the price cheaper valve, to consider the reliability of its work and working life, that is, consider the comprehensive cost. But also to consider the maintenance of the convenience and speed, so as not to affect the production.