Selection of directional valve

1. The scope of application of the selected valve shall be consistent with the conditions on the site.

That is to say, the valve suitable for reliable use under such conditions shall be selected according to the air source pressure, power supply conditions (AC and DC, voltage size and fluctuation range), medium temperature, humidity, ambient temperature and humidity, dust, vibration, etc.

2. The function and control mode of the selected valve shall meet the working requirements of the system

That is to say, according to the requirements of the pneumatic system for the position number, path number, memory, on-off state and control mode of the components during the static setting, valves meeting the required functions and control modes shall be selected.

3. The flow capacity of the selected valve shall meet the working requirements of the system

That is to say, according to the requirements of the pneumatic system for the instantaneous maximum flow of components, the valve diameter shall be calculated according to the average air flow speed of 15-25m / s, and the flow capacity C value (or kV), CV value, pressure drop under the rated flow, standard rated flow and s value of the required valve shall be found out, and the valve meeting the requirements of the system flow capacity shall be selected accordingly.

4. The performance of the selected valve shall meet the working requirements of the system

That is, according to the minimum working pressure or minimum control pressure and dynamic performance of the pneumatic system

The valve meeting the required performance index shall be selected according to the requirements of energy, maximum working frequency, continuous power on capacity, power consumption, service life and reliability of the valve.

5. The installation mode of the selected valve shall be considered comprehensively according to the quality level of the valve, the requirements of the space occupied by the system and the convenience of maintenance

At present, the widely used reversing valve in our country is plate type installation, which has the advantages of easy installation, disassembly and maintenance. ISO standard also adopts plate type installation and develops plate type installation. Therefore, plate installation is preferred. However, due to the continuous improvement of the quality and reliability of the components, the valve of the tubular installation mode occupies a small space and can also be assembled, so it has also been applied. Therefore, the selection should be determined according to the actual situation.

6. Try to choose standardized products

Because the standardized products adopt the mass production method, the quality is stable and reliable, the degree of generalization is high, and the price is cheap.

7. The price of the selected valve shall meet the system level and reliability requirements

That is to say, the price of the valve shall be considered according to the degree and reliability requirements of the pneumatic system. Under the premise of ensuring the system, reliability and convenient use, strive to make the price reasonable, and do not ignore the quality and pursue low cost.

8. In the design of large-scale control system, bus control mode of integrated valve and signal shall be considered as much as possible

Selection of directional control valve

1. Selection of directional control valve series

The valve of different function series should be selected according to different actuator

2. Specification selection of directional control valve

The flow capacity of the selection valve shall meet the system working requirements, that is, the valve diameter shall be calculated according to the requirements of the pneumatic system for the instantaneous maximum flow of components.

3. Selection of control mode

Proper control mode of reversing valve shall be selected according to working requirements and action mode of cylinder.

4. Selection of applied voltage