Views: 269 Author: Site Editor Publish Time: 2021-08-07 Origin: Site
In daily life, we often see stainless steel hydraulic ball valves and 3-way hydraulic ball valves. There are many types of valves, so we have to choose the appropriate valve according to different situations. Today, we will talk about the following three valve options.
The Scope of Application of the Selected Valve Should Be Consistent with the Conditions of the Site
According to the air source pressure, power supply conditions, medium temperature, humidity, ambient temperature and humidity, dust, and vibration, we should choose a valve that is suitable for use under this condition. We can use a diaphragm pressure gauge or a compound pressure gauge to measure pressure.
The Function and Control Method of the Selected Valve Should Meet the Requirements of the System
According to the requirements of the pneumatic system on the number of positions of the components, the number of passages, the memory, the on-off state and the control mode when standing still, we should select valves that meet the required functions and control methods.
The Flow Capacity of the Selected Valve Should Meet the Requirements of the System
We need to calculate the diameter of the valve according to the requirements of the pneumatic system for the maximum instantaneous flow of the component and the average air flow velocity of 15-25 m/s, and then find out the flow capacity C value (or KV), CV value, and rated flow rate of the required valve. Pressure drop, standard rated flow and S value. Based on this, we select a valve that meets the requirements of system flow capacity. While calculating the flow rate, we can also consider the accessories used in related systems, such as hydraulic hose quick release couplings and stainless steel hydraulic hose fittings.
The Performance of the Selected Valve Should Meet the Working Requirements of the System
According to the lowest operating pressure or lowest control pressure of the pneumatic system, dynamic performance, highest operating frequency, continuous energization ability, power consumption, life and reliability of the valve, we need to select a valve that meets the required performance indicators.
The Installation Method of the Selected Valve Should Be Considered Based on the Requirement
At present, the widely used directional valve in my country is the plate installation method. Its advantage is that it is easy to assemble, disassemble and maintain. The ISO standard also adopts the plate installation method and develops the manifold plate installation method. Therefore, it is recommended to prefer the panel installation method. However, due to the continuous improvement of the quality and reliability of the components, the pipe-mounted valve occupies a small space and can also be installed in a container, so it has also been used. Therefore, the selection should be determined according to the actual situation. When installing, we also need to consider related accessories. We recommend using stainless steel hydraulic adapters and stainless steel hydraulic hose crimp fittings, which are cheap and have a long service life.
Try to Use Standardized Products
Because standardized products use mass production methods, the finished products have a stable and reliable quality, a high degree of generalization and a cheap price. Therefore, we choose standardized products as much as possible.
The Price of the Selected Valve Should be Compatible with the System Level and Reliability Requirements
We should consider the price of the valve according to the advanced level and reliability requirements of the pneumatic system. On the premise of ensuring that the system is advanced, reliable and easy to use, we must strive for reasonable prices and quality.
Generally, we need to select the pressure reducing valve according to the highest working pressure of the pneumatic control system. The air source pressure should be 0.1Mpa greater than the maximum working pressure of the pressure reducing valve. When the outlet pressure fluctuation of the pressure reducing valve is required to be small, if the outlet pressure fluctuation is not more than ±0.5% of the maximum working pressure, a precision pressure reducing valve is used. When remote control is required or the diameter is greater than 20 mm, an external pilot-operated pressure reducing valve should be used as much as possible.
Usually, we select the diameter of the overflow valve according to the required overflow. For the relief valve, it is hoped that the valve will exhaust immediately as soon as the pneumatic circuit exceeds the set pressure. Once the pressure is slightly lower than the set pressure, the valve can be closed immediately. In this process from valve opening to closing, the smaller the pressure change in the pneumatic circuit, the better the overflow characteristics. Under normal circumstances, an overflow valve whose set pressure is close to the highest operating pressure should be selected. If the pipe diameter is large (such as 15 mm or more) and operated at a long distance, a pilot-operated relief valve should be used.
If you want to learn more about valves, please continue to pay attention to our website. In addition, we also provide high-quality steel pipe fittings and brass compression fittings.
