How to choose pneumatic components "pneumatic hoses, cylinders, pneumatic pipe joints, pneumatic reversing valves"

How to purchase pneumatic hoses: When purchasing pneumatic hoses, you should pay attention to the following four aspects: 1. Pipe material: PU pipe, nylon hose, etc. 2. The inner and outer diameter dimensions of the pipe: customary The outer diameter of the pipe is used as the size of the pipe, commonly known as the "diameter". It is not the same thing as the commonly known nominal diameter. Users should pay special attention when purchasing. 3. Uniformity of pipe wall thickness. Uneven pipes are prone to air leakage during operation. 4. For the wall thickness of the pipe, the type of pipe joint used should be considered when selecting the hose. When using clamp-type pipe joints and sleeve-type pipe joints, attention should be paid to the inner diameter of the pipe;when using plug-in pipe joints, attention should be paid to the outer diameter of the pipe. diameter size. How to choose a cylinder Cylinder is an actuator in a pneumatic system. The quality of the cylinder will directly affect the working performance of the supporting equipment. Therefore, we should pay attention to the following aspects when selecting a cylinder: 1. Choose a manufacturer with high reputation, quality and A manufacturer with a good service reputation. 2. Check the standards used by the company to produce cylinders. If it is a company standard, it should be compared with the industry standard. 3. Inspect the appearance, internal and external leakage and no-load performance of the cylinder: a. Appearance: The surface of the cylinder barrel and piston rod should have no scratches, and there should be no pores and trachoma on the end cover. b. Internal and external leakage: The cylinder is not allowed to have external leakage except the rod end. The internal leakage and the external leakage at the rod end should be less than (3+0.15D) ml/min and (3+0.15d)ml/min respectively. c. No-load performance: When the cylinder is in a no-load state and runs at low speed, see what the speed is without crawling. The lower the speed, the better. 4. Pay attention to the installation form and size of the cylinder. The installation size can be mentioned when ordering from the manufacturer. The cylinder is generally not in stock. Try to use the standard type, which can shorten the delivery time. How to choose pneumatic pipe joints 1. The types of pipe joints: a. Clamp-type pipe joints, mainly suitable for cotton braided hoses;b. Clamp-type pipe joints, mainly suitable for non-ferrous metal pipes and rigid nylon pipes;c. , Plug-in pipe joints, mainly suitable for nylon pipes and plastic pipes. 2. Pipe joint forms: bent angle, right angle, through plate, tee, four-way, etc. Users can choose according to their needs. 3. There are three methods for naming the interface of pipe joints: a. According to the nominal diameter of the connected pipeline, commonly known as "diameter", you should pay attention to it when purchasing clamp-type pipe joints and ferrule-type pipe joints. The inner diameter of the pipe;when selecting a plug-in pipe joint, attention should be paid to the outer diameter of the pipe. Commonly used in branch joints such as tees and crosses. b. According to the nominal interface thread of the pipe joint, this type of joint is not commonly used. c. Based on the nominal diameter of the pipeline and the nominal thread combination of the joint, this type of joint is often used for the inlet and outlet of pneumatic components. How to choose a pneumatic reversing valve Pneumatic reversing valve is a control component in a pneumatic system, used to control the flow direction of fluid in the system. There are many types of pneumatic reversing valves, and users can choose according to their own needs. The common types of directional valves are as follows: divided according to the air outlet: two-way, three-way, four-way and five-way;divided according to the working position: two-position and three-position. According to the control mode: pneumatic control and electric control, direct-acting and pilot-operated;according to the controlled medium: fluid valve and gas valve;according to the function: normally closed and normally open, middle sealing and middle leakage and intermediate gas supply;According to structure: there are stop valves and slide valves;when purchasing pneumatic reversing valves, you should pay attention to the following points: 1. Threaded interface of the reversing valve: the nominal diameter of the reversing valve does not correspond to the air port thread one by one. , therefore, attention should be paid to the interface thread when selecting a reversing valve. 2. Installation dimensions of the reversing valve: reversing valves of the same model and function have different shapes and installation dimensions due to different manufacturers. 3. Whether the reversing action is crisp and smooth, without any sloppiness. 4. Solenoid valves, especially AC solenoid valves, should pay attention to their insulation performance. To ensure the operator's personal safety. 5. The reversing valve should have no external leakage, and the smaller the internal leakage, the better. Otherwise, the normal operation of the system will be affected and energy will be wasted. 6. Pay attention to the date of manufacture of the valve. If the reversing valve is left for too long, its lubricating grease will age and affect the normal operation of the reversing valve. The relationship between nominal diameter and hose and interface size is commonly known as nominal diameter pipe outer diameter metric interface thread imperial pipe thread tapered pipe thread 2.54M5×0.834M6×146M8×10168M10×1G1/8”ZG1/8”02810M12×1.25G1/ 4”ZG1/4”031012M16×1.5G3/8”ZG3/8”0415G1/2”20G3/4”25G1”32G11/4”40G11/2”50G2”The above is how to choose pneumatic components "