Now, many factories in the boring machine by marking the processing of the ball shaft hole. Because the ball shaft hole processed by this method is not the working position of the ball in the valve, the error is large. Failed to meet the drawing requirements. The overall error generated after assembly has a serious impact on the sealing, resulting in valve leakage. It can be seen that if the coaxiality of the upper and lower shaft holes is low, the upper and lower shafts and composite bearings are involved in the assembly to eliminate interference. Only increase the radial dimension of the bearing. Make the contact between the ball and the valve seat produce clearance. The soft sealing pneumatic ball valves such as rubber and tetrafluoroethylene can still meet the requirements of sealing without leakage, but the opening and closing torque and seal ring wear are increased. For the metal sealed pneumatic ball valve, sealing without leakage cannot be achieved. Because the spherical shaft hole is processed by scribing correction. The coaxiality error is 6 ram, and leakage occurs after assembly. In order to meet the requirement of coaxiality, after the sphere is processed, the shaft hole shall be processed on the CNC boring machine or digital display boring machine. Because the diameter accuracy of the boring machine spindle is high, the ball center can be found directly. After the shaft hole on one side is processed, the boring machine workbench rotates 180 degrees, and the spindle of the boring machine is used to calibrate again to process the shaft hole on the other side. The shaft hole processed by this method has high position accuracy and small coaxiality error. The ball of pneumatic ball valve is generally chrome plated on the surface of 1Cr18Ni9Ti or carbon steel. Since the spherical surface has sharp corners formed by channels and shaft holes, according to the electroplating principle, the coating on the sharp corners is thicker, and the deviation between the actual thickness and the average thickness is about 30% or more. Although the ball was grinded after turning, after electroplating, the coating thickness was uneven, and the roundness of the ball was out of tolerance, resulting in leakage between the valve seat and the ball of the metal sealed pneumatic ball valve,

How to select the model and specification of stainless steel pneumatic butterfly valve
If the data needs to be measured at any time by large enterprises and applicable units in Northeast China, our company promises to arrange Shenyang garrison personnel to arrive at your site as soon as possible, and confirm the way and stop production on the same day!
Stainless steel pneumatic butterfly valve enterprises briefly introduce several points about how to select products to achieve the best service life and how to prevent the selection of inferior products The medium temperature is determined by the material, which is generally 321, 304, 316, 316L and other stainless steel materials.
2. Pressure is also an item for users to think about. The design of the product pressure is mainly the thickness of the bellows, which is what industry insiders are unwilling to do for customers. The internal structure design can reduce the cost of the product. The pressure range for industrial use is also different from that for water heating. The common one is 0.1-2.5MPA, and the special one can be customized to reach 30Mpa 3 The simplest way to identify materials in the industry is to use magnets to absorb iron. Other ways to identify carbon steel are: color identification, identification of commonly used magnets, identification of copper sulfate, and the following three methods to stop identification of steel grades with special properties The simplest and most direct way to identify grinding, annealing and chemical qualitative methods is to use stainless steel liquid. 4. Welders of product assembly: this is directly related to the company's professional equipment and professionals. 1. Welding data: welding rods and wires used; 2. Total number of welded junctions: total number of welded junctions of the pipeline (including fillet weld and flange fillet weld seam); 3. Weld junction unevenness: refers to the maximum and minimum difference of weld junction reinforcement; 4. Weld reinforcement layer: the weld reinforcement, and the width is the weld width; 5. Undercut: the depth is the deepest. 6. Appearance quality inspection conclusion: qualified or unqualified. 7. Steel seal of welding welder: several welders participated in the pipeline.