The festo pneumatic gripper DHWS-25-A-NC should be in a fully open position to ensure that the diaphragm is stress-free, especially for spring-closed diaphragm valves, this point should be noted. The flange ends of the valve should be sealed with paper to prevent moisture and dirt from entering. When German solenoid valves are used in series, as the opening changes, the pressure difference before and after the valve also changes, thus causing the working characteristic curve of the German solenoid valve to deviate from the ideal characteristic. If the pipeline resistance is large, the linearity will become a fast-opening characteristic, losing the regulating ability. The equal percentage characteristic will become a linear characteristic. In the case of a small flow, due to the lack of pipeline resistance, the above characteristic distortion is not significant, and for the equal percentage characteristic, it is actually unnecessary. From a manufacturing perspective, when Cv is less than 0.05, it is impossible to produce an equal percentage side shape. Therefore, the main problem for small flow valves is how to control the flow within the required range. (2) The influence of sealing surface width on the sealing performance of proportional valves The width of the sealing surface determines the length of the capillary. When the width increases, the travel of the fluid along the capillary becomes longer, and the resistance to movement increases. Increasing the width of the sealing surface can reduce erosion and wear in high-pressure valves. After increasing the width of the sealing surface, the length of the leakage path increases proportionally, thus reducing the leakage amount proportionally. However, increasing the width of the sealing surface, under the same sealing force, the sealing pressure decreases, which can increase the possibility of leakage for pneumatic control valves. Therefore, the width of the sealing surface cannot be infinitely increased. When replacing the packing of the blocking cylinder, the old packing should be removed, but care should be taken not to damage the valve stem, sealing disc, and packing box. After all the old packing is removed, new packing can be installed. When installing new packing, first choose packing that meets the size and performance requirements, do not substitute high for low, large for small, or flatten the packing for use. Then the packing should be cut into single rings, the joints of the packing should be cut into sharp angles neatly, and the length should be appropriate. When cutting the packing, the packing can be tightly wrapped around a rod with a diameter equal to the valve stem diameter, then mark the cutting line, and then proceed with the cutting. The cut packing rings should be added one by one to the packing box, and each ring should be pressed and compacted with a gland or special tool. The joints of each single packing should be staggered. The amount of packing added should be appropriate and leave room for further pressing. The depth to which the gland is pressed into the stuffing box should not be less than the height of the stuffing box, nor should it be greater than. When tightening the gland, the force should be applied evenly, and it is best to turn the valve stem when tightening the packing to check the tightness of the packing on the stem. After the gland is tightened, it should be flat and without tilting. When installing formed packing, if possible, it should be directly套入 the top of the valve stem. When the packing cannot be directly套入, the cut joint method can also be used. 2. In addition, the throttle and moving parts of the pilot valve should try to avoid setting very small diameter orifices to prevent blockage. If necessary, a filter screen should be added, regular maintenance and the setting of bypass pipelines should be carried out. This type of valve has a good development and application prospect. If you want to understand a thing well, then it depends on how much you want to understand. If you want to know thoroughly, then you definitely need to spend more time or experience on it. For steam safety valves, we may usually
Pneumatic gripper DHWS-25-A-NC belongs to the Clamping Jaws, Clamping Plates series under CKD company, model number DHWS-25-A-NC. To purchase or inquire about Pneumatic gripper DHWS-25-A-NC, you can directly contact 158 0047 0089 (Mr. He).
