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Traditional valve parts various skills and solutions

1, conventional valve parts Tip: gland pneumatic actuator leakage: This is the main reason for the program to run, take, drip, leak, because we can often see in the factory. . The reason for the stuffing box leakage can be listed as follows: 1) Whether the packaging is suitable for corrosion resistance, temperature and working medium (2) The packaging method is wrong, especially the package is very prone to leakage at the root; (3 Dry processing accuracy and surface finish are not enough, or have pleasure, or nick; (4) dry pitting corrosion, or lack of protection in the open air and rust prevention; (5) stem bending; 6 packaging has been used for too long Cause aging;
The method to remove the filler leakage is: (1) correctly select the package; (2) use the correct method to load; (3) for dry processing failure, we must repair or replace. The minimum surface roughness should reach %5, the more important subject needs to achieve more than %8, there should be no other defects; (4) We need to take protective measures to prevent corrosion, for those who have already eroded us need to change them (5) valve The rod has a curved straightening or renewal; (6) has been used after the period of packaging, we need to replace it. (7) All landowners must pay attention to smooth operation, slow opening and slow closing to prevent temperature changes or moderate impact.
2, conventional pneumatic ball valve parts Tip: pneumatic closing parts electric actuator: usually we say that the gland leaks out leaks and the closing parts leak in the leak. The Kexian member leaked inside the valve, which is not easy to find. Closed parts leaks can be divided into two categories: one is the sealing surface leakage, and the other is the sealing ring root leakage.
The reasons for the leakage are: (1) discomfort of sealing surface grinding; (2) sealing ring, valve seat and valve flap without chest tightness; (3) unreliable connection between disc and valve stem; (4) valve stem bending and twisting to make up and close (5) If the shutdown speed is too fast, the bad sealing surface will be in contact or damaged; (6). The improper selection of materials can not withstand the corrosion of the medium; (7) the sealing surface can not withstand the erosion of high-speed flowing medium; (8) Today, some media after the valve is closed and cooled, so that in the thin coal seam sealing surface, this also produces erosion; 9) Some uses the coupling between the threaded seat and the sealing surface on the disc, which tends to produce oxygen concentration in the cells, loose corrosion; (10) sometimes the spool can be inserted by embedded impurities such as welding slag, rust , the production system of dust or mechanical parts, so that the pneumatic regulating valve can not be locked. Precautions include: (1) Before use, it must be carefully tested for leaks. Once we find a leak in the sealing surface or a leak at the root of the seal, we must deal with it before we use it again, (2) we need to check the valve part in advance, we Valves that cannot be connected by dry bending or twisting discs and unreliable stems.
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