How to properly use the valve is the user must master the knowledge that only the correct use of its longer use, so the hydraulic control valve center recommends that you install the valve must be carefully read before using the manual, in strict accordance with the valve manual Operation and maintenance, negligence and recklessness is a major cause of valve damage. We know that most valves require very little maintenance, which means that most valves do not have to be repaired often. Sometimes even a simple stem leak such a small problem, often caused by negligence and big problem. What is more, some reckless operators do not close the valve as required by the specifications, resulting in serious valve stem bending or closing parts. This happens from time to time. Stem nut and stem thread should be regularly lubricated with lubricating oil, so that not only can reduce the friction between them, but also to extend their service life. This is also a very important protection measure. If the worn stem nut is still in use, a break may occur, so that the entire axial force of the stem is not supported and the valve will lose its function. Gasket at the beginning of a simple leak, and finally to the hazards of steam leakage. To avoid this danger, the valve cap bolts should be properly tightened at the beginning of the leak. If the valve seat sealing surface is not properly selected due to improper material, a small amount of leakage starts, which may later extend to the leak in the groove, and the opening height is not enough This accelerates fluid erosion and results in complete seat damage. The reason for the bending of the stem may be due to the operator turning the hand wheel excessively after closing the valve. There are many reasons for valve damage. In fact, a similar situation may be avoided if the operator is slightly trained. Now common on the use of several valves, maintenance and repair one by one to be described. Globe valve is a commonly used cut-off valve, mainly used to connect or cut off the medium in the pipeline. In the pipeline system, the time is not operating shut-off valve is very small, because some, to be regularly maintained. A small amount of packing leakage, can be simply tightened packing gland nut solution. However, when the packing is damaged, the packing must be replaced. When replacing the packing, the valve must be fully open to allow the upper seal to function (under pressure as is generally possible). Replacement packing box filled with the appropriate filler, and tighten the packing gland nut, but also after a regular check to prevent the gland nut loose. When replacing the valve disc parts, lift the valve stem, disassemble the bonnet, and install a new valve disc on the new holder. Turn the valve stem until the disc is disengaged from the holder. With the new valve disc And the holder instead of, and into the valve, the replacement valve disc operation is convenient. In order to grind the valve flap (which can grind the renewed valve), a small amount of abrasive is applied to the flap and then ground. Grinding method is in the valve nut groove and stem support head hole placed on a pin, the components placed in the valve body, unscrew the connection sleeve, and then forward and reverse alternately ground. Use the stem as a grinding tool, after grinding into abrasive, grinding should not be excessive. When grinding is complete, remove the abrasive and lubricate the threads. The function of the check valve check valve is to allow fluid to pass in one direction only to prevent backflow of media. Urea device is the most common lift check valve, the valve along the channel centerline for lifting movements, reliable action, but the fluid resistance, suitable for small and medium-sized occasions. Lift check valve can be divided into straight and vertical or angle type. Straight through the lift check valve can only be installed in the horizontal pipe, and vertical lifting check valve should normally be installed in the vertical pipe, and the media flow from bottom to top, and the angle lift check valve can only be installed in the vertical The pipeline. Special attention should be paid when adjusting large spring-loaded safety valves because neither the user nor the manufacturer nor the repair shop has enough capacity to accurately verify the discharge pressure. Any adjustment to the spring-loaded safety valve shall not be permitted unless it is accurately adjusted at the manufacturer or on the actual installation.