With the continuous development and progress of science, the valve industry has stood firm in China.The pace of technological innovation has accelerated, and the product structure of mechanical industrial valves has been further optimized. How to use the valve correctly is a necessary knowledge for users. Only correct use can make its use longer. Therefore, the Hydraulic Control Valve Center recommends that you carefully read the instruction manual before installing and using the valve, and operate and maintain the valve in strict accordance with the instruction manual, Negligence and recklessness are one of the main reasons for valve damage.We know that most valves require very little maintenance, which means that most valves do not need to be repaired frequently. Sometimes, even small problems such as simple valve stem leakage are often caused by carelessness. What's more, some reckless operators did not close the valve according to the requirements of the technical specifications, resulting in bending of the valve stem or serious damage to the closing parts. This happens from time to time
Stem nuts and stem threads should be regularly lubricated with lubricating oil, so that not only can reduce friction between them, but also can extend their service life. This is also a very important conservation measure. If the worn valve stem nut is still in use, it may break, so that all axial force of the valve stem cannot be supported, and the valve will lose its function.
Gasket at the beginning of the simple leakage, finally reach the steam leakage hazard. To avoid this danger, the valve cover bolt should be properly tightened at the beginning of leakage; If the sealing surface of the valve seat is improperly selected, it starts with small leakage, then it may be extended to groove leakage, and then the opening height is not enough, which accelerates the erosion of the fluid and leads to the complete damage of the valve seat.
The use, maintenance and repair of common valves are described one by one
Globe valve is a common block valve, mainly used to put through or truncate the medium in the pipeline. In piping systems, the time when the stop valve is not operated is very small, so regular maintenance is required
A small amount of packing leakage can be solved by simply tightening the packing gland nut. However, when the packing is damaged, the packing must be replaced. When replacing the packing, the valve must be fully opened to make the upper seal work (it is generally possible under pressure). During replacement, install proper packing in the packing box, tighten the packing gland nut, and then check regularly to prevent the gland nut from loosening.
When replacing disc parts, it is convenient to lift the stem, disassemble the valve cover, and then install the new disc on the new clamping frame, turn the stem, until the disc is removed from the clamping frame, replaced by a new disc and clamping frame, and loaded into the valve, the operation of replacing the disc is convenient
In order to grind the valve disc (a grindable and replaceable valve), use a small amount of abrasive on the valve disc, and then grind it. The grinding method is to place a shaft pin on the valve disc nut slot and the hole of the valve rod support head, place the component in the valve body, unscrew the connecting sleeve, and then grind it alternately in positive and reverse directions. Use the valve rod as a grinding tool, and grind it after putting abrasive. The grinding should not be excessive. When finishing grinding, clean the abrasive and lubricate the thread
The function of the check valve is to allow only one way through the fluid to prevent backflow of the medium.
The most common type of check valve in urea plant is the lift check valve. Its valve disc moves up and down along the center line of the channel, and its action is reliable, but the fluid resistance is large, which is suitable for small and medium-sized caliber occasions.Lift check valve can be divided into straight-through type and vertical or angle type. Straight-through lift check valve can only be installed in horizontal pipeline, while vertical lift check valve should be installed in vertical pipeline, and the medium flows from bottom to top, while angle lift check valve can only be installed in vertical pipeline
Special care should be taken when adjusting large spring-loaded safety valves, as neither the user, the manufacturer, nor the repair shop has sufficient capacity to accurately check the discharge pressure. No adjustment shall be made to spring-loaded safety valves unless it has been made accurately in the manufacturer or in the actual installation
