VALVE

  At present, the commonly used hardening processes for the surface of  metal hard sealed ball valves  mainly include the following: (1) Surface welding (or spray welding) of hard alloy on the sphere can achieve a hardness of over 40HRC. The process of surface welding of hard alloy on the sphere is complex, with low production efficiency, and large area welding can easily cause deformation of the parts. Currently, there is relatively little use of surface hardening technology on the sphere. (2) The surface of the sphere is plated with hard chromium, with a hardness of 60-65HRC and a thickness of 0.07-0.10ram. The chromium plating layer has high hardness, wear resistance, corrosion resistance, and can maintain surface brightness for a long time. The process is relatively simple and the cost is relatively low. However, the hardness of the hard chromium coating will rapidly decrease as the temperature increases due to the release of internal stress, and its working temperature cannot exce

  Check valves   may be the most easily misunderstood valve in history. If you mention check valves to most factory personnel, the typical reaction is "they don't work.". In fact, these personnel are likely to have removed internal components or refurbished the system to avoid using check valves. In other words, these valves may be the least popular valves currently in use. This article will explore the basic knowledge of check valves, how they work, what types they are, how to select and install them, how to solve their problems, and why they are not always problems. Simply put, check valves allow one-way flow and automatically prevent backflow (backflow) when the fluid in the pipeline is reversed. They are one of the few automatic valves that do not require auxiliary opening and closing. Although some valves can be equipped with external counterweights and damping devices in special circumstances, most valves do not have open/close control or external assistance from ot

  Globe valve , also known as shut-off valve, belongs to the forced sealing type valve and is a type of shut-off valve. There are three types of connection methods: flange connection, threaded connection, and welded connection. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom, so there is directionality during installation. The globe valve is designed with low inlet and high outlet to reduce flow resistance and save effort when opening the valve. When the valve is closed at the same time, the gasket between the valve shell and valve cover, as well as the packing around the valve stem, are not subjected to force and will not be affected by medium pressure and temperature for a long time. This can prolong the service life and reduce the probability of leakage. In addition, this can also replace or add packing when the valve is closed, making maintenance easier. In general, globe valves are l