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Abstract: In the heating system, the valve is common to be seen and there are many types. Its main function is to control the flow of the medium, and play a role in assisting the pipeline work. Valves of high quality and suitable types can ensure the normal and safe operation of heating projects. The valve is the key control part in the fluid conveying system. The problems of medium control, diversion and closing in the heating engineering all depend on the control of the valve part. There...
Selecting Valves Used for Heating Engineering (Part One) Read
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For stainless steel valves, it is generally believed that they are not easy to rust, but in fact, stainless steel will rust. Stainless steel can be corrosion resistant because of the formation of a chromium-rich oxide film or passivation film on its surface. Tests have shown that when the chromium content reaches a certain proportion, the corrosion resistance of steel will change drastically, from being easy to rust to not being easy to rust, and from non corrosion to corrosion. In order to check...
Reasons for Rust of the Stainless Steel Valve and Its Solutions Read
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During the voyage of a ship, it was found that there were leaks in the sprinkler system. After inspection, it was found that the valve disc of the copper alloy globe valve in the system was corroded, and the valve disc and the valve seat were not sealed well, resulting in leakages in the pipeline's sprinkler system. The schematic diagram of the sealing is shown in picture 1. The valve of this system has been put into use for less than 3 years, and many similar situations have occurred. In order...
Causes of Failures of Copper Alloy Globe Valve Seals Read
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1. Leakage under pressure in packing of power plant valves There are also many methods for dealing with external leakages of power station valves. Among them, the one with relatively good safety is the injection type under pressure, which has been concluded in detail. This method uses special fixtures and hydraulic injection tools to inject the sealant into the sealed cavity formed by the fixture and part of the outer surface of the leaking part. This treatment for dealing with leakages is more...
Dealing with External Leakages of Power Station Valves Read
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The power station valve is the main part in the safe operation of the power station, and its importance is self-evident. When it is used, external leakage is often prone to occur. If it is not handled properly, once leakage occurs, it will not only affect industrial production to a certain extent, but also endanger the safety of people's lives and properties; sometimes, it even affects the harmony and stability of society. The power station valve is connected to the main and auxiliary equipment...
External Leakages of Power Station Valves Read
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2.2 Maintenance in operation In order to prolong the service life of the ball valve, reduce losses caused by failures, and bring greater economic benefits, it is also necessary to do a good job in maintenance during operation. Its maintenance mainly includes the following aspects: First, a scientific and reasonable inspection plan must be formulated according to the actual situation of natural gas transportation. Valves must be inspected regularly for sealing, corrosion and damage. Once a problem...
Maintenance of Ball Valves in Pipelines Transporting Natural Gas (Part Two) Read
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Abstract: A ball valve is a device with good sealing performance, long service life and economical safety that has been widely used in pipelines transporting natural gas. However, in the actual installation construction and post-maintenance, a small mistake will lead to leakages, and the impact will be very great. At this time, it is necessary to do a good job in the maintenance and troubleshooting of ball valves, and apply efficient and feasible technical methods to ensure the safety and smooth...
Maintenance of Ball Valves in Pipelines Transporting Natural Gas (Part One) Read
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The coverage of welding procedure qualification is closely related to the basic variables of welding, which are the main parameters of the welding method. If the change exceeds a certain limit, a new welding procedure must be established. Some basic variables are determined in the systems of NB/T 47014-2011 and GB/T 22652-2019, and these basic variables include welding method, the thickness of surfacing layers, types and thickness of base metal, filler metal, welding positions, heat treatment...
Differences in Process Evaluation Coverage Read
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A check valve is a valve whose opening and closing parts are opened or closed by the force of the flow to prevent the backflow of the medium. The check valve belongs to automatic valves, which is used for pipelines with a single flow. The quality of the check valve is very important. The normal and continuous work of the check valve guarantees the operation of the project. Therefore, the quality inspection of the check valve in advance can achieve the purpose of safe operation. Therefore, how do...
Testing Check Valves Read
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The surface of the manual cast steel hard-sealed ball valve body adopts advanced spraying technology, and the highest hardness can reach HRC78 after various treatments. The processing of the valve seat's sealing surface can make the trunnion ball valve's hardness reach HRC72. The ball and valve seat are paired and ground, and all sealing areas of the entire sealing surface of the ball valve are precision ground. The hard sealed manual trunnion ball valve is suitable...
Hard Sealed Trunnion Manual Ball Valves Read
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