2.3 The design and verification of valve stems A valve stem is the main part of a valve. If the valve is deformed or broken during use, it will cause an accident. Therefore, the strength of the valve must be checked to ensure that it can withstand the force within a certain range. 20Gr13 is used as the valve's material, which has good plasticity, toughness and wear resistance after heat treatment. The outer diameter of the valve is set to 70 mm, and the inner diameter...

Abstract By analyzing the working principle of the wedge gate valve with large diameters, an optimal design scheme for the structure of the wedge gate valve with large diameters is proposed. Design the size of the corresponding parts, and optimize the calculated size according to the use requirements; select the materials of each part reasonably. The results show that the design meets the requirement for strength. Background A gate valve with a large...

Protection and management during construction 1. During the construction, it is very important to manage and protect the ball valve scientifically. The good management of the equipment can not only guarantee safety, but also greatly reduce the cost of construction and operation management. The following aspects should be paid attention to: ① Use precise methods to load and unload the valve to prevent mechanical damage to the valve. When hoisting the valve, the hoisting belt must not be tied...

The problems existing in the tooling for strength and sealing performance tests of high-pressure valves are analyzed, and the structural characteristics, working principles and performance of the new type of testing tooling designed based on the principle of O-ring sealing are introduced in this article. 1. Overview The high pressure valve must be subjected to a strength test and a sealing performance test before leaving the factory. Frequent use of test tooling and high pressure...

What is a valve? In the fluid piping system, a valve is a control element whose main function is to isolate the equipment and the piping system, adjust the flow, prevent backflow, adjust and release the pressure. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. Since it is very important to choose the most suitable valve for the piping system, it is also important to know the characteristics...

Attention should be paid to the following precautions for installing valves: Confirm that the valve meets the design requirements and relevant standards before installing the valve. When moving and installing the valve, prevent bumps and scratches of the valve. Before installing the valve, clean the inside of the pipeline to remove iron filings and other impurities to prevent foreign matter from getting into the valve's sealing seat. In addition, the valve should be closed during installation....

Large-diameter globe valves are generally used in boiler outlets, main gas-distributing cylinders, main steam pipes and so forth. Generally, the pressure difference at the boiler outlet is large, so the steam velocity is high and the erosion destruction to the sealing surface is great. In addition, the combustion efficiency of the boiler cannot be 100%, otherwise the steam at the outlet of the boiler will have a large water content, easily causing cavitation to the valve...

1. For the main pipeline used for oil and natural gas transmission, as well as the pipe that needs to be cleaned and buried underground, the ball valve with full bore and fully welded structure should be selected. 2. For the pipe buried above ground, choose full bore ball valve with welded connections or flange connections. For branch pipes, pick ball valves with flange connections or welded connections, full bore ball valves or reduced bore ball valves....

Like other fields, the valve industry also faces some difficulties. Only by solving these problems as soon as possible can the valve be better applied to the pharmaceutical industry. First, R&D investment is insufficient for a long time. Insufficient investment in scientific research has become an important factor restricting independent research and development of valve enterprises. Second, the capacity for independent innovation is weak. Although China's pump manufacturing industries have...

1. Check whether the ball valve is in the fully open position. After injection of grease, first check whether the diameter of the ball is flush with the inner cavity plane of the valve seat. If there is any difference, adjust the stop bolt on the actuator to ensure that the valve is fully open. Otherwise, once the valve is installed, it is impossible to judge whether the valve is in the fully open position. 2. Lubricating grease can't be injected into the valve. (1)...

In most cases, austenitic stainless steel is a widely used valve material, and the valve made from this material can be applied to the pharmaceutical industry. In the clean piping system of the pharmaceutical industry, there are special requirements for valves to avoid stagnant water as much as possible. "Among the many valves, the diaphragm valve is commonly used. Due to its special design, the medium in the pipeline will not contact pipe fittings except the gasket,...

1. Which three main factors should be considered in selecting valve actuators? (1) The output of the actuator should be greater than the load of the valve. (2) During the check of standard combination, consider whether the allowable pressure difference of the valve meets the technological requirements. When the pressure difference is large, the unbalanced force on the valve core should be calculated. (3) It is necessary to consider whether the response speed of the actuator meets...