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The principles and precautions for valve pressure testing are as follows: (1) Under normal circumstances, valves are not subject to strength tests, but valve bodies and valve covers that have been repaired or damaged by corrosion should be subject to strength tests. For safety valves, their constant pressure, backseat pressure and other tests should comply with the instructions and relevant regulations. (2) Strength and sealing tests should be carried out before the valve is installed. 20% of low-pressure valves shall be randomly inspected. If they are unqualified, 100% shall be inspected; medium and high-pressure valves shall be inspected 100%….

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Drain valve: Before being used, the dirt and impurities in the pipeline should be discharged to prevent it from being blocked by debris and failing to work properly. During operation, check the working condition of the trap. If too much steam is discharged, it means that the valve is not working properly. If only water is discharged, it means that the valve is working normally. ​Safety valve: The safety valve should undergo constant pressure inspection regularly, and the constant pressure records and labels should be made. Before installation, it should pass the pressure test and constant pressure inspection. In…

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Safety valve is an overpressure relief device widely used on boiler pressure vessels. Whether its performance can meet the requirements is crucial to the safe operation of boiler pressure vessels. According to relevant regulations, safety valves should be inspected regularly, at least once a year. Article 145 of the “Steam Boiler Safety Technical Supervision Regulations” stipulates that for safety valves of newly installed boilers and safety valves after maintenance, their opening pressure (set pressure) and sealing pressure must also be inspected. Our country stipulates that the sealing test pressure of safety valves for steam boilers shall be the smaller…

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1. The structure adopts the eccentric-wedge principle. The rotation center of the valve body and valve core (i.e., the valve stem axis) is offset by a radial dimension from the geometric center of the sealing spherical surface of the valve core, and is also offset from the valve seat sealing surface on the valve body channel axis. The sealing pair is Metal-to-metal contact under the action of external force, the valve relies on two eccentricities to achieve self-locking closing. The reasonable selection of eccentricity makes the self-locking angle smaller than the friction angle. If the self-locking angle is too…

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The foot valve is an energy-saving valve and a type of check valve. Generally installed at the bottom of the underwater suction pipe of the water pump. It restricts the return of liquid in the water pump tube to the water source, and has the function of only entering but not exiting. There are many water inlets and reinforcing ribs on the valve cover to prevent clogging. It is mainly used in water pumping pipelines. The role of water channels and supports. The calibers include single-valve, double-valve, and multi-valve types. There are flange connections and threaded connections. Other names:…

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1 Overview The high-pressure hydrogenation process is an important means of deep processing of petroleum. It can not only improve the recovery rate of light oil per unit of crude oil. And it can improve the quality of fuel oil, thereby improving the overall efficiency of the refinery. The high-pressure hydrogenation device can also provide high-quality raw materials for petrochemical devices and is also an ideal device for oil desulfurization. China began the construction of high-pressure hydrogenation units in the 1990s. It is expected that in the next few years, as the amount of foreign oil refining in our…

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Shanghai Fanggong believes that the pump valve is one of the key components and wearing parts of the drilling pump, and its design directly affects the working performance and service life of the pump. On the one hand, to improve the erosion resistance of the pump valve contact surface, it is necessary to increase the surface hardness of the contact surface, and excessive hardness will weaken the impact resistance. On the other hand, in order to improve the material’s ability to withstand impact loads, it is necessary to ensure that the material has high toughness, and the corresponding hardness…

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Valve installation requirements Hebei Zhenchen believes that the quality of valve installation will directly affect the future use of the valve. Therefore, construction units and production units should pay great attention to it. The installation of the valve should be carried out in accordance with the valve instruction manual and relevant regulations. During the construction process, careful inspection and careful construction are required. Before installing the valve, the pressure test should be passed before installation. Carefully check whether the specifications and models of the valve are consistent with the drawings, check whether all parts of the valve are intact,…

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Hydraulic device is a driving device that uses hydraulic force to open, close or adjust valves. It consists of three parts: control, power and actuator. The control part consists of pressure control valve, flow control valve, directional control valve, etc. and electrical control system. The power part is composed of an electric motor or a pneumatic motor, a hydraulic pump, a fuel tank and other parts. It converts the effective power on the rotating shaft of the electric or pneumatic motor into fluid pressure energy for hydraulic transmission. There are two types of actuators, one is a hydraulic cylinder…

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The safety valves produced by Hebei Zhenchen Machinery Equipment Group Co., Ltd. are widely used as overpressure relief devices on boiler pressure vessels. Whether their performance can meet the requirements is crucial to the safe operation of boiler pressure vessels. According to relevant regulations, safety valves should be inspected regularly, at least once a year. Article 145 of the “Steam Boiler Safety Technical Supervision Regulations” stipulates that for safety valves of newly installed boilers and safety valves after maintenance, their opening pressure (set pressure) and sealing pressure must also be inspected. Our country stipulates that the sealing test pressure…

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