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The valve stem adopts the double sealing structure of bellows and packing.

The valve stem adopts the double sealing structure of bellows and packing.

2024/03/26

The valve stem adopts the double sealing structure of bellows and packing. The bellows is welded with the inner ring and outer ring to form the bellows assembly, and then welded with the valve stem and guide body to prevent the medium from leaking out through the valve stem. The valve stem moves up and down from the flat key I until the upper end face of the flat key I contacts the lower end face of the lower packing. As the lower packing is made of PTFE material, if the valve is opened excessively, the flat key I will be embedded in the packing, the valve can no longer be opened and closed, and the bellows assembly will be killed, resulting in medium leakage along the valve stem. The stretching length and compression of the bellows are determined according to the valve stroke. If the stretching or compression exceeds the limit, the bellows may be damaged, resulting in small braided pipe rupture and seal failure. Therefore, it is necessary to increase the opening and closing limit device of the valve, so that the bellows can expand and contract within the design range during the opening and closing process of the valve.

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The commonly used stop valves are as follows:

The commonly used stop valves are as follows:

2024/03/26

Angle stop valve; In the angle globe valve, the fluid only needs to change its direction once, so that the pressure drop through the valve is smaller than that of the conventional globe valve.

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The stem axis of the stop valve is perpendicular to the sealing surface of the valve seat

The stem axis of the stop valve is perpendicular to the sealing surface of the valve seat

2024/03/26

The stem axis of the stop valve is perpendicular to the sealing surface of the valve seat. The relatively short opening or closing stroke of the valve stem and its reliable cut-off action make the valve very suitable for medium cut-off or adjustment and throttling.

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Huacheng’s products are well-known in Zhejiang province, and our brand of “JY” was recognized as one of the most prominent register brands in Ningbo city

Huacheng’s products are well-known in Zhejiang province, and our brand of “JY” was recognized as one of the most prominent register brands in Ningbo city

2024/03/26

Huacheng’s products are well-known in Zhejiang province, and our brand of “JY” was recognized as one of the most prominent register brands in Ningbo city. In 2006, we successfully registered our brand (“JY”) in Madrid. Our products are recommended by the Chinese Bureau of Commercial Affairs as a recognized export brand.

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The design and development of high-technology products are presently underway at our professional engineering technical center

The design and development of high-technology products are presently underway at our professional engineering technical center

2024/03/26

The design and development of high-technology products are presently underway at our professional engineering technical center, which is staffed with about 50 technical staff members. We have more than 500 high-end valve manufacturing equipments and 50 high-speed, high-accuracy and multifunctional special purpose machines imported from Taiwan. And there are more than 50 equipment available for hydraulic and air pressure testing.

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What should be paid attention to when using and installing the clip check valve

What should be paid attention to when using and installing the clip check valve

2024/03/26

The clamp type check valve is one of the check valves. Check valve refers to the valve which opens and closes the disc automatically by the flow of medium itself, which is used to prevent the medium from flowing backward. It is also called the check valve, one-way valve, counter-current valve and back pressure valve. Check valve belongs to an automatic valve, its main function is to prevent the medium from flowing backward, prevent the pump and drive motor from reversing, and the discharge of the container medium. Check valves can also be used to provide makeup lines to the auxiliary system in which the pressure may rise above the system pressure.

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Failure analysis and treatment of bellows globe valve

Failure analysis and treatment of bellows globe valve

2024/03/26

The leakage of bellows globe valve is generally divided into internal leakage and external leakage, and there are many reasons for leakage. In general, the liquid medium contains solid impurities to destroy the sealing surface and cause failure. Combined with the analysis of the field application, the main reasons for the leakage of the valve stem are related to the valve structure, working environment and operation mode.

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What kind of working conditions need to select the stop valve

What kind of working conditions need to select the stop valve

2024/03/26

Stop valve is one of the more widely used valves. The reason why it is widely popular is that in the process of opening and closing, the friction between the sealing surfaces is small, it is relatively durable, the opening height is not large, it is easy to manufacture, and it is convenient to maintain. It is not only suitable for medium and low pressure, but also suitable for high pressure. The closing principle of the stop valve is to make the sealing surface of the valve disc and the sealing surface of the valve seat close together by relying on the pressure of the valve rod to prevent the medium from flowing. It can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this type of shut-off valve is very suitable for cut-off or regulation and throttling. Because the opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is directly proportional to the stroke of the valve disc, it is very suitable for regulating the flow.

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Cause analysis of wide application of bellows globe valve

Cause analysis of wide application of bellows globe valve

2024/03/26

Bellows globe valve is a kind of globe valve, which is one of the more widely used valves. Its popularity is due to the small friction between sealing surfaces in the process of opening and closing, relatively durable, small opening height, easy manufacturing and convenient maintenance. It is not only suitable for medium and low pressure, but also suitable for high pressure. The closing principle of the stop valve is to make the sealing surface of the valve disc and the sealing surface of the valve seat close together by relying on the pressure of the valve rod to prevent the medium from flowing. It can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this type of shut-off valve is very suitable for cut-off or regulation and throttling. Because the opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is directly proportional to the stroke of the valve disc, it is very suitable for regulating the flow.

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