Blog

22

2020

/

06

Principle of valve pressure test

Valve production must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is Wuhan Xiete Valve Technology Co., Ltd. meets the requirements of production regulations. Valve pressure test must follow the following principles and precautions: (1) Under normal circumstances, the valve does not have strength test, but the valve body and valve cover after repair or corrosion damage The valve body and valve cover should be tested for strength. (2) the valve should be installed before the strength and tightness test. Medium and high pressure valves should be 100% inspection. (3) During the test, the valve installation position should be in the direction of easy inspection. (4) welding connection form of the valve, with blind plate

19

2020

/

06

Industry demand for stainless steel valves

Stainless steel valves have become a necessity in our production and life, especially in the petroleum industry, the application of stainless steel valves is indispensable. The petrochemical industry has developed rapidly in recent years, and the demand for stainless steel valve products and demand types are also increasing. In fact, not only the petrochemical industry, the demand for stainless steel valve products in many other industries is also increasing, and the requirements of models and specifications are becoming more and more complete. From product quality to product appearance, our stainless steel valve products are getting better and better. Stainless steel valves made of materials compared to cast iron valves for environmental protection, the development of large space. in the scale

15

2020

/

06

Valve maintenance tips

Maintenance method 1, the valve should be placed in a ventilated and relatively dry indoor, the valve passage at both ends to be blocked. 2. If the storage time is relatively long, it should be checked regularly and cleaned regularly. After cleaning, anti-rust oil should be applied. After installation, we must also regularly check whether the valve is normal and the degree of aging. The main inspection items include:(1) the sealing surface wear. (2) the valve stem and stem nut trapezoidal thread wear. (3) Whether the packing is outdated and invalid, if damaged, it should be replaced in time. (4) After the valve is overhauled and assembled, the sealing performance test shall be carried out. The valve should also be filled with grease regularly.

27

2020

/

05

Different types and characteristics of fillers

19

2020

/

05

The difference between stop valve and gate valve

From the structure: the length of the gate valve is shorter than the cut-off valve, the height is higher than the cut-off valve, the gate valve installation should pay attention to the height. This in the case of limited installation space selection to pay attention. The gate valve can rely on the medium pressure tightly and the sealing surface closed, so as to achieve the effect of no leakage. When the opening and closing of the valve core and valve seat sealing surface always contact and friction, so the sealing surface is easy to wear, the gate valve is close to close, the pipeline before and after the pressure difference is very large, so that the sealing surface wear is more serious. From the principle: the valve is rising stem type, the hand wheel with the stem to do rotation and rising movement. Gate valve is the hand wheel rotation, the stem to do the upward movement. Flow varies

21

2020

/

04

Analysis of valve drive mode

In environmental protection, water conservancy, petrochemical, metallurgy, papermaking, electric power, aerospace, pipelines, industrial equipment, industrial processing and other fields need to use a large number of valves to control fluid movement. The drive device that controls the opening, closing or partial switching of the valve is usually called a valve actuator or a valve driver. As the terminal actuator of valve control, the reliability, controllability and function of the actuator will directly affect the success or failure of the adjustment and control results and the safety of the equipment, and restrict the improvement of the overall level of automation.

28

2020

/

03

Six kinds of flange gasket performance introduction

Flange gaskets are used in pipeline flange connections. They are seals between two flanges. The medium, pressure and temperature directly affect the selection of flange gaskets. Six kinds of flange gasket performance introduction Graphite gasket: flat gasket made of soft graphite, suitable for high temperature, strong corrosive medium. Metal gaskets: Metal gaskets are made of pure iron, extremely soft steel, stainless steel, aluminum and other materials. The machining accuracy and surface roughness of the sealing surface of metal gaskets are very high, and the bolt pressing force is very large. They are used in high temperature and high pressure valves. Metal coated graphite gasket: made of thin metal coated annular asbestos gasket. Soft seal butterfly valve is generally used in concave

09

2019

/

12

Five methods to deal with the leakage of electric control valve

Method 1: increase the sealing grease method This method is not yet used for sealing grease valve body, you can consider increasing the sealing grease to improve the sealing performance of the valve stem. Usually daily maintenance of electric control valve, increase the supplementary sealing grease is also one of the necessary maintenance procedures. Method 2: Change the flow direction and place P2 at the valve rod end method. When △P is larger and P1 is larger, sealing P1 is obviously more difficult than sealing P2. Therefore, the method of changing the flow direction can be adopted to change P1 to P2 at the end of the valve rod, which is more effective for valves with high pressure and large pressure difference. Such as bellows valve should usually consider sealing P2

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