Pipeline valve selection and installation - related to pipe safety factor

The selection of pipeline valves relates to the long-term use and operation of the device, and the installation of pipeline valves directly relates to the safety of pipeline valves. Therefore, understanding the characteristics of the valve and the steps and the basis for selecting the valve also become crucial. The next small series of pipe valves for everyone to choose and install knowledge.

[pipeline valve how to choose]
1, clear the use of the valve in the device or device, determine the working conditions of the valve: the applicable medium, working pressure, working temperature and so on.
2. Determine the nominal diameter and connection method of the pipe connected with the valve: flange, thread, and welding.
3, determine the mode of operation of the valve: manual, electric, electromagnetic, pneumatic or hydraulic, electrical linkage or electro-hydraulic linkage.
4, according to the pipeline conveying medium, working pressure, working temperature to determine the selected valve housing and internal parts of the material: gray cast iron, malleable cast iron, ductile iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloys.
5, choose the type of valve: closed-circuit valves, regulating valves, safety valves and so on.
6, determine the type of valve: gate valve, globe valve, ball valve, butterfly valve, throttle valve, safety valve, pressure reducing valve, steam trap and so on.
7, determine the valve parameters: For the automatic valve, according to different needs to determine the allowable flow resistance, discharge capacity, back pressure, etc., and then determine the nominal diameter of the pipe and the diameter of the valve seat hole.
8. Determine the geometric parameters of the selected valve: structure length, flange connection form and size, dimensions of the valve height direction after opening and closing, the size and number of bolt holes connected, and the overall size of the valve.
9, the use of existing information: valve product catalog, valve product samples and other appropriate choice of valve products.

[Pipeline valve installation]
1. Before installing the pipeline valve, the installer needs to carefully check the signs on the pipeline valve, installation instructions, etc. to ensure that the installation is safe and correct. In addition, the installation of the pipeline valve needs to clean up the interior of the installation, mainly to reduce the clogging of the valve.
2. As the key button of the pipeline, the valve needs to be installed in a place where the space is relatively large. It is necessary to connect the transmission device and then erect the pipeline valve, so that the valve can be operated and inspected promptly and conveniently .
3, when the valve is installed, the installer needs to follow the direction of the medium flow as the installation direction. The purpose of this is to ensure that the direction of flow of the medium is consistent with the direction of the valve.
4. For the parts of the link valve of the pipeline, the installation of the pipeline valve shall adopt the diagonal direction, and then the pipeline valve shall be tightened and shall not be tightened once.
5, according to the arrow of the pipeline valve and the indication of closing, etc., the valve is rotated into place, even if the installation is completed.

Xiao Bian concludes: The use of the valve in the pipeline is directly related to the safety of using water, so we need to take it seriously at all times. It is hoped that the selection and installation of pipeline valves above Xiaobian can help everyone. For more relevant knowledge, please continue to pay attention to this website information platform.

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Paint Roller

Drum brush is divided into long hair, medium hair, short hair three kinds, its performance is the length of the drum brush hair, rather than the thickness and length of the drum itself, brush hair is usually divided into wool and chemical fiber two kinds.

Different rollers will brush different effects, long hair rollers will brush out some fine texture, concave and convex feeling, similar to the texture effect. The paint surface after short wool roller besmear is more uniform, smooth, without concave and convex feeling, in the wool is between the two.

Roller brush is mostly made of wool and foam plastic, which can be divided into paint drum brush, hair drawing drum brush, floor paint drum brush, flat coating drum brush, etc., mainly used for large-area paint rolling in architectural decoration engineering. And can be used for coating and rolling all kinds of paint, such as: latex paint, anti-rust paint, internal and external wall paint, wallpaper glue, etc.
Note:
The use of drum brush as long as the straight brush can be wiped, if you want to daub evenly, the drum is best in the paint bucket to be fully absorbed, and then take out a few rolling on the inclined plane, press out the excess paint and then begin to brush the wall.

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