In order to facilitate daily protection, the magnetic flap level gauge is usually equipped with a matching valve, which can conveniently drain the internal cavity of the float during the inspection, which affects the operation of the liquid medium with impurities. We know that there are many types of valves. There are gate valves, ball valves and globe valves. Each valve has its own characteristics that are different from other types. How to select the corresponding valve correctly will bring great protection for our future protection. For convenience, we recommend that users first fully inquire about the company's working conditions and select according to actual production needs before selecting. If there are doubts, you can first fully communicate with the technical personnel of the instrument production enterprise This situation is clearly controlled.
This article will give you an introduction to how the user chooses the valve type of the magnetic flap liquid level gauge. First of all, we introduce the influence and concept of various valves.
1. Ball valve
The opening / closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid adjustment and control. Among them, the hard-sealed V-shaped ball valve has a strong shear force between the V-shaped core and the metal seat of the welded hard alloy, especially suitable for fine solid particles containing fibers. And other media. The multi-way ball valve can not only flexibly control the branching, shunting, and flow direction of the medium on the pipeline, but also can close any channel and connect the other two channels. This type of valve should normally be installed horizontally in the pipeline. Ball valve classification: pneumatic ball valve, electric ball valve, manual ball valve. It is usually enough to use a manual ball valve to interface with the flange interface of the magnetic flap level gauge. It has wear resistance, good sealing performance, light switch strength and long service life. Flange connection is usually more than a ball valve
2. Gate valve
Advantages: Less effort when opening and closing. Compared with the shut-off valve, because whether it is open or closed, the movement direction of the gate is perpendicular to the flow direction of the medium.
Disadvantages: It is easy to cause erosion and scratches between the sealing surfaces, and it is difficult to maintain the control. The external dimensions are large, and a certain space is required for opening, and the opening and closing time is long. The layout is more complicated.
The advantages and disadvantages of the above analysis are not complete, and the angle of analysis is the installation of the valve at the connection between the magnetic flap level gauge and the tank flange. If you need to inquire about the advantages and disadvantages of the three kinds of valves, you can go to a professional valve The manufacturer asked.
3. Globe valve
Shut-off valves, also known as gate valves, are forced-sealed valves, so when the valve is closed, pressure must be applied to the clapper to force the sealing surface to not leak. When the medium enters the valve from below the valve flap, the resistance required for the operating force to surrender is the friction force between the stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the stem The diameter should be large, otherwise the failure to bend the valve stem will occur. According to the connection method, it is divided into three types: flange connection, screw connection and welding connection. When the pressure is high, the sewage valve provided in the body of the magnetic flap liquid level gauge will be replaced with a high-pressure sewage valve connected by a screw, and the flanged stop valve is connected to the flange interface of the tank. The layout of the globe valve is simpler than the gate valve, which is more convenient to manufacture and maintain, the fluid resistance is large, and the force required for opening and closing is larger, which is not as good as the ball valve.
Under normal circumstances, the installation of the valve at the connection between the magnetic flap level gauge and the flange of the tank is a ball valve or a globe valve. From the perspective of the above analysis, in order to ensure that the shutdown is rapid and tight when a problem occurs, the general selection It can quickly close and close the ball valve with good tightness, and most of the selected ball valves have more control. However, this kind of selection experience ordinary field users have more accuracy in selection, and the field users can usually choose what kind of valve according to the actual needs and working conditions.
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Manager Wu of Jiangsu Anliang Instrument Co., Ltd.
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