Wafer check valve- Duralble plates check valve, also known as reverse flow valve, non-return valve, back pressure valve, one-way valve, is an automatic valve. Its main function is to automatically open and close by the force generated by the flow of the medium in the pipeline to prevent the medium from flowing back, the pump and the drive motor from reversing, and the container medium from leaking. The following is a detailed introduction to the wafer check valve:
1. Basic definition of WIVO WAFER CHECK VALVE
Type: automatic valve
Alias: reverse flow valve, non-return valve, back pressure valve, one-way valve
Working principle: automatically open and close by the force generated by the flow of the medium in the pipeline
2. Function and application of WIVO WAFER CHECK VALVE
Main function: prevent the medium from flowing back, prevent the pump and the drive motor from reversing, and the container medium from leaking.
Application scenario: suitable for pipelines with various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc. At the same time, it can also be used to provide supply to the auxiliary system where the pressure may rise to exceed the main system pressure.
3. Structure and classification of WIVO WAFER CHECK VALVE
Structure: Wafer check valve is mainly composed of valve body, valve disc, valve seat and other components. According to different structures, it can be divided into swing check valve and lift check valve.
Swing check valve: the valve disc rotates around the axis. When the fluid flows in the opposite direction, the valve disc closes under the action of fluid pressure and its own gravity.
Lift check valve: the valve disc moves along the axis. When the fluid flows in the opposite direction, the valve disc falls back to the valve seat under the fluid pressure and closes.
Classification: mainly classified according to the opening method of the valve disc, including swing type and lift type.
4. Technical parameters of WIVO WAFER CHECK VALVE
Nominal pressure: PN1.0-16.0MPa, there are also ANSI CLASS 150-900, JIS10-20K and other standards.
Nominal diameter: DN15~900, NPS 1/4~36.
Connection method: flange, butt welding, thread, socket welding, etc.
Applicable temperature: -196℃~540℃.
Valve body material: including WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti and other materials to adapt to different media and use environments.
5. Working characteristics of WIVO WAFER CHECK VALVE
Large load changes: During the operation of the check valve, the load changes greatly, but the opening and closing frequency is relatively small.
Water hammer phenomenon: At the moment when the check valve is closed, due to the change in the flow direction of the medium, water hammer phenomenon may occur, causing impact on the pipeline system. Therefore, measures need to be taken in the design to reduce the impact force of water hammer.
Dynamic characteristics: The dynamic characteristics of the check valve have an important influence on its working performance. For example, the opening and closing process of the valve disc is affected by the transient flow state of the system, and the closing characteristics of the valve disc also have an effect on the flow state of the fluid.
6. Optimization and improvement of WIVO WAFER CHECK VALVE
In order to improve the working performance and service life of the clamp check valve, many new technologies and new materials have been adopted in the design and manufacturing process in recent years. For example, the energy loss of the medium passing through the valve can be reduced by optimizing the flow guide structure; the flow rate increment during the check valve slow closing process can be reduced by using a buffer cylinder, thereby reducing the water hammer phenomenon.
In general, as an important component in the pipeline system, the wafer check valve plays an important role in preventing the medium from flowing back and protecting pipeline machinery and equipment. With the continuous advancement of technology and the continuous innovation of materials, the performance and service life of the wafer check valve will be further improved.
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