Check Valve Selection Criteria

I. Overview

Check valve is a kind of automatic valve, its main function is to prevent the medium in the pipeline reverse flow. Correct selection of check valves is essential to ensure the normal operation and safety of the system. In this paper, we will introduce the check valve selection criteria in detail.

Second, the selection principle

1. according to the piping system requirements, select the appropriate type of check valve (such as rotary, lift, ball, etc.).
2. determine the nominal pressure of the check valve, nominal diameter and applicable media. 3.
3. Consider the temperature, flow rate and flow direction of the medium. 4.
4. according to the working conditions of the system, select the check valve sealing performance, closing speed and buffer performance.

Third, the main parameters

1. Nominal pressure: according to the working pressure of the piping system selection, to ensure that the check valve can withstand the higher pressure of the system.
2. nominal diameter: according to the media flow rate selection, to ensure that the flow rate to meet the system requirements.
3. applicable media: consider the nature of the medium, such as water, gas, steam, corrosive media.
4. medium temperature: according to the medium temperature selection check valve material and structure, to ensure that the valve works properly at high temperatures.
5. flow rate and flow direction: consider the flow rate and flow direction of the medium, select the appropriate type and structure of the check valve.

Fourth, the performance requirements

1. sealing performance: to ensure that the check valve can effectively prevent the leakage of media when closing.
2. closing speed: according to the actual need to choose fast closing or slow closing of the check valve.
3. buffer performance: for piping systems that may produce water hammer, select the check valve with buffer performance.
4. Wear-resistant, corrosion-resistant performance: according to the nature of the medium to choose the appropriate material to ensure the service life of the check valve.

V. Other Precautions

1. When selecting and purchasing, pay attention to the certification and standards of the check valve, such as ISO, CE, etc.
2. choose reputable manufacturers and suppliers to ensure the quality and after-sales service of check valves.
3. according to the actual project requirements, field inspection and selection calculations to ensure the accuracy of the selection.

Summary

Correct selection of check valves is essential to ensure the normal operation of the piping system. In the selection process, according to the piping system requirements, the main parameters, performance requirements and other considerations for comprehensive consideration. Following the selection criteria in this article can help you choose the right check valve to ensure the safety and stability of the system.