In practically every process and system, the flow of gas and liquid is controlled by a valve. Despite its prevalence, selecting the appropriate valve may be a time-consuming and mind-boggling endeavour at times. To get started with selecting valves, you need first to obtain some basic information on the system’s performance requirements. Having this information will make it much simpler to locate the correct valve. Pick the proper kind of valve to use. Every valve should be able to execute at least one of these three fundamental functions: block flow, redirect flow, and mix flow.
Pressure relief, avoidance of backflow, and flow adjustment are all included. The valve’s function determines the design of typical valve types. Check valves, ball valves, needle valves, metering valves, and toggle valves are some of the most frequent kinds of valves. In addition to this, the valve must be of the proper size. Choosing the appropriate valve entails matching the size of the valve to the amount of flow anticipated through the system.
Be familiar with the standards for chemical compatibility. The materials that make up the valve should be suitable for use with the fluids or gases that pass through it. In most cases, plastic valves are better equipped to withstand the damaging effects of solid or corrosive substances than metal valves.
Determine the temperature and pressure levels that will be present in the area where the valve will be placed. Plastic valves have a lower capacity to endure high temperatures and pressures than metal valves. Metal valves are often considered to be the superior choice for use with pressured gases. It is because metal valves are often more durable than plastic valves.
Check that the newly installed check valve will perform as required. Examine the necessary reaction time and the cracking pressure that must be met before the valve may be opened. Another thing to consider is whether the switch is generally open or normally closed. There are various fundamental designs for checking valves, and one of them requires a positive pressure downstream to open. The common name for these types of check valves is typically closed check valves. There are several designs available that must have positive backpressure to shut. Check valves of this kind are often referred to as ordinarily open check valves. The dependability of the check valve may be improved by making a suitable decision between these two options. When making this selection, it is often advisable to base it on whether the valve usually is open more or closed more during the regular functioning of the system. If the check valve is installed vertically rather than horizontally, it may not function correctly. When designing check valves that may be positioned vertically, it is essential to consider both the flow direction (upwards or downwards) and the fluid density.
It is important to remember to factor in continuing maintenance. Any choice of the valve should involve consideration of the necessary maintenance procedures. It is critical for the valve’s dependability and the application’s stability. Ball valves are a great illustration of this concept. They are not susceptible to clogging, jamming, or other malfunctions. However, they are not suited for controlling the flow of water. If you use them to manage the flow, you risk causing leaks or bringing on premature failure. The kind of connection on a valve may determine how quickly and easily it can be repaired or replaced.
When going into the process with specific prior knowledge, one may more quickly and confidently choose the appropriate valves. There will always be obstacles, such as requirements for the application, operating circumstances, and chemical compatibility. Beginning with the most fundamental valve needs will make the selection process easier and more efficient.