You should begin valve selection by gathering some basic information about the system performance requirements. By understanding this, it will be easier to get the right valve. The article below explains some tips you can use to buy valves that have features that align with these requirements.
First of all, check the size and type of valve. You should select the right valve type. Each valve ought to perform one or more basic functions that include pressure relief, adjust the flow, backflow prevention, mix flow, shut off the flow, and divert flow. There are many types of valves, for example, check valves, ball valves, needle valves, metering valves, toggle valves, stopcocks, regulators, pinch valves and relief valves; function determines the design of valve types. It is essential to know the correct size of the valve. To choose the right valve, you should match the size of the valve to the flow you expect them to hold.
Secondly, put materials of construction into consideration. You should know the chemical compatibility needs. The valve materials have to be compatible with the liquids or gasses flowing through it. 316 stainless steel offers great corrosion resistance but costs a lot. Brass or bronze are decently corrosion resistant, cost less and are easier to source hence can be replaced whenever you need. Ductile iron can absorb shock in your system from different pressure levels but it is vulnerable to corrosion. Inconel is good for withstanding fluids that are hot and corrosive. Monel, an alloy of nickel and copper resists corrosion well and is good for valve trim cladding. Plastic valves resist harsh chemicals better than metal but can break easily.
Thirdly, put into account performance requirements. You need to determine the temperature and pressure requirements. Find out the ranges of pressure and temperature of where you intend to install the valves. Metal valves withstand higher pressures and temperatures compared to plastic valves. Also, metal valves are great for pressurized gases since they are stronger compared to plastic valves.
Next, you should factor in special requirements. Ensure the new valve will work as needed. Factor in the response time needed and the tracking pressure needed to open the valve. Choose between closed and open valves. There are basic valves that need positive downstream pressure in order to open. Others require positive backpressure in order to close. Appropriate selection between the two can enhance valve reliability. You should base this decision on whether your system usually needs a valve to open or close. Some valves may fail to work well if mounted vertically. Flow direction and fluid density matter for valve designs that can be attached vertically.
Finally, consider maintenance. Do not forget to look into ongoing maintenance. Any valve includes attention to maintenance needs due to application stability and reliability. For example, ball valves resist malfunctioning, clogging or jamming but are unsuitable for adjusting flow. Using them for flow control can lead to premature failure of leaking. Valve connection types influence the speed and ease of repair or replacement.