Knowing what makes a valve the right choice-

Valves control gas and liquid flow in almost every process and system. As common as they are, choosing the right valve can sometimes be time consuming and confusing.

Begin valve selection by first gathering some basic information on system performance requirements. Knowing this will make it easier to find the right valve. The five tips in this article focus on how to match valve features with these requirements.

        Tip 1 – Valve size and type
         Choose the right valve type. Every valve needs to perform one or more basic functions:

• Shut off flow
• Divert flow
• Mix flow
• Pressure relief
• Backflow prevention
• Adjust flow

• Function determines the design of standard valve types. 

  Properly sizing the valve is also important. The right valve choice means matching the valve’s size to expected flow through the system.

• Tip 2 – Materials of construction
  Know the chemical compatibility requirements. The valve materials need to be compatible with the gases or liquids flowing through it. Plastic valves usually resist harsh or corrosive chemicals better than metal valves.

• Tip 3 – Performance requirements
  Determine the pressure and temperature requirements. Find out both the temperature and pressure ranges where the valve will be installed. Metal valves tend to withstand higher temperatures and pressures than plastic valves. Metal valves are also usually best for pressurized gases. This is because they tend to be stronger than plastic valves.

• Tip 4 – Check valves have special requirements
  Be sure the new check valve will work as expected. Look at the response time needed as well as the cracking pressure required to open the valve.

  Another consideration is normally closed vs normally open. There are basic check valve designs that require positive downstream pressure to open. These are usually referred to as normally closed check valves. There are other designs that require a positive backpressure to close. These are usually called normally open check valves. An appropriate choice between these two can improve check valve reliability. It is usually best to base this decision on whether the valve is usually open more or usually closed more during normal system operation.

  Some check valve types may not work properly if mounted vertically instead of horizontally. Flow direction (upwards vs downwards) and fluid density both matter for check valve designs that can be mounted vertically.

• Tip 5 –Maintenance
  Don't forget to consider ongoing maintenance. Any valve choice should include attention to maintenance requirements. This is important for both valve reliability and application stability.

  A good example of this are ball valves. They resist clogging, jamming or malfunctioning. But they are not suitable for adjusting flow. Using them to control flow can lead to leaking or premature failure.

  Valve connection type affects the ease and speed of repair or replacement. Each connection type (threaded, barbed, push-in, Luer, and so on) has its pros and cons. For Source Info, Click here!

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