Five Tips for Selecting the Right Valve | ISM

Choose the right valve means answering key questions first

Published: August 1,  
Last updated: December 30,  

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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. These are some of the most common valve types:

• Check valves
• Ball valves
• Needle valves
• Metering valves
• Toggle valves
• Stopcocks
• Relief valves
• Regulators
• Pinch valves

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

Common Valve Types at VMA, Valve Manufacturers Association of America

How to Select the Right Valve (with Pros and Cons) at Indelac Controls

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.

Miniature Ball Valves: Plastic, Brass or Stainless Steel? at ISM, Industrial Specialties Mfg.

Chemical Compatibility Chart at ISM, Industrial Specialties Mfg.

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.

A Selection Criterion for Pump and Valve Reliability at Processing Magazine

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.

Checking Out Check Valves &#; An Introduction at ISM, Industrial Specialties Mfg.

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.

Plant and Equipment Maintenance at HSE, Health and Safety Executive

Knowing where to start makes valve choice faster and easier
There it is. Knowing particular information beforehand, makes choosing the right valve easier and more certain. There will always be complications like application requirements, operating conditions and chemical compatibility. Starting with basic valve requirements will simplify and speed up valve selection:

• Valve size and type
• Materials of construction
• Performance requirements
• Check valve specific requirements
• Maintenance planning
   

Some additional resources 

How ISM can help you find the right miniature valve for your application
Personalized customer service and resources available at the ISM website can be a great help when selecting a valve. Available online resources include chemical compatibility reference guides, dimensional drawings and product data sheets. Our online and PDF flow control valve catalogs provide access to a wide variety of miniature valve types, connection types, materials and sizes:

Take Advantage of Our Expertise

We offer a line of ideas, so if you don't see it - ask for it. Let us turn your ideas for pneumatic or fluidic circuitry assemblies into reality &#; from conception to finished product.

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Water Hammer is a pressure shockwave that can rupture pumps and piping and cause severe damage to a piping system. It is a common issue with traditional check valves that need gravity and flow reversal to close.  

Properly sized, non-slam HDL ball check valves can minimize or even eliminate water hammer.   

HDL and ball check valves consist of just three components: body, cover and ball. The ball is the only moving part. The freely moving ball is mounted in a valve housing so that return flow is effectively prevented. The metal ball is covered with an oil, sewage and seawater resistant rubber which provides a perfect and silent seal.  

The HDL model , now AVK Series 53, is the most widely used ball check valve in municipal and industrial applications.

Available in sizes 1½&#; to 24&#;, these ductile iron and stainless steel Ball Check Valves are ideal where there is danger of water hammer or clogging, such as sewage and storm water systems.

HDL Ball Check Valve Specifications:

(in.)

(lbs)

Sinking Weight  

(lbs): 

A-040z

Flanged

15

X

1.2

A-065z

Flanged

17

X

2.3

A-080z

Flanged

27

X

3

A-100z

Flanged

40

X

6.3

A-150z

Flanged

86

X

If you are looking for more details, kindly visit Ductile Iron Ball Check Valve.

20

A-200z

Flanged

150

X

44

A-250z

Flanged

247

X

96

A-300z

Flanged

359

X

150

A-350z

Flanged

657

X

248

A-400z

Flanged

917

X

366

A-450z

Flanged

1,570

X

690

A-500z

Flanged

2,646

X

1,220

A-040z

Threaded

6.2

X

0.3

A-050z

Threaded

9.0

X

1.2

* BUNA N coating 

The basic purpose of a check valve is to permit flow in one direction, and prevent flow in the opposite direction. The simple, non-slam design of the HDL Model Ball Check Valve eliminates water hammer and offers significant advantages over traditional flap check types.

For more information, please visit DI Dismantling Joints Manufacturer.