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SMC > Check Valves
Check Valves

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Check Valves

  Selection Guide  

Check Valves by SMC Pneumatics

SMC offers you top quality check valves, which are a critical component of pneumatic operating systems.

Check valves are a key part of pneumatic control circuits. Sometimes, you’ll hear these units referred to as “non-return valves” because they allow media to flow in only one direction. They perform the same type of function that diodes perform in electrical circuits.

This is a guide from SMC Pneumatics to helping you choose the ideal equipment for your operation.

Integral Fitting Check Valves: Compact, Easy-To-Use Fitting System

This is compact check valve is super light and delivers one-touch fitting performance. All you have to do is push your tubing into the fitting and your non-return valve is ready for action right away. The fitting and check valve are both rated only for compressed air. The pressure range is:

  • -14.5psi to 145psi

This is the check valve you need if your operations happen in conditions that tend to be pretty harsh because of its sturdy Delrin body. Beyond its strength and efficacy, this valve is unbelievably affordable, with prices starting below $8.00. Find integral fitting check valve sizes in:

  • 4mm
  • 6mm
  • 8mm
  • ¼”
  • ?”

Applicable tube materials:

  • Nylon
  • Soft nylon
  • Polyurethane

Proof pressure: 1.5MPa, (217.5psi.)

Cracking pressure: 0.005MPa, (0.7psi.)

NAK Series Metal Check Valve: Durable Pneumatic Parts & Equipment

This metal check valve a super simple, durable choice for your all your valve needs. Here are the key specifications to know:

  • 217 psi proof pressure
  • 3 psi cracking pressure
  • 145 psi maximum operating pressure
  • -5° to 60°C (No freezing) ambient and fluid temperature
  • Intended fluid: air

This affordable valve comes in five different sizes. It’s a highly durable and efficient solution for your pneumatic operations.

New AKM Series Check Valves: Perfect For Blocking Air From Unlubricated Lines

This AKM series check valve is meant for use between a regulator and a lubricator to offer a supply of unlubricated air. The check valve prevents any lubricated air from entering unlubricated lines.

SMC’s new AC series of modular type FRL comes in four different sizes. This is totally interchangeable with the existing Modular style AC line. The bowl and element on the AW and AF series is now a single piece, which makes it far easier to replace this element. Even better, the design has cut the needed maintenance space by as much as 46% depending on the size of the body. We’ve covered the bowls on size 30 or more with a see-through bowl guard, which shields it from the environment and makes it visible from any angle for easy assessment, replacement, and monitoring. This is one of the easiest pieces to put into place for preventing the backflow of lubricant when guiding and redirecting airflow.

PLEASE NOTE: These are non-threaded valves. They are only for use with FRL units. For more information, check out our product specs to learn more.

This element offers numerous benefits, including:

  • Super easy manual replacements
  • A 50% increase in pressure drop
  • 35 mm reduction in size
  • Lighter weight
  • Resistance to metal-related corrosion

…and more.

SMC Older Model: AKM Series Check Valves

The AKM series check valve has a port for immediate air release. It’s super simple to install this to stop backflow of lubricant when redirecting air flow. Like the piece above this piece typically sits between a regulator and a lubricator to offer an unlubricated air flow, and keep lubricated air from getting into unlubed lines.

SMC Clears Up Common Misunderstandings About Check Valves

Sometimes, people think of check valves as obstacles that should be re-piped around or equipment that simply does not work. This can lead to mistaken decisions to not replace the part, or pipe around it when it fails. These are among the few automated valves, which is really important because you need valves that stop backflow even in the event of electrical power outages.

That’s why SMC Pneumatics supplies these valves for use in:

  • Sump systems
  • Cooling towers
  • Sewage systems
  • Pressure pumps
  • Wash-down stations
  • Injection lines
  • Vacuum breakers
  • Steam lines

…and far too many more to create a complete list.

How Check Valves Operate

Check valves are sensitive to the fluid flowing around them. They depend on the line fluid to open and close. The disc on the inside allows flow to run forward, which causes the valve to open. This reliance on back pressure from the fluid is what makes the valve continue to operate even if the valve is closed. Once this forward flow is reduced or moves in the opposite direction, the disc closes by design. Assembly is typically a simple process involving only a few components such as the body, seat, disc, and cover. Different designs incorporate other elements, possibly a stem, hinge, pin, disc arm, spring, ball, elastomers, and bearings.

SMC Pneumatics Helps You Trouble Shoot Your Check Valves

Feel free to contact us if you have any questions about check valve replacement. However, as a broad guide: we offer the following recommendations when looking at a check valve you’re thinking about replacing:

Ask yourself:

  • What is the real problem?
  • What do I want to accomplish through replacing this valve?

There are a wide variety of potential problems with check valves that may require replacement. Reverse flow and water hammer are two of the most common problems. Typically, both of these would be solved with a faster close time, which means that an upgraded model would be in order. It is far better than risking the dangers of backflow, which can often mean hazardous risks of one kind or another, or damage to the surrounding area and equipment. The cost of this risk and damage is higher than that of a high-quality check valve just about every time.

Get More Expert Help With Check Valves
SMC Pneumatics takes pride in delivering reliable, top quality pneumatic equipment of all kinds. Check valves are a critical component of pneumatics systems, and there is too much risk involved in not ensuring proper performance. Contact SMC Pneumatics for more advice and guidance about check valves.