This video is part of our How To Series and covers installing and operating check valves.

Check valves are fittings that incorporate a valve that helps control flow in a single direction. Keeping media flowing in a desired direction helps system efficiency and prevents damaging flow and pressure in the reverse direction. Check Valves can also be used in applications to maintain a system pressure for optimum system readiness and performance. Found in just about every mobile and industrial hydraulic system on the planet. Simply put, if there’s a pump, most likely you will find a check valve.

Depending on the style of check valve, typical components include a body, poppet, spring, retainer, and, when applicable, seals/o-ring. In choosing the right product, it’s critical to follow the Stamp selection process. Each aspect of the Stamp process needs to be reviewed and information must be gathered to make sure you are selecting the correct check valve for your applications.

Once you have chosen the correct check valve, it’s important to follow installation guidelines. DO NOT apply excessive torque; it can result in cracking or splitting. Ensure the system and interface are clean of contamination and debris . For other precautionary steps, visit Parker’s safety sheet that can be reviewed in the QCD’s product catalog.

After ensuring the proper precautions are taken, you can install the check valve.
Parker's check valves are available in various materials, sizes, pressure ratings, flow capacities, and crack pressures to meet the requirements of most hydraulic system applications. Steel is the standard material but other materials such as stainless steel and brass are available. Most Parker check valves have the flow direction stamped on the product to ensure proper installation. If not, ensure the check valve is positioned to allow flow in the desired direction.

Starting in the closed position, the check valve is fully seated which prevents flow in both directions. When the desired crack pressure is reached, the check valve poppet opens allowing flow through the check valve. Parker offers a variety of crack pressures to allow the check valve to perform special circuit functions or operate under unique conditions. Be sure to consider the pressure drop implications when specifying the check valve for your application. Possibly the most important feature of the check valve is back flow prevention. If situations occur in which backflow is present, the check valve poppet will close preventing the flow from working upstream and potentially damaging expensive components in the system.

To learn more about Parker check valves and protecting your equipment, contact your Parker salesperson or reference Catalog 3800.

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As the global leader in quick connect and check valve products, Parker has solutions for almost every hydraulic application.

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Video Chapters

00:00 What is a check valve?
00:46 Components of a check valve
00:56 Choosing the right check valve for your application
01:10 Installing check valves - Check valves installation guidelines
02:03 Check valve operations
02:46 Learn more about Parker check valves


#CheckValves #HydraulicCheckValves #ParkerHannifin #PumpCheckValves #PreventHydraulicBackflow

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