Parker Hannifin





Whether it’s chess or hydraulic systems, each piece has its purpose.
Check valves play a pivotal role in protecting your equipment and maintaining optimal efficiency. When it comes to controlling the direction of flow and maintaining system pressure, check valves do the job.

Choosing the right check valve for your application takes forethought and strategy because there are no simple, one-size-fits-all solutions. Parker works with customers to understand their application requirements and help find a winning solution.

Engine manufacturers are using Parker check valves to control the amount of fuel delivered to the engine. That’s important because fuel regulation is critical in a fuel delivery system. The system could fail or run inefficiently if too much or too little fuel gets through. Our check valves acting as fuel pressure regulators have also been helpful to OEMs attempting to meet Tier 4 compliance - the most recent engine emissions standard implemented by the Environmental Protection Agency.
Don’t sacrifice quality, dependability, and success by making the wrong move. Choose Parker check valves. Checkmate.

What is a Check Valve?

  • A fitting which incorporates a valve that controls flow in a single direction.
  • Check valves are unseen and undervalued. These valves are 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. 
  • Check valves keep the fluids flowing in the desired direction to prevent damaging flow or pressure in the reverse direction. They can also be used in applications to maintain a system pressure for optimum system readiness and performance.
  • Surprisingly, for a valve that performs such a critical function, a check valve incorporates very few components—the body, poppet, spring and retainer.

Check valves keep fluids flowing and help maintain system pressure

Check Valve Definitions

  • Cracking Pressure: Pressure at which the poppet opens allowing flow through the check valve.
  • Pressure Drop: The internal components of a check valve restrict the flow and create a pressure drop across it.
  • Orifice: This is a precise hole drilled in the poppet allowing for limited flow (sometimes referred to as a standby flow) in the closed position.
  • Internal Leakage: The acceptable amount of fluid that passes across the check valve in the closed condition.

Parker's check valves are available in various sizes, pressure ratings, flow capacities, and crack pressures to meet the requirements of most hydraulic system applications.
This series cover the widest variety of applications out there. These hard seat check valves are offered in sizes from ¼" to 1-1/4" with the added benefit and convenience of compact design. Select sizes are also available in 45°, 90°, and tee shape fittings, which can help optimize system design by reducing labor and leak points. If you are unsure where to start looking for check valves, the DT Series is a great first option.
A hard seat check valve option for your application. Built using a rugged, two-piece modular design, CV Series results in less pressure drop for increased performance in critical applications.
A soft seat check valve option for your application. The CPIFF valve’s poppet is streamlined with minimum restriction of flow in one direction. Flow is blocked in the reverse direction as the soft seat creates a leak free seal in the closed position.
Parker maintains a large inventory of check valves in standard configurations for mobile agricultural and construction equipment that can be reviewed online.

© Parker Hannifin Corporation