Check fittings are attached correctly; confirm valve is hooked up the intended way.

About the Check Valve

• Purpose of the Check Valve: Allows flow to go in only one direction.
• How it works: Flow moving toward the ball (the catch), it'll catch. Flow moving away from the ball (around it), flow will continue.
  • Because of this, it is critical that the check valve is hooked up correctly (in the intended direction). 
• When it's used: When flow is needed only in one direction. Example: Pumps.

Common Component Failure Problems

• System is not working as expected.
  • Is the valve hooked up correctly? Are there any leaks?
    • Is the valve hooked up backwards?
    • Are hoses hooked up to the correct ports and connected to the correct components?
    • Are the hoses attached correctly?
      • If not, reattach.
    • Is there any scarring or damage on the fittings?
      • If so, replace.
  • Check pressure.
    • Is valve getting proper pressure?
    • If not, problem is likely upstream.
  • Check flow.
    • Is the flow high enough for the valve to function properly?
    • If not, problem is possibly upstream. 

Troubleshooting Instrumentation/Tools

• How to troubleshoot a hydraulic system
• Using a pressure gauge to troubleshoot a hydraulic system
• Using a flow meter to troubleshoot a hydraulic system

Troubleshooting Step-by-Step Example

Additional Troubleshooting Information

Related Parts:

• Needle Valve
  
• Flow Control Valve
  
• Pressure Compensated Needle Valve
  
• Pressure Reducing Valve
  
• Sequence Valve

Schematic: 

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