Common Check Valve Problems and Solutions
2025-08-07
Introduction to Check Valve Performance
Check valves are essential components in piping systems that prevent backflow and protect equipment. At Hanno Valve, we engineer high-performance check valves that withstand demanding industrial applications while minimizing common failure modes. This guide examines frequent operational issues, proven solutions, and our advanced valve specifications.
5 Common Check Valve Problems & Professional Solutions
1. Water Hammer (Hydraulic Shock)
Causes:
-
Sudden disc closure creating pressure surges
-
Improper valve selection for flow conditions
Hanno Solutions:
✔ Silent check valves with spring-assisted closure
✔ Damped closing mechanisms (adjustable)
✔ Proper sizing calculations by our engineers
| Valve Type | Closing Time | Water Hammer Risk |
|---|---|---|
| Swing Check | 0.5-2 sec | High |
| Dual Plate | 0.1-0.3 sec | Medium |
| Nozzle Check | 0.05-0.1 sec | Low |
2. Disc Sticking/Seizing
Prevention Methods:
-
HV-300 series with PTFE-coated hinges
-
Stainless steel internals for corrosion resistance
-
Maintenance ports for cleaning without removal
3. Premature Wear
Material Solutions:
-
Hard-faced seats (Stellite 6 coating)
-
Integral wear plates at pivot points
-
Replaceable disc assemblies
4. Flow Reversal Issues
Technical Fixes:
-
Spring-loaded designs for vertical pipes
-
Weighted discs for low-flow conditions
-
Flow guides to stabilize disc movement
5. Leakage in Closed Position
Sealing Enhancements:
✔ Metal-to-metal seals (API 594 compliant)
✔ Resilient seats for bubble-tight shutoff
✔ Double-seal designs for critical services
Hanno Valve Check Valve Specifications
Product Line Comparison
| Series | Type | Size Range | Pressure Rating | Body Material |
|---|---|---|---|---|
| HV-100 | Swing | 2"-48" | 150#-900# | WCB, CF8M |
| HV-200 | Dual Plate | 2"-24" | 150#-2500# | LCB, Duplex |
| HV-300 | Nozzle | 1/2"-12" | 800#-4500# | F91, Inconel |
Performance Features
✔ Zero-leak certification (API 598)
✔ Cv values optimized for each design
✔ Fire-safe options available
✔ Anti-vibration locking mechanisms
Check Valve Maintenance Best Practices
Quarterly Inspection Checklist
-
Operational test - Verify full travel and closure
-
Body inspection - Check for erosion/corrosion
-
Seat examination - Confirm sealing surface integrity
-
Hinge/pivot lubrication - Use compatible grease
Annual Maintenance
-
Disc thickness measurement
-
Spring tension verification
-
Full pressure testing
FAQ: Check Valve Troubleshooting
Q: How to select the right check valve for my application?
A: Consider these key factors:
| Parameter | Swing Check | Dual Plate | Nozzle Check |
|---|---|---|---|
| Flow Rate | Medium-High | High | Very High |
| Pressure | <900# | <2500# | <4500# |
| Installation | Horizontal | Any | Vertical OK |
| Water Hammer | Not Recommended | Good | Excellent |
Hanno Valve engineers recommend:
-
Water systems: HV-100 with rubber seat
-
Oil pipelines: HV-200 with metal seal
-
Steam service: HV-300 with guided disc
Why Choose Hanno Check Valves?
✔ 50+ year design life in standard services
✔ Custom trim packages available
✔ 3D-printed prototypes for special designs
✔ Global certifications (API, ASME, PED)
Get Expert Valve Solutions Today
For technical support or emergency replacements:
📞 Tel: +86-18906880767
📧 E-mail: [email protected]
With 25 years manufacturing experience, I personally guarantee Hanno check valves deliver reliable backflow prevention in the most challenging environments. Contact us for your fluid control needs!
