Check Valve Water Hammer Protection
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The document discusses check valves and their importance in preventing water hammer. It describes how traditional swing check valves can cause water hammer due to their slow closing speed. DFT in-line check valves are presented as an alternative that closes more quickly, reducing water hammer. Test results show water hammer was eliminated after installing a DFT silent check valve on a pump. The conclusion emphasizes the importance of carefully selecting check valves to have a cost effective and maintenance-free system.
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Check Valve Water Hammer Protection
- 1. GOODBYE Water Hammer, Presented by: John Anderson HELLO PUMP PROTECTION!
- 2. AGENDA aCheck Valve overview aCheck Valves and their relation to flow aSizing Check Valves Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE aReverse flow and Water Hammer aDFT Check Valves – Model overview aExamples of Check Valves at work in the field
- 3. aOne way flow aPrevent reverse flow aNot one type for all applications BASIC PURPOSE Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 4. IDEAL OPERATION aAlways fully open aDisc at stop aNo fluttering aSized for the application, not the pipe size Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 5. Regardless of type or style of valve, the longest trouble-free service will come from valves sized for the application, not the line size, whereby the disc is stable against the internal stop in the open position. SIZED FOR APPLICTION Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 6. SIZE MATTERS A properly sized check valve will: a Make a system reliable a Increases the lifespan of the system a Eliminate disc fluttering a Contribute to overall cost savings Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 7. CHECK VALVE CONSIDERATIONS a Self-acting - No outside means like On/Off a Flow sensitive - Rely on line fluid to make it work (open or close) a Check Valves are FLOW ACTUATED CONTROL VALVES a Most designed for Horizontal Installation Only! Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 8. TYPES – Pros & Cons aSimple design aHigh Cv (full port) aEasy repair Swing Check API 600 aB16.10 F to F aSlow closing – long travel aWater hammer aHorizontal orientation aLoose part/break off Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 9. SWING CHECK Curve showing typical flow reversal characteristics after swing check closes FORWARD FLOW VELOCITY REVERSE FLOW VELOCITY TIME Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 10. TYPES – Double Doors Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 11. DFT In-Line Check Valves ® a Disc travels in-line with flow Due to spring assist & short travel, by the time the forward velocity has decreased to zero, the valve disc has reached the seat and the valve is closed a Travel Short: ¼” per 1” of line size i.e.: 10”=2.5” travel, 8”=2” travel Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 13. DFT In-Line Check Valves ® a Designed to prevent water hammer a Cracks open at 0.5 psi Horizontal a Max flow at 1.0 psi differential pressure a Installed in any position Vertical up Vertical down (with modification) Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 14. DFT In-Line Check Valves ® a Centre guided flanged wafer a Body guided threaded a Dual guided stem flanged/wafer a Custom sizing a Soft seat option for bubble tight closure a NACE trims and low temp availability Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 16. DFT In-Line Check Valves ® a Critical Service Applications Prevent water hammer Reverse flow protection Protects pumps from spinning backwards Prevents parts downstream Insure long life is custom sized a Control valve of check valves Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 17. Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 18. DFT Excalibur® a ASME B16.10 F-F a Available in Flanged or Butt Weld ® a 2” to 24” Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 19. DFT GLC® a 1” to 24” a Short pattern a ANSI 150 to 1500 a WCB, 316 & other a 316SS trim a RF, RTJ a One piece body ® Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 20. DFT PDC® ® a 2” to 12” a ASME F to F (B16.10) a Pulse damped design a Designed for reciprocating compressor discharge only a ANSI 150 to 1500 Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 21. DFT WLC® ® a Wafer body a API 594 - CI 600+ a Ideal for pump discharge Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 22. DFT TLW® ® Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE a API 594 Face to Face a Threaded Lug Design a RF Wafer Ends a 2-24” a No exposed Bolts Tapped Lug Wafer
- 23. DFT ALC® ® a 2” to 24” a #150 & #300 a API 594 face to face Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 24. DFT Basic Check® a 1/4” to 2-1/2” a 450 to 6000 CWP a Threaded ends a SS construction a Threads into a forged steel, reducing coupling Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 25. DFT SCV® ® a 750 & 3600 CWP a NPT & SW ends a 316SS a X-750 spring a NACE MR-01-75 Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 26. DFT Basic Check Vacuum Breaker ® ® Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE a 1-4” – Nominal size a Protects against collapse of Pressure Vessels, Tanks and Pipe
- 27. DFT Y-Calibur® ® Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE a 4-14”– #600-2500 a Pressure Seal Bonnet a In-line Repairable a Butt weld ends a Horizontal or Vertical installation
- 28. WATER HAMMER a The generation and effect of high pressure shock waves (transients) & column separations in relatively incompressible fluids (i.e. liquids – water) when it is stopped abruptly by an object such as a valve disc. a Symptoms Noise Vibration Ruptured Piping Equipment Damage Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 29. Pressure (Max) = interrupted velocity X 58 psi (fps) a These high pressure waves act against the piping and the valve, exerting high forces a IE Line carrying fluid at 25’/sec velocity will have an instantaneous increase of 1450 psi under rapid closure (over 25 fps is considered fast) a 25’x58=1450+operating pressure a 25’ fps ANSI 150=285+1450=1735 psi ANSI 300=720+1450=2170 psi ANSI 600=1500+1450=2950 psi a If the system is not designed to withstand these high transient forces, pipe could rupture or cause damage to pumps and valves Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 30. Pressure (Max) = interrupted velocity X 58 psi (fps) Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 31. PUMP INSTALLATION TEST (SWING CHECK) Strip recording of Water Hammer
- 32. RESULTS Strip recording of Water Hammer after installation of Silent Check Valve
- 33. SUMMARY History shows us that check valves are the most problematic pipe equipment installed Designers should consider spending more time in looking at their check valve selection criteria in order to have the most cost effective and maintenance free valve installed. Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
- 34. Questions www.trianglefluid.com/documentation 613-968-1100 1-866-537-1133 john@trianglefluid.com Phone: 613.968.1100 │ Toll-Free: 1.866.537.1133 │Fax: 613.968.1099 │399 College St. E., Belleville, ON K8N 5S7 │www.trianglefluid.com SERVICE │ QUALITY │ PERFORMANCE
Editor's Notes
- DFT In-line Check Valves History: DFT in-line check valves began over 70 years ago with a customer’s need for a small metal-seated check valve that could be installed in any position while providing tight shutoff. Objective: DFT’s objective is to diagnose check valve problems, provide solutions and prevent failures. Experience: DFT has learned by listening to customers like you that each industry has special needs that can exceed other check valve designs. Features: We specialize in providing in-line check valves that meet customer requirements as opposed to simply meeting line size. That’s why DFT non-slam check valves are known around the world as the valve to use to prevent or eliminate water hammer problems. Selection: Whatever your size, pressure or piping configurations, DFT has a check valve for you. Let’s look at a few right now!
- For more information on Check Valve Sizing and Selection: Download DFT In-Line Check Valve Catalogue at: www.trianglefluid.com/documentation Consult with the experts at Triangle Fluid Controls to choose the optimal check valve for your applications.