What is Water Hammer? | DFT Inc.

water hammer is a shockwave transmitted through fluid contained in a piping system it occurs when fluid in motion is suddenly forced to stop moving and frequently occurs at pump shutdown will be showing the difference between using a swing check valve and a spring assisted DFT silent check valve here you can see the fluid flow upon pumps tied up the motion and slamming of the swing check can cause damage to ceiling surfaces and fatigue and wear to the hinge pins when the pump shuts down it is gravity and reverse flow that closes or it slams the swing check valve closed resulting in pressure wave build and water hammer water hammer can also damage pipe angers instrumentation and lead to dangerous work environments now you see an Excalibur modeled VFT spring-assisted silent check valve on pump startup when the pump shuts down the spring-assisted silent check valve closes the head of reverse flow before fluid momentum changes direction thereby significantly reducing water hammer pressure spikes are minimal because the disc closes ahead of the reverse flow now you see a side-by-side comparison of DFT silent check valve and a swing check University and independent laboratory studies have shown that the dynamic characteristic of the axial flow spring-assisted silent check valve DFT check valves favours fast closing ahead of reverse flow therefore reducing pressure spikes and water hammer specified DST check valve to replace your unreliable high-maintenance wing jack or double door check valve and to significantly reduce water hammer problems visit us online at DFT - valves calm to view our complete selection of inline nozzle style non slam check valves

Channel: DFT Inc. - Check & Control Valve Manufacturer

Views: 254,097

Rating: 4.7898989 out of 5

Keywords: dft valves, check valve, check valves, water hammer, swing check valve, silent check valve, control valve, control valves, piping system

Id: 6ydsAIHWVNM

Length: 2min 39sec (159 seconds)

Published: Fri Apr 14 2017