GEFA Water Hammer GB

give a possess Technic your partner for valve technology the water hammer effect what is really happening during water hammer effect the following pictures are taken with a high-speed camera with thousand frames per second we focus on that forces that are generated when water is punching on the large water hammer effect is activated by fast closing over valve forces during water hammer effect in proper speed these effects are not visible to the naked eye the pictures of the high-speed camera show how a steam vacuum is generated how the water column is pulled back and punching on the valve consequences of water hammer effect in slow-motion you see how water spray squirts out of the flange gasket area the studs are stretched and at the same time the whole construction is spoiled with the deflection of 50 millimetres the forces vacuum is generated and pulls the water column back with a vacuum pressure of 0.1 to 0.25 the measured distance for the back flow is 30 centimeters water covers this distance within 64 frames that means in 64 milliseconds thirty centimetres comply 4.7 m/s or 17 km/h this is comparable to the speed of a cyclist now steam bubbles are decomposed and deceleration Begins for comparison the pursuit plane reaches 10 G at most in an accident deceleration is 50 G at most within eight milliseconds the speed of the water is dropping to zero and this time you cannot see any vacuum bubbles that corresponds to an acceleration of 586 litres per square seconds or 59.7 G during the deceleration there is a force of 29,000 300 Newton on the surface of 50 square centimeters this is a pressure of 50 8.6 bar the actual load on the disk is as high as if a heavy truck wagon three tons would rest on it by

Channel: GefaAnwendungen

Views: 277,888

Keywords: GEFA, Water, Hammer, GB

Id: X9UbzcanuDk

Length: 4min 18sec (258 seconds)

Published: Thu Apr 01 2010