An Experimental Study to Predict Dynamic Performance of Check Valve by Water Hammer

2019 ◽  
Vol 19 (1) ◽  
pp. 1-12
Author(s):  
Tae-Kook Park ◽  
Yong-Bum Lee ◽  
Jae-Hyeong Kim ◽  
Ki-Chun Lee ◽  
Dong-Cheon Baek
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Check Valve ◽  
Water Hammer

Theoretical and Experimental Study on Optimum Design of Gear Profile Modification Curves

2004 ◽  
Vol 471-472 ◽  
pp. 269-272
Author(s):  
Sheng Sheng Zhang ◽  
J.Z. Zheng ◽  
L. Cheng
Keyword(s):  
Experimental Study ◽  
Working Condition ◽  
Dynamic Performance ◽  
Gear Transmission ◽  
Important Method ◽  
Profile Modification ◽  
Gear Transmission System ◽  
System Vibration ◽  
Gear Profile ◽  
Specific Working

Gear profile modification is an important method for reducing system vibration and noise of a gear transmission. In this paper, three kinds of gear profile modification curves are studied, and relevant experiments are conducted. Some useful conclusions based on the theoretical analysis and experimental results have been obtained. Line, parabola and sinusoid modification curves are very useful in improving the dynamic performance of a gear transmission system by reducing system vibration and noise. In order to design the optimal tooth profile modification curve, the curve type must be decided firstly according to the specific working condition, and the curve parameters can be determined by means of optimum programming.

Water hammer analysis when switching of parallel pumps based on contra-motion check valve

2020 ◽  
Vol 139 ◽  
pp. 107275 ◽  
Author(s):  
Zhida Yang ◽  
Longyu Zhou ◽  
Haoming Dou ◽  
Chuan Lu ◽  
Xiuchun Luan
Keyword(s):  
Check Valve ◽  
Water Hammer

Full-scale experimental study of the dynamic performance of buried drainage pipes under polymer grouting trenchless rehabilitation

2019 ◽  
Vol 181 ◽  
pp. 121-133 ◽  
Author(s):  
Ren Wang ◽  
Fuming Wang ◽  
Jianguo Xu ◽  
Yanhui Zhong ◽  
Shikun Li
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Full Scale

Experiment on Water Hammer Protection Performances of the Shuttle Check Valve in Multi-Pump Parallel Connection System

2012 ◽  
Vol 192 ◽  
pp. 37-41 ◽  
Author(s):  
Hai Bo Meng ◽  
Yong Liu ◽  
Yong Li
Keyword(s):  
Check Valve ◽  
Water Hammer ◽  
Parallel Connection ◽  
Connection System ◽  
Peak Value

A suddenly pump stop in multi-pump parallel connection system could induce water hammer which may cause serious accidents. To prevent water hammer harm, comparing experiments was carried out to study the water hammer phenomenon in the lift closing check-valve adopted system and the shuttle check valve adopted system. The result indicates that, the shuttle check valve greatly cuts the peak-value produced by stop-pump water hammer impulsion, and reduces the probability of bringing a devastating water hammer accident.

Water Hammer Characteristics for Parallel Pumps Water Supply Systems

2008 ◽  
Author(s):  
Wenxi Tian ◽  
Guanghui Su ◽  
Suizheng Qiu ◽  
Gaopeng Wang ◽  
Qing Lu
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Water Supply ◽  
High Speed ◽  
Nuclear Power ◽  
Optimization Design ◽  
Check Valve ◽  
Water Hammer ◽  
Characteristic Line ◽  
Water Supply Systems

The water hammer induced by abrupt velocity change of fluid flow is inevitable for nuclear power plant systems because of the sudden opening or closing of valves, the sudden startup or shutdown of the pumps and the rupture of pipes. The water hammer pressure wave can damage the pipes and cause the abnormal shutdown of Nuclear Power Plant (NPP). The object of this study is a Parallel Pumps Water Supply system (PPWS) adopted in a NPP. The PPWS is composed of two parallel mixed-flow pumps connected with a check valve separately, a container, a throttle flap and pipe lines. The Method of Characteristic line (MOC) was adopted to evaluate the water hammer behaviors of the PPWS during the alternate startup and shutoff conditions of two parallel pumps. A code was developed using Fortran language to compute the transient behaviors including he peak pressure, the flow velocity and the movement of the valve plate. The results indicate that the water hammer behaviors under low speed startup condition differ from that of high speed startup condition. The maximum pressure vibration amplitude is up to 5.0MPa occurring under high-high speed startup condition. The computation results are instructive for the optimization design of the PPWS so as to minimize the damage potential induced by water hammer.

scholarly journals Experimental Study of Air Vessel Behavior for Energy Storage or System Protection in Water Hammer Events

Water ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 63 ◽  
Author(s):  
Mohsen Besharat ◽  
Maria Teresa Viseu ◽  
Helena Ramos
Keyword(s):  
Experimental Study ◽  
Energy Storage ◽  
Water Hammer ◽  
System Protection
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