Study on Valve-Closure Water Hammer in Gravity Pressured Water-Delivery System with Branch Line

2013 ◽  
Vol 777 ◽  
pp. 341-346
Author(s):  
Ru Dong
Keyword(s):  
Delivery System ◽  
Water Hammer ◽  
Gravity Flow ◽  
Stable Operation ◽  
Valve Closure ◽  
Water Delivery ◽  
Security Measures ◽  
Pressurized Water ◽  
Branch Line ◽  
Practical Engineering

This paper analyzed the characteristics of valve-closure water hammer rising pressure, according to the basic theory of water hammer rising pressure in the gravity flow water-delivery system. It is indicated that the end valve-closure is the main cause of water hammer, and which is an important problem of influencing the safety and stable operation of the system. Combined With an engineering example that is a gravity pressurized water delivery system with the branch line, the paper studied water hammer rising pressure when the various combinations of valve-closure duration and angle . See that off valve water hammer boost of the branch line gravity flow system is more significant, more dangerous, so we recommend that reliable and effective security measures of practical engineering must be taken.

scholarly journals Numerical Simulation of Flow Field of DN2400 Hedge Dissipator

2018 ◽  
Vol 246 ◽  
pp. 01117
Author(s):  
Huipan Tan ◽  
Jianghe Sun ◽  
Zhifang Liao ◽  
Baiyun Zhang ◽  
Zherun Tang ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Flow Field ◽  
Delivery System ◽  
Internal Flow ◽  
Stable Operation ◽  
Water Delivery ◽  
Long Distance ◽  
Water Separation ◽  
Energy Dissipator ◽  
Accident Conditions

The distribution of water resources in China is uneven. Long distance water conveyance projects have effectively solved this problem. In the water delivery system, the energy dissipator plays an important role in pressure regulation and regulation. Therefore, the design and structure of the energy dissipator affect the working efficiency and stable operation of the whole water delivery system, and it is of great significance to study the internal flow field of the energy dissipator. Based on a emergency project, this paper studies the internal flow field of the energy dissipation valve in A location and B location in the design conditions, accident conditions and water separation conditions to verify the DN2400 hedging energy dissipation. The rationality of the structural design of the device provides a reference for the design and improvement of the energy dissipator in the future.

Maximum Pressure Head Due to Linear Valve Closure

1991 ◽  
Vol 113 (4) ◽  
pp. 643-647 ◽  
Author(s):  
Chyr Pyng Liou
Keyword(s):  
Flow Characteristic ◽  
Pressure Head ◽  
Head Loss ◽  
Water Hammer ◽  
Point Of View ◽  
Global Perspective ◽  
Maximum Pressure ◽  
Valve Closure ◽  
Subtle Effect ◽  
Dimensionless Variables

The maximum pressure head resulting from one-speed closure of wide open valves is investigated. The dimensionless variables formulated in this study make the subtle effect of the initial valve head loss explicit and separate from that of the pipe frictional head loss. The maximum head is related to initial pipe frictional head loss, the initial valve head loss, the inherent flow characteristic of the valve, and the closure period by plots of dimensionless variables. The trends of the variation of the maximum pressure head are discussed. An example is used to illustrate the usage of the plots, and to show the advantage of having a global perspective of the phenomenon in the selection and sizing of valves from the water hammer point of view.

scholarly journals A novel water delivery system for administering volatile chemicals while minimizing chemical waste in rodent toxicity studies

2010 ◽  
Vol 44 (1) ◽  
pp. 66-68 ◽  
Author(s):  
A Mcdonald ◽  
P Killough ◽  
E Puckett ◽  
D S Best ◽  
J E Simmons ◽  
...  
Keyword(s):  
Delivery System ◽  
Water Delivery ◽  
Chemical Waste ◽  
Volatile Chemicals ◽  
Toxicity Studies

The Sensitivity of Counterweighted Swing Check Valve Performance to Counterweight Location

2003 ◽  
Author(s):  
L. I. Ezekoye
Keyword(s):  
Flow Resistance ◽  
Reverse Flow ◽  
Check Valve ◽  
Fast Response ◽  
Water Hammer ◽  
Flow Reversal ◽  
Reverse Direction ◽  
Valve Closure ◽  
Forward Flow ◽  
Opening And Closing

Check valves are used to minimize flow reversal. In general, the two primary design objectives of installing a check valve in a system include quick opening in forward flow and fast closure in reverse flow. The fast response requirements in both opening and closing directions are challenging. In the opening direction, the concern is to minimize forward flow resistance and, in the reverse direction, the objective is to minimize flow reversal and avoid water hammer. Check valve manufacturers have often used counterweights to permit quick opening or quick closing. The drawback of forward flow counterweight check valves is that in the flow reverse direction, the counterweights may retard valve closure. The location of the counterweight could further complicate the performance of the check valve. Misaligning the counterweight can also affect check valve performance. The use of quick closing counterweights present similar challenges. This paper examines the interaction of counterweight location and alignment on the performance of check valves.

scholarly journals Experimental Study of the Effectiveness of a Combined Closure of the End Gate Pipeline Valve

2019 ◽  
Vol 66 (1-2) ◽  
pp. 3-13
Author(s):  
Henrikh H. Herasymov ◽  
Ievgenii G. Gerasimov ◽  
Sergiy Y. Ivanov ◽  
Oleg L. Pinchuk
Keyword(s):  
Experimental Data ◽  
Gate Valve ◽  
Break Point ◽  
Water Hammer ◽  
Valve Closure ◽  
Hydraulic Shock ◽  
Reliable Operation ◽  
Irrigation Systems ◽  
Pipeline Valve ◽  
Pressure Pipeline

Abstract One of the ways to ensure a reliable operation of irrigation systems is to protect them from water hammer (hydraulic shock) damage that occurs when starting or stopping a pumping station. This can be achieved by creating conditions in which a water hammer will not occur in the pressure pipeline as a result of closing the end gate valve (EGV). The aim of the present study was to investigate processes occurring in the pipeline during a linear closure of the EGV, during a closure with one break point and during an intermittent closure, as well as to verify the effectiveness of a combined end gate valve closure of the pipeline. Based on experimental data and calculations, the article recommends a linear closure of the EGV with one break point.

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