Check valve slam analysis in pumping station

Himr, Daniel; Dokoupil, Pavel

doi:10.1051/epjconf/201611402038

Cited by 6 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An example of the pressure surge due to the check valve slam after the pump stoppage is shown in the figures 1 and 2. The slam also causes strong mechanical vibrations of pipeline with acceleration about 20 G in this case [4].…”

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Experimental investigation of the check valve behaviour when the flow is reversing

2017

Self Cite

View full text Add to dashboard Cite

Abstract. Check valve in a pipeline is supposed to prevent the reverse flow and to allow the flow in the positive direction. The construction of check valves follows these requirements, but the check valve must not cause pressure pulsations in transients. It means when the fluid is accelerating or decelerating. The article describes an experimental investigation of a swing check valve when the flow is changing its direction. The check valve was placed in an experimental circuit, where the pressure on the upstream and downstream side of the valve was measured and the current value of flow rate was determined. The goal was to simulate conditions in the real system, where the check valve slam had been observed.

show abstract

Section: Introductionmentioning

confidence: 92%

“…The lower static pressure in the pipeline the greater column separation probability. The slam can lead to severe damages of the check valve and/or the whole system [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the check valve behaviour when the flow is reversing

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The dependence between flow rate Q and pressure loss Δp is the basic characteristic of the valve. This dependence is comprised of partial characteristics for the selected cone strokes of control valve, and it is determined experimentally [4,8]. The test circuit is on Fig.…”

Section: Experimental Equipmentmentioning

confidence: 99%

Physical and mathematical fundamentals of cavitation

Jablonská¹,

Kozubková²

2016

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Increasing of operating parameters when using fittings in hydraulic circuit puts high demands on their durability and reliability. Under these operating conditions, the valves are mechanically worn mainly by cavitation. Therefore, it is necessary to identify the conditions of normal operation and operation with cavitation. One way of cavitation determining in addition to the practical test is mathematical modeling. Firstly, it is necessary to specify the mathematical models and verify their correctness by verification with experiment. The detailed analysis of the results obtained in a laboratory apparatus of the water flow through the convergent-divergent nozzle of rectangular cross section and the results of modeling, it was found that the cavitation is a term containing vapour and air cavitation, while both physical processes occur simultaneously. Experience has been applied to a practical problem of water flow through control valve.

show abstract

“…Liu and Zhao (2016) studied the reverse impact of multi-stage throttling characteristics for a pilot check valve, Zhao and Liu (2018) studied the influence of reversing the impact load on the performance of a two-step unloading pilot-operated check valve. Himr et al (2016Himr et al ( , 2017 applied experimental methods to study the impact of reverse flow and transient closure characteristics of check valves.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Closing Characteristics of a Check Valve with Built-in Damping System

2021

JAFM

View full text Add to dashboard Cite

When check valve works in long distance or high lift liquid pipeline system, it is often subjected to water hammer. In this study, the UDF program was used to simulate the closing process of an axial flow check valve at the moment of pump shutdown, and the porous media model was applied to simulate the complete closing of the valve disc. It was found that there was local vacuum at the end of the valve disc at the moment when the valve was completely closed. The water hammer and characteristics of the force acting on the valve disc in the whole closing process were also obtained. In order to reduce the pressure surges on the valve disc and seat, a built-in critical damping was designed and added to the to the valve disc drive system. Since the spring force is directly proportional to the movement displacement of the valve disc, the elastic force and the speed of the valve disc reach the peak value when the valve is fully closed, while the damping force is directly proportional to the speed of the valve disc, therefore, the damping force increases gradually with the speed of the valve disc, which only produces the maximum damping force at the moment of fully closing, so as to reduce the slam shut, but has little effect on the closing time, thus adding damping is more effective than reducing the elastic force of spring. The current study provides a possible approach to protect the valve disc and seat of check valves in liquid supply and drainage systems.

show abstract

Check valve slam analysis in pumping station

Cited by 6 publications

References 6 publications

Experimental investigation of the check valve behaviour when the flow is reversing

Experimental investigation of the check valve behaviour when the flow is reversing

Physical and mathematical fundamentals of cavitation

Numerical Study on the Closing Characteristics of a Check Valve with Built-in Damping System

Contact Info

Product

Resources

About