Gate valve and motor-operator research findings

Steele, R.; DeWall, K.G.; Watkins, J.C.; Russell, Mark J.; Bramwell, D.

doi:10.2172/106407

Cited by 2 publications

(3 citation statements)

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“…Zakirnichnaya and Kulsharipov [8] captured the velocity vector plot on either side of the gate valve, which shows the formation of separation zones and reverse flow therein. Also, Steele et al [9] measured the force exerted on the stem at different gate positions. They have also reported that this force keeps on fluctuating continuously [8].…”

Section: Mechanism Of Gate Valvementioning

confidence: 99%

Modification in gate valve using flexible membrane pipe for flow measurement

Bhilare¹,

Hinge

Kumbhalkar³

et al. 2021

SN Appl. Sci.

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A gate valve is used to regulate discharge in pipelines. It is rotated by a wheel that is attached to a circular disc (i.e. gate) at the top of a stem. Each revolution of the wheel creates a particular linear disc movement that changes the flow zone. The paper describes the journey of gate valve from flow control device to flow measuring device and presents an experimentation on conventional gate valve and gate valve with flexible membrane pipe. The findings of experimental study are described and validated with CFD analysis of conventional and modified gate valve. The experimental study has shown that the modified gate valve can be used as flow measuring device. The results obtained represent the excellent improvement in the relationship between disc position (i.e., angle) and discharge. The results of CFD analysis for flow through gate valve with and without flexible membrane are compared. After carrying out the CFD studies without flexible membrane, it is found that, fluctuating separation zones formed on either side of gate are responsible to a great extent to the flow rate descripancies. This paper compares the experimental and CFD results and also suggests the remedy to address the problem. Article highlights Introduced simply a flexible membrane pipe inside PVC to convert gate valve into flow measuring device. Reduction in flow separation and fluctuation in flow rate. Smooth flow rate even though gate valve opening is small.

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Section: Mechanism Of Gate Valvementioning

confidence: 99%

Modification in gate valve using flexible membrane pipe for flow measurement

Bhilare¹,

Hinge

Kumbhalkar³

et al. 2021

SN Appl. Sci.

View full text Add to dashboard Cite

show abstract

“…is an integration of the th measured motor torque during baseline test. As discussed in Section II, in "major findings during the baseline test in Korean NPPs" the stem factor can be expressed as in (2) where " " and " " are the exponents to be determined using the log-log regression analysis (2) To calculate the exponents and , the natural log of both sides of (2) is taken as (3) The method of least-sum-of-square-errors requires partial differentiation by and to be zero, then the exponent and are obtained from (4)…”

Section: B Nonlinear Correlation Model Using Log-log Regression For mentioning

confidence: 99%

“…Accordingly, MUG recommended that MOVs with less than 25% operating Manuscript margin are not the candidates for MCC-based testing without additional justification [1]. A valve's operating margin is the difference between the actuator's available output and the valve's requirement at design basis conditions [2]. The assumptions that are applied to MPM and methods if they are used for MOV performance verification tests are: the MPM can maintain its accuracy when the thrust load remains relatively constant over time, and the requires accurate and conservative actuator efficiency and stem factor in order to quantify stem thrust.…”

Section: Introductionmentioning

confidence: 99%

Error analysis in improved motor control center method for stem thrust estimation of motor-operated valves in nuclear power plants

Jung

Seong

2003

IEEE Trans. Nucl. Sci.

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An error analysis for improved motor control center (MCC) method that estimates the stem thrust of motor-operated valve (MOV) is suggested in this work. This method focuses on providing an alternative means for the periodic performance verification test with relatively lower error than the conventional MCCbased method. For evaluating the overall error of the improved MCC method, the errors are classified into two categories: the biased error and the random error. The biased error consists of the mean of the relative error between measured and estimated torque and that of the stem factor. The random error comes from the statistical analysis of the measured torque, stem factor, and motor electric data. The experiment result shows that this method has a reasonably lower error than the MCC-based method. Therefore, this method can be applied to the periodic verification test of valves with relatively low margins.

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Gate valve and motor-operator research findings

Cited by 2 publications

References 0 publications

Modification in gate valve using flexible membrane pipe for flow measurement

Modification in gate valve using flexible membrane pipe for flow measurement

Error analysis in improved motor control center method for stem thrust estimation of motor-operated valves in nuclear power plants

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