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Research Papers: Flows in Complex Systems

Pressure Drop Analysis of Pilot-Control Globe Valve With Different Structural Parameters

[+] Author and Article Information
Zhi-jiang Jin

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
e-mail: jzj@zju.edu.cn

Zhi-xin Gao

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
e-mail: zhixingao@foxmail.com

Ming Zhang

Hangzhou Worldwides Valve Co., Ltd.,
Hangzhou 311122, China
e-mail: 392527626@qq.com

Jin-yuan Qian

Institute of Process Equipment;State Key Laboratory of Fluid
Power and Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Department of Energy Sciences,
Lund University,
Lund SE-22100, Sweden
e-mails: qianjy@zju.edu.cn;
jin-yuan.qian@energy.lth.se

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 11, 2017; final manuscript received March 3, 2017; published online June 7, 2017. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 139(9), 091102 (Jun 07, 2017) (12 pages) Paper No: FE-17-1029; doi: 10.1115/1.4036268 History: Received January 11, 2017; Revised March 03, 2017

Pilot-control globe valve (PCGV) can use the pressure drop caused by fluid flowing through the orifice located at valve core bottom to open or close the main valve using a small pilot valve. In this paper, computational fluid dynamics (CFD) method is adopted to analyze the pressure drop before and after valve core of PCGV and minor loss of orifice under different structural parameters and inlet velocities, and the simulation results show a good agreement with the experimental results. It turns out that the valve diameters, orifice diameters, and pilot pipe diameters have great influences on the pressure drop and the loss coefficient. Moreover, an expression is proposed which can be used to calculate minor loss coefficient, then to estimate the pressure drop and driving force of a PCGV within limited conditions. This paper can be referenced as guidance for deciding the dimension of structural parameters and spring stiffness during design process of a PCGV.

Copyright © 2017 by ASME
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References

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Figures

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Fig. 1

Structure diagram of studied PCGV

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Fig. 2

Three-dimensional simplified geometry (left) and computational mesh (right)

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Fig. 3

Pressure profile on the surfaces of valve core bottom

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Fig. 4

Simplified flow field in PCGV

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Fig. 5

The experimental sketch

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Fig. 6

Comparison between experimental results and simulated results

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Fig. 7

The effects of velocity on pressure drop: (a) dp = 10 mm, (b) dp = 15 mm, (c) dp = 20 mm, and (d) dp = 25 mm

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Fig. 8

The pressure contour and velocity streamline under different inlet velocities: (a) v = 1 m/s and (b) v = 3 m/s

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Fig. 9

The effects of velocity on the loss coefficient: (a) dp = 10 mm and (b) dp = 15 mm

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Fig. 10

The effects of valve diameter on the pressure drop: (a) dp = 15 mm and (b) dp = 25 mm

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Fig. 11

The pressure contour and velocity streamline under different valve diameters: (a) DN = 150 mm and (b) DN = 200 mm

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Fig. 12

The effects of valve diameter on the loss coefficient: (a) dp = 15 mm and (b) dp = 25 mm

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Fig. 13

The effects of orifice diameter on the pressure drop: (a) v = 1 m/s and (b) v = 3 m/s

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Fig. 14

The pressure contour and velocity streamline under different orifice diameters: (a) do = 6 mm and (b) do = 16 mm

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Fig. 15

The effects of orifice diameter on the loss coefficient: (a) v = 1 m/s and (b) v = 3 m/s

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Fig. 16

The effects of pilot pipe diameter on the pressure drop: (a) v = 1 m/s and (b) v = 2.5 m/s

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Fig. 17

The pressure contour and velocity streamline under different pilot pipe diameters: (a) dp = 15 mm and (b) dp = 25 mm

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Fig. 18

The effects of pilot pipe diameter on the loss coefficient: (a) v = 1 m/s and (b) v = 2.5 m/s

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Fig. 19

Comparison between simulation and calculation using Eq. (20): (a) DN = 100 mm, dp = 10 mm and (b) DN = 200 mm, dp = 25 mm

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