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Research Papers: Operations, Applications & Components

A Study of the Sealing Performance of a New High-Pressure Cone Valve for Deep-Sea Gas-Tight Water Samplers

[+] Author and Article Information
Shi-Jun Wu, Can-Jun Yang, Ying Chen, Yan-Qing Xie

State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

J. Pressure Vessel Technol 132(4), 041601 (Aug 05, 2010) (5 pages) doi:10.1115/1.4001204 History: Received June 20, 2009; Revised February 01, 2010; Published August 05, 2010; Online August 05, 2010

The cone valve plays an important role in high-pressure sealing applications. In this paper, a new high-pressure cone valve, based on the titanium alloy poppet-to-polyetheretherketone seat sealing structure, is proposed for deep-sea gas-tight water samplers. In order to study the sealing performance of the new valve, both the conforming poppet-seat contact model and the nonconforming poppet-seat contact model were evaluated. Finite element analysis based on the two models was performed and validated by experiments. The results indicate that the nonconforming poppet-seat contact model has a better sealing performance than the conforming poppet-seat contact model. The new cone valve also was applied in a gas-tight hydrothermal fluid sampler and successfully tested in a sea trial during the KNOX18RR cruise from 9 July to 12 August 2008.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic illustration of the high-pressure cone valve

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Figure 2

Valve poppet and seat; D1=D2=D3

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Figure 4

PEEK material model

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Figure 5

Displacement versus force curves for the valve poppet-seat compression, resulting from FEA and experiments. The cone angle of the poppet is 60 deg, and the cone angles of two seats are 60 deg and 65 deg.

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Figure 6

Von Mises equivalent stress distribution of valve seat with cone angle of 60 deg. Compressive force is 327 N.

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Figure 7

Von Mises equivalent stress distribution of valve seat with cone angle of 65 deg. Compressive force is 320 N.

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Figure 8

Contact pressure distributions along the contact faces. The location of x=0 is the lower start point of the seat’s cone face. Compressive forces are 320 N and 327 N for seats of 60 deg and 65 deg cone angles, respectively.

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Figure 9

Schematic illustration of the valve experiment system

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Figure 10

Experimental results of the sealing performance of the cone valve. For the conforming poppet-seat contact model, the cone angle of the seat is 60 deg, and for the nonconforming poppet-seat contact model, the cone angle of the seat is 65 deg.

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Figure 11

Application of the new cone valve in a gas-tight sampler for collecting hydrothermal fluids. Panel A: sampling at a vent of Rainbow hydrothermal field. Panel B: sampling at a vent of Lost City hydrothermal field.

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