0
RESEARCH PAPERS

Effects of Compressibility on Flow Characteristics and Dynamics of Swing Check Valves—Part I

[+] Author and Article Information
K. K. Botros, B. J. Jones

NOVA Research and Technology Corporation, 2928 16 Street N.E, Calgary, Alberta, Canada T2E 7K7

O. Roorda

NOVA Gas Transmission Ltd., Calgary, Alberta, Canada

J. Pressure Vessel Technol 119(2), 192-198 (May 01, 1997) (7 pages) doi:10.1115/1.2842283 History: Received March 26, 1996; Revised September 27, 1996; Online February 11, 2008

Abstract

In the design of natural gas compressor stations, a check valve is a critical element which is commonly placed on the discharge side of the compressor to prevent reverse flow that can cause serious damage to the compressor itself and other components such as seals and bearings. One of the selection criteria of the check valve for this particular application is the valve flow characteristics in steady flow, and its dynamic characteristics in unsteady flow operation. With regards to steady flow valve Characteristics, current models for the determination of the check valve open angle versus mean flow velocity are based on semi-empirical data obtained from water tests, which were found to deviate from measurements involving fluids of relatively higher compressibility. This paper presents results of steady flow testing of an NPS 4 swing type check valve in air. Mean flow velocities versus disk angles were measured together with several local pressure measurements at the back side of the valve disk. Comparison of these results with the EPRI model and Rahmeyer’s model revealed that these two models underestimate the mean flow velocity for a given disk angle in air. A model was thus developed based on further refinement of Rahmeyer’s model, but more suitable for fluids of relatively higher compressibility, and accounts for both torque contributions: (i ) from jet velocity impingement (Kv ), and (ii ) from back pressure distribution (Kp ). The work presented here points out the need for better design of the disk shape, particularly at the lower lip, and/or the valve body in order to create a lower disk back pressure to improve the disk lifting torque at lower mean flow velocity.

Copyright © 1997 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Related

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In