Numerical Study on the Sealing Safety of a Valve Packing in a LPG Cylinder

LPG 용기용 밸브패킹의 누설안전에 관한 수치적 연구

  • Kim, Chung-Kyun (Department of Mechanical and System Design Engineering, Hongik University) ;
  • Kim, Tae-Hwan (Department of Mechanical and System Design Engineering, Hongik University)
  • 김청균 (홍익대학교 기계.시스템디자인공학과) ;
  • 김태환 (홍익대학교 기계.시스템디자인공학과)
  • Published : 2007.03.31

Abstract

In this paper, the FEM result has been presented for a sealing safety between a valve packing and a valve seat during a open and close operation in a LPG cylinder. The sealing operation of a LPG valve is completed when the valve packing in which is made by a nylon-66 polymer is to stop a LP gas flow, which flows out from the outlet of a brass pipe in a LPG cylinder. The contact sealing mechanism of the valve may be classified by a flat contact of an unused valve packing and a circular groove contact of an used valve packing in a current LPG valve. Based on the FEM and experimental investigations the sealing force, 4.9 MPa for a flat contact mode of the unused valve packing is a little high compared to that of the used valve packing, which shows a circular groove contact geometry against a valve seat. But these sealing pressures for two contact modes are very low compared to the ultimate strenath 83 MPa of the nylon-66 and this may be designed with a excess strength of the valve.