INDUCED OPENING DEVICE OF HALF-BALL VALVE

摘要

The present invention relates to a large half-ball valve which opens and closes a pipe by applying a half-sphere typed ball of a cover shape inside a valve and, especially, to an opening inducing device of a half-ball valve which smoothly performs an opening operation in case high pressure is generated at the inflow hole side in the closing. The opening inducing device of the half-ball valve which is proposed by the present invention comprises a sheet (C) which is in contact with the surface of a half-ball (B) on the inflow hole (A1) side inside a main body (A). The half-ball valve is formed to push the surface of the half-ball (B) by elastically installing a spring (C1) on the sheet (C). An auxiliary elastic ring (10) which is mounted on a mounting groove (20) inside an inner sheet (C) of the main body (A) to be slide back and forth is added to the composition of the half-ball valve. The inner circumference surface of a front end of the auxiliary elastic ring (10) is in contact with the outer circumference surface inside the sheet (C) and a spring (11) is elastically installed on a rear end of the auxiliary elastic ring (10). The auxiliary elastic ring (10) can push the sheet (C) to the rear side of the inflow hole (A1) side.