Abstract: According to the structural characteristics of level instrument's L/R cover, an injection mould with side core-pulling and hot runner was designed. analysis and study were made on the mold parting surface, gating system, forming parts, exhaust system, side parting, core pulling mechanism. Through the use of needle valve type hot nozzle and a variety of side core-pulling mechanism, such as inclined core-pulling, composite core pulling, time-delay and forced core pulling, the moud fully met the requirements of above level instrument.

Key words: left and right cover of level instrument, injection mold, design, forced core pulling