TWO-VALVE COCK Russian patent published in 1998 - IPC

FIELD: manufacture of fittings. SUBSTANCE: two-valve cock has body 1, shut-off member 12 made in form of plate, stem 13 and plug 9. Drive unit is made in form of handle 8 with threaded spindle or handle-clamp with axial projection and ends radially directed towards center; these ends pass through slots provided in flanges of body and cover. Body 1 is provided with projections 7 which are used to limit turn of clamp. Stem 13 has three stages: one stage carries plate 12; other stage is sealed by means of gland consisting of circular rubber sealing member 21 pressed by two nuts 20 and 22 with sealing member 23 located in it and made from softer material; sealing member 23 is pressed by spring 24. Rod is provided with additional movable plate 18, spring 19 being fitted between plate. Fitted on end of stem is cylindrical of stepped head 25; ball 26 is mounted between end of stem or head and drive unit. Filter 10 is mounted in inlet hole of body. EFFECT: enhanced reliability. 3 dwg