FIELD: combustible gas pressure controller, possibly subsidiary devices for controlling propane pressure at gas-flame treating of metals. SUBSTANCE: pressure reducing unit includes sleeve joined with housing, seat, locking member opening coaxially relative to seat and with possibility of engaging with it, sealing ring. At one side of diaphragm adjusting screw is arranged with possibility of engaging with said diaphragm through stopper and spring. At other side of diaphragm there is cavity communicating with outlet opening. Pusher is arranged between locking member and diaphragm coaxially relative to them. Seat is in the form of threaded collar with annular recess and it is mounted in sleeve. The last has cone bead that forms groove together with annular recess of collar. Round cross section rubber sealing ring is placed in said groove for providing spot contact with ball-shaped locking member. Pressure reducing unit is removable one and it is arranged coaxially relative to inlet opening. Sleeve is joined with housing by means of threaded joint. Such structure allows to improve accuracy for sustaining pressure by 1,3 times at simultaneously lowering effort acting upon sealing member and reducing pressure of "stop mode" by 1.5-2 times. It also provides lowered by 50% cost of apparatus, its size and mass decreased by 1.5-2 times. EFFECT: enhanced accuracy at regulating pressure, lowered cost and size of apparatus. 2 cl, 2 dwg
