DRAIN VALVE Russian patent published in 2005 - IPC

FIELD: mechanical engineering; liquid materials handling facilities.

SUBSTANCE: proposed drain valve has seat secured in reservoir bottom and cup with lid provided with central hole. Overflow unit and shutoff member lifting mechanism are provided. Cup is secured on seat. Overflow unit is made in form of two coaxially arranged inner and outer tubes. Inner tube is installed for axial displacement and fixing relative to outer tube. Float is secured on outer tube from side of its outer surface. Shutoff member is installed on lower end of outer tube. Outer tube is installed for axial displacement and is passed through central hole in cup lid. Float is arranged inside cup. Shutoff member lifting mechanism is made in form of hinge unit connected by tie-rod with overflow unit and mechanically coupled with pushbutton. Pushbutton is installed in reservoir cover by means of thrust bushing. Cup is secured on seat by bayonet joint. Two seats are made on cup lid. Post is secured in each seat. Adjusting bushing is secured on posts. Said bushing is connected by threaded joint with thrust bushing of pushbutton. Rim is secured on adjusting bushing. Hinge support is made on rim. Position of inner tube of overflow unit is fixed relative to outer tube of overflow unit by means of union nut and sealing gasket. Said gasket is clamped by union nut between tube of overflow unit. Hinge unit is made in form of lever. Rotary axle is installed in middle part of lever in hinge support. One end of lever thrust against base of rod. Rod is connected with pushbutton spring-loaded relative to thrust bushing. Other end of lever is connected with upper end of tie-rod. Said tie-rod is connected with -shaped lever from side of its lower end. Said lever is rigidly secured on bracket. The latter is made on outer tube of overflow unit higher than cup.

EFFECT: improved reliability of drain valve owing to simplified design and provision of coaxial arrangement of pushbutton of hinge unit drive and overflow unit.

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