CN2338571Y

CN2338571Y - Sealing means for hard sealing ball valve

Info

Publication number: CN2338571Y
Application number: CN 98218002
Authority: CN
Inventors: 兰静雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-08-03
Filing date: 1998-08-03
Publication date: 1999-09-15
Anticipated expiration: 2008-08-03

Abstract

The utility model relates to a sealing means for a hard sealing ball valve, which comprises a ball piston and a sealing seat. A thrust shaft is arranged on an upper end on the ball valve. A movable steel ball is arranged between a lower end and a valve body. The thrust shaft is matched with the gap of the ball valve and simultaneously and tightly is matched with a center circular hole of a worm wheel. A notch groove is formed on the arc edge of one side of the worm wheel. The notch groove is matched with a positioning pin which is fixed on a valve cover. The worm wheel is engaged with a worm. The worm is linked with a valve rod. The utility model overcomes the defects of easy abrasion and short service life of a hard sealing device of a common ball valve. The utility model has the advantages of no leakage and long service life. The utility model is especially suitable for the use of a large caliber valve.

Description

The hard seal ball valve sealing means

The utility model relates to a kind of hard seal ball valve sealing means.

The seal arrangement of ordinary ball valve, generally all be based on soft seal, generally these have flexible nonmetallic material and make sealing seat with teflon or rubber, by them spool is clamped, reach sealing, still, because these nonmetallic material can not be born high temperature or high pressure, thereby dwindled their using scope greatly, therefore just required hard seal ball valve to replace, to adapt to the Environmental Conditions of High Temperature High Pressure.Traditional hard seal ball valve, all be to copy the nonmetallic material encapsulating method, with elastic element sealing seat is pressed in tightly and reaches sealing on the spool, but when valve opens or closes at every turn, all will produce sliding friction strong between spheroid and sealing seat, the damage sealing surface, thus cause valve very easily to leak, have a strong impact on working life.

The purpose of this utility model is the above-mentioned defective that overcomes prior art, thereby a kind of simple in structure, hard seal ball valve sealing means of not having wearing and tearing, zero leakage is provided.

The utility model comprises bulb stopper and sealing seat, the bulb stopper upper end is provided with thrust axis, movable steel ball is set between lower end and the valve body, thrust axis and bulb stopper Spielpassung and simultaneously with the hole, garden, center of worm gear close-fitting mutually, form gap slot on the one side arc limit of worm gear, gap slot matches with locating stud on being fixed on valve gap, worm gear and worm meshing, worm screw and valve rod interlock.

Further illustrate particular content of the present utility model below in conjunction with drawings and Examples.

Accompanying drawing is a structural representation of the present utility model.

As shown in the figure, the utility model comprises bulb stopper 1 and sealing seat 2, and bulb stopper 1 upper end is provided with thrust axis 3, thrust axis 3 and bulb stopper 1 Spielpassung and simultaneously with the hole, garden, center of worm gear 5 close-fitting mutually, movable steel ball 4 is set between bulb stopper 1 lower end and the valve body, makes loose joint between bulb stopper 1 and valve body.Form gap slot 6 on the one side arc limit of worm gear 5, gap slot 6 matches with locating stud 7 on being fixed on valve gap, worm gear 5 and worm screw 8 engagements, and worm screw 8 is linked with valve rod.Under opening state, bulb stopper 1 does not contact with sealing seat 2, when worm screw 8 clockwise rotates, drive with the worm gear 5 and thrust axis 3 inhours of its engagement and rotate, bulb stopper 1 is closed along counterclockwise direction, and do not rub when closing with sealing seat 2, after locating stud 7 was run on 6 left sides of the gap slot on the worm gear 5, under the effect of worm gear 5, locating stud 7, worm gear 5 and thrust axis 3 horizontal straight lines moved, make bulb stopper 1 around movable steel ball 4 towards the swing of the direction of sealing seat 2, and be pressed on the sealing seat 2 and close valve.When worm screw 8 inhours were rotated, thrust axis 3, worm gear 5, bulb stopper 1 resetted, and sealing seat 2 breaks away from bulb stopper 1, and produces certain clearance, and when locating stud 7 contacted with the right of gap slot 6, valve wide open put in place.

The utility model is by above-mentioned concrete structure, ball valve is greatly improved at aspects such as using scope, working lifes, and it is also very good aspect technology capability, be particularly suitable for large bore valves, if mix actuating devices such as electronic or pneumatic, the automation control of industrial process will be easy to realize.

Claims

1, a kind of hard seal ball valve sealing means, comprise bulb stopper and sealing seat, it is characterized in that: bulb stopper (1) upper end is provided with thrust axis (3), movable steel ball (4) is set between lower end and the valve body, thrust axis (3) and bulb stopper (1) Spielpassung and simultaneously with the hole, garden, center of worm gear (5) close-fitting mutually, form gap slot (6) on the side arc limit of worm gear (5), gap slot (6) matches with locating stud (7) on being fixed on valve gap, worm gear (5) and worm screw (8) engagement, worm screw (8) and valve rod interlock.