CN2419431Y

CN2419431Y - Dual sealed lifting plunger valve

Info

Publication number: CN2419431Y
Application number: CN 00208600
Authority: CN
Inventors: 龚仁荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-24
Filing date: 2000-04-24
Publication date: 2001-02-14
Anticipated expiration: 2010-04-24

Abstract

The utility model belongs to an improvement on a plunger valve. A joint site between an inner cavity of a valve body and an inlet is additionally provided with a sealing seat with the action of protecting a lower sealing ring, and the sealing seat forms a mutually inosculating inner cone surface with the lower end face of the plunger. When the plunger moves down to be closed, the plunger is directly supported against the sealing seat. Therefore, the tightness of the plunger can be strengthened, and the ring wearing phenomenon of the lower sealing ring caused by washing and wear can also be avoided. The utility model has the advantages of flexible opening and closing, long service life, reliable use, etc., and can be widely used in conveying pipelines of a petroleum industry, a chemical industry, a pharmacy industry, a foodstuff industry, etc.

Description

Double-sealing lifting rod plug valve

The utility model belongs to a kind of improvement of plunger valve.

Existing plunger valve exists two common faults, and the one, because sealing is not tight between plunger and the Sealing, or the generation gap of washing away, wear and tear of long-time flowing medium, cause that the race of medium is emitted or water clock, influenced the working life of plunger valve; The 2nd, because the rotation of the direct armrest of valve rod wheel drives the keying of controlling plunger, therefore, close or during Open valve, it is time-consuming often to require great effort, and is difficult to start plunger when serious.

The purpose of the utility model is to provide a kind of good airproof performance, the double-sealing lifting rod plug valve that is easy to open and close.

Double-sealing lifting rod plug valve forms cavity and imports and exports the valve body that communicates by one, be contained in the plunger at body cavity center, place lower sealing ring, clamping frame, upper sealing ring between inner chamber and the plunger successively, be contained in above the valve body and the valve gap of roof pressure on upper sealing ring and the driving mechanism composition of drive plunger keying.In body cavity and import jointing place, be provided with a sealing seat, have on the sealing seat and the identical mutually inner conical surface of the garden table top of plunger lower end; When plunger moved down, plunger directly top was combined on the sealing seat, thereby had avoided plunger to move up and down or the washing away of MEDIA FLOW, and caused that lower sealing ring gnaws circle and cause leakage problem.

In order to make handwheel easily open and close plunger valve, driving mechanism of the present utility model is except the valve rod that comprises the lower end and be connected with plunger and be contained in outside the handwheel the valve gap, also on valve rod, be equipped with its spiral and nibble supporting screw-casing, and an one direction thrust bearing is housed all between valve gap and screw-casing bottom and valve rod, handwheel is fixed on screw-casing top, when rotating handwheel, screw-casing is nibbled by spiral and is made valve rod rising opening plunger or decline close plunger, avoided between valve rod and the valve gap because of getting rusty or when boning, being difficult to the disadvantage of direct rotary opening and closing.

Desired embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A partial enlarged drawing of Fig. 1.

Double-sealing lifting rod plug valve, form cavity and import and export the valve body 12 communicate by one, place plunger 13, upper sealing ring 11, lower sealing ring 15, the clamping frame 14 of valve body 12 lumen centers and and be fixed on the valve gap 9 on the valve body 12 with bolt 10 and be connected the valve rod 4 of plunger 13 and the driving mechanism composition of actuate valve stem 4 liftings.

Valve body 12 is shaped on the circle platform in the jointing place of inner chamber and import, be equipped with protection lower sealing ring 15 on the circle platform and gnawed the sealing seat 16 of circle, sealing seat 16 is entrenched in the inboard of lower sealing ring 15, its internal diameter is less than lower sealing ring 15 internal diameter 2-5mm, and sealing seat 16 upper end inwalls are made the inner conical surface that coincide mutually with plunger 13 garden table tops; When plunger 13 moves down roof pressure on sealing seat 16 time, plunger 13 sealing imports on the one hand, lower sealing ring 15 and fluid isolation have been avoided the invalid wearing and tearing of lower sealing ring 15; On the other hand, because sealing seat 16 radially has pressure, lower sealing ring 15 slightly expansion diametrically, thus it more is adjacent on plunger 13 sidewalls and valve pocket inwall, guaranteed to seal in lower sealing ring 15 is effectively.

Clamping frame 14 supports upper and lower seal ring 11,15, make it can keep relatively-stationary distance, plunger 13 adopts stainless steel material to make garden tubular connector in upper and lower seal ring 11,15, plunger 13 lower end mouth outer walls are made the garden table top, the upper end has a connection chamber and plugs together with valve rod 4 lower end square knuckle and be connected, and can prevent from like this to skid between valve rod 4 and the plunger 13.Valve gap 9 roof pressures are on upper sealing ring 11, plunger 13 and upper and lower seal ring 11,15, inside and outside seal degree between valve body 12 and the upper and lower seal ring 11,15 is regulated by bolt 10, valve gap 9 has certain adjusting play with valve body 12 junctions, when causing when leaking because of wearing and tearing in the using process, can adjust fastening screw and fasten 10, be got rid of.

Driving mechanism comprises the screw-casing 3 that is contained on the valve rod 4, with nut 2 and flat key 5, lock washer 6 be fixed on the handwheel 1 on the screw-casing 3 and be separately fixed at valve gap 9 and screw-casing 3 bottoms and valve rod 4 between one direction thrust bearing 8.

Being shaped on the spiral that cooperatively interacts between screw-casing 3 inwalls and the valve rod 4 nibbles; When rotating handwheel 1, rotary sleeve 8 makes valve rod 4 lifting freely by helical toothing, opens and closes laborsaving, convenient purpose thereby reach plunger 13.

Easily and easily see, the utlity model has keying flexibly, good airproof performance, the life-span is long, uses the advantages such as reliable, can Be widely used in the industries such as oil, chemical industry, pharmacy, food.

Claims

1; a kind of double-sealing lifting rod plug valve; comprise that one forms cavity and imports and exports the valve body (12) that communicates; be contained in the plunger (13) of valve body (12) lumen centers; place the lower sealing ring (15) between inner chamber and the plunger (13) successively; clamping frame (14) and upper sealing ring (11); be contained in above the valve body (12) and the valve gap (9) of roof pressure on upper sealing ring (11) and the valve rod (4) that is connected with plunger (13) and the handwheel (1) of actuate valve stem (4) lifting; it is characterized in that: be positioned at valve body (12) inner chamber and import jointing place; be provided with the sealing seat (16) of protection lower sealing ring (15), sealing seat (16) forms the inner conical surface that coincide mutually with plunger (13) lower end surface.

2, according to the described double-sealing lifting rod of claim 1 plug valve, it is characterized in that: the internal diameter of sealing seat (16) is less than the internal diameter of lower sealing ring (15).

3, according to claim 1 or 2 described double-sealing lifting rod plug valves, it is characterized in that: screw-casing (3) is housed on the described valve rod (4), between valve gap (9) and screw-casing (3) and the valve rod (4) one direction thrust bearing (8) is housed all, handwheel (1) is fixed on the screw-casing (3).