CN2234023Y

CN2234023Y - Gate valve with expandable gate plate

Info

Publication number: CN2234023Y
Application number: CN 95214116
Authority: CN
Inventors: 张继刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-06-20
Filing date: 1995-06-20
Publication date: 1996-08-28
Anticipated expiration: 2005-06-20

Abstract

The utility model relates to a gate valve with expandable gate plates, which comprises a valve body 1, a valve cover 13 and a valve handle 5. The inner portion of the valve body 1 is provided with two valve sealing seats 2. Two gate plates 3 are corresponding to the two valve sealing seats 2. The middle portion of the two gate plates 3 is provided with a draw plate 4. The draw plate 4 is provided with a V-shaped convex ear. The gate plates 3 are provided with a hook-shaped convexity 17 and a convexity 22 with two inclined surfaces. When the draw plate 4 upward or downward moves under the transmission of the thread of the valve handle 5, the gate plates 3 can be upward lifted or downward placed and expanded in order to open or close the gate valve. Compared with the known gate valve, the friction between the gate plates and the sealing seats does not exist when the gate valve is opened. The opening and the closing are flexible and machine components are uneasy to be damaged. The accidents that the valve can not be opened or tightly closed can not appear.

Description

The gate valve that has the expansible flashboard

The utility model relates to the valve that is used for fluid control, especially a kind of gate valve that is used for industries such as oil, chemical industry, oil refining and electric power.

Gate valve is widely used in industries such as oil, chemical industry, oil refining.Present gate valve is directly driven the flashboard lifting of wedge shape by valve rod.When flashboard was fallen, the sealing seat of flashboard and valve body was fitted, and gate valve is closed; When flashboard was mentioned, the sealing seat of flashboard and valve body was thrown off, and gate valve is opened.For gate valve is closed tightly, need exert pressure to the wedge shape flashboard by valve rod, the sealing seat on itself and the valve body is fitted tightly.When opening valve, need the wedge shape flashboard to be imposed big pulling force the sealing seat of flashboard and valve body is broken away from by valve rod.Therefore, the valve rod of gate valve is stressed bigger like this, the operation effort, and the parts that match with valve rod wear and tear easily, and the flashboard wearing and tearing are also more serious.Because operation is dumb, tension during the flashboard expanded by heating especially can not be opened under the state of emergency or accident can appear in cutting-off valve.

The purpose of this utility model is to construct existing above-mentioned defective at present gate valve, when a kind of opening and closing gate valve is provided, there are not friction in flashboard and valve seal seat, thereby open-close convenient, component wear is little, can not occur opening and closing the gate valve that has the expansible flashboard of accident such as malfunctioning under the state of emergency.

The utility model is achieved in that the gate valve that has the expansible flashboard comprises valve body, valve seal seat, valve gap, valve rod and handwheel.Valve gap links to each other by bolt with valve body, and seal ring is housed between junction surface.A sealing cover is equipped with at the valve body position that links to each other with valve gap.Metallic gasket, packing, packing plug are housed in the groove of sealing cover.The packing plug is compressed by gland.Gland is by screw thread and valve gap engagement.Be placed with ball for reducing to rub between gland and packing plug.The position that valve rod is arranged in packing has the bulge loop that limits the valve rod axial float.Stem lower portion is connected with pushing-pulling-plate by screw thread.Pushing-pulling-plate is between two flashboards.With the corresponding position of two flashboard symmetry center a wedge shape projection is arranged on the valve body.The one side of flashboard has a ring surface that cooperates with the valve seal seat.Two hook-type projectioies with hook-type face are arranged at top on the other hand.Two two Dou face projectioies are arranged below the two hook-type projectioies.The top of two Dou face projectioies is last Dou face, is following Dou face below.Two parallel columns are arranged on the pushing-pulling-plate.There is a V-arrangement lug in the outside of each column.The head of two columns is the sphenocephaly that has the inclined-plane.Pushing-pulling-plate is between two flashboards.Lug on two columns of pushing-pulling-plate is between the hook-type projection and two Dou face projectioies of two flashboards.

The gate valve working procedure that has the expansible flashboard is: when opening valve, rotate handwheel, the screw thread by valve rod is pulled upwardly pushing-pulling-plate.When pushing-pulling-plate was pulled upwardly, two V-arrangement lugs on the pushing-pulling-plate drove on two flashboards by four hook-type projectioies on two flashboards and move, with valve open.During throttle down, backward rotation handwheel, valve rod promote pushing-pulling-plate by screw thread and descend, and two flashboards descend under self gravitation simultaneously.When two flashboards dropped near minimum point, under the effect of the projection of the wedge shape on the valve body, the bottom began distending, until being adjacent to sealing seat.Continue the backward rotation handwheel, pushing-pulling-plate continues to move down under valve rod promotes, and its ligulate head is inserted between the double inclined plane projection of two flashboards, and forces two flashboard tops separately, till the two flashboards outside all is close to the valve seal seat.This moment, valve was closed fully.

The utility model advantage is, so not friction can not destroy the sealability of sealing surface, has prolonged life of valve between two flashboards and valve sealing face, while flexible operation, laborsaving, and the parts that match with valve rod are not fragile.

Fig. 1 is that the master who has expansible flashboard gate valve looks sectional view;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is the plan view of flashboard;

Fig. 4 is the cut away left side view of Fig. 3;

Fig. 5 is the plan view that lifts plate;

Fig. 6 is the left side view of Fig. 5;

Fig. 7 is the stereogram of flashboard;

Fig. 8 is the stereogram that lifts plate.

The utility model is described in further detail below in conjunction with embodiment shown in the drawings:

The gate valve that has the expansible flashboard comprises valve body 1, valve seal seat 2, valve gap 13.Valve seal seat 2 is contained in the valve body 1.Valve gap 13 links to each other with valve body 1 by double-screw bolt 15.Between valve gap 13 and the valve body 1 seal ring 14 is housed.Sealing cover 6 is housed on the valve body 1.Metallic gasket 7 is housed, packing 8, packing plug 9 in the slotted eye of sealing cover 6.Packing plug 9 usefulness glands 11 compress.Gland 11 links to each other with valve gap 13 by screw thread.Between gland 11 and the packing plug 9 spin 10 is housed.The valve rod 5 that has handwheel 12 passes gland 11, packing plug 9, and packing 8 and metallic seal 7 are loaded in the valve body 1.Valve rod 1 is arranged on a section of packing 8 bulge loop 16 that prevents valve rod play about in the of 5.With two corresponding positions of valve seal seat two flashboards 3 are arranged in the valve body 1.3 on two flashboards have a pushing-pulling-plate 4.Pushing-pulling-plate 4 links to each other with valve rod 5 by screw thread.One side of flashboard 3 is the sealing surface that cooperates with valve seal seat 2, and the hook-type projection 17 of two symmetries is arranged at the top of opposite side, and the double inclined plane projection 22 of two symmetries is arranged at the bottom.Double inclined plane projection 22 tops have one to go up Dou face 21, and a lower inclined plane 23 is arranged below.It below the hook-type projection 17 on flashboard 3 tops a hook-type inclined-plane 18.Pushing-pulling-plate 4 can be mentioned flashboard 3, and gate valve is opened, and also can make flashboard 3 whereabouts and make its distending, and gate valve is closed.Pushing-pulling-plate 4 links to each other with valve rod 5 by tapped hole, and drives lifting by valve rod 5.Pushing-pulling-plate 4 has two columns 25.The outside of two columns 25 respectively has a V-arrangement lug that is used to promote flashboard 3 to have 19.Two columns, 25 lower ends are sphenocephaly 20, and during installation, the V-arrangement lug is between the hook-type projection 17 and double inclined plane projection 22 of flashboard 3.Distending voluntarily when making two flashboards 3 drop to valve seal seat 2 bottoms, a bar wedge shape projection 24 is arranged at the bottom of valve body 1.

Claims

A kind of gate valve that has the expansible flashboard comprises valve body, valve seal seat, valve gap, valve rod and handwheel; Valve gap links to each other by bolt with valve body, and seal ring is housed between junction surface, it is characterized in that, a sealing cover is equipped with at the valve body position that links to each other with valve gap, and metallic gasket, packing, packing plug are housed in the groove of sealing cover; The packing plug is compressed by gland; Gland is by screw thread and valve gap engagement; Be placed with ball between gland and packing plug; The position that valve rod is arranged in packing has the bulge loop that limits valve rod between centers play; Stem lower portion is connected with pushing-pulling-plate by screw thread; Pushing-pulling-plate is between two flashboards; With two corresponding positions of flashboard symmetry center a wedge shape projection is arranged on the valve body; The one side of flashboard has a ring surface that cooperates with the valve seal seat, and two hook-type projectioies with hook-type face are arranged at the top of another side; Two double inclined plane projectioies are arranged below the two hook-type projectioies; The top of double inclined plane projection is ramp, is lower inclined plane below; Two parallel columns are arranged on the pushing-pulling-plate, and there is a V-arrangement lug in the outside of each column, and the head of two columns is the sphenocephaly that has the inclined-plane; Pushing-pulling-plate is between two flashboards; Lug on two columns of pushing-pulling-plate is between the hook-type projection and two Dou face projectioies of two flashboards.