CN2358290Y

CN2358290Y - Bidirectional metal sealing ball valve

Info

Publication number: CN2358290Y
Application number: CN 99225554
Authority: CN
Inventors: 黄作兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-25
Filing date: 1999-01-25
Publication date: 2000-01-12
Anticipated expiration: 2009-01-25

Abstract

The utility model relates to a bidirectional metal sealing ball valve. The utility model comprises a valve body, two valve clacks, a wedge spherical body, a valve rod, a hand wheel, etc., wherein, the wedge spherical body is in sliding connection with the valve clacks, the lower end of the valve rod is connected with the wedge spherical body, and a guide pin which is arranged on the valve body is arranged in a guide groove of the valve rod in the matching manner. The utility model is characterized in that a position near the lower end of the valve rod is also provided with a claw-shaped pull cap; two claw parts of the claw-shaped pull cap are arranged on the peripheral surface of the upper end of each of the two valve clacks through matching. The valve rod moves and rotates so as to drive the claw-shaped pull cap and other components to realize the openness and the closeness of the valve, and furthermore, the pressure relief manner is changed so that leakage is effectively prevented. In addition, the guide groove has a screw section; thereby, self-lock can be realized, and the flow rate is stable. A scale which extends out of the valve rod offers convenience to the control of the flow rate.

Description

Bidirectional metal sealing ball valve

The utility model relates to a kind of ball valve, relates in particular to the bidirectional metal sealing ball valve of three sections spheroid expansion and shrinkage types.

Ball valve is rapid because of opening and closing, the breathing sealing surface does not have wearing and tearing, flow resistance is low, so be used widely.Three sections spheroid expansion and shrinkage type ball valves are owing to be divided into three parts with spheroid, and but the fixing pin that passes through slide relative connects, the upper and lower motion contraction of wedge-type spheroid or distending sphere diameter in the middle of rotatablely moving of spheroid resolved into and drive the side-to-side movement of both sides ball clack, this structure has been avoided the scratch of metal-seated, and have enough seal pressures, and can be used for high temperature and high pressure condition.

Yet, often there is leakage phenomenon in existing 3 stops bidirectional metal sealing ball valve, this is owing to relief hole in the existing 3 stops ball valve all is arranged on the ball clack, so the existence of relief hole has increased leakage point, simultaneously because surface abrasion between ball clack and the wedge spheroid or the scratch of grit medium can cause leakage.In addition, during the upper and lower displacement of the float valve in the existing 3 stops ball valve, can push upper and lower seal valve seat, easily cause the sealing surface uneven wear and leak.In addition, guide groove on existing its valve rod of 3 stops ball valve is the right angle guide groove, in the ball valve opening-closing process, meet right angle zone easily stuck or cut off pilot pin, and the right angle guide groove do not have self-lock ability to pilot pin, so cause instability of flow when flap being rotated during the fluid impact flap in the pipeline.The ball valve of prior art does not have valve position and opens and closes angle indication accurately, can't realize Flow-rate adjustment accurately.

In view of the problem that prior art exists, the purpose of this utility model is to provide a kind of bidirectional metal sealing ball valve, and this ball valve can prevent to leak effectively.

Further purpose of the present utility model is to provide a kind of bidirectional metal sealing ball valve, and the valve body of this ball valve can keep stability of flow, and easy to use.

For achieving the above object, a kind of bidirectional metal sealing ball valve of the utility model, the formations such as wedge spheroid, valve rod and handwheel that comprise valve body, two flaps, are slidingly connected with flap, wherein valve rod is connected by screw mandrel, nut structure with handwheel, the valve rod lower end connects described wedge spheroid, also offer a guide groove on the valve body, on the valve body one fixedly pilot pin be engaged in the described guide groove, flap can cooperate with the metal seat valve on the valve body; Be characterized in that described valve rod also is provided with a claw type near lower end and draws cap, described claw type draws two claws of cap to be engaged on the upper end outer circumferential face of described two flaps.

Compared with prior art, because the valve rod of bidirectional metal sealing ball valve of the present utility model is provided with a claw type near lower end and draws cap, claw type draws two claws of cap to be engaged on the upper end outer circumferential face of two flaps, and valve rod, valve rod guide groove, claw type draw cap, flap, wedge spheroid etc. to constitute the escapement of realizing valve opening and closing.Not only move, rotate and drive claw type and draw member such as cap can realize the keying of valve, and can change the pressure release mode and leak preventing effectively by valve rod; In addition, guide groove has spiral section and can realize self-locking and make stability of flow that the scale that stretches out on the valve rod is convenient to control flow rate.

Below with reference to the accompanying drawings the preferred embodiment of bidirectional metal sealing ball valve of the present utility model is described, wherein:

Fig. 1 is the sectional view of the utility model bidirectional metal sealing ball valve;

Fig. 2 is the schematic representation at ball valve shown in Figure 1 valve position when being in the pressure release state;

Fig. 3 be the expression ball valve shown in Figure 1 be in opening and closing respectively the time state;

Fig. 4 is the schematic representation of expression ball valve valve rod upper rail shown in Figure 1;

Fig. 5 is the schematic representation of the flow scale on the expression ball valve.

See also shown in Figure 1ly, there is shown according to three sections spheroid expansion and shrinkage type bidirectional metal sealing ball valves of the present utility model.This ball valve mainly by valve body 1, two flaps 2, be slidingly connected with flap that (its Placement can be as prior art for together wedge spheroid 3, do not describe in detail at this), formation such as valve rod 4 and handwheel 5, wherein flap 2 can cooperate with the metal seat valve 6 on the valve body 1.Handwheel 5 cooperates with thread section 41 on the valve rod 4 by screw mandrel, nut structure, valve rod 4 outer peripheral surfaces are provided with a guide groove 42, this guide groove 42 is made of straightway and spiral section, a pilot pin 11 that is fixed on the valve body 1 is engaged in this guide groove 42, in addition, the lower end of valve rod 4 also is fixed with a claw type and draws cap 43, this claw type draws the both sides claw of cap 43 to grab on the oblique outer circumferential face of flap 2 upper ends, and valve rod 4, guide groove 42, claw type draw cap 43, flap 2 and wedge spheroid 3 to constitute the escapement that the utility model control ball valve opens and closes together like this.

The opening and closing operations situation of three sections spheroid expansion and shrinkage type two way sealed metal ball-valves of the present utility model is as follows:

During unlatching, rotate counterclockwise handwheel 5,, thereby valve rod 4 straight lines are moved upward, and drive wedge spheroid 3 simultaneously and claw type draws cap 43 to move upward because this moment, the fixedly pilot pin 11 on the valve body was arranged in the straightway of valve rod guide groove 42; Owing to pressure to two flaps 2 has been removed in the rising of wedge spheroid, simultaneously because claw type draws two claws of cap 43 to grab on the oblique outer circumferential face of flap 2 upper ends, when on drawing cap, moving to the oblique outer circumferential face application of force, utilize lever principle, flap 2 is that fulcrum inwardly shrinks with the straight shape outer circumferential face in bottom place, flap 2 separates with valve seat 6, and pressure release is carried out in its generation gap.Then, be rotated further handwheel 5, valve rod 4 moves on continuing, and when pilot pin 11 moved in guide groove 42 spiral sections, valve rod 4 beginnings rose on while rotate, and drive wedge spheroid 3, claw type draw cap 43 to rise on together while rotating.The rotation of wedge spheroid 3 can drive flap 2 and rotate, and makes valve be opened into fully open position gradually.

When closing, clockwise rotate handwheel 5, because this moment, pilot pin 11 still was in the spiral section of guide groove 42, thus valve rod 4 limit trailing edge rotations, thus wedge spheroid 3 drives flap 2 rotations simultaneously, until turning to the valve closed position.When being rotated further handwheel 5, pilot pin 11 enters the straightway of guide groove 42, valve rod 4 is stopped operating, and continue downward straight line motion, it is descending that wedge spheroid 3 draws cap 43 to continue with claw type, draws the claw of cap 43 descending along the oblique outer circumferential face of flap, decontrols flap 2, at this moment, wedge spheroid 3 descending distending flaps 2.Two flaps 2 are fulcrum with the cylindrical outer peripheral surface of its lower end respectively, near until abutting against fully on valve seat, realize the reliable dual face seals of distending to valve seat 6.

From the opening process of above-mentioned spheroid as seen, in the utility model, the escapement that is made of valve rod 4 grades makes two flaps 2 before rotating, because the effect of drawing cap, and be that fulcrum contracts two flaps 2 to break away from valve seat 6, form the pressure release space simultaneously with external cylindrical surface place, flap 2 lower end, thereby changed traditional on flap the structure of Leak hole, thereby reduced leakage point, also avoided the leakage that causes owing to wearing and tearing between the contact surface of wedge spheroid 3 surfaces and two flaps 2 simultaneously; In addition, two claws that draw cap are to catch tiltedly outer circumferential face of two ball clacks upper end simultaneously evenly, cylinder is fixed on the valve body under two ball clacks, prevent upper and lower play, so two ball clacks do not resemble the prior art upper and lower when moving and rotating spheroid all be in unsteady, two ball clacks are when upper and lower displacement, and ball clack causes the upper and lower seal valve seat of excessive compression easily and makes the sealing surface uneven wear and occur leaking.

From the foregoing description, can also learn, guide groove 42 has straightway and spiral section in the utility model, like this when in the valve body opening-closing process, be in spiral section when pilot pin 11 and make opening of valves or when closing, there is the spiral self-locking angle in the guide groove wall, and the pilot pin 11 that arrives a certain position is self-locking on this position, so that stability of flow; And pilot pin 11 moves freely in guide groove 42 in the prior art, can change the position of pilot pin 11 in guide groove 42 when being subjected to fluid impact, thereby causes the rotation of valve rod 4 and ball clack 2 to make instability of flow.

Except These characteristics, operator's control valve opens and closes degree for convenience, and the utility model also is provided with one section scale 7 that stretches out outside the handwheel in the valve rod upper end, is carved with on the scale 7 and the corresponding scale of flow size, 0 ° of expression valve is in closed condition, and 90 ° of expression valves are in opening state.

Above in conjunction with a description that preferred embodiment is carried out the utility model of the present utility model, but those of ordinary skill in the art is appreciated that, in the utility model design scope, can also carry out multiple changes and improvements to above-mentioned preferred embodiment, will be understood that all changes and improvements all should fall in the scope of appended claims.

Claims

1. bidirectional metal sealing ball valve, wedge spheroid (3), valve rod (4) and handwheel formations such as (5) that described ball valve comprises valve body (1), two flaps (2), is slidingly connected with flap, wherein valve rod (4) is connected by screw mandrel, nut structure with handwheel (5), valve rod (4) lower end connects described wedge spheroid (3), also offer a guide groove (42) on the valve body (1), on the valve body (1) one fixedly pilot pin (11) be engaged in the described guide groove (42), flap (2) can cooperate with the metal seat valve (6) on the valve body; It is characterized in that described valve rod (4) also is provided with a claw type near lower end and draws cap (43), described claw type draws two claws of cap (43) to be engaged on the upper end outer circumferential face of described two flaps (2).

2. bidirectional metal sealing ball valve as claimed in claim 1 is characterized in that, the upper end outer circumferential face of described flap is oblique.

3. bidirectional metal sealing ball valve as claimed in claim 1 or 2 is characterized in that, described guide groove (42) has straightway and spiral section.

4. bidirectional metal sealing ball valve as claimed in claim 1 or 2 is characterized in that, the upper end of described valve rod (4) also is provided with one section flow scale that stretches out outside the handwheel (5).

5. bidirectional metal sealing ball valve as claimed in claim 3 is characterized in that, the upper end of described valve rod (4) also is provided with one section flow scale that stretches out outside the handwheel (5).