CN103322213A

CN103322213A - Center glue-lined butterfly valve for medium-pressure pipeline

Info

Publication number: CN103322213A
Application number: CN201310280118XA
Authority: CN
Inventors: 杨元亭
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-05
Filing date: 2013-07-05
Publication date: 2013-09-25

Abstract

The invention discloses a center glue-lined butterfly valve for a medium-pressure pipeline. The center glue-lined butterfly valve comprises a valve body, a valve stem and a rubber valve seat. A valve plate is arranged inside the valve body, an upper shaft hole and a lower shaft hole are formed on the inner surface inside the valve body, the lower shaft hole is a blind hole, and the valve stem penetrates the upper shaft hole, the valve plate and the lower shaft hole; the lower edge of the upper shaft hole and the upper edge of the lower shaft hole on the inner surface of the valve body are respectively directly connected with the vulcanized-rubber valve seat, a contact surface of the rubber valve seat and the valve plate is an arc surface, the surface on the other side of the arc surface of the rubber valve seat is provided with limit protrusions, at least two lugs are arranged at a joint of the outer surface on two sides of the rubber valve seat and flanges, and two annular protrusions are arranged on the inner circumferential surface of a stem mounting hole of the rubber valve seat. By the unique design of the center glue-lined butterfly valve, a pressure range of a conventional center glue-lined butterfly valve is broken through, so that the application of the center glue-lined butterfly valve is extended to a medium-pressure field of 2.5Mpa.

Description

A kind of center line butterfly valve for pressure pipeline

Technical field

The present invention relates to the valve arrangement field, more particularly, relate to a kind of center line butterfly valve for pressure pipeline.

Background technique

Center line butterfly valve nominal pressure traditional on the market is no more than 1.6Mpa, and along with the progress of science and technology, pipeline pressure further improves, and existing low pressure butterfly valve product can not satisfy user's demand.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of center line butterfly valve for pressure pipeline is provided.

A kind of center line butterfly valve for pressure pipeline of the present invention, be achieved by following technical proposals, comprise valve body, valve rod and rubber valve seat, valve plate is set in the valve body, upper gland and bottom axis hole are set in the valve body, described bottom axis hole is blind hole, and valve rod passes upper gland, valve plate and bottom axis hole successively; The top edge of the lower limb of valve interior surface upper gland and bottom axis hole is direct vulcanized rubber valve seat respectively, the surface of contact that rubber valve seat contacts with valve plate is arc surface, rubber valve seat arc surface opposite side surface arranges spacing preiection, valve seat bi-side outer surface and flange connections arrange at least twice flange, and the valve rod mounting hole inner peripheral surface of valve seat arranges two annular projections.

Valve body is wafer type valve body or lug type valve body.

The top of valve body neck is the inverted cone shape, and the bottom of valve body neck is the frustum shape.

Valve rod and valve plate pass through spline joint.The valve stem part diameter of spline lower end is less than the valve stem part diameter of spline upper end.

The center line butterfly valve that is used for pressure pipeline axially prevents blowing out the form that structure adopts U-shaped split washer and gland to be connected by screw.

Compared with prior art, the invention has the beneficial effects as follows:

(1) traditional center line butterfly valve nominal pressure is no more than 1.6Mpa on the market, progress along with science and technology, pipeline pressure further improves, existing low pressure butterfly valve product can not satisfy user's demand, the present invention is by unique design, broken through the pressure range of traditional center line butterfly valve, so that the application extension of center line butterfly valve has reached 2.5 Mpa to middle pressure field.

(2) valve body adopts wafer type or lug type valve body, and valve body neck portion design top is inverted cone, is convenient to drive unit and is connected with the bolt of upper flange; The bottom is designed for frustum, has on the one hand enough spaces to arrange the valve body typefounding, has strengthened on the other hand the join strength of neck and valve body; The valve body lower portion axis hole designs for blind hole, reduces leakage point.

(3) the general employing of the combination of traditional center line butterfly valve valve body and valve seat has skeleton or exoskeletal line with rubber removable valve stand structure, bears pressure low; Rubber valve seat of the present invention adopts directly sulfuration to the mode of valve body, and intermediate portion design spacing preiection, has increased bonded area, has strengthened combination force, has guaranteed normally to use under the pressure of 2.5 Mpa.

(4) valve seat bi-side and flange connections have the multiple tracks flange, when compressing with pipeline coupling flange, form the vacuum seal endless belt between flange and flange, guarantee sealing effect; The valve rod mounting hole of valve seat is provided with several annular projections, and is multiple-sealed, improved pressure-bearing and the sealability of butterfly valve.

(5) sealing means of traditional centre-pivoted butterfly valve butterfly plate sealing surface and end face and valve base sealing band is generally plane and plane contact sealing, rely on the compressive strain of valve seat rubber to guarantee sealing effect, when nominal pressure increases, for reaching sealing effect, will significantly increase the valve seat decrement, the keying moment of butterfly valve is increased, and the sealing surface wear aggravation of valve seat and valve plate causes descend the working life of butterfly valve; Butterfly valve butterfly plate of the present invention and sealing surface of seat are through precision machined arc surface, on the one hand in opening-closing process valve plate level and smooth enter valve seat arc surface sealing strip, reduce the keying moment of butterfly valve, on the other hand, under the closed condition, when valve plate is under pressure, to a microdisplacement be arranged in the pressurized direction, so that the decrement of valve seat further increases, therefore, this structure can guarantee in the situation that the smaller sealing effect under 2.5Mpa pressure of valve seat decrement.

(6) traditional centre-pivoted butterfly valve valve rod and valve plate be connected to being connected of pin or right angle square key, connecting precision can not guarantee, causes in addition the diameter of valve rod large; Valve rod of the present invention and valve plate be connected to spline joint, connect precision high, transmitting torque is large, and has guaranteed the valve stem part diameter of valve rod spline lower end, pressure-bearing improves.

(7) traditional centre-pivoted butterfly valve is generally the design of double stub shaft, the bad assurance of accuracy of alignment, and valve rod of the present invention is the design of single valve bar, integral rigidity is good.

(8) axially anti-to blow out structure be shaft block ring, pad, hole to traditional centre-pivoted butterfly valve with the form of back-up ring combination, the circlip groove processed complex, after installing axially gap length can not control; The form that the present invention has adopted U-shaped split washer and gland to be connected by screw, easy for installation, processing is simple, and is large with the valve body join strength, and anti-blowing out acts on obviously.

Description of drawings

Fig. 1 is butterfly valve plan view of the present invention;

Fig. 2 is butterfly valve side view of the present invention;

Fig. 3 is the partial enlarged drawing at A place among Fig. 2;

Fig. 4 is butterfly valve plan view of the present invention;

Fig. 5 is valve body vulcanized rubber valve seat schematic diagram;

Fig. 6 is sealing surface of seat circular arc and flange schematic diagram;

Fig. 7 is the partial enlarged drawing of B place valve rod mounting hole among Fig. 5;

Fig. 8 is the split washer schematic diagram.

Among the figure:

1. gland 2. split washers 3. splines 4. short sleeves 5. valve rods

6. valve body 7. major axis overlap 8. rubber valve seat 8-1. the first flange

8-2. the second flange 8-3. the 3rd flange 8-4. spacing preiection

8-5. arc surface 8-6. annular projection

9. valve plate 10. Lower shaft sleeves 11. screws

12. cone shape 13. frustum shapes.

Embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

Shown in Fig. 1-2, a kind of center line butterfly valve for pressure pipeline, comprise valve body 6, valve rod 5 and rubber valve seat 8, valve plate 9 is set in the valve body, upper gland and bottom axis hole are set in the valve body, and (two ends arrange respectively major axis cover 7 and short sleeve 4 in the upper gland, Lower shaft sleeve 10 is set in the axis hole of bottom), described bottom axis hole is blind hole, valve rod passes upper gland, valve plate and bottom axis hole successively; The top edge of the lower limb of valve interior surface upper gland and bottom axis hole is direct vulcanized rubber valve seat respectively, as shown in Figure 6, the surface of contact that rubber valve seat contacts with valve plate is arc surface 8-5, rubber valve seat arc surface opposite side surface arranges spacing preiection 8-4, valve seat bi-side outer surface and flange connections arrange at least the twice flange and (are illustrated as three road flanges: the first flange 8-1, the second flange 8-2, the 3rd flange 8-3), as shown in Figure 7 (Fig. 7 is the partial enlarged drawing of B place valve rod mounting hole among Fig. 5), the valve rod mounting hole inner peripheral surface of valve seat arranges two annular projection 8-6.

Valve body is wafer type valve body or lug type valve body.As shown in Figure 1, the top of valve body neck is inverted cone shape 12, and the bottom of valve body neck is frustum shape 13.Valve body neck portion design top is inverted cone, is convenient to drive unit and is connected with the bolt of upper flange; The bottom is designed for frustum, has on the one hand enough spaces to arrange the valve body typefounding, has strengthened on the other hand the join strength of neck and valve body; The valve body lower portion axis hole designs for blind hole, reduces leakage point.

As shown in Figure 2, valve rod is connected by spline 3 with valve plate.The valve stem part diameter of spline lower end is less than the valve stem part diameter of spline upper end.Spline joint connects precision high, and transmitting torque is large, and has guaranteed the valve stem part diameter of valve rod spline lower end, and pressure-bearing improves.

The center line butterfly valve that the is used for pressure pipeline axially anti-A place that blows out among structure such as Fig. 2 is namely shown in Figure 3, adopts U-shaped split washer 2 to see Fig. 4 with gland 1 by screw 11() form that is connected, U-shaped split washer is as shown in Figure 8.Easy for installation, processing is simple, and is large with the valve body join strength, and anti-blowing out acts on obviously.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. a center line butterfly valve that is used for pressure pipeline is characterized in that, comprises valve body, valve rod and rubber valve seat, valve plate is set in the valve body, upper gland and bottom axis hole are set in the valve body, and described bottom axis hole is blind hole, and valve rod passes upper gland, valve plate and bottom axis hole successively; The top edge of the lower limb of valve interior surface upper gland and bottom axis hole is direct vulcanized rubber valve seat respectively, the surface of contact that rubber valve seat contacts with valve plate is arc surface, rubber valve seat arc surface opposite side surface arranges spacing preiection, valve seat bi-side outer surface and flange connections arrange at least twice flange, and the valve rod mounting hole inner peripheral surface of valve seat arranges two annular projections.

2. the center line butterfly valve for pressure pipeline according to claim 1 is characterized in that, valve body is wafer type valve body or lug type valve body.

3. the center line butterfly valve for pressure pipeline according to claim 1 is characterized in that, the top of valve body neck is the inverted cone shape, and the bottom of valve body neck is the frustum shape.

4. the center line butterfly valve for pressure pipeline according to claim 1 is characterized in that, valve rod and valve plate pass through spline joint.

5. the center line butterfly valve for pressure pipeline according to claim 1 is characterized in that, the valve stem part diameter of spline lower end is less than the valve stem part diameter of spline upper end.

6. the center line butterfly valve for pressure pipeline according to claim 1 is characterized in that, axially prevents blowing out the form that structure adopts U-shaped split washer and gland to be connected by screw.