CN205226401U - Rubber valve seat butterfly valve - Google Patents

Abstract

The utility model discloses a butterfly valve with a rubber valve seat, which is characterized in that it comprises a cast iron valve body, a rubber valve seat, a cast iron valve plate, and a through-shaft valve shaft, and the sealing surface of the cast iron valve plate is provided with a stainless steel layer , the stainless steel layer is an overall spherical surface. The utility model designs the sealing surface of the rubber seat butterfly valve into an integral spherical shape, which can effectively reduce the sealing torque. At the same time, the sealing surface is made of ductile iron with stainless steel attached to form a sealing pair with the rubber valve seat. The stainless steel has the characteristics of wear resistance and small friction coefficient, thereby reducing the sealing torque of the valve. The reduction of the sealing torque of the valve also reduces the driving device. Low cost, energy saving, can be widely used in the water industry, is a powerful guarantee for safe water use.

Description

Rubber Seat Butterfly Valve

technical field

The utility model relates to the technical field of valves, in particular to a rubber valve seat butterfly valve.

Background technique

In the prior art, the seat and the butterfly plate of the traditional butterfly valve mostly use the inner plane fit of the cylinder. There are certain disadvantages in the matching method of this structure: the fit between the butterfly plate and the valve seat cannot be too tight, if the fit is too tight , The valve switch is very difficult. If no force is used, it is difficult to open the valve or completely close the valve, and if the valve is closed by force, the butterfly plate is easily deformed and damaged. However, if the disc does not fit tightly enough with the valve seat, leakage will easily occur.

Utility model content

The purpose of the utility model is to provide a rubber seat butterfly valve aiming at the technical defects existing in the prior art.

The technical scheme adopted for realizing the purpose of this utility model is:

A butterfly valve with a rubber valve seat, characterized in that it includes a cast iron valve body, a rubber valve seat, a cast iron valve plate, and a through-shaft valve shaft, the sealing surface of the cast iron valve plate is provided with a stainless steel layer, and the stainless steel The layer is a whole spherical surface.

The cast iron valve plate is ductile iron.

The cast iron valve plate is spray-welded with the stainless steel layer described in nodular cast iron, and the thickness of the stainless steel layer is 0.2mm-0.25mm.

The upper end of the valve shaft passes through the upper valve port of the valve body and is connected with the control mechanism through a key to realize the opening of the cast iron valve plate. Sealing, the lower packing is positioned in the inner seam of the upper valve port by the guide cylinder fixedly connected to the valve body, the upper end of the guide cylinder is provided with an inner seam type stuffing box, and the stuffing box is provided with an upper The packing is positioned relative to the valve body by a snap ring.

A lower shaft sleeve is provided between the lower end of the valve shaft and the lower valve port of the valve body, and an inner stop is formed at the lower end of the lower valve port of the cast iron valve body, and a sleeve is arranged in the inner stop. The combined sealing ring at the lower end of the valve shaft realizes the bottom seal, and the combined sealing ring is squeezed and positioned by the back plug fixedly connected with the valve body through the packing pressure ring.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model designs the sealing surface of the rubber seat butterfly valve into an integral spherical shape, which can effectively reduce the sealing torque. At the same time, the sealing surface is made of ductile iron with stainless steel attached to form a sealing pair with the rubber valve seat. The stainless steel has the characteristics of wear resistance and small friction coefficient, thereby reducing the sealing torque of the valve. The reduction of the sealing torque of the valve also reduces the driving device. Low cost, energy saving, can be widely used in the water industry, is a powerful guarantee for safe water use.

Description of drawings

Shown in Fig. 1 is the structural representation of rubber valve seat butterfly valve of the present utility model;

FIG. 2 is a schematic diagram of the cross-sectional structure shown in FIG. 1 .

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figures 1 and 2, the rubber valve seat butterfly valve of the present invention includes a cast iron valve body 2, a rubber valve seat, a cast iron valve plate 8, and a through-shaft valve shaft 3, and the sealing surface of the cast iron valve plate is set There is a stainless steel layer, and the stainless steel layer is an integral spherical surface. The sealing surface includes two sides of the valve plate, an upper top surface corresponding to the upper valve port, and a lower top surface corresponding to the lower valve port, and these four parts are all on the same spherical surface. The sealing surface of the rubber seat butterfly valve is designed as an integral spherical shape, which can effectively reduce the sealing torque.

Preferably, the cast iron valve plate is ductile iron, and the cast iron valve plate is spray-welded with a stainless steel layer as described in ductile iron, and the thickness of the stainless steel layer is 0.2mm-0.25mm. The sealing surface is made of ductile iron with stainless steel attached to form a sealing pair with the rubber valve seat. The stainless steel has the characteristics of wear resistance and small friction coefficient, thereby reducing the sealing torque of the valve. The reduction of the sealing torque of the valve also reduces the cost of the driving device , so as to save energy.

Wherein, the upper end of the valve shaft passes through the upper valve port of the valve body and is connected with the control mechanism through the key 1 to realize the opening of the cast iron valve plate 8. At the same time, a There is a lower packing 4 for sealing. The lower packing 4 is positioned in the inner seam of the upper valve port by a guide cylinder fixedly connected to the valve body. Specifically, the upper end of the guide cylinder is provided with an inner seam type packing The upper packing is arranged in the stuffing box and is positioned by the circlip, that is, the circlip is used to position the stuffing in the stuffing box, and the stuffing in the stuffing box presses the guide cylinder to position the inner stuffing, two-stage While the packing improves the sealing effect, it also reduces the pressure on the positioning mechanism, reduces processing difficulty and design cost.

The valve shaft passes through the central hole of the cast iron valve plate 8 and is fixedly connected with it by a threaded taper pin. In order to further control the sealing torque, a lower bushing 9 is arranged between the lower end of the valve shaft and the lower valve port of the valve body. At the same time, an inner stop is formed at the lower end of the lower valve port of the cast iron valve body 2, and a combined sealing ring 10 sleeved at the lower end of the valve shaft is arranged in the inner stop to realize bottom sealing. The combined sealing ring is squeezed and positioned by the back plug 13 fixedly connected with the valve body through the packing follower 11, and at the same time, a back plug gasket is provided between the back plug 13 and the valve body to seal the two seal.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (5)

1. a rubber valve seat butterfly valve, is characterized in that, comprises cast iron valve body, rubber valve seat, cast iron valve plate, and shaft type valve shaft, and the sealing surface of described cast iron valve plate is provided with stainless steel lining, and described stainless steel lining is overall sphere.

2. rubber valve seat butterfly valve as claimed in claim 1, it is characterized in that, described cast iron valve plate is spheroidal graphite cast iron.

3. rubber valve seat butterfly valve as claimed in claim 1, is characterized in that, described cast iron valve plate for the stainless steel lining surfacing described in spheroidal graphite cast iron, stainless steel lining thickness be 0.2mm ~ 0.25mm.

4. rubber valve seat butterfly valve as claimed in claim 1, it is characterized in that, described valve shaft upper end passes from the upper valve port of valve body and is connected to realize the unlatching of cast iron valve plate by key with operating-controlling mechanism, simultaneously, lower filler is provided with to seal between described cast iron valve shaft and upper valve port, the guide cylinder that described lower filler is fixedly connected with by relative valve body is positioned in the inner stopper of upper valve port, described guide cylinder upper end is provided with inner stopper formula stuffing box, is provided with filler and is located by its relative valve body by jump ring in described stuffing box.

5. rubber valve seat butterfly valve as claimed in claim 4, it is characterized in that, Lower shaft sleeve is provided with between the lower end of described valve shaft and the lower valve port of valve body, inner stopper is formed in the lower valve port underpart of described cast iron valve body, be provided with in described inner stopper be set in valve shaft lower end combined seal ring to realize sealed bottom, described combined seal ring carries out extruding by the rear blanking cover be fixedly connected with valve body by filler pressing and locates.