CN206386493U - Two-way hard seal spiral valve - Google Patents

Abstract

The utility model discloses two-way hard seal spiral valve, the spiral valve includes bottom, valve body, lower valve rod, ball plate, valve seat, upper valve rod, filler, gland, worm gear case and support；Insulation spacer is provided between bottom and valve body, support is fixed on valve body by bolt, nut, and worm gear case is rack-mount by flange, bearing is provided between upper valve rod and valve body；Spherical structure is used between ball plate and the sealing surface of valve seat；Spiral valve also includes a pressing plate, and pressing plate is responsible for that valve seat is fixed, and pressing plate is fixed through pressing plate and valve body for hexagon socket head cap screw, and cylindrical spring and the first O-ring are provided between valve seat and pressing plate, and the second O-ring is provided between pressing plate and valve body.The utility model is simple in construction, service life length, sealing high, maintenance cost is low.

Description

Two-way hard seal rotary ball valve

technical field

The utility model relates to a rotary ball valve, in particular to a bidirectional hard-sealed rotary ball valve which can be used in working conditions such as an underground pipe network circulating water system, a water purification plant, and a pressurized pump station.

Background technique

Two-way hard-sealed rotary ball valves are widely used in various coal chemical, petrochemical, air separation, underground pipe network and other industries. The products are mainly used in the occasions requiring two-way sealing, such as the outlet of the water pump, the pipe network system, the water recovery system, the high-level sink, the sewage system that is prone to flooding, and the anti-backflow system. It is equivalent to two ordinary one-way valves in the two-way flow system; Now the most practical application is the outlet of the water pump, that is, after the multi-function water pump control valve, because this is the most obvious and most frequent position that requires two-way sealing. In addition to being used for maintenance, some pumps in the pump room are designed in parallel. In the actual production process, there are often conditions that require two-way sealing.

Utility model content

The technical problem to be solved by the utility model is to provide a two-way hard-sealed rotary ball valve which can solve the problem of two-way pressure bearing and short service life of the rotary ball valve.

In order to achieve the above object, the technical scheme of the utility model is as follows:

Two-way hard-sealed rotary ball valve, the rotary ball valve includes a bottom cover, a valve body, a lower valve stem, a ball plate, a valve seat, an upper valve stem, packing, a packing gland, a worm gear box and a bracket; There are insulating gaskets, the bracket is fixed on the valve body through bolts and nuts, the worm gear box is installed on the bracket through the flange, and there is a bearing between the upper valve stem and the valve body; a spherical surface is used between the sealing surface of the ball plate and the valve seat Structure; the rotary ball valve also includes a pressure plate, the pressure plate is responsible for fixing the valve seat, the hexagon socket bolt passes through the pressure plate and the valve body to fix the pressure plate, and a cylindrical spring and the first O-ring are arranged between the valve seat and the pressure plate, and the pressure plate There is a second O-ring between the valve body and the valve body.

In one embodiment of the present invention, the upper valve stem and the ball plate are connected by an inner square or a flat key.

In one embodiment of the present utility model, the ball plate is an eccentric hemispherical plate, and its sealing surface is provided with a hardened coating.

In one embodiment of the present invention, the sealing surface of the valve seat is provided with a hardened coating.

In one embodiment of the present invention, the packing is composed of stainless steel wire, flexible graphite braided packing and flexible graphite ring.

Through above-mentioned technical scheme, the beneficial effect of the utility model is:

The sealing surface of the ball plate adopts a spherical structure, and the ball plate and the valve seat are paired and ground to ensure that the metal sealing surface of the ball plate and the valve seat is 100% tight. Tight specific pressure improves the overall sealing performance; at the same time, the floating valve seat is a replaceable valve seat, which can be disassembled and maintained, which can greatly reduce the maintenance cost of the valve; the cylindrical spring can provide large elastic deformation energy, which can achieve durable Sealing performance.

The valve seat adopts a piston structure. When the valve is closed, no matter whether the medium is at the inlet or outlet, under the action of the medium pressure, the sealing surface between the valve seat and the first O-ring can ensure the sealing between the ball plate and the valve seat. The tight fit guarantees no internal leakage.

The second O-ring seal is used between the valve body and the pressure plate, which has good sealing performance and ensures no external leakage. The surface of the ball plate and valve seat is hardened, which greatly improves its service life.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

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

Figure 2 is a schematic diagram of valve seat installation;

Figure 3 is a schematic diagram of the sealing structure between the valve seat and the ball plate when the medium is at the inlet end;

Figure 4 is a schematic diagram of the sealing structure between the valve seat and the ball plate when the medium is at the outlet;

The corresponding part names indicated by numbers and letters in the figure:

10. Bottom cover 20, valve body 30, lower valve stem 40, ball plate 50, valve seat 60, upper valve stem 70, packing 80, packing gland 90, worm gear box 100, bracket 110, insulating gasket 120, bolt 130 , Nut 140, bearing 150, pressure plate 160, hexagon socket bolt 170, cylindrical spring 180, first O-ring 190, second O-ring.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

Referring to Figures 1 and 2, the utility model discloses a two-way hard-sealed rotary ball valve, comprising a bottom cover 10, a valve body 20, a lower valve stem 30, a ball plate 40, a valve seat 50, an upper valve stem 60, a packing 70, Packing gland 80, worm gear box 90 and bracket 100; the valve body adopts integral casting structure, the inner cavity has a streamlined structure, and there is no middle cavity, which will not cause material accumulation in the valve cavity, and there is no potential hidden danger of the ball plate being stuck. The minimum wall thickness has taken into account the amount of corrosion thinning; the valve stem is supported and positioned by the upper and lower valve stems. The plates are connected by an inner square or a flat key, which can transmit sufficient torque.

The ball plate adopts eccentric hemispherical plate, which can cut off the medium, and has the advantages of light weight, small valve torque, and labor-saving operation; the sealing surface of the ball plate is processed with high precision, and the sealing surface can be equipped with various hardened coatings, which can effectively extend valve service life.

An insulating gasket 110 is provided between the bottom cover 10 and the valve body 20 to improve safety; the bracket 100 is fixed on the valve body 20 through bolts 120 and nuts 130, the worm gear box 90 is installed on the bracket through a flange, and the upper valve stem There is a bearing 140 between 60 and the valve body 20; the flange adopts ISO5211 standard flange structure, which can be adapted to operating mechanisms such as pneumatic, electric and worm gear boxes.

The packing is composed of stainless steel wire, flexible graphite braided packing and flexible graphite ring. The flexible graphite braided packing is used to ensure the tight connection between the valve stem and the stuffing box, prevent packing extrusion, and keep the valve stem aligned to provide reliable sealing and For longer service life, the packing can also use V-type PTFE packing.

The rotary ball valve also includes a pressure plate 150, which is responsible for fixing the valve seat. The hexagon socket bolt 160 passes through the pressure plate 150 and the valve body 20 to fix the pressure plate 150. A cylindrical spring 170 and a second An O-ring 180, a second O-ring 190 is provided between the pressure plate 150 and the valve body 20; the end surface of the valve seat adopts a cylindrical spring structure, and when the sealing surface of the valve seat is worn, the telescopic function of the cylindrical spring can , automatically compensates for valve seat wear, and can realize long-term online sealing function; a second O-ring is used between the pressure plate and the valve body, which can realize the sealing performance between the pressure plate and the valve body, and prevent the medium in the valve cavity from leaking out of the valve body; Ordinary rotary ball valve, the valve seat of the utility model adopts a floating piston structure valve seat, and replaces the conventional valve seat structure with the valve seat, the first O-ring, the pressure plate, the cylindrical spring, the inner hexagonal bolt and the second O-ring structure , While ensuring the function of the valve seat, the structure is also more stable. The floating piston structure valve seat is adopted, which can be disassembled and maintained to reduce the maintenance cost of the valve.

The valve seat channel of the utility model adopts a streamlined design, which makes the fluid resistance smaller, eliminates structural dead angles, and reduces deposition, and is especially suitable for two-phase fluid media mixed with hard particles.

Referring to Figure 3 and Figure 4, the end of the valve seat adopts the first O-ring 180 structure, which can realize the sealing function of the end of the valve seat: when the medium is at the inlet end, under the force of the medium, through the sealing surface of the valve seat and The area difference of the sealing surface of the first O-ring realizes that the sealing surface of the valve seat is always in close contact with the sealing surface of the ball plate; The difference between the sealing surface of the first O-ring and the sealing surface of the first O-ring realizes that the sealing surface of the valve seat is always in close contact with the sealing surface of the ball plate; in summary, the valve seat can achieve the piston effect function, ensure the stable sealing performance of the valve, and realize two-way pressure bearing function.

Compared with the conical surface sealing structure of the ordinary rotary ball valve sealing surface, the utility model adopts a spherical structure for the ball plate and the seat sealing surface of the rotary ball valve. It has a superior fit to ensure long-term sealing performance.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. two-way hard seal spiral valve, it is characterised in that the spiral valve include bottom, valve body, lower valve rod, ball plate, valve seat, on Valve rod, filler, gland, worm gear case and support；Insulation spacer is provided between bottom and valve body, support passes through bolt, spiral shell Mother is fixed on valve body, and worm gear case is rack-mount by flange, and bearing is provided between upper valve rod and valve body；Ball plate and valve seat Sealing surface between use spherical structure；Spiral valve also includes a pressing plate, and pressing plate is responsible for that valve seat is fixed, hexagon socket head cap screw Pressing plate is fixed through pressing plate and valve body, cylindrical spring and the first O-ring, pressing plate and valve body are provided between valve seat and pressing plate Between be provided with the second O-ring.

2. two-way hard seal spiral valve according to claim 1, it is characterised in that used between upper valve rod and the ball plate Interior four directions or flat key connection.

3. two-way hard seal spiral valve according to claim 1, it is characterised in that the ball plate is eccentric semi-spherical plate, its Sealing surfaces are provided with hardening coat.

4. two-way hard seal spiral valve according to claim 1, it is characterised in that the sealing surfaces of the valve seat are provided with hard Change coating.

5. two-way hard seal spiral valve according to claim 1, it is characterised in that the filler by stainless steel metal wire, Soft graphite braided packing and soft graphite ring group into.