CN204372191U - A kind of novel cutoff valve - Google Patents

Abstract

The utility model relates to a new cut-off valve, which includes a valve body, a valve stem, a valve seat, a valve cover, a packing structure and a valve core; the connection structure between the valve stem and the valve core is specifically: the valve core is a The spherical body has a cylindrical cavity at the lower end of the valve stem into which the spherical body is embedded, and an arc-shaped groove fitted with the spherical body at the top of the cylindrical cavity. The utility model has the advantages of changing the spool of the stop valve into a spherical body, changing the original conical surface and plane contact form of the sealing surface into spherical contact, and the ball is outsourced by the valve stem, and the ball can be freely 360° at the head of the valve stem. ° Rotation, when the valve is in small opening, the floating ball rotates to avoid the erosion of the sealing surface by the medium. Since the sealing surface is in the form of a spherical surface, the ball can be sealed in any state of 360°.

Description

A New Type of Globe Valve

technical field

The utility model relates to a shut-off valve, in particular to a novel shut-off valve which reduces the erosion of the sealing surface by the medium.

Background technique

The opening and closing part of the stop valve (Globe Valve) is a plug-shaped valve disc, the sealing surface is flat or sea-cone, and the valve disc moves linearly along the centerline of the valve seat. The movement form of the valve stem, (common name: dark rod), also has a lifting and rotating rod type that can be used to control various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. flow. Therefore, this type of shut-off valve is very suitable for cutting or regulating and throttling. Because the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for flow adjustment.

At present, for the globe valves in use in the market, when the valve is just opened, the pressure of the medium flowing through is the largest, and at the same time, the erosion of the sealing surface of the valve is relatively large, especially when encountering high-pressure medium, it is easier It will cause damage to the sealing surface of the valve and affect the sealing effect; in addition, the connection between the valve body and the bracket is usually a threaded connection, and the globe valve using this connection method is in the process of working. It is prone to seizure under high pressure, and it is prone to deformation under high pressure.

Utility model content

The technical problem to be solved by the utility model is to provide a new cut-off valve that reduces the erosion of the medium on the sealing surface.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is: a new type of globe valve, the innovation point of which is: including a valve body, a valve stem, a valve seat, a valve cover, a packing structure and a valve core;

The valve cover is located at the upper end of the valve body and matches with the valve body. A valve seat is installed in the valve body, and a bracket is set on the outer end of the valve body; the valve stem extends into the inner cavity of the valve body from top to bottom, In addition, a packing structure is provided between the valve stem and the inner cavity of the valve body, and a valve core is connected to the lower end of the valve stem, and the sealing surface of the valve core and the sealing surface of the valve seat form a sealing pair;

The connection structure between the valve stem and the valve core is specifically: the valve core is a spherical body, and there is a cylindrical cavity at the lower end of the valve stem to accommodate the spherical body, and at the same time, at the top of the cylindrical cavity It has an arc-shaped groove that fits the spherical body.

Further, the spherical body is flexibly connected with the valve stem, and can be rotated by 360°.

Further, the bracket is connected with the valve body through a split ring, and is tightened and fixed by set screws.

Further, the connection structure between the bracket and the valve body is as follows: at the upper end of the valve body, there is a ring-shaped groove A that accommodates the split ring, and at the same time, there is a ring-shaped groove A corresponding to the split ring on the bracket. Circular groove B.

The utility model has the advantages of changing the spool of the stop valve into a spherical body, changing the contact form of the original conical surface and the plane of the sealing surface into a spherical contact, and the ball is outsourced by the valve stem, and the ball can be freely 360° at the head of the valve stem. ° rotation, when the valve is in a small opening, the floating ball rotates to avoid the erosion of the medium on the sealing surface. Since the sealing surface is in the form of a spherical surface, the ball can be sealed in any state of 360°; the connection between the valve body and the bracket The thread structure is changed to a split ring structure, which effectively prevents the thread from being seized at high temperature and deformed under high pressure, and can realize quick assembly and disassembly.

Description of drawings

Fig. 1 is the schematic diagram of the novel shut-off valve of the present utility model.

Detailed ways

As can be seen from the schematic diagram shown in FIG. 1 , the novel shut-off valve of the present invention includes a valve body 9, a valve stem 7, a valve seat, a valve cover, a packing structure and a valve core.

The valve cover is located at the upper end of the valve body 9, and is matched with the valve body 9. A valve seat is installed in the valve body 9, and the valve stem 7 extends into the inner chamber of the valve body 9 from top to bottom, and between the valve stem 7 and the valve A packing structure is also provided between the inner chambers of the body 9, and a valve core is connected to the lower end of the valve stem 7, and the sealing surface of the valve core and the sealing surface of the valve seat form a sealing pair.

The connection structure between the valve stem 7 and the valve core is specifically: the valve core is a spherical body 8, and there is a cylindrical cavity in which the spherical body 8 is embedded at the lower end of the valve stem 7, and at the same time, at the top of the cylindrical cavity There is an arc-shaped groove fit with the spherical body 8 .

The spherical body 8 is flexibly connected with the valve stem 8, and the spherical body 8 can freely rotate 360°. When the valve is in the small open state, the spherical body 8 rotates to avoid the erosion of the sealing surface of the valve seat by the medium. In addition, when sealing, because the valve core adopts a spherical structure, it can be in any state of 360° Lower seal.

The specific packing structure is as follows: a packing cavity is provided between the valve stem 7 and the inner cavity of the valve body 9, the packing cavity is filled with packing 3, the upper end of the packing 3 is fixed by the packing gland 2, and the packing gland One end of 2 is provided with a through hole for the tie rod bolt 4 to pass through. After the tie rod bolt 4 passes through the through hole, it is fixed with a nut to compress the packing 3. There is also a packing between the lower end of the packing 3 and the valve body 9. Pad 6.

The bracket 1 is sleeved on the outer end of the valve body 9 , and the bracket 1 and the valve body 9 are connected through a split ring 10 , and are tightened and fixed by a set screw 5 .

The connection structure between the bracket 1 and the valve body 9 is as follows: on the upper end of the valve body 9 there is a ring-shaped groove A that accommodates the split ring 10 to be embedded; The circular groove B.

In the process of installing the bracket 1, firstly, the bracket 1 is set on the outer end of the valve body 9, and then the split rings 10 are respectively inserted into the annular grooves A of the valve body 9, and then the bracket 1 is pulled upwards, and the The annular groove B on the bracket 1 is close to the outer surface of the split ring 10, and finally the set screw 5 on the bracket 1 is tightened to complete the assembly.

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 (4)

1. a novel cutoff valve, is characterized in that: comprise valve body, valve rod, valve seat, valve gap, filling-material structure and spool;

Described valve gap is positioned at the upper end of valve body, and match with valve body, in valve body, valve seat is installed, a support is set with in the outer end of valve body, described valve rod stretches in the inner chamber of valve body from top to bottom, and also filling-material structure is provided with between valve rod and body cavity, be connected with spool in the lower end of valve rod, the sealing surface of described spool and the sealing surface of valve seat form sealing pair;

Linkage structure between described valve rod and spool is specially: described spool is a spherosome, has the cylindrical cavity that an appearance spherosome embeds in the lower end of valve rod, has the circular groove fitted with spherosome on the top of this cylindrical cavity simultaneously.

2. novel cutoff valve according to claim 1, is characterized in that: described spherosome is flexibly connected with between valve rod, and can carry out 360 ° of rotations.

3. novel cutoff valve according to claim 1, is characterized in that: described support is connected by divided ring with between valve body, and is tightened fixing by Cock screw.

4. novel cutoff valve according to claim 3, it is characterized in that: the linkage structure between described support and valve body is specially: there is in the upper end of valve body the circle shape groove A that an appearance divided ring embeds there is a circle shape groove B corresponding with divided ring on support simultaneously.