CN201714994U - Y-type stop valve - Google Patents

Abstract

The utility model belongs to the technical field of valves, in particular to a Y-shaped stop valve suitable for high-pressure and large-diameter pipelines. The utility model comprises a valve body, the bottom of the valve body is provided with inlet and outlet passages for the circulation of the medium; the upper part of the valve body is connected with a valve cover; The upper end of the valve stem is connected with a transmission mechanism; the inlet passage, the outlet passage and the valve stem form a Y-shaped structure; the outlet of the outlet passage is provided with a valve seat for supporting the valve disc; the characteristic is that the shaft of the valve stem The angle between the centerline and the axial centerline of the inlet and outlet passages is 45-70°, and a support arm is transitionally formed at the junction of the pipe wall of the outlet passage and the inlet passage, The support arm is perpendicular to the valve seat. The utility model effectively reduces the deformation of the sealing part of the valve seat, can fully meet the requirements of high-pressure and large-diameter pipelines, and greatly expands the application range of the stop valve.

Description

A Y-type globe valve

technical field

The utility model belongs to the technical field of valves, in particular to a Y-shaped stop valve suitable for high-pressure and large-diameter pipelines.

Background technique

Globe valves are forced sealing valves, which refer to valves whose opening and closing parts can move along the centerline of the valve seat; wherein, the opening and closing parts can be set as plug-shaped discs. The closing principle of the valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the valve seat fit closely to prevent the flow of medium. During the opening and closing process of the globe valve, the friction force between the valve seat and the disc sealing surface is small, and the mechanical wear is also small, so it has good sealing performance and long service life, so it has been widely concerned and applied. piping systems in many fields.

At present, the disc of the commonly used globe valve is applied perpendicular to the direction of the pipeline (as shown in Figure 1), so the torque of the switch is relatively large, and it is often only applicable to pipelines with a smaller diameter of DN≤400. However, globe valves are also required for high-pressure or high-temperature large-diameter pipelines, but at this time a large torque is required to realize the opening and closing of the globe valve. If you still choose a globe valve with the disc perpendicular to the direction of the pipeline, Under high pressure, when the valve is closed, the pressure acts vertically on the valve disc and the valve seat. Because the valve seat is a ring-shaped cantilever pressure-bearing structure, the valve seat is not located at the bottom because the outlet is a cavity after being pressurized. The direct structure supports and strengthens it, so there is a radial deformation zone from the center to the periphery, and the sealing seat of the valve body will also generate a large stress accordingly, resulting in serious deformation of the sealing part, thus affecting the globe valve. of tightness.

In the prior art, Chinese patent CN101435517A discloses a Y-shaped valve, which includes a valve body, a valve seat, a valve cover, a valve disc, a valve stem, a transmission mechanism, a seal and a mounting part, and a medium inlet is arranged in the valve body. For the outlet channel, the sealing surface of the valve seat of the valve is inclined at an angle relative to the axis of the medium inlet and outlet channel of the valve body, and the valve stem and the axis of the medium inlet and outlet channel of the valve body form a Y-shaped structure. In this technology, the medium inlet channel in contact with the sealing surface of the valve seat is located on one side of the bottom end of the valve body, which adopts a direct angle transition, so that when the valve is closed, due to the In the direction of the sealing surface, the inlet channel has no force support, and the pressure acting on the valve disc or seat has no supporting point that can be decomposed, so the pressure acting on the valve disc or valve seat is still very high in a high-pressure environment. Large, it is easy to cause deformation of the valve seat, thus affecting the overall sealing performance of the valve body.

In addition, this technology also sets a certain angle between the sealing surface of the valve seat and the axis of the inlet and outlet channels of the valve body, thereby reducing the medium flow resistance and pressure loss, but not all angles can be effectively realized for high-pressure environments. The purpose of alleviating the pressure deformation of the lower valve seat is not realized in this technology, let alone further research, so it does not further disclose the valve seat seal that can effectively relieve the pressure deformation of the valve seat The angle between the surface and the axis of the inlet and outlet channels of the valve body.

Utility model content

The first technical problem to be solved by the utility model is that the inlet channel of the globe valve in the prior art has no power support in the direction perpendicular to the sealing surface of the valve seat, and acts on the valve flap or the valve seat. There is no support point that can be decomposed under the pressure, which will easily lead to deformation of the valve seat, and then provide a globe valve that can vertically decompose and support the pressure acting on the valve disc or valve seat to prevent the valve seat from being deformed by force .

The second technical problem to be solved by the utility model is to further study the angle set between the valve seat sealing surface of the Y-shaped valve body in the prior art and the axis of the valve body inlet and outlet channel, and then provide a realizable The valve body design relieves the pressure deformation damage of the valve seat.

In order to solve the above problems, the Y-type stop valve of the present invention includes a valve body, and an inlet channel and an outlet channel for accommodating medium circulation are formed at the bottom of the valve body;

A valve cover is connected to the upper part of the valve body;

A valve stem is provided inside the valve body and through the valve cover, a valve flap is connected to the bottom end of the valve stem, and a transmission mechanism is connected to the upper end of the valve stem, and the transmission mechanism drives the The lift of the valve stem enables the valve clack to open and close the valve;

The inlet passage, the outlet passage and the valve stem form a Y-shaped structure;

A valve seat for supporting the valve disc is formed at the outlet of the outlet channel;

The included angle between the axial centerline of the valve stem and the axial centerline of the inlet and outlet passages is 45-70°, and transitions between the pipe wall of the outlet passage and the inlet passage A section of support arm is formed, and the support arm is perpendicular to the valve seat.

The included angle between the axial centerline of the valve stem and the axial centerline of the inlet and outlet channels is 60°.

The beneficial effects of the utility model are:

(1) In the Y-type stop valve described in the utility model, a section of support arm is transitionally formed at the junction of the pipe wall of the outlet channel and the inlet channel, and the support arm is perpendicular to the valve seat, Therefore, the support of the support arm can be used to decompose the force, so that when the valve disc is closed, a force support is provided for the inlet channel in the direction perpendicular to the sealing surface of the valve seat, and the force acting on the valve disc or valve seat is supported. The pressure on the seat is decomposed and supported, so even in a high-pressure environment, the valve seat will not be deformed due to the high pressure acting on the valve disc or the valve seat, thus ensuring the overall sealing of the globe valve as a whole.

In addition, the Y-type globe valve described in the present invention, through continuous research by the inventor, found that when the angle between the axial centerline of the valve stem and the axial centerline of the inlet and outlet channels is 45 At -70°, when the valve disc is closed, most of the decomposition force of the pressure acting vertically on the sealing surface of the valve seat acts on its support arm, and only a small part acts on the outlet channel corresponding to the support arm. On the wall of the connected pipe, so as not to exert a large pressure on the outlet channel, so as to fully meet the needs of high-pressure and large-diameter pipelines, and greatly expand the application range of the globe valve.

(2) For the Y-type globe valve described in the present utility model, the flange connection setting between the connection positions is taken into consideration when the valve is set, and the problem of exerting pressure on the outlet channel as described in the above point (1) is considered Preferably, the angle between the axial centerline of the valve stem and the axial centerlines of the inlet and outlet channels is set to be 60°, which can better reduce the pressure on the outlet channel.

Description of drawings

In order to make the content of the utility model easier to understand clearly, the utility model will be described in further detail below according to specific embodiments of the utility model in conjunction with the accompanying drawings, wherein

Fig. 1 is the structure diagram of the cut-off valve of existing T-type valve body structure;

Fig. 2 is a structural diagram of the utility model.

The reference signs in the figure are expressed as: 1-Y-type valve body, 2-valve seat, 3-bonnet, 4-disc, 5-valve stem, 6-outlet, 7-sealing gasket, 8-support arm, 9- -Seal packing, 10-upper sealing seat, 11-packing gland, 12-packing plate.

Detailed ways

As shown in accompanying drawing 2, the utility model is improved on the basis of the existing T-shaped stop valve. The utility model includes a valve body 1, and the inlet and outlet passages for accommodating medium circulation are formed at the bottom of the valve body 1; a valve cover 3 is connected to the upper part of the valve body 1; The rod 5, the inlet passage, the outlet passage and the valve stem 5 for medium circulation form a Y-shaped structure, and the angle between the axial centerline of the valve stem 5 and the axial centerline of the inlet and outlet passages can be set to 45- Any angle value between 70°; the valve disc 4 is connected to the bottom end of the valve stem 5 through nuts and other connecting parts, and the valve disc 4 can open and close the valve with the rise and fall of the valve stem 5; at the upper end of the valve stem 5 The connection is provided with a transmission mechanism, and the transmission mechanism is an electric transmission device, which is used to drive the valve stem 5 to rise and fall; a valve seat 2 for supporting the valve disc 4 is formed at the outlet 6 of the medium circulation outlet channel; There is a support arm 8 perpendicular to the valve seat 2 at the junction of the pipe wall and the inlet channel; a gasket 7 is provided between the valve cover 3 and the valve body 1, and a sealing packing 9 is provided between the valve stem 5 , the sealing packing 9 is press-fitted by the upper sealing seat 10, the packing gland 11 and the packing pressure plate 12.

When the above-mentioned Y-type globe valve is working, the electric transmission device drives the valve stem 5 connected to it to rise, and the valve disc 4 opens accordingly, and the medium flows in from the inlet channel, and flows to the outlet 6 through the cavity of the valve seat 2. The outlet channel; when the installed pipeline needs to cut off the flow of medium, the electric transmission device drives the valve stem 5 to descend, and the valve disc 4 connected to the lower end of the valve stem 5 falls to the valve seat 2 to seal the valve seat 2, Thus a sealing surface is formed at the valve seat 2. At this time, the medium that has flowed into the inlet passage is blocked in the inlet passage because it cannot pass through the cavity of the valve seat 2, that is, the outlet 6. At this time, the medium described in the utility model There is no medium flow in the pipeline where the Y-type globe valve is installed.

When the valve disc 4 closes and shuts off the flow with the descending of the valve stem 5, the water pressure in the pipeline and the self-sealing pressure of the valve disc 4 act on the valve seat 2 at the same time. Since the support arm 8 is perpendicular to the valve seat 2, the valve seat 2. The force direction of the lower part is parallel to the support arm 8, and the force end directly acts on the part close to the lower cavity wall of the Y-shaped valve body 1. The support arm 8 strengthens the rigid support for the valve seat 2, and the inlet of the horizontal pipe There is also a curved support structure at the channel to strengthen the support of the valve seat 2. At this time, the stress is mostly absorbed by the annular body wall of the lower cavity wall of the valve, which greatly reduces the deformation caused by the cantilever structure when the pressure is too high. Therefore, the deformation of the sealing part of the valve seat 2 is greatly reduced, effectively ensuring good sealing accuracy of the utility model, and fully meeting the requirements of high-pressure and large-diameter pipelines.

As a preferred embodiment that can be changed, the Y-shaped globe valve described in the utility model can choose to set the angle between the axial centerline of the valve stem and the axial centerline of the inlet and outlet passages to be 60° , so as to ensure that the flange connection between the connection positions is smooth when the globe valve is working, and at the same time ensure that when the valve disc is closed, the pressure decomposition force acting vertically on the sealing surface of the valve seat acts on its support arm, which can be more Good pressure relief on the outlet channel.

The structural points of the Y-type stop valve described in the utility model can be applied to the self-sealing stop valve of the largest high-pressure large-caliber stop valve 24 inches (DN600mm)·900 pounds (15.0MPa) developed in China at present. It is proved that it can effectively improve the deformation of the sealing part, and the sealing performance is good.

The utility model is not limited to the above-mentioned embodiments. For those skilled in the art, any obvious improvement or change made to the above-mentioned embodiments of the present utility model will not exceed the scope of the utility model shown by way of example only. Examples and scope of protection of the appended claims.

Claims (2)

1. A Y-type shut-off valve, comprising a valve body (1), formed with an inlet channel and an outlet channel to accommodate medium circulation at the bottom of the valve body (1); A valve cover (3) is connected to the upper part of the valve body (1); A valve stem (5) is provided inside the valve body (1) and through the valve cover (3), and a valve disc (4) is connected to the bottom end of the valve stem (5). The upper end of the rod (5) is connected with a transmission mechanism, and the transmission mechanism drives the lifting of the valve rod (5), so that the valve clack (4) can open and close the valve; The inlet passage, the outlet passage and the valve stem (5) form a Y-shaped structure; A valve seat (2) for supporting the valve disc (4) is formed at the outlet (6) of the outlet channel; It is characterized by: The included angle between the axial centerline of the valve stem (5) and the axial centerline of the inlet and outlet passages is 45-70°, on the pipe wall of the outlet passage and the inlet passage A section of support arm (8) is transitionally formed at the joint, and the support arm (8) is perpendicular to the valve seat. 2. The Y-shaped stop valve according to claim 1, characterized in that: the angle between the axial centerline of the valve stem (5) and the axial centerline of the inlet and outlet channels is 60°.

Images