CN201763962U - Manual stop valve - Google Patents

Abstract

The utility model pertains to valve and in particular to a manual stop valve which is usually mounted in high pressure pipeline for controlling on-off of flow medium in the pipeline. The manual stop valve comprises a valve body, a gland nut, a valve stem and a valve flap inside the inner chamber of the valve body, wherein the gland nut is connected to the valve body, a middle packing being disposed between the valve flap and the inner chamber of the valve body comprising an upper packing, a packing pad and a plurality of middle packings formed by superimposition, the bottom concave camber of the upper packing, the top convex surface of the middle packings, the bottom camber of the middle packings, and the top convex surface of the packing pad being all configured to have a V shape, the top convex surface of the packing pad supporting abut the bottom camber of the middle packings, the top convex surface of the middle packings supporting abut the bottom camber of the upper packing, the bottom of the packing pad being arranged on the step inside the inner chamber of the valve body, bottom of the gland nut pressing on the upper packing, both the included angle of the top convex surface of the middle packings and the included angle of the top convex surface of the packing pad being at a degree between 95 DEG and 105 DEG, both the included angle of the bottom camber of the upper packing and the included angle of the bottom camber of the middle packings being at a degree between 75 DEG and 85 DEG. The utility model can achieve better sealing result under high pressure medium.

Description

Manual shut-off valve

Technical field:

The utility model relates to a valve installed in a pipeline, in particular to a manual cut-off valve used for controlling the on-off of a flow medium flowing in a high-pressure pipeline.

Background technique:

As we all know, globe valve (also called cut-off valve) is the most widely used valve, mainly used for switching, distributing and changing the flow direction of medium. At present, globe valves on the market generally include a rotary handle, a valve stem, a valve body, and a valve disc located in the inner cavity of the valve body. The top of the valve stem is connected to the rotary handle, and the bottom of the valve stem is connected to the top of the valve disc. When the above stop valve is closed, the user needs to rotate the handle to move the valve stem downward, relying on the downward pressure of the valve stem to make the tapered sealing surface at the bottom of the disc close to the medium inlet channel provided in the inner cavity of the valve , to achieve the purpose of preventing the circulation of the medium. During the normal use of the globe valve, in order to prevent the flowing medium from leaking outward along the gap between the disc and the inner cavity of the valve, the existing globe valve is usually equipped with a sealing device between the disc and the inner cavity of the valve. For example, the gasket, although the gasket has a good sealing effect when the medium pressure is low, but for the high-pressure medium, this kind of gasket will be powerless, and the flowing high-pressure medium often flows along the disc and the inner cavity of the valve. The gap between leaks outward.

Utility model content:

The technical problem to be solved by the utility model is to provide a manual shut-off valve which still has good sealing effect under high-pressure medium.

The technical solution of the utility model is to provide a manual shut-off valve with the following structure: it includes a valve body, a gland nut, a valve stem, and a valve flap located in the inner cavity of the valve body, a groove is provided at the bottom of the valve stem, and the valve flap The upper part is located in the groove, and the gland nut is connected to the valve body. Among them, an upper packing, a packing pad and a plurality of stacked middle packings are arranged between the disc and the inner cavity of the valve body. The bottom concave surface of the upper packing, the middle The top convex surface of the filler, the bottom concave surface of the middle filler and the top convex surface of the packing pad are all in an inverted "V" shape. The part is located on the step provided in the inner cavity of the valve body, the bottom of the gland nut is pressed on the upper packing, the angle between the convex surface of the middle packing top and the convex surface of the packing pad top is 95-105°, the angle between the concave surface of the upper packing bottom and the middle packing The included angle of the bottom concave surface is 75-85°.

In the manual shut-off valve described in the utility model, the number of middle fillers can be three.

In the manual shut-off valve described in the utility model, the top of the disc can be provided with a spherical surface, and the spherical surface is in point contact with the inner wall of the groove.

In the manual stop valve described in the utility model, the valve body and packing pad can be made of Monel 400 material, and the valve flap can be made of Monel K500 material.

After adopting the above structure, compared with the prior art, the utility model manual shut-off valve has the following advantages: because the angle between the convex surface of the top of the middle filler and the angle of the convex surface of the top of the packing pad are both 95-105°, and the angle between the concave surface of the bottom of the upper filler is The included angle of the concave surface at the bottom of the filler and the middle filler is 75-85°. In other words, the angle of the convex surface at the top is larger than the concave surface at the bottom. The inflowing high-pressure medium will give an upward force to the packing pad. At this time, the packing pad will move axially and start to squeeze the middle packing, causing the middle packing to produce corresponding radial deformation. The greater the pressure of the high-pressure medium, the greater the pressure of the middle packing. The larger the radial deformation, the tighter and tighter it is, the more effective it is to ensure that the manual stop valve of the present utility model still has a better sealing effect under high-pressure medium.

The setting of the three medium packings can effectively reduce the waste of cost while ensuring the high-pressure sealing effect.

There is a spherical surface on the top of the valve disc, so that when the valve stem pushes the valve disc to move downward, the valve disc will point contact with the inner wall of the groove provided at the bottom of the valve stem under the action of the spherical surface, thereby effectively reducing the contact between the valve disc and the groove. Frictional force when the inner walls of the groove are in contact.

The valve body and packing pad are made of Monel 400 material, and the disc is made of Monel K500 material. Monel 400 material not only has excellent corrosion resistance, but also has strong high pressure resistance.

Description of drawings:

Fig. 1 is a front sectional view of a manual stop valve of the present invention;

Fig. 2 is an enlarged view of "I" in Fig. 1 .

Detailed ways:

The manual cut-off valve of the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments:

As shown in Figures 1 and 2, in this specific embodiment, the utility model manual shut-off valve includes a rotary handle 1, a gland nut 2, a valve body 4, a valve disc 7, a gasket 11, a valve stem 14, a packing pad 8, Upper filler 10 and three middle fillers 9 stacked and pushed together. The valve body 4 is provided with an inner cavity 6, and the lower part of the valve body 4 is provided with an inlet channel 5 for the inflow of medium (not shown in the figure), the upper end of the inlet channel 5 communicates with the inner cavity 6, and the side wall of the valve body 4 has The outlet channel 3 for the medium to flow out, the right end of the outlet channel 3 communicates with the inner cavity 6, the valve disc 7 is located in the inner cavity 6, the bottom of the valve disc 7 is provided with a tapered sealing surface that can be blocked on the top of the inlet channel 5, the valve stem There is a groove 15 at the bottom of 14, the upper part of the valve disc 7 is located in the groove 15, the top of the valve disc 7 is provided with a spherical surface 12, the spherical surface 12 is in point contact with the inner wall of the groove 15, and the valve disc 7 is sequentially covered with gaskets 11, Upper filler 10, three middle fillers 9 and filler pads 8 stacked together. The concave surface at the bottom and the convex surface at the top of the filler pad 8 are in an inverted "V" shape, the convex surface at the top of the filler pad 8 is on the concave surface at the bottom of the bottom middle filler 9, and the convex surface at the top of the uppermost middle filler 9 is on the concave surface at the bottom of the upper filler 10. On the top, the top of the upper packing 10 rests on the bottom of the washer 11, the bottom of the gland nut 2 presses on the washer 11, the gland nut 2 is connected to the upper part of the inner cavity 6 of the valve body 4 through threads, and the included angle B of the convex surface of the top of the middle packing 9 is 100° , the angle D of the convex surface at the top of the packing pad 8 is 100°, the angle A of the concave surface at the bottom of the upper packing 10 is 80°, the angle C of the concave surface at the bottom of the middle packing 9 is 80°, and the lower part of the valve stem 14 is located in the inner cavity of the gland nut 2, The lower part of the valve stem 14 is slidably connected up and down in the inner cavity of the gland nut 2 through threads, and a dust-proof ring 13 is provided between the inner cavity of the gland nut 2 and the valve stem 14, and the rotary handle 1 is connected to the top of the valve stem 14 through a nut . In this specific embodiment, the valve body 4 and the packing pad 8 are both made of Monel 400 material, and the valve disc 7 is made of Monel K500 material.

The working principle of the utility model manual shut-off valve is: when opening, turn the rotating handle 1 to make the valve stem 14 drive the valve disc 7 to move upward, when the conical sealing surface at the bottom of the valve disc 7 leaves the top of the inlet channel 5, the high-pressure flow The medium begins to enter the inner cavity 6 along the inlet channel 5 and finally flows out from the outlet channel 3. After the high-pressure medium enters the inner cavity 6, the high-pressure medium will give an upward force to the packing pad 8. At this time, the packing pad 8 It will move axially and start to squeeze the middle packing 9, causing the middle packing 9 to produce corresponding radial deformation. The greater the pressure of the high-pressure medium, the greater the radial deformation of the middle packing 9, so as to achieve expansion. Tightly seal to prevent the high-pressure flowing medium from leaking along the sealing surface between the valve disc 7 and the inner cavity 6; when closing, turn the rotary handle 1 in the opposite direction, and the valve stem 14 pushes the valve disc 7 to move downward. , the high-pressure medium in the cavity 6 of the valve body 4 will slowly decrease, and when the tapered sealing surface at the bottom of the disc 7 is blocked on the top of the inlet passage 5, the inlet passage 5 and the outlet passage 3 are cut off to complete the closing action.

Claims (4)

1. A manual shut-off valve, comprising a valve body (4), a gland nut (2), a valve stem (14) and a disc (7) positioned in the inner chamber (6) of the valve body (4), the valve The bottom of the rod (14) is provided with a groove (15), the upper part of the valve disc (7) is located in the groove (15), and the gland nut (2) is connected to the valve body (4), which is characterized in that: Between the valve disc (7) and the inner cavity (6) of the valve body (4), there are an upper filler (10), a filler pad (8) and a plurality of stacked middle fillers (9). The bottom concave surface of the filler (10), the top convex surface of the middle filler (9), the bottom concave surface of the middle filler (9) and the top convex surface of the packing pad (8) are all inverted "V" shapes, and the top of the packing pad (8) The convex surface rests on the concave surface at the bottom of the middle filler (9), the convex surface at the top of the middle filler (9) rests on the concave surface at the bottom of the upper filler (10), and the bottom of the filler pad (8) is located in the inner cavity (6) of the valve body (4). ) on the step provided, the bottom of the gland nut (2) is pressed on the upper packing (10), the included angle (B) of the top convex surface of the middle packing (9) and the included angle (B) of the top convex surface of the packing pad (8) ( D) are both 95-105°, and the concave angle (A) at the bottom of the upper filler (10) and the concave angle (C) at the bottom of the middle filler (9) are both 75-85°. 2. The manual shut-off valve according to claim 1, characterized in that: the number of the middle fillers (9) is three. 3. The manual stop valve according to claim 1, characterized in that: the top of the disc (7) is provided with a spherical surface (12), and the spherical surface (12) is in point contact with the inner wall of the groove (15). 4. The manual stop valve according to claim 1, characterized in that: the valve body (4) and packing pad (8) are made of Monel 400 material, and the valve disc (7) is made of Monel Made of K500 material.

Images