Straight-through type manual stop valve

Abstract

A straight-through type manual stop valve comprises a straight-through type valve body, a valve element, a driving rod, a pressing sleeve nut, a packing pressing sleeve, a combined sealing assembly and a packing pad. A combined sealing assembly is arranged between the valve element and the valve body and comprises a plurality of sealing pieces matched with one another, the sealing pieces are matched in a V shape, so that a plurality of sealing faces are formed, the sealing effect is improved, the sealing materials are made of high-purity polytetrafluoroethylene materials, and therefore the sealing effect is improved. The composite material has excellent corrosion resistance, high temperature resistance and low temperature resistance, and is widely applied to special industries, such as toxic media, corrosive media, high-temperature media and low-temperature media.

Description

Technical Field

[0001] The utility model relates to the field of mechanical valves, and in particular to a straight-through manual stop valve for opening and closing a medium channel, which can be used in special industries to switch toxic media, corrosive media, high-temperature media and low-temperature media. Background Art

[0002] Straight-through stop valves are suitable for cutting off or connecting pipeline media in various industries and working conditions. In some environments, straight-through stop valves can be used to cut off or connect pipeline media in various working conditions such as petroleum, chemical, pharmaceutical, fertilizer, electricity, recycling equipment, gas supply, cooling and refrigeration systems, boiler steam systems, hot oil systems, etc. with nominal pressure PN1.6~35.0Mpa and working temperature -200~200℃.

[0003] However, the working environment in the above fields is relatively harsh, with high pressure and often corrosive. The straight-through stop valve in the prior art often leaks due to excessive pressure and insufficient sealing performance, and the sealing medium is easily corroded due to the strong corrosiveness of the pipeline medium, which further increases the risk of leakage.

[0004] Therefore, how to increase the corrosion resistance of the manual stop valve and improve the sealing performance has become a technical problem that urgently needs to be solved in the prior art. Utility Model Content

[0005] The utility model aims to provide a straight-through manual stop valve, which has excellent sealing performance and has the function of stop and anti-seepage.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A straight-through manual stop valve, comprising:

[0008] Straight-through valve body, valve core, drive rod, gland nut, packing gland, combined sealing assembly, and packing gasket;

[0009] The straight-through valve body has two substantially parallel valve body medium channels, and a valve core hole is provided inside the straight-through valve body to accommodate the valve core. The upper part of the valve core hole has an internal thread, the middle part has a sealing ring fixing step, and the bottom is connected to the two pipeline medium channels;

[0010] A valve core is located in the straight-through valve body, the upper part of which is connected to the driving rod, and the bottom end of which is matched with the valve body gate of the valve body medium channel, and can move in the valve core hole under the control of the driving rod, so that the bottom end of the valve core contacts or separates from the sealing surface of the valve body medium channel, thereby controlling the closing and opening of the valve body medium channel;

[0011] The gland nut is located at the upper end of the valve core hole, has an external thread on the outer side, cooperates with the internal thread on the upper part of the valve core hole, is tightened and fixed on the upper end of the valve core hole, and the lower part of the gland nut presses the packing gland, and has an internal thread inside to be threadedly connected with the drive rod;

[0012] A driving rod, the lower part of which is connected to the valve core, and the outer side of which has an external thread which is threadedly connected to the compression sleeve nut, so as to be able to drive the valve core up and down to move in the valve core hole;

[0013] The packing gland, combined sealing assembly, and packing pad are sequentially located between the gland nut and the sealing ring fixing step of the valve core hole, and are compressed by the gland nut to provide a pressure-resistant seal between the straight-through valve body and the valve core, wherein the combined sealing assembly includes a plurality of stacked annular sealing rings, and a "V"-shaped contact sealing surface is provided between the plurality of annular sealing rings.

[0014] Optionally, the bottom end of the combined sealing assembly is supported on the sealing ring fixing step via the packing pad, and the upper end of the combined sealing assembly is provided with a packing sleeve cover. Tightening the sleeve nut squeezes the packing sleeve to expand the combined sealing assembly inwards and outwards and tightly fit the sealing surfaces of the straight-through valve body and the valve core.

[0015] Optionally, both contact surfaces of the combined sealing assembly and the packing gland and the packing gasket are flat.

[0016] Optionally, one or both of the two contact surfaces of the combined sealing assembly and the packing gland and the packing gasket are “V”-shaped contact sealing surfaces.

[0017] Optionally, the contact surface between the packing press sleeve and the combined sealing assembly is a plane, and the contact surface between the combined sealing assembly and the packing pad is a "V" shape.

[0018] Optionally, the material of the packing gland and the packing pad is stainless steel, and the material of the annular sealing ring of the combined sealing assembly is polytetrafluoroethylene.

[0019] Optionally, the combined sealing assembly includes 6-8 annular sealing rings, and the "V"-shaped angle is 80 degrees to 120 degrees.

[0020] Optionally, the combined sealing assembly includes four annular sealing rings, and the "V"-shaped angle is 100 degrees.

[0021] Optionally, a dustproof ring is provided at the top end of the compression sleeve nut, and a rotating handle is connected to the upper end of the driving rod.

[0022] Optionally, the driving rod and the valve core are made of 17-4PH H900 high-quality stainless steel, the driving rod is snap-connected to the valve core, the bottom end of the valve core is a spherical surface, and the straight-through valve body is made of 304 stainless steel.

[0023] The two substantially parallel valve body medium channels are substantially located on a straight line and substantially perpendicular to the valve body.

[0024] In summary, the utility model has the following advantages:

[0025] 1. The combined sealing assembly includes multiple annular sealing rings, which are designed in a "V" shape to improve the sealing effect.

[0026] 2. The sealing material is made of high-purity polytetrafluoroethylene, which has excellent corrosion resistance, high temperature resistance and low temperature resistance. It is widely used in special industries, such as toxic media, corrosive media, high temperature and low temperature media. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a straight-through manual stop valve according to a specific embodiment of the utility model;

[0028] Figure 2 It is a partial cross-sectional enlarged view of a straight-through manual stop valve according to a specific embodiment of the utility model;

[0029] Figure 3 It is a cross-sectional view of a packing gland according to a specific embodiment of the utility model;

[0030] Figure 4 is a cross-sectional view of a combined sealing assembly according to a specific embodiment of the utility model;

[0031] Figure 5 It is a cross-sectional view of a packing pad according to a specific embodiment of the utility model.

[0032] The technical features indicated by the reference numerals in the figure are:

[0033] 1. Straight-through valve body; 2. Valve core; 3. Driving rod; 4. Gland nut; 5. Dustproof retaining ring; 6. Packing gland; 7. Combined sealing assembly; 8. Packing pad; 9. Rotating handle. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] The utility model is characterized in that a combined sealing component is arranged between a valve core and a valve body, the combined sealing component comprises a plurality of sealing parts which cooperate with each other, and the plurality of sealing parts are matched with each other in a "V" shape to form a plurality of sealing surfaces. Furthermore, the sealing parts are made of polytetrafluoroethylene material and have the characteristics of corrosion resistance, high temperature resistance and low temperature resistance, so that they can be widely used in special industries.

[0036] See also Figure 1 , shows a cross-sectional view of a straight-through manual stop valve according to a specific embodiment of the utility model,

[0037] The straight-through manual stop valve comprises a straight-through valve body 1, a valve core 2, a driving rod 3, a gland nut 4, a packing gland 6, a combined sealing assembly 7, and a packing pad 8;

[0038] The straight-through valve body 1 has two substantially parallel valve body medium channels, and a valve core hole is provided inside the straight-through valve body 1 to accommodate the valve core 2. The upper part of the valve core hole has an internal thread, the middle part has a sealing ring fixing step, and the bottom is connected to the two pipeline medium channels;

[0039] The valve core 2 is located in the straight-through valve body 1, and its upper part is connected to the driving rod 3, such as a snap-on connection, and its bottom end has a spherical shape, for example, and matches the valve body gate of the valve body medium channel. It can move in the valve core hole under the control of the driving rod 3, so that the bottom end of the valve core 2 contacts or separates from the sealing surface of the valve body medium channel, thereby controlling the closing and opening of the valve body medium channel;

[0040] The gland nut 4 is located at the upper end of the valve core hole, has an external thread on the outside, cooperates with the internal thread on the upper part of the valve core hole, and is tightened and fixed on the upper end of the valve core hole. The lower part of the gland nut 4 presses the packing gland, and has an internal thread inside to be threadedly connected with the drive rod 3;

[0041] A driving rod 3, the lower part of which is connected to the valve core 2, for example, by a snap-fit ​​connection, and the outer side of which has an external thread threadedly connected to the compression sleeve nut 4, so as to be able to drive the valve core 2 to move up and down in the valve core hole;

[0042] The packing sleeve 6, the combined sealing assembly 7, and the packing gasket 8 are sequentially located between the sleeve nut 4 and the sealing ring fixing step of the valve core hole, and are compressed under the action of the sleeve nut 4 to make a pressure-resistant seal between the valve body 1 and the valve core 2, wherein the combined sealing assembly includes a plurality of stacked annular sealing rings, and a "V"-shaped contact sealing surface is provided between the plurality of annular sealing rings.

[0043] The "V"-shaped contact sealing surface can form multiple sealing surfaces from the original single contact surface, thereby enhancing the sealing ability and making the sealing effect more reliable. Moreover, the V"-shaped structure is more convenient for the installation and fixation of multiple sealing rings than other discontinuous structures.

[0044] Specifically, the bottom end of the combined sealing component 7 is supported on the sealing ring fixing step via the packing pad 8, and the upper end of the combined sealing component 7 is covered with a packing sleeve 6. Tightening the sleeve nut 4 squeezes the packing sleeve 6 to expand the combined sealing component 7 inside and outside, tightly fitting the sealing surfaces of the straight-through valve body 1 and the valve core 2, thereby forming an effective sealing effect.

[0045] In an optional embodiment, the two contact surfaces of the combined sealing assembly 7 and the packing gland 6 with the packing pad 8 are both flat surfaces. Figure 3 , illustratively, at this time, the two end faces of the packing sleeve are planes. Those skilled in the art can understand that the packing pad also has a similar plane, and the upper and lower end faces of the combined sealing assembly 7 are both planes, and only the multiple annular sealing rings of the combined sealing assembly 7 have a "V"-shaped contact sealing surface.

[0046] In a preferred embodiment, one or both of the two contact surfaces of the combined sealing assembly 7 and the packing gland 6 and the packing gasket 8 are "V"-shaped contact sealing surfaces. Figure 5 The contact surface between the packing pad 8 and the combined sealing assembly 7 is also "V" shaped, thereby further improving the sealing effect. Those skilled in the art will understand that the contact surface between the packing gland 6 and the combined sealing assembly 7 is also "V" shaped.

[0047] Preferably, Figure 1 , Figure 2 and Figure 4 In the example, the contact surface between the packing gland 6 and the combined sealing assembly 7 is a plane, and the contact surface between the combined sealing assembly 7 and the packing pad 8 is a "V" shape.

[0048] The packing gland 6 and the packing pad 8 are made of stainless steel.

[0049] The annular sealing ring of the combined sealing assembly 7 is made of polytetrafluoroethylene material, which has excellent corrosion resistance, high temperature resistance and low temperature resistance, and is widely used in special industries, such as toxic media, corrosive media, high temperature and low temperature media.

[0050] The combined sealing assembly 7 includes 6-8 annular sealing rings, preferably 4. The angle of the "V" shape is 80 degrees to 120 degrees, preferably 100 degrees.

[0051] Furthermore, a dustproof retaining ring 5 is provided at the top of the compression sleeve nut 4 to effectively prevent dust from entering the internal thread and affecting the up and down driving.

[0052] The upper end of the driving rod 3 is connected to a rotating handle 9, and the rotating handle 9 includes but is not limited to various types of drivable handles such as a ram's horn handle and a knurled handle.

[0053] In a preferred embodiment, the material of the drive rod 3 and the valve core 2 in the utility model is 17-4PH H900 high-quality stainless steel, which is characterized by high hardness, corrosion resistance and wear resistance. The drive rod 3 moves up and down by rotating the thread between the compression sleeve nut 4. The threads are coated with 7804 chemical-resistant medium grease, which effectively prevents the threads from being stuck due to high pressure, and also plays a lubricating role to reduce resistance. The drive rod 3 is connected to the valve core 2 in a snap-on manner. The drive rod 3 is manually rotated, and the valve core 2 is driven up and down by the rotation of the thread on the drive rod 3. The spherical surface at the bottom of the valve core 2 contacts the valve body sealing surface to achieve the purpose of hard sealing of the medium channel cutoff. The spherical sealing surface can effectively resist high pressure and prevent seepage. The valve body 1 is made of 304 stainless steel, which is different from the material of the valve core. It effectively prevents the valve core and the valve body sealing surface from being stuck due to the valve being closed for a long time.

[0054] In the present invention, the two substantially parallel valve body medium channels are substantially located on a straight line and substantially perpendicular to the valve body, but the present invention is not limited thereto, and the angle between the two valve body medium channels and the valve body may be less than 5 degrees.

[0055] In summary, the utility model has the following advantages:

[0056] 1. The combined sealing assembly includes multiple annular sealing rings, which are designed in a "V" shape to improve the sealing effect.

[0057] 2. The sealing material is made of high-purity polytetrafluoroethylene, which has excellent corrosion resistance, high temperature resistance and low temperature resistance. It is widely used in special industries, such as toxic media, corrosive media, high temperature and low temperature media.

[0058] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection of the utility model determined by the submitted claims.

Claims

1. A straight-through manual stop valve, characterized in that: include: Straight-through valve body, valve core, drive rod, gland nut, packing gland, combined sealing assembly, and packing gasket; The straight-through valve body has two substantially parallel valve body medium channels, and a valve core hole is provided inside the straight-through valve body to accommodate the valve core. The upper part of the valve core hole has an internal thread, the middle part has a sealing ring fixing step, and the bottom is connected to the two valve body medium channels; A valve core is located in the straight-through valve body, the upper part of which is connected to the driving rod, and the bottom end of which is matched with the valve body gate of the valve body medium channel, and can move in the valve core hole under the control of the driving rod, so that the bottom end of the valve core contacts or separates from the sealing surface of the valve body medium channel, thereby controlling the closing and opening of the valve body medium channel; The gland nut is located at the upper end of the valve core hole, has an external thread on the outer side, cooperates with the internal thread on the upper part of the valve core hole, is tightened and fixed on the upper end of the valve core hole, and the lower part of the gland nut presses the packing gland, and has an internal thread inside to be threadedly connected with the drive rod; A driving rod, the lower part of which is connected to the valve core, and the outer side of which has an external thread which is threadedly connected to the compression sleeve nut, so as to be able to drive the valve core up and down to move in the valve core hole; The packing gland, combined sealing assembly, and packing pad are sequentially located between the gland nut and the sealing ring fixing step of the valve core hole, and are compressed by the gland nut to provide a pressure-resistant seal between the straight-through valve body and the valve core, wherein the combined sealing assembly includes a plurality of stacked annular sealing rings, and a "V"-shaped contact sealing surface is provided between the plurality of annular sealing rings.

2. The manual stop valve according to claim 1, characterized in that: The bottom end of the combined sealing component is supported on the sealing ring fixing step through the packing pad, and the upper end of the combined sealing component is provided with a packing gland cover. Tightening the gland nut squeezes the packing gland so that the combined sealing component expands inside and outside and fits tightly with the sealing surfaces of the straight-through valve body and the valve core.

3. The manual stop valve according to claim 1, characterized in that: The two contact surfaces of the combined sealing component and the packing gland with the packing gasket are both planes.

4. The manual stop valve according to claim 1, characterized in that: One or both of the two contact surfaces of the combined sealing component and the packing gland and the packing pad are "V"-shaped contact sealing surfaces.

5. The manual stop valve according to claim 4, characterized in that: The contact surface between the packing gland and the combined sealing assembly is a plane, and the contact surface between the combined sealing assembly and the packing pad is a "V" shape.

6. The manual stop valve according to claim 1, characterized in that: The material of the packing gland and the packing pad is stainless steel, and the material of the annular sealing ring of the combined sealing assembly is polytetrafluoroethylene.

7. The manual stop valve according to claim 1, characterized in that: The combined sealing assembly includes 6-8 annular sealing rings, and the "V"-shaped angle is 80 degrees to 120 degrees.

8. The manual stop valve according to claim 7, characterized in that: The combined sealing assembly includes four annular sealing rings, and the "V"-shaped angle is 100 degrees.

9. The manual stop valve according to claim 1, characterized in that: A dustproof retaining ring is arranged at the top end of the compression sleeve nut, and a rotating handle is connected to the upper end of the driving rod.

10. The manual stop valve according to claim 1, characterized in that: The driving rod and the valve core are made of 17-4PH H900 high-quality stainless steel. The driving rod is connected to the valve core in a snap-fit ​​manner. The bottom end of the valve core is a spherical surface. The straight-through valve body is made of 304 stainless steel. The two substantially parallel valve body medium channels are substantially located on a straight line and substantially perpendicular to the valve body.

Images