Pressure balancing straight-through type manual stop valve

Abstract

A pressure balancing straight-through type manual stop valve comprises a straight-through type valve body, a valve element, a driving rod, a pressing sleeve nut, a pressure balancing cylinder, a pressure bin moving sleeve and a filler sleeve. A balance pressure type pressure relief component is arranged between the valve element and the valve body, a drainage hole is formed in the bottom of the valve element, a groove is formed in the upper portion of the pressure moving sleeve, and therefore a pressure empty bin is formed between the balance pressure cylinders. When the stop valve works, the pressure in the valve body enters the pressure empty bin at the upper part of the pressure moving sleeve through the drainage hole, so that the pressure in the valve core is balanced; furthermore, when the valve element is screwed down, the pressure moving sleeve moves downwards under the action of gravity, the size of the pressure empty bin is increased, the pressure in the stop valve is further balanced, and therefore the safety of the stop valve is improved.

Description

[0001] This application claims priority to Chinese patent application No. 202421072129.9, filed on May 16, 2024, and entitled “Balanced Pressure Right-Angle Manual Shut-Off Valve”, the entire contents of which are incorporated by reference in the application herein. Technical Field

[0002] The utility model relates to the field of mechanical valves, and in particular to a balanced pressure 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 and low-temperature media. Background Art

[0003] 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℃.

[0004] 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.

[0005] When the pressure is too high, how to balance the pressure in the stop valve, and further, how to provide a pressure relief channel when the pressure exceeds the critical value to avoid damage to the stop valve and thus cause production safety accidents, have become technical problems that urgently need to be solved in the prior art. Utility Model Content

[0006] The utility model aims to provide a balanced pressure straight-through manual stop valve, which can balance the pressure in the stop valve as much as possible during operation and further provide a pressure relief channel under critical pressure.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A balanced pressure straight-through manual stop valve, comprising:

[0009] Straight-through valve body, valve core, drive rod, gland nut, balance pressure cylinder, gland moving sleeve and packing sleeve;

[0010] The straight-through valve body has two substantially parallel valve medium channels, and a valve core hole is provided inside the straight-through valve body to accommodate the valve core, the balance pressure cylinder, the pressure chamber moving sleeve and the stuffing sleeve;

[0011] The upper part of the valve core hole has an internal thread, the lower part has a packing sleeve fixing step, and the bottom is connected to the two-way pipeline medium channel;

[0012] The 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. It 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 outer diameter of the middle part of the valve core is increased, thereby forming a fixing step of the pressure bin moving sleeve to fix the pressure bin moving sleeve. The bottom end of the valve core has a drainage hole, and the drainage hole extends upward from the bottom to form an air flow channel leading to the pressure empty bin, so as to guide the pressure to the pressure empty bin;

[0013] A compression sleeve 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, has an internal thread on the inner side, and is threadedly connected with the drive rod;

[0014] 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;

[0015] The balance pressure cylinder and the packing sleeve are located between the packing sleeve fixing step of the valve core hole and the packing sleeve fixing step of the valve core hole in sequence, and are compressed by the packing sleeve nut;

[0016] The said balanced pressure cylinder has a through hole at the upper part to pass the said valve core, a moving channel at the lower part to accommodate the said pressure chamber moving sleeve, and the bottom presses against the said packing sleeve;

[0017] The pressure chamber movable sleeve is located in the moving channel of the balance pressure cylinder, and has a groove on the upper part, so as to form a pressure chamber between the pressure chamber and the balance pressure cylinder, and the bottom end of the groove has a through hole to penetrate the valve core, and the bottom of the pressure chamber movable sleeve is pressed against the fixed step of the pressure chamber movable sleeve;

[0018] The stuffing sleeve has a through hole in the middle to pass the valve core, the upper part of which abuts against the balance pressure cylinder, and the lower part of which abuts against the fixed step of the pressure bin moving sleeve.

[0019] Optionally, the upper part of the balancing pressure cylinder has a groove at a position facing the valve core, and a first combined sealing ring is arranged in the groove; the lower part of the balancing pressure cylinder has a groove at a position facing the pressure chamber movable sleeve, and a second combined sealing ring is arranged in the groove; the pressure chamber movable sleeve has a groove at a position facing the valve core, and a third combined sealing ring is arranged in the groove; the packing sleeve has a groove at a position facing the valve core, and a fourth combined sealing ring is arranged in the groove; the packing sleeve has a groove at a position facing the straight-through valve body, and a fifth combined sealing ring is arranged in the groove.

[0020] Optionally, the bottom end of the balancing pressure cylinder has a plurality of transverse pressure relief channels extending from the middle to the outside, the diameter of the lower part of the balancing pressure cylinder is smaller than the diameter of the upper part, and a longitudinal pressure relief channel connected to the transverse pressure relief channel is formed around the lower part of the balancing pressure cylinder, and a plurality of pressure relief holes are provided at positions corresponding to the straight-through valve body and the longitudinal pressure relief channels.

[0021] Optionally, the pressure relief hole is provided with a pressure relief hole dust cover made of elastic material.

[0022] Optionally, there are four transverse pressure relief channels 18, which are spaced 90 degrees apart from each other.

[0023] Optionally, the drainage hole is divided into a first section, a second section and a third section from bottom to top; wherein the first section and the second section are consistent with the extension direction of the valve core, and the diameter of the first section is larger than the diameter of the second section, and the extension direction of the third section is perpendicular to the extension direction of the valve core, and a transverse through hole is formed in the valve core, which is connected to the pressure chamber.

[0024] Optionally, the first to fifth combined sealing rings include a linear soft sealing “O” ring and an annular retaining ring, and the annular retaining ring is located outside the linear soft sealing “O” ring.

[0025] Optionally, the linear soft seal "0" type ring is made of hydrogenated nitrile butadiene material; the annular retaining ring is made of polytetrafluoroethylene material.

[0026] 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.

[0027] 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.

[0028] The two substantially parallel valve body medium channels are substantially located on a straight line and substantially perpendicular to the valve body.

[0029] In summary, the utility model has the following advantages:

[0030] 1. The straight-through valve body adopts a balanced pressure structure. Regardless of whether the valve is closed or open, the medium is drained into the pressure empty chamber of the balanced pressure cylinder and the pressure chamber moving sleeve through the drainage hole at the bottom of the valve core. As the driving rod drives the valve core downward, the pressure chamber moving sleeve in the balanced pressure cylinder moves downward with the valve core, increasing the space in the balanced pressure cylinder, allowing the medium from the drainage to flow into the balanced pressure cylinder, greatly reducing friction resistance, thereby reducing the manual operating torque for closing the valve, without resistance, easy operation, and fast switching.

[0031] 2. It has a multi-group combined sealing surface structure. All sealing surfaces adopt a combined sealing structure of linear soft sealing "O" ring and annular retaining ring. All sealing substrates are directly processed into grooves. The groove size is determined by the wire diameter and inner diameter of the sealing "O" ring. The seal between the valve core and the valve body is composed of the inner annular groove of the bottom packing sleeve and the outer annular groove plus a combined sealing ring, which enhances the sealing ability and makes the sealing effect more reliable.

[0032] 3. A pressure relief channel is set on the balance pressure cylinder, and a pressure relief hole is set on the valve body, which provides an overload pressure relief channel. The dust cover of the pressure relief hole effectively prevents dust from entering the valve body, further improving the pressure redundancy of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional view of a balanced pressure straight-through manual stop valve according to a specific embodiment of the utility model;

[0034] Figure 2 is a cross-sectional view of a balanced pressure cylinder according to a specific embodiment of the utility model;

[0035] Figure 3 It is a bottom view of a balanced pressure cylinder according to a specific embodiment of the utility model;

[0036] Figure 4 It is a cross-sectional view of a pressing bin moving sleeve according to a specific embodiment of the utility model;

[0037] Figure 5 is a cross-sectional view of a packing sleeve according to a specific embodiment of the utility model;

[0038] Figure 6 It is a cross-sectional view of a valve core according to a specific embodiment of the utility model.

[0039] The technical features indicated by the reference numerals in the figure are:

[0040] 1. Straight-through valve body; 2. Valve core; 3. Drive rod; 4. Pressing sleeve nut; 5. Dustproof retaining ring; 6. Balance pressure cylinder; 7. First combination sealing ring; 8. Second combination sealing ring; 9. Pressure chamber moving sleeve; 10. Third combination sealing ring; 11. Stuffing sleeve; 12. Fourth combination sealing ring; 13. Fifth combination sealing ring; 14. Rotating handle; 15. Pressure relief hole; 16. Dust cover for pressure relief hole; 17. Pressure empty chamber; 18. Horizontal pressure relief channel; 19. Longitudinal pressure relief channel; 20. Drainage hole. DETAILED DESCRIPTION

[0041] 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.

[0042] The utility model is characterized in that: a balanced pressure relief component is arranged between the valve core and the valve body, a drainage hole is arranged at the bottom of the valve core, and a groove is arranged on the upper part of the pressure moving sleeve, so that a pressure empty chamber is formed between the balanced pressure cylinders; when the stop valve is working, the pressure in the valve body enters the pressure empty chamber on the upper part of the pressure moving sleeve through the drainage hole, so as to balance the pressure in the valve core; further, when the valve core is tightened, the pressure moving sleeve moves downward under the action of gravity, so as to increase the volume of the pressure empty chamber, further balance the pressure in the stop valve, and improve the safety of the stop valve.

[0043] See also Figure 1-6 , shows a balanced pressure straight-through manual stop valve according to a specific embodiment of the utility model, and a cross-sectional view of related parts,

[0044] The straight-through manual stop valve comprises a straight-through valve body 1, a valve core 2, a driving rod 3, a compression sleeve nut 4, a balance pressure cylinder 6, a compression chamber moving sleeve 9 and a stuffing sleeve 11;

[0045] The straight-through valve body 1, the two substantially parallel valve body medium channels, are substantially located in a straight line and substantially perpendicular to the valve body, and a valve core hole is provided inside the straight-through valve body 1 to accommodate the valve core 2, the balance pressure cylinder 6, the pressure chamber moving sleeve 9 and the stuffing sleeve 11;

[0046] The upper part of the valve core hole has an internal thread, the lower part has a packing sleeve fixing step, and the bottom is connected to the two-way pipeline medium channel; the lower part refers to the upper part of the working space at the bottom end of the valve core 2, so that the packing sleeve 11 can be fixed without hindering the contact or separation of the sealing surface of the bottom end of the valve core 2 and the valve body medium channel, that is, it does not hinder the closing and opening of the valve body medium channel;

[0047] 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. Its bottom end has a spherical shape, for example, which matches 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 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. The outer diameter of the middle part of the valve core 2 is increased, thereby forming a fixing step of the pressure bin moving sleeve to fix the pressure bin moving sleeve 9. The bottom end of the valve core 2 has a drainage hole 20, which extends upward from the bottom to form an air flow channel leading to the pressure empty bin 17, so as to pass the pressure to the pressure empty bin 17;

[0048] The compression sleeve nut 4 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, has an internal thread inside, and is threadedly connected with the driving rod 3;

[0049] 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;

[0050] The balance pressure cylinder 6 and the stuffing sleeve 11 are located between the gland nut 4 and the stuffing sleeve fixing step of the valve core hole in sequence, and are pressed tightly under the action of the gland nut 4;

[0051] The said balanced pressure cylinder 6 has a through hole at the upper part to penetrate the said valve core 2, and a moving channel is provided in the lower part to accommodate the said pressure chamber moving sleeve 9, and the bottom presses against the said packing sleeve 11;

[0052] See also Figure 4 The pressure chamber movable sleeve 9 is located in the moving channel of the balance pressure cylinder 6 and has a groove on the upper part, thereby forming a pressure chamber 17 between the balance pressure cylinder 6 and the bottom end of the groove has a through hole to penetrate the valve core 2, and the bottom of the pressure chamber movable sleeve 9 is pressed against the fixed step of the pressure chamber movable sleeve.

[0053] See also Figure 5 The stuffing sleeve 11 has a through hole in the middle to penetrate the valve core 2, the upper part of which abuts against the balance pressure cylinder 6, and the lower part abuts against the fixed step of the pressure bin moving sleeve.

[0054] In a straight-through stop valve, one channel is a feed channel, and the other channel is usually a discharge channel, which is opened or closed by the valve core 2. Therefore, the pressure in the feed channel of the stop valve of the utility model can flow upward through the drainage hole 20 at the bottom of the valve core 2, and enter the pressure empty chamber 17 to balance the empty chamber pressure. When the drive rod 3 is rotated, the valve core 2 moves downward to close the stop valve. At this time, the fixed step of the pressure chamber moving sleeve of the valve core 2 moves downward, and the pressure chamber moving sleeve 9 moves downward with the valve core 2 under the action of gravity, so as to be relatively away from the balance pressure cylinder 6, increase the space in the balance pressure cylinder, and thus increase the volume of the pressure empty chamber 17, so that the medium diverted flows into the balance pressure cylinder, which greatly reduces the friction resistance and provides a better pressure balancing effect, thereby reducing the manual operating torque of closing the valve, without resistance, easy to operate, and faster switching.

[0055] For further information, see Figure 6 The drainage hole 20 is divided into a first section, a second section and a third section from bottom to top; the first section and the second section are consistent with the extension direction of the valve core, and the diameter of the first section is larger than the diameter of the second section. The extension direction of the third section is perpendicular to the extension direction of the valve core, and a transverse through hole is formed in the valve core 2, which is connected to the pressure chamber 17.

[0056] Therefore, since the diameter of the first section is relatively large, it is convenient for the airflow to quickly enter the drainage hole 20. As the drainage path extends, the diameter of the second section is reduced, which is convenient for blocking the gas and gradually balancing the pressure.

[0057] For further information, see Figure 2 , Figure 3 At the bottom end of the balancing pressure cylinder 6, there are multiple transverse pressure relief channels 18 extending outward from the middle. The diameter of the lower part of the balancing pressure cylinder 6 is smaller than the diameter of the upper part, that is, smaller than the inner diameter of the straight-through valve body 1, so that a longitudinal pressure relief channel 19 connected to the transverse pressure relief channel 18 is formed around the lower part of the balancing pressure cylinder 6, and multiple pressure relief holes 15 are provided at positions of the straight-through valve body 1 corresponding to the longitudinal pressure relief channels 19.

[0058] In this way, when the packing sleeve 11 and the balance pressure cylinder 6 are overloaded, the pressure can be discharged to the outside of the valve body through the transverse pressure relief channel 18 and the longitudinal pressure relief channel 19 to the pressure relief hole 15, thereby discharging the overload pressure and protecting against damage caused by the overload pressure, thereby minimizing the damage or explosion of the stop valve due to pressure overload and improving the safety factor of the stop valve.

[0059] Furthermore, the pressure relief hole 15 is provided with a pressure relief hole dust cover 16, which is made of elastic material, exemplarily, a product made of nitrile rubber. The dust cover 16 with excellent elasticity and anti-oxidation function prevents dust from entering the straight-through valve body 1 through the pressure relief hole 15 to damage the balanced pressure structure.

[0060] exist Figure 2 In the example, there are four transverse pressure relief channels 18, which are spaced 90 degrees apart from each other.

[0061] The upper part of the balancing pressure cylinder 6 has a groove at a position facing the valve core 2, and a first combined sealing ring 7 is arranged in the groove; the lower part of the balancing pressure cylinder 6 has a groove at a position facing the pressure chamber movable sleeve 9, and a second combined sealing ring 8 is arranged in the groove; the pressure chamber movable sleeve 9 has a groove at a position facing the valve core 2, and a third combined sealing ring 10 is arranged in the groove; the stuffing sleeve 11 has a groove at a position facing the valve core 2, and a fourth combined sealing ring 12 is arranged in the groove; the stuffing sleeve 11 has a groove at a position facing the straight-through valve body 1, and a fifth combined sealing ring 13 is arranged in the groove.

[0062] The first to fifth combined sealing rings include a linear soft sealing "O" ring and an annular retaining ring. The annular retaining ring is located on the outside of the linear soft sealing "O" ring. The linear soft sealing "O" ring is made of hydrogenated nitrile material, which is soft and resistant to specific low and high temperatures, thereby making the valve effectively anti-fatigue; the annular retaining ring is made of polytetrafluoroethylene material, which effectively protects the "O" ring from sealing failure due to high pressure overflow, and also increases the valve's long-term anti-fatigue use.

[0063] 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.

[0064] The upper end of the driving rod 3 is connected to a rotating handle 14, and the rotating handle 14 includes but is not limited to various types of drivable handles such as a horn handle and a knurled handle.

[0065] 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 thread rotation 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 straight-through 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.

[0066] 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.

[0067] In summary, the utility model has the following advantages:

[0068] 1. The straight-through valve body adopts a balanced pressure structure. Regardless of whether the valve is closed or open, the medium is drained into the pressure empty chamber of the balanced pressure cylinder and the pressure chamber moving sleeve through the drainage hole at the bottom of the valve core. As the driving rod drives the valve core downward, the pressure chamber moving sleeve in the balanced pressure cylinder moves downward with the valve core, increasing the space in the balanced pressure cylinder, allowing the medium from the drainage to flow into the balanced pressure cylinder, greatly reducing friction resistance, thereby reducing the manual operating torque for closing the valve, without resistance, easy operation, and fast switching.

[0069] 2. It has a multi-group combined sealing surface structure. All sealing surfaces adopt a combined sealing structure of linear soft sealing "O" ring and annular retaining ring. All sealing substrates are directly processed into grooves. The groove size is determined by the wire diameter and inner diameter of the sealing "O" ring. The seal between the valve core and the valve body is composed of the inner annular groove of the bottom packing sleeve and the outer annular groove plus a combined sealing ring, which enhances the sealing ability and makes the sealing effect more reliable.

[0070] 3. A pressure relief channel is set on the balance pressure cylinder, and a pressure relief hole is set on the valve body, which provides an overload pressure relief channel. The dust cover of the pressure relief hole effectively prevents dust from entering the valve body, further improving the pressure redundancy of the stop valve.

[0071] 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 balanced pressure straight-through manual stop valve, characterized in that: include: Straight-through valve body, valve core, drive rod, gland nut, balance pressure cylinder, gland moving sleeve and packing sleeve; The straight-through valve body has two substantially parallel valve medium channels, and a valve core hole is provided inside the straight-through valve body to accommodate the valve core, the balance pressure cylinder, the pressure chamber moving sleeve and the stuffing sleeve; The upper part of the valve core hole has an internal thread, the lower part has a packing sleeve fixing step, and the bottom is connected to the two medium channels; The 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. It 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 outer diameter of the middle part of the valve core is increased, thereby forming a fixing step of the pressure bin moving sleeve to fix the pressure bin moving sleeve. The bottom end of the valve core has a drainage hole, and the drainage hole extends upward from the bottom to form an air flow channel leading to the pressure empty bin, so as to guide the pressure to the pressure empty bin; A compression sleeve 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, has an internal thread on the inner side, and is 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 balance pressure cylinder and the packing sleeve are located between the packing sleeve fixing step of the valve core hole and the packing sleeve fixing step of the valve core hole in sequence, and are compressed by the packing sleeve nut; The said balanced pressure cylinder has a through hole at the upper part to pass the said valve core, a moving channel at the lower part to accommodate the said pressure chamber moving sleeve, and the bottom presses against the said packing sleeve; The pressure chamber movable sleeve is located in the moving channel of the balance pressure cylinder, and has a groove on the upper part, so as to form a pressure chamber between the pressure chamber and the balance pressure cylinder, and the bottom end of the groove has a through hole to penetrate the valve core, and the bottom of the pressure chamber movable sleeve is pressed against the fixed step of the pressure chamber movable sleeve; The stuffing sleeve has a through hole in the middle to pass the valve core, the upper part of which abuts against the balance pressure cylinder, and the lower part of which abuts against the fixed step of the pressure bin moving sleeve.

2. The manual stop valve according to claim 1, characterized in that: The upper part of the balancing pressure cylinder has a groove at a position facing the valve core, and a first combined sealing ring is arranged in the groove; the lower part of the balancing pressure cylinder has a groove at a position facing the pressure chamber movable sleeve, and a second combined sealing ring is arranged in the groove; the pressure chamber movable sleeve has a groove at a position facing the valve core, and a third combined sealing ring is arranged in the groove; the packing sleeve has a groove at a position facing the valve core, and a fourth combined sealing ring is arranged in the groove; the packing sleeve has a groove at a position facing the straight-through valve body, and a fifth combined sealing ring is arranged in the groove.

3. The manual stop valve according to claim 1 or 2, characterized in that: The bottom end of the balancing pressure cylinder is provided with a plurality of transverse pressure relief channels extending outward from the middle, the diameter of the lower part of the balancing pressure cylinder is smaller than the diameter of the upper part, a longitudinal pressure relief channel connected with the transverse pressure relief channel is formed around the lower part of the balancing pressure cylinder, and a plurality of pressure relief holes are provided at positions corresponding to the straight-through valve body and the longitudinal pressure relief channels.

4. The manual stop valve according to claim 3, characterized in that: The pressure relief hole is provided with a pressure relief hole dust cover which is made of elastic material.

5. The manual stop valve according to claim 4, characterized in that: There are four transverse pressure relief channels, which are spaced 90 degrees apart from each other.

6. The manual stop valve according to claim 3, characterized in that: The drainage hole is divided into a first section, a second section and a third section from bottom to top; The first section and the second section are consistent with the extension direction of the valve core, and the diameter of the first section is larger than the diameter of the second section. The extension direction of the third section is perpendicular to the extension direction of the valve core. A transverse through hole is formed in the valve core and connected to the pressure chamber.

7. The manual stop valve according to claim 3, characterized in that: The first to fifth combined sealing rings include a linear soft sealing "O" ring and an annular retaining ring, and the annular retaining ring is located outside the linear soft sealing "O" ring.

8. The manual stop valve according to claim 7, characterized in that: The linear soft seal "0" type ring is made of hydrogenated nitrile butadiene material; the annular retaining ring is made of polytetrafluoroethylene material.

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.

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