A manual plunger valve

Abstract

The present invention discloses a manual plunger valve, which comprises a fixed head and a valve stem. External threads are provided on both the upper and lower sections of the valve stem. The valve stem is screwed into the carrier channel through the external thread on its lower section. A valve core is fixedly connected to the lower end of the valve stem. A seal is sleeved outside the valve core, which can contact and seal the gap between the valve core and the carrier channel when the valve core extends into the carrier channel along with the valve stem. The upper end of the valve stem passes upward through the fixed head and is threadedly connected with a limit nut. An operation counterbore facilitating the rotation of the valve stem by a tool is provided on the upper end face of the valve stem. External threads are provided on the lower section of the fixed head, and the fixed head is threadedly connected with the carrier channel through the external thread on its lower section. A positioning groove is provided on the outer wall of the upper section of the fixed head. A lock is provided on one side of the fixed head. A positioning protrusion capable of being engaged into the positioning groove of the fixed head is provided on the outer wall of the lock. The lock is fixedly locked on the carrier through a locking bolt. The present invention has the advantages of being applicable to high-pressure environments and having good sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of a channel opening and closing device for gas-liquid filling, storage and high-pressure resistance, and particularly relates to a manual plunger valve. Background Art

[0002] A plunger valve is a rotary valve in the shape of a plunger. It is one of the earliest valves used, and has the advantages of simple structure, rapid opening and closing, and small fluid resistance. It is suitable for cutting off and connecting media, diverting or throttling, and is widely applicable to industries such as petroleum, chemical industry, electric power, pharmacy, food, textile, printing and dyeing, boiler, and machinery. A plunger valve is a valve with a plug body as the opening and closing member. The plunger valve drives the plug body to reciprocate up and down by rotating the valve stem, so that the carrier flow port communicates with or disconnects from the channel port on the valve seat to achieve the opening and closing action. The plug body of the plunger valve is mostly a cone, which cooperates with the conical hole surface of the valve seat channel to form a sealing pair. The common plunger valves currently in use have the following disadvantages: (1) Relying on the direct contact between the precision-machined metal plug body and the valve seat for sealing, so the sealing performance is poor, the opening and closing force is large, and it is easy to wear, and it can usually only be used in low-pressure and small-diameter occasions; (2) The plunger valve is usually driven by a handwheel, with a large shape and volume, and a large opening and closing torque, which is not suitable for high-pressure environments; (3) The valve seat of the plunger valve is divided into two parts and the sealing performance of the separate seals is poor. Summary of the Invention

[0003] The purpose of the present invention is to provide a manual plunger valve that can be applied to high-pressure environments, can be installed and used in a narrow space, and has good sealing performance.

[0004] To achieve the above purpose, the present invention adopts the following technical scheme: A manual plunger valve includes a fixed head and a valve stem. External threads are provided on both the upper and lower sections of the valve stem. The valve stem is screwed into the carrier channel through the external thread on its lower section. A valve core is fixedly connected to the lower end of the valve stem. A seal is sleeved outside the valve core, which can contact and seal the gap between the valve core and the carrier channel when the valve core extends into the carrier channel with the valve stem. The upper end of the valve stem passes upward through the fixed head and is threadedly connected with a limit nut. An operation counterbore for facilitating the rotation of the valve stem by a tool is provided on the upper end face of the valve stem. External threads are provided on the lower section of the fixed head, and the fixed head is threadedly connected to the carrier channel through the external thread on its lower section. A positioning groove is provided on the outer wall of the upper section of the fixed head. A lock is provided on one side of the fixed head. A positioning protrusion that can be inserted into the positioning groove of the fixed head is provided on the outer wall of the lock. An installation hole that penetrates the lock up and down is provided in the lock, and a locking bolt for locking and fixing the lock on the carrier is provided in the installation hole.

[0005] Further, for a manual plunger valve described above, the specific connection structure between the valve core and the valve stem includes: a positioning hole is provided on the lower end face of the valve stem, the upper end diameter of the valve core becomes larger to form a positioning head that exactly inserts into the positioning hole of the valve stem. The positioning head of the valve core inserts into the positioning hole of the valve stem. A retaining ring groove is provided on the inner wall of the positioning hole, and the retaining ring groove is located below the positioning head of the valve core extending into the positioning hole of the valve stem. An elastic limiting retaining ring is placed in the retaining ring groove, and the elastic limiting retaining ring is used to limit and fix the positioning head of the valve core extending into the positioning hole of the valve stem in the positioning hole of the valve stem, so that the valve core and the valve stem are connected and fixed together.

[0006] Further, for a manual plunger valve described above, a gasket is provided between the end face of the positioning head of the valve core and the hole wall of the positioning hole.

[0007] Further, for a manual plunger valve described above, the seal is a first sealing ring, and the first sealing ring is placed in the first sealing ring positioning groove on the outer wall of the valve core.

[0008] Further, for a manual plunger valve described above, a ring of shoulders is provided on the outer wall of the fixed head between the external thread section of the fixed head and the fixed head positioning groove. A second sealing ring positioning groove is provided on the outer wall of the fixed head between the shoulder and the external thread section of the fixed head, and a second sealing ring is provided in the second sealing ring positioning groove to seal the gap between the shoulder of the fixed head and the end face of the carrier channel opening.

[0009] Further, for a manual plunger valve described above, the bottom end face of the valve core is a conical surface.

[0010] Further, for a manual plunger valve described above, a number of installation stress holes are provided on the upper end face of the limit nut.

[0011] Further, for a manual plunger valve described above, the operation counterbore is an internal hexagonal counterbore.

[0012] By implementing the above technical solutions, the beneficial effects of the present invention are: (1) There is no need to separately set a valve seat, and only a carrier installation channel connected to the carrier flow channel and used for installing this device needs to be reserved on the carrier, with a simple structure and convenient installation; (2) The traditional handwheel structure is changed, and the valve stem is driven to rotate by setting an internal hexagonal operation counterbore on the top end face of the valve stem, occupying less space; (3) The seal for sealing the gap between the valve core and the carrier channel is positioned and installed outside the valve core, so there is no need to set a sealing placement structure in the carrier channel, and the installation is more convenient; (4) It can be applied to high-pressure environments, can be installed and used in a narrow space, and has good sealing performance; (5) A lock for limiting and fixing the fixed head on the carrier is provided outside the fixed head, improving the use safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1Schematic structural diagram of a manual plunger valve according to the present invention.

[0014] Figure 2 is Figure 1 Schematic structural diagram in the top-down direction.

[0015] Figure 3 is Figure 2 Schematic structural diagram of the A-A cross-section shown in

[0016] Figure 4 is Figure 3 Exploded structural diagram of

[0017] Figure 5 Schematic diagram of the usage state when a manual plunger valve according to the present invention is installed on a carrier and closes the carrier channel.

[0018] Figure 6 Schematic diagram of the usage state when a manual plunger valve according to the present invention is installed on a carrier and opens the carrier channel. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown in the figure, a manual plunger valve includes a fixed head 1, in which a stepped inner hole 111 with a larger upper diameter and a smaller lower diameter is provided, and a valve stem 2. The upper section of the valve stem 2 has a smaller diameter and the lower section has a larger diameter. A first external thread 21 is provided on the outer part of the upper section of the valve stem 2, and a second external thread 22 is provided on the outer part of the lower section of the valve stem 2. The valve stem 2 is screwed into the carrier channel 31 through the second external thread 22 on its lower section. A valve core 4 is fixedly connected to the lower end of the valve stem 2. The valve core 4 is made of PEEK material. The valve core 4 made of PEEK material has the advantages of corrosion resistance, anti-aging, radiation resistance, excellent wear resistance, can still maintain excellent characteristics under high temperature and high pressure, high mechanical strength, and low creep. A seal 5 is sleeved outside the valve core 4, which can contact and seal the gap between the valve core 4 and the carrier channel 31 when the valve core 4 extends into the carrier channel 31 along with the valve stem 2. The seal 5 is made of polyurethane material. The seal 5 made of polyurethane material has the advantages of wear resistance, temperature resistance, good sealing performance, degradability, good resilience and high hardness. The upper end of the valve stem 2 passes upward through the small-diameter section of the inner hole 111 in the fixed head 1, and a limit nut 6 is threadedly connected through its first external thread 21. The outer diameter of the limit nut 6 is larger than the aperture of the small-diameter section of the stepped inner hole 111 in the fixed head and smaller than the aperture of the large-diameter section of the stepped inner hole 111 in the fixed head. An operation counterbore 7 for facilitating the rotation of the valve stem by a tool is provided on the upper end face of the valve stem 2. In this embodiment, the operation counterbore 7 is an internal hexagonal counterbore, so the operation is more convenient and it is convenient for an internal hexagonal wrench or a torque wrench to operate and rotate the valve stem 2. A third external thread 112 is provided on the outer part of the lower section of the fixed head 1. The fixed head 1 is threadedly connected to the carrier channel 31 through the third external thread 112 on its lower section. An annular positioning groove 8 is provided on the outer wall of the upper section of the fixed head 1. A lock 9 is provided on one side of the fixed head 1. A positioning protrusion 10 that can be inserted into the positioning groove 8 of the fixed head is provided on the outer peripheral surface of the lock 9. An installation hole 11 that penetrates the lock 9 up and down is provided in the lock 9. A locking bolt 12 for locking and fixing the lock 9 on the carrier 3 is provided in the installation hole 11. The locking bolt 12 is threadedly connected to the carrier 3 to lock and fix the lock 9 on the carrier 3. When the positioning protrusion 10 of the lock 9 is inserted into the positioning groove 8 of the fixed head 1 and the locking bolt 12 locks and fixes the lock 9 on the carrier 3, at this time, the lock 9 limits the fixed head 1, thereby preventing the fixed head 1 from moving upward and disengaging from the carrier channel 31 during use, and further preventing the valve stem 2 and the valve core 4 from disengaging from the carrier channel 31 during use, improving the use stability and safety of the equipment;

[0021] In this embodiment, the specific connection structure between the valve core 4 and the valve stem 2 includes: a positioning hole 13 is provided at the lower end face of the valve stem 2, and the diameter of the upper end of the valve core 4 becomes larger to form a positioning head 41 that just inserts into the positioning hole of the valve stem. The positioning head 41 of the valve core 4 is inserted into the positioning hole 13 of the valve stem 2. A retaining ring groove 14 is provided on the inner wall of the positioning hole 13. The retaining ring groove 14 is located below the positioning head 41 of the valve core that extends into the positioning hole 13 of the valve stem. An elastic limit retaining ring 15 is placed in the retaining ring groove 14. The elastic limit retaining ring 15 is used to limit and fix the positioning head 41 of the valve core that extends into the positioning hole 13 of the valve stem in the positioning hole 13 of the valve stem, so that the valve core 4 and the valve stem 2 are connected and fixed together. The above connection structure is simple and convenient for installation and maintenance; in this embodiment, a gasket 16 is provided between the end face of the positioning head 41 of the valve core and the hole wall of the positioning hole 13. The surface of the gasket is precise, and its function is to reduce friction;

[0022] In this embodiment, the seal 5 is a first sealing ring. The first sealing ring is placed in the first sealing ring positioning groove 17 on the outer wall of the valve core, which can prevent the seal 5 from falling off the valve core during use and improve the use stability;

[0023] In this embodiment, a shoulder 18 is provided on the outer wall of the fixed head 1 between the external thread section of the fixed head 1 and the fixed head positioning groove 8. A second sealing ring positioning groove is provided on the outer wall of the fixed head 1 between the shoulder 18 and the third external thread section 112. A second sealing ring 19 is provided in the second sealing ring positioning groove to seal the gap between the shoulder of the fixed head and the end face of the carrier channel opening. The sealing performance can be further improved through the second sealing ring; in this embodiment, the bottom end face of the valve core 4 is a conical surface, which can better seal the carrier flow channel and is more convenient to use; in this embodiment, a number of installation force holes 61 are provided on the upper end face of the limit nut 6. The installation force holes 61 are used to apply torque with a valve stem installation tool to facilitate the tool to rotate the valve stem 2 more conveniently;

[0024] During installation, first place the first sealing ring in the first sealing ring positioning groove 17 of the valve core 4, then place the second sealing ring 19 in the second sealing ring positioning groove, then insert the positioning head 41 of the valve core 4 into the positioning hole 13 of the valve stem 2, and then use the elastic limit retaining ring 15 to limit and fix the positioning head 41 of the valve core in the positioning hole 13 of the valve stem 2, so that the valve core 4 and the valve stem 2 are connected and fixed together. Then, screw the valve stem 2 into the carrier channel 31 reserved on the carrier 3 and communicating with the carrier flow channel 32 through the second external thread 22 at the lower section of the valve stem 2. At this time, the gap between the valve core 4 and the carrier channel 31 will be sealed by the first sealing ring. Then, put the fixing head 1 down over the outside of the small-diameter section of the valve stem 2, and then thread-connect the fixing head 1 to the carrier channel 31 through the third external thread 112 at its lower section. At this time, the shoulder 18 of the fixing head 1 will press the second sealing ring 19 down onto the end face of the carrier channel opening, further sealing the gap between the fixing head 1 and the carrier channel 31. Then, thread-connect the limit nut 6 to the small-diameter section of the valve stem 2. Then, when the positioning protrusion 10 of the lock 9 is snapped into the positioning groove 8 of the fixing head 1 and the locking bolt 12 locks the lock 9 to the carrier 3, the lock 9 will limit the fixing head 1 at this time, thus preventing the fixing head 1 from moving upward and disengaging from the carrier channel 31 during use, and further preventing the valve stem 2 and the valve core 4 from disengaging from the carrier channel 31 during use;

[0025] During use, just operate and rotate the valve stem 2 with an internal hexagon wrench or a torque wrench, driving the valve stem 2 and the valve core 4 to move downward along the carrier channel 31 to close the carrier flow channel 32, or driving the valve stem 2 and the valve core 4 to move upward along the carrier channel 31 to open the carrier flow channel 32.

[0026] The beneficial effects of the present invention are as follows: (1) There is no need to separately set a valve seat. It only needs to reserve a carrier installation channel on the carrier that communicates with the carrier flow channel and is used for installing this device, with a simple structure and convenient installation; (2) It changes the traditional handwheel structure. By setting an internal hexagon operation counterbore on the top surface of the valve stem to drive the rotation of the valve stem, it occupies less space; (3) The sealing member for sealing the gap between the valve core and the carrier channel is positioned and installed outside the valve core, so there is no need to set a sealing placement structure inside the carrier channel, making the installation more convenient; (4) It can be applied to high-pressure environments, can be installed and used in a narrow space, and has good sealing performance; (5) A lock for limiting and fixing the fixing head on the carrier is provided outside the fixing head, improving the use safety.

[0027] The above description is only a preferred embodiment of the present invention and does not impose any other form of limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A manual plunger valve, characterized in that: It includes a fixed head and a valve stem. External threads are provided on both the upper and lower sections of the valve stem. The valve stem is screwed into the carrier channel through the external thread on its lower section. A valve core is fixedly connected to the lower end of the valve stem. A seal is sleeved outside the valve core, which can contact and seal the gap between the valve core and the carrier channel when the valve core extends into the carrier channel with the valve stem. The upper end of the valve stem passes upward through the fixed head and is threadedly connected with a limit nut. An operation counterbore for facilitating the rotation of the valve stem by a tool is provided on the upper end face of the valve stem. External threads are provided on the lower section of the fixed head, and the fixed head is threadedly connected to the carrier channel through the external thread on its lower section. A positioning groove is provided on the outer wall of the upper section of the fixed head. A lock is provided on one side of the fixed head. A positioning protrusion that can be inserted into the positioning groove of the fixed head is provided on the outer wall of the lock. An installation hole penetrating the lock up and down is provided in the lock. A locking bolt for locking and fixing the lock on the carrier is provided in the installation hole; A shoulder is provided on the outer wall of the fixed head between the external thread section of the fixed head and the positioning groove of the fixed head. A second seal ring positioning groove is provided on the outer wall of the fixed head between the shoulder and the external thread section of the fixed head. A second seal ring for sealing the gap between the shoulder of the fixed head and the end face of the carrier channel opening is provided in the second seal ring positioning groove.

2. A manual plunger valve according to claim 1, characterized in that: The specific connection structure between the valve core and the valve stem includes: a positioning hole is provided on the lower end face of the valve stem. The diameter of the upper end of the valve core becomes larger to form a positioning head that just inserts into the positioning hole of the valve stem. The positioning head of the valve core is inserted into the positioning hole of the valve stem. A retaining ring groove is provided on the inner wall of the positioning hole, and the retaining ring groove is located below the positioning head of the valve core extending into the positioning hole of the valve stem. An elastic limit retaining ring is placed in the retaining ring groove, and the elastic limit retaining ring is used to limit and fix the positioning head of the valve core extending into the positioning hole of the valve stem in the positioning hole of the valve stem, so that the valve core and the valve stem are connected and fixed together.

3. A manual plunger valve according to claim 2, characterized in that: A gasket is provided between the end face of the positioning head of the valve core and the hole wall of the positioning hole.

4. A manual plunger valve according to claim 1, characterized in that: The seal is a first seal ring, and the first seal ring is placed in the first seal ring positioning groove on the outer wall of the valve core.

5. A manual plunger valve according to claim 1, characterized in that: The bottom end face of the valve core is a conical surface.

6. A manual plunger valve according to claim 1, characterized in that: A number of installation stress holes are provided on the upper end face of the limit nut.

7. A manual plunger valve according to claim 1, characterized in that: The operation counterbore is an internal hexagonal counterbore.

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