A high-sealing gate valve

Abstract

This utility model relates to a high-sealing gate valve, mainly used in applications requiring extremely high media sealing, belonging to the fields of chemical and nuclear power equipment. It eliminates the traditional rigid connection between the valve stem and the drive mechanism, thereby eliminating the external leakage point where the valve stem protrudes from the valve cover, reducing the risk of valve leakage from the structural design stage. The valve stem is built into the valve body, and the valve stem nut is connected to the top of the valve stem by a trapezoidal thread. Strong magnets are designed internally and externally; the handwheel uses the magnetic force of the magnets to rotate the valve stem nut without external contact, ultimately achieving the opening and closing of the valve. Compared with traditional structures, this design only has one sealing structure at the valve cover and valve body location, greatly improving sealing reliability.

Description

Technical Field

[0001] This utility model relates to a high-sealing gate valve, which is mainly used in working conditions where the medium sealing requirement is extremely high, and belongs to the fields of chemical and nuclear power equipment. Background Technology

[0002] In the current field of fluid control, the working medium that needs to be controlled is no longer simply steam or water. Toxic, harmful, flammable, or explosive media are absolutely not allowed to leak. Therefore, the need to reduce the risk of valve leakage is becoming increasingly important.

[0003] Currently, gate valves on the market use a rigid connection between the valve stem and the transmission mechanism for transmission. Therefore, the valve stem must extend from the top of the valve cover and be sealed with a flexible graphite seal. This location frequently experiences external leakage, and there is even a risk that the valve stem may fly out of the valve in the event of a breakage, which is extremely dangerous for toxic, harmful, flammable, or explosive media. Therefore, minimizing external leakage points and improving valve sealing performance is urgently needed. Summary of the Invention

[0004] This invention provides a gate valve with high sealing performance, eliminating the traditional rigid connection between the valve stem and the drive mechanism, thus eliminating the external leakage point where the valve stem protrudes from the valve cover and reducing the risk of valve leakage from the structural design source. The valve stem is built into the valve body, and the valve stem nut is connected to the top of the valve stem by a trapezoidal thread. Strong magnets are designed inside and outside the valve body. The handwheel uses the magnetic force of the magnets to rotate the valve stem nut without the valve body, ultimately realizing the opening and closing of the valve. Compared with the traditional structure, this design only has one sealing structure at the valve cover and valve body, greatly improving the sealing reliability. A strong magnet is installed on the valve stem nut, and bearings are set above and below the valve stem nut. The positive pole of the strong magnet is placed on the outer end of the valve stem nut, creating a strong attraction with the negative pole of the strong magnet on the valve drive cover. Since the strong magnet is fixed to the valve parts, the handwheel can be rotated to drive the drive cover, and the attraction of the strong magnet drives the valve stem nut inside the valve, ultimately realizing the opening and closing of the valve.

[0005] The technical solution of this utility model consists of a valve body (1), a valve seat (2), a valve disc (3), a valve stem (4), a nut (5), a bolt (6), a valve cover (7), an external strong magnet (8), a transmission cover (9), a bearing (10), a handwheel (11), a round nut (12), a pressure ring (13), a screw (14), a bearing (15), a bearing (16), a valve stem nut (17), an internal strong magnet (18), a pressure cap (19), and a sealing gasket (20).

[0006] The beneficial effects of this utility model are: a high-sealing gate valve with the valve stem built into the valve body, eliminating the possibility of external leakage at the top of the valve stem. Utilizing magnetic force, a handwheel is used to rotate the valve stem nut remotely, ultimately achieving the opening and closing of the valve. Compared to traditional structures, this design only has one sealing structure at the valve cover and valve body locations, greatly improving sealing reliability. Attached Figure Description

[0007] Figure 1 : A schematic diagram of a high-sealing gate valve.

[0008] Figure 2 : Schematic diagram of the assembly of the transmission cover and the strong magnet.

[0009] Figure 3 Schematic diagram of valve stem nut and strong magnet assembly

[0010] Figure 4 Valve stem schematic diagram

[0011] Figure 5 Valve cover schematic diagram

[0012] Figure 1 The components are valve body (1), valve seat (2), valve disc (3), valve stem (4), nut (5), bolt (6), valve cover (7), external strong magnet (8), transmission cover (9), bearing (10), handwheel (11), round nut (12), pressure ring (13), screw (14), bearing (15), bearing (16), valve stem nut (17), internal strong magnet (18), pressure cap (19), and sealing gasket (20). Detailed Implementation

[0013] exist Figure 1 In the example shown, the valve body (1) and valve cover (7) are connected by bolts (6) and nuts (5), and the valve is sealed by pressing the sealing gasket (20) with the thread force. The valve body (1) and valve seat (2) are connected by fillet welds, and the valve disc (3) and valve stem (4) adopt a T-slot connection structure. The top of the valve stem (4) is provided with a trapezoidal thread, which is screwed into the valve stem nut (17). A bearing (16) is provided at the top and bottom of the valve stem nut to reduce the friction during the rotation of the valve stem nut. The valve stem nut is made of stainless steel. On the outer side of the middle, there are multiple rows of vertical grooves for placing a strong magnet (18). The positive pole of the strong magnet (18) faces outward, and the strong magnet (18) is fixed in the vertical groove with a stainless steel strip. The gland (19) and valve cover (7) are connected together by threads and spot welded to prevent loosening. The transmission cover (9) outside the valve cover (7) has multiple rows of vertical grooves on the inner side, which are also used to place a strong magnet (8), and are also fixed by welding with stainless steel strips. The upper end of the transmission cover (9) is connected to the handwheel (11) and fixed with a clamping ring (13).

[0014] When the valve needs to be operated, turn the handwheel (11). The handwheel (11) drives the transmission cover (9) to start rotating. Since the attraction of the strong magnet (8, 18) is much greater than the rotational force required to open the valve, the valve stem nut (17) starts to rotate under the drive of the strong magnet (18) and transmits the force to the valve stem (4) through the thread, realizing the action of the valve stem (4) driving the valve disc (3), and finally realizing the operation of the valve.

[0015] exist Figure 2 In the example shown, multiple vertical slots are opened in the inner hole of the transmission cover (9). A strong magnet (8) is placed in the slot and pressed down and welded in place with a stainless steel strip.

[0016] exist Figure 3 In the example shown, the valve stem nut (17) has multiple rows of vertical grooves on the outside for placing a strong magnet (18). The positive pole of the strong magnet (18) faces outward, and the strong magnet (18) is fixed in the vertical groove with a stainless steel strip.

[0017] exist Figure 4 In the embodiment shown, the upper end of the valve stem (4) is provided with a trapezoidal thread and the lower end is provided with a T-shaped structure, which is used in conjunction with the T-shaped groove on the top of the valve disc (3) to realize transmission.

[0018] exist Figure 5 In the embodiment shown, the valve cover (7) has a threaded part in the middle of the inner hole, which is used to cooperate with the pressure cap (19) to fix the bearing (15), bearing (16), and valve stem nut (17) in the position of the inner hole of the valve cover (7).

Claims

1. A high-sealing gate valve, comprising a valve body (1), a valve seat (2), a valve disc (3), a valve stem (4), a nut (5), a bolt (6), a valve cover (7), an external strong magnet (8), a transmission cover (9), a bearing 1 (10), a handwheel (11), a round nut (12), a clamping ring (13), a screw (14), a bearing 2 (15), a bearing 3 (16), a valve stem nut (17), an internal strong magnet (18), a pressure cap (19), and a sealing gasket (20); characterized in that... The valve disc (3) and valve stem (4) adopt a T-slot connection structure. The valve stem (4) is built into the valve body (1). The top of the valve stem (4) is provided with a trapezoidal thread, which is screwed into the valve stem nut (17). A bearing 3 (16) is provided on the top and bottom of the valve stem nut.

2. The high-sealing gate valve according to claim 1, characterized in that: The valve stem nut (17) has multiple rows of vertical grooves on the outside for placing a strong magnet (18). The positive pole of the strong magnet (18) faces outward, and the strong magnet (18) is fixed in the vertical groove with a stainless steel strip.

3. The high-sealing gate valve according to claim 1, characterized in that: The upper end of the valve stem (4) is provided with a trapezoidal thread, and the lower end is provided with a T-shaped structure, which works in conjunction with the T-shaped groove on the top of the valve disc (3) to achieve transmission.

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