Gate valve without liquid accumulation

Abstract

The gate valve is composed of a valve body, a valve clack, a nut, a valve rod, a valve deck, a bolt, a gasket, a graphite ring and a driving device, an inlet valve seat is arranged on the inlet side of the valve body, and the included angle between the inlet valve seat and the vertical center line of the valve body ranges from 3 degrees to 6 degrees; an outlet valve seat is arranged on the outlet side of the valve body and is parallel to the vertical center line of the valve body. And a channel hole is formed between the lower half part of the inlet valve seat and the valve body inlet runner, so that the inlet runner is communicated with the valve body middle cavity. The inlet flow channel extends to the outlet valve seat, and the lower edge of the inlet flow channel is parallel to the horizontal center line of the valve body; the included angle between the inner hole of the inlet valve seat and the horizontal center line of the valve body is 10-20 degrees; the part A of the outlet flow channel is obliquely arranged, the inclination angle of the part A is 10-20 degrees, and the part A of the outlet flow channel is higher than the part B of the outlet flow channel. When the valve is closed, media in the middle cavity of the valve body can be discharged along the channel hole, media in inner holes of the outlet and the inlet valve seat can be discharged along the outlet and the inlet flow channel, molten salt crystallization at the sealing face is avoided, valve failure is avoided, and the sealing performance and reliability of the valve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a non-liquid accumulation gate valve which can be used in the field of easy crystallization medium such as molten salt. BACKGROUND

[0002] In the field of photo-thermal power generation and molten salt energy storage, the medium in the pipeline is usually binary or ternary molten salt which will crystallize and solidify when the temperature is below 220 DEG C. The bottom of the middle cavity of the ordinary gate valve is lower than the sealing surface of the valve seat. When the valve is closed, the lower part of the valve cavity will retain molten salt medium. The part of the valve disc and the sealing surface of the valve seat which is lower than the flow passage will be immersed in the molten salt. As the temperature decreases, the molten salt will solidify, which will cause the valve disc and the valve seat to be bonded together, or the molten salt particles will be retained on the sealing surface, resulting in the failure of the valve and the inability to normally open.

[0003] The present application provides a non-liquid accumulation gate valve. The angle d between the sealing surface of the inlet valve seat and the vertical center line of the valve body is 3-6 degrees. The sealing surface of the outlet valve seat is parallel to the vertical center line of the valve body. The lower half of the inlet valve seat is provided with a passage hole between the inlet flow passage of the valve body, and the passage hole is lower than the sealing surface of the outlet valve seat. The outlet flow passage is inclined downward from the sealing surface of the outlet valve seat. When the valve is closed, the middle cavity of the valve body is communicated with the inlet flow passage through the passage hole. The molten salt medium in the middle cavity of the valve body can be discharged along the passage hole between the inlet valve seat and the valve body. The medium at the inner hole of the outlet valve seat can be discharged along the outlet flow passage, so as to avoid the crystallization of the molten salt at the sealing surface. In addition, when the unit is stopped, the molten salt medium in the middle cavity of the valve body can be discharged through the passage hole. The medium at the inner hole of the inlet valve seat can be discharged through the inlet flow passage. The medium at the inner hole of the outlet valve seat can be discharged along the outlet flow passage, so as to avoid the crystallization of the molten salt at the sealing surface and the failure of the valve, thereby greatly improving the sealing performance and reliability of the valve. SUMMARY

[0004] The present application provides a non-liquid accumulation gate valve which is composed of a valve body, a valve disc, a nut, a valve stem, a valve cover, bolts, a gasket, a graphite ring and a driving device. The valve body and the valve cover are connected by bolts and nuts, and are sealed by a gasket and a graphite ring. The valve body is provided with an inlet valve seat at the medium inlet side. The angle d between the sealing surface of the inlet valve seat and the vertical center line of the valve body is 3-6 degrees. The valve body is provided with an outlet valve seat at the medium outlet side. The sealing surface of the outlet valve seat is parallel to the vertical center line of the valve body. The lower half of the inlet valve seat is provided with a passage hole between the inlet flow passage of the valve body, so as to communicate the inlet of the valve body with the middle cavity of the valve body. The inlet flow passage of the valve body extends to the outlet valve seat. The lower edge of the flow passage is parallel to the horizontal center line of the valve body. The angle a between the inner hole of the inlet valve seat and the horizontal center line of the valve body is 10-20 degrees. The outlet flow passage B is horizontally arranged. The center line thereof is parallel to the horizontal center line of the valve body. The outlet flow passage A (i.e. the inner hole of the outlet valve seat) is inclinedly arranged. The inclination angle b thereof is 10-20 degrees. The A part of the outlet flow passage (i.e. the inner hole of the outlet valve seat) is higher than the B part of the outlet flow passage.

[0005] The outlet sealing surface of the valve disc (2) is parallel to the center line, the angle between the inlet sealing surface of the valve disc (2) and the center line is the same as the angle between the inlet valve seat sealing surface and the vertical center line of the valve body (1), and both are d. The upper end of the valve disc (2) is provided with a hook groove connected with the valve rod.

[0006] The driving device drives the valve rod and moves the valve disc up and down to realize the opening and closing of the valve. When the valve is closed, the sealing surface of the valve disc is tightly attached to the sealing surface of the inlet valve seat and the outlet valve seat, and the wedge angle of the inlet valve seat can provide sealing force for the sealing of the outlet valve seat.

[0007] In the closed state of the valve, the middle cavity of the valve body is communicated with the inlet flow passage through the passage hole, and the molten salt medium in the middle cavity of the valve body can be discharged along the passage hole, and the medium at the inner hole of the outlet valve seat of the valve can be discharged along the outlet flow passage. In addition, when the unit is stopped, the molten salt medium in the middle cavity of the valve body is discharged through the passage hole, and the molten salt medium at the inner hole of the inlet valve seat can be discharged through the inlet flow passage, and the molten salt medium at the inner hole of the outlet valve seat can be discharged through the outlet flow passage.

[0008] The beneficial effects of the present application are that when the unit is stopped, the molten salt medium in the middle cavity of the valve body and the sealing surface of the valve disc can be discharged, the crystallization of the molten salt at the sealing surface is avoided, the failure of the valve is avoided, and the sealing performance and reliability of the valve are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structure diagram of the non-accumulation sluice valve;

[0010] Figure 2 It is a sectional view of the valve body;

[0011] Figure 3 It is a C-C sectional view of the valve body;

[0012] Figure 4 It is a sectional view of the valve disc.

[0013] In the figure, 1. valve body, 2. valve disc, 3. nut, 4. valve rod, 5. valve cover, 6. bolt, 7. gasket, 8. graphite ring, 9. driving device DETAILED DESCRIPTION

[0014] In Figure 1 , Figure 2The valve body 1 is connected with the valve cover 5 by the bolt 6 and the nut 3, and is sealed by the gasket 7 and the graphite ring 8. The valve body 1 is provided with an inlet valve seat at the medium inlet side, and the included angle d between the sealing surface of the inlet valve seat and the vertical center line of the valve body 1 is 3-6 degrees. The valve body 1 is provided with an outlet valve seat at the medium outlet side, and the sealing surface of the outlet valve seat is parallel to the vertical center line of the valve body 1. A passage hole is arranged between the lower half of the inlet valve seat and the inlet flow channel of the valve body 1, so that the inlet of the valve body 1 is communicated with the middle cavity of the valve body. The inlet flow channel of the valve body 1 extends to the outlet valve seat, and the lower edge of the flow channel is parallel to the horizontal center line of the valve body 1. The included angle a between the inner hole of the inlet valve seat and the horizontal center line of the valve body 1 is 10-20 degrees. The outlet flow channel B is horizontally arranged, and the center line thereof is parallel to the horizontal center line of the valve body. The outlet flow channel A (i.e. the inner hole of the outlet valve seat) is arranged obliquely, and the oblique angle b is 10-20 degrees. The A part of the outlet flow channel (i.e. the inner hole of the outlet valve seat) is higher than the B part of the outlet flow channel.

[0015] In Figure 3 In the embodiment, the outlet sealing surface of the valve disc 2 is parallel to the center line, and the included angle between the inlet sealing surface of the valve disc 2 and the center line is the same as the included angle between the sealing surface of the inlet valve seat and the vertical center line of the valve body 1, which is d. The upper end of the valve disc 2 is provided with a hook groove, which is connected with the valve rod 4.

[0016] The driving device 9 drives the valve rod 4 and moves the valve disc 2 up and down, so as to open and close the valve. When the valve is closed, the sealing surface of the valve disc 2 is tightly combined with the sealing surfaces of the inlet valve seat and the outlet valve seat, and the wedge angle of the inlet valve seat can provide sealing force for the sealing of the outlet valve seat.

[0017] In the closed state of the valve, the middle cavity of the valve body 1 is communicated with the inlet flow channel through the passage hole, and the molten salt medium in the middle cavity of the valve body 1 can be discharged along the passage hole. The medium at the inner hole of the outlet valve seat of the valve can be discharged along the outlet flow channel. In addition, when the unit is stopped, the molten salt medium in the middle cavity of the valve body can be discharged through the passage hole, the molten salt medium at the inner hole of the inlet valve seat can be discharged through the inlet flow channel, and the molten salt medium at the inner hole of the outlet valve seat can be discharged through the outlet flow channel. This structure can effectively avoid the crystallization of the molten salt at the sealing surface, avoid causing the failure of the valve, and improve the sealing performance and the action reliability of the valve.

Claims

1. A gate valve without liquid accumulation, comprising a valve body (1), a valve disc (2), a nut (3), a valve stem (4), a valve cover (5), a bolt (6), a washer (7), a graphite ring (8), and a drive device (9), characterized in that: The valve body (1) and valve cover (5) are connected by bolts (6) and nuts (3), and sealed by washers (7) and graphite rings (8); the valve body (1) is provided with an inlet valve seat on the medium inlet side and an outlet valve seat on the medium outlet side. The angle d between the sealing surface of the inlet valve seat and the vertical center line of the valve body (1) is 3 degrees to 6 degrees. The sealing surface of the outlet valve seat is parallel to the vertical center line of the valve body (1). A channel hole is provided between the lower half of the inlet valve seat and the inlet flow channel of the valve body (1). The inlet flow channel extends to the outlet valve seat, and its lower edge is parallel to the horizontal center line. The angle a between the inner hole of the inlet valve seat and the horizontal center line of the valve body (1) is 10 degrees to 20 degrees. The lower edge of the outlet flow channel (B) is parallel to the horizontal center line. The inclination angle b of the outlet flow channel (A) is 10 degrees to 20 degrees. The outlet flow channel (A) is higher than the outlet flow channel (B).

2. The gate valve without liquid accumulation according to claim 1, characterized in that: The outlet sealing surface of the valve disc (2) is parallel to the center line. The angle between the inlet sealing surface of the valve disc (2) and the center line is the same as the angle between the inlet valve seat sealing surface and the vertical center line of the valve body (1), both being d. A hook groove is provided at the upper end of the valve disc (2).

Images