A three-way gate valve

Abstract

A three-way gate valve belongs to the field of valve technology, and is used to solve the problem that when switching between the main pipeline and the backup pipeline, multiple valves usually need to be operated and installed to complete the switching of the pipeline. Technical points: The present invention includes a valve body, a valve seat and a valve disc, the upper part of the valve body is connected to a packing chamber seat, and the lower part connected to the pipeline is Y-shaped in shape, three valve seats are arranged inside the valve body, and a valve disc is installed in the middle of the three valve seats, the valve body is connected to the bracket, the upper part of the valve disc is connected to the valve stem, the middle part of the valve stem is connected to a guide plate, and the upper part is connected to the valve stem nut, the valve stem nut is installed in the transition head, the lower part of the transition head is connected to the bracket by bolts, and the upper part is connected to the electric actuator by bolts, and a rotation adjustment device is installed on one side of the bracket. The present invention is suitable for three-way gate valves.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a three-way gate valve. Background Art

[0002] Spare pipelines are often required in pipeline systems. When switching between the main pipeline and the spare pipeline, it is usually necessary to operate multiple valves installed to complete the purpose of switching the pipeline. Valves usually have the following three forms: 1. Use multiple shut-off valves to control the flow direction of the medium by operating the valves separately at the pipeline branches. The disadvantage is that a large number of valves need to be installed and the operation is cumbersome; 2. Use a three-way valve in the form of an ordinary stop valve to complete the main and standby pipeline switching function. The disadvantage is that although the pipeline switching can be achieved, only one way can be connected and the other can be disconnected, and it cannot be shut down at the same time; 3. Switch the main and standby pipelines through a Y-type three-way ball valve. The disadvantage is that the soft-sealed ball valve has a small range of applicable media and is not resistant to high temperature and high pressure. The hard-sealed ball valve can withstand high temperature and high pressure but requires the medium to be free of impurities and particles. The applicable range is also small, and due to the large rotational friction, the sealing performance is poor. Summary of the invention

[0003] The purpose of the present invention is to provide a three-way gate valve that can be completely shut off according to the requirement of switching between the main and standby pipelines of a pipeline system.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a three-way gate valve comprises a valve body, a valve seat and a valve disc, the upper part of the valve body is connected to a packing chamber seat, the lower part of the valve body is connected to the pipeline part and has a Y-shaped shape, three valve seats are arranged inside the valve body, a valve disc is installed in the middle position of the three valve seats, the valve body is connected to the bracket, the upper part of the valve disc is connected to the valve stem, the middle part of the valve stem is connected to a guide plate, the upper part is connected to a valve stem nut, the valve stem nut is installed in a transition head, the lower part of the transition head is connected to the bracket by bolts, and the upper part is connected to an electric actuator by bolts, and a rotation adjustment device is installed on one side of the bracket.

[0005] Preferably, three inlet and outlet pipes are evenly arranged at intervals of 120 degrees at the lower part of the valve body, one of which is an inlet and two are outlets, one of the two outlets is connected to the main pipeline and the other is connected to the spare pipeline, and a valve seat is welded in each of the inlet and outlet pipes.

[0006] Preferably, the valve flap is a triangular cone with three sloped sides, the upper part has a thread connected to the valve stem and fixed by a pin, the middle part has a U-shaped channel, the cross-section of the channel is circular, and the three sides of the valve flap respectively cooperate with the three valve seats.

[0007] Preferably, the valve stem passes through the packing chamber seat, the middle portion of the valve stem is fixedly connected to the guide plate pin, and the upper portion has a thread that cooperates with the valve stem nut thread.

[0008] Preferably, the rotation adjustment device comprises a motor and an adjustment gear, the adjustment gear is connected to the output shaft of the motor through a coupling, teeth are arranged circumferentially on the guide plate, the adjustment gear is meshed with the guide plate, and the thickness P of the adjustment gear is greater than the thickness H of the guide plate.

[0009] Preferably, the output shaft of the electric actuator is connected to the valve stem nut to drive the valve stem nut to rotate.

[0010] Preferably, the channel cross-section of the valve seat is circular, and the sealing surface where the valve seat and the valve disc cooperate is spray-welded with cobalt-based hard alloy.

[0011] Preferably, the upper and lower ends of the valve stem nut are fixed in the transition head through thrust bearings respectively.

[0012] Preferably, the annular space around the valve stem in the packing chamber seat is filled with packing and is compressed by a packing pressing ring.

[0013] Preferably, the filler is made of XS450.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention drives the valve stem nut to rotate through the action of an electric actuator, and the internal thread of the valve stem cooperates with the thread on the valve stem to make the valve stem produce linear motion. The valve stem drives the valve disc to rise and fall, and the three-way gate control pipeline reaches three working modes: the main pipeline flows and the spare pipeline is shut off; the spare pipeline flows and the main pipeline is shut off; the main pipeline and the spare pipeline are shut off at the same time.

[0016] The present invention realizes pipeline switching through a valve, is simple to operate, convenient and reliable, and solves the disadvantage that a three-way valve in the form of an ordinary stop valve cannot achieve complete shutoff. The internal pipeline of the valve is full-diameter, which reduces pipeline pressure loss when connecting the joint, has strong applicability and reliable sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the valve flap of the present invention in a fully raised state;

[0019] Figure 3 This is a schematic diagram of the state where valve outlet 1 and outlet 2 are all closed;

[0020] Figure 4 This is a schematic diagram of the valve outlet 1 being connected and outlet 2 being closed;

[0021] Figure 5 This is a schematic diagram of the state where the valve outlet 2 is connected and the outlet 1 is closed;

[0022] Figure 6 It is a structural schematic diagram of the valve flap of the present invention;

[0023] Figure 7 yes Figure 6 A top view of

[0024] In the figure: 1. valve body; 2. valve seat; 3. valve disc; 4. valve stem; 5. packing chamber seat; 6. packing pressure ring; 7. packing; 8. rotary adjustment device; 8-1. motor; 8-2. adjustment gear; 9. electric actuator; 10. transition head; 11. valve stem nut; 12. bracket; 13. guide plate. DETAILED DESCRIPTION

[0025] Specific implementation method 1: Combination Figures 1 to 7 The present embodiment is described. The three-way gate valve described in the present embodiment includes a valve body 1, a valve seat 2 and a valve disc 3. The upper part of the valve body 1 is connected to a stuffing chamber seat 5, and the lower part of the connecting pipeline part is Y-shaped in shape. Three valve seats 2 are arranged inside the valve body, and valve discs 3 are installed in the middle positions of the three valve seats. The valve body 1 is connected to a bracket 12, and the upper part of the valve disc 3 is connected to a valve stem 4. The middle part of the valve stem 4 is connected to a guide plate 13, and the upper part is connected to a valve stem nut 11. The valve stem nut 11 is installed in a transition head 10. The lower part of the transition head 10 is connected to the bracket 12 by bolts, and the upper part is connected to the electric actuator 9 by bolts. A rotation adjustment device 8 is installed on one side of the bracket 12.

[0026] Specific implementation method 2: Combination Figures 1 to 7 To explain this embodiment, the valve body 1 of this embodiment has three inlet and outlet pipes evenly arranged at intervals of 120 degrees at the lower part, one of which is an inlet and two are outlets, one of the two outlets is connected to the main pipeline and the other is connected to the spare pipeline, and a valve seat 2 is welded in each of the inlet and outlet pipes. Other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method three: Combination Figures 1 to 7 This embodiment is described. The valve flap 3 in this embodiment is a triangular cone with three sides having slopes, a threaded upper portion connected to the valve stem 4 and fixed by a pin, a U-shaped channel in the middle, and a circular cross section of the channel. The three sides of the valve flap 3 are respectively matched with the three valve seats 2. Other components and connection relationships are the same as those of the first or second embodiment.

[0028] Specific implementation method four: Combination Figures 1 to 7 To explain this embodiment, the valve stem 4 in this embodiment passes through the packing chamber seat 5, the middle part of the valve stem 4 is fixedly connected with the guide plate 13 by a pin, and the upper part has a thread that is threadedly matched with the valve stem nut 11. Other components and connection relationships are the same as those of the first, second or third embodiments.

[0029] Specific implementation method five: Combination Figures 1 to 7 This embodiment is described. The rotation adjustment device 8 in this embodiment comprises a motor 8-1 and an adjustment gear 8-2. The adjustment gear 8-2 is connected to the output shaft of the motor 8-1 through a coupling. The guide plate 13 is circumferentially arranged with teeth. The adjustment gear 8-2 is meshed with the guide plate 13. The thickness P of the adjustment gear 8-2 is greater than the thickness H of the guide plate 13. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3 or 4.

[0030] Specific implementation method six: Combination Figures 1 to 7 To explain this embodiment, the output shaft of the electric actuator 9 in this embodiment is connected to the valve stem nut 11 to drive the valve stem nut 11 to rotate. Other components and connection relationships are the same as those of the first, second, third, fourth or fifth embodiments.

[0031] Specific implementation method seven: Combination Figures 1 to 7 To explain this embodiment, the channel cross section of the valve seat 2 in this embodiment is circular, and the sealing surface of the valve seat 2 and the valve flap 3 is spray-welded with cobalt-based hard alloy. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0032] Specific implementation method eight: Combination Figures 1 to 7 To explain this embodiment, the upper and lower ends of the valve stem nut 11 in this embodiment are fixed in the transition head 10 through thrust bearings. Other components and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth or seventh embodiments.

[0033] Specific implementation method nine: Combination Figures 1 to 7 To explain this embodiment, the annular space around the valve stem in the packing chamber seat 5 of this embodiment is filled with packing 7 and is compressed by a packing pressing ring 6. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5, 6, 7 or 8.

[0034] Specific implementation method ten: Combination Figures 1 to 7 To illustrate this embodiment, the material of the filler 7 in this embodiment is XS450. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5, 6, 7, 8 or 9.

[0035] Working principle of the present invention: The present invention drives the valve stem nut to rotate through the action of the electric actuator, and the valve stem generates linear motion through the cooperation of its internal thread and the thread on the valve stem, and the valve stem drives the valve disc to rise and fall, and after the valve disc is raised, the guide plate on the valve stem is driven to rotate to different angles through the rotary adjustment device. The valve stem drives the valve disc to rotate and adjust the direction of the channel in the valve disc to have three different working positions. After the adjustment is completed, the electric actuator drives the valve stem to descend, and the valve disc and the valve seat cooperate to connect each branch pipeline, and the three-way gate control pipeline reaches three working modes: 1. When the valve disc channel is connected to the fluid inlet and the main pipeline, the main pipeline flows and the spare pipeline is shut off; 2. When the valve disc channel is connected to the fluid inlet and the spare pipeline, the spare pipeline flows and the main pipeline is shut off; 3. When the valve disc channel is connected to the main pipeline and the spare pipeline at the same time, the main pipeline and the spare pipeline are shut off at the same time.

Claims

1. A three-way gate valve, comprising a valve body (1), a valve seat (2) and a valve disc (3), characterized in that: The valve body (1) The upper part is connected to the packing chamber seat (5), and the lower part is connected to the pipeline. The shape is Y-shaped. The valve body is provided with Three valve seats (2), valve flaps (3) are installed in the middle of the three valve seats, and the valve body (1) is connected to a bracket (12). The upper part of the valve disc (3) is connected to the valve stem (4), and the valve stem drives the valve disc to move up and down. The middle part of the valve stem (4) is connected to a guide plate (13), and the upper part is connected to a valve stem nut (11). The valve stem nut (11) is installed in a transition head (10). The lower part of the transition head (10) is connected to a bracket (12) by bolts, and the upper part is connected to an electric actuator (9) by bolts. A rotation adjustment device (8) is installed on one side of the bracket (12); The valve flap (3) is in the shape of a triangular cone, and its three sides are inclined. The upper part is provided with a thread connected to the valve stem (4) and fixed by a pin. The middle part has a U-shaped channel, and the cross section of the channel is circular. The three sides of the valve flap (3) are respectively matched with the three valve seats (2); The rotation adjustment device (8) comprises a motor (8-1) and an adjustment gear (8-2), the adjustment gear (8-2) being connected to the output shaft of the motor (8-1) via a coupling, the guide plate (13) being circumferentially arranged with teeth, the adjustment gear (8-2) being meshed with the guide plate (13), and the thickness P of the adjustment gear (8-2) being greater than the thickness H of the guide plate (13); The output shaft of the electric actuator (9) is connected to the valve stem nut (11) to drive the valve stem nut (11) to rotate.

2. A three-way gate valve according to claim 1, characterized in that: The lower part of the valve body (1) is spaced 120 There are three inlet and outlet pipes evenly arranged, one of which is the inlet and two are outlets. One of the two outlets is connected to the main A pipeline is connected to the inlet and outlet pipes, and the other is connected to a spare pipeline. A valve seat (2) is welded inside each of the inlet and outlet pipes.

3. A three-way gate valve according to claim 1, characterized in that: The valve stem (4) passes through the packing chamber seat (5), the middle part of the valve stem (4) is fixedly connected to the guide plate (13) by a pin, and the upper part has a thread that matches the thread of the valve stem nut (11).

4. A three-way gate valve according to claim 1, characterized in that: The channel cross section of the valve seat (2) is circular, and the sealing surface where the valve seat (2) and the valve flap (3) cooperate is spray-welded with cobalt-based hard alloy.

5. A three-way gate valve according to claim 1, characterized in that: The valve stem nut (11) has two upper and lower The ends are fixed in the transition head (10) through thrust bearings.

6. A three-way gate valve according to claim 1, characterized in that: The annular space around the valve stem in the packing chamber seat (5) is filled with packing (7) and is compressed by a packing pressing ring (6).

7. A three-way gate valve according to claim 6, characterized in that: The material of the filler (7) is XS450.

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