Stop valve for ammonia

Abstract

The stop valve comprises a main valve body and a valve cover fixedly installed on the main valve body, the main valve body is provided with a feeding port, a discharging port and a flow channel opening used for communicating the feeding port with the discharging port, a valve element is movably arranged in the main valve body, a first valve clack arranged at the bottom end of the valve element is movably arranged on the flow channel opening, and a second valve clack arranged at the bottom end of the valve element is movably arranged on the flow channel opening. The outer wall of the valve element is sleeved with a loop bar, and a second valve clack fixedly installed on the outer wall of the loop bar is movably arranged on one side of the flow channel opening and covers the flow channel opening. According to the stop valve for ammonia, the valve element is moved to enable the first valve clack to be attached to the flow channel opening to seal the flow channel opening in the first step, at the moment, communication between the feeding port and the discharging port is disconnected, meanwhile, the sleeve rod is moved to enable the second valve clack fixedly installed on the outer wall of the sleeve rod to be arranged on the flow channel opening in a covering mode, and therefore the flow channel opening is sealed. And the sealing effect of the flow channel opening is enhanced by sealing the flow channel opening for multiple times, and meanwhile, the service life of the stop valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a stop valve for ammonia. Background Art

[0002] Ammonia stop valve is used to control the flow of ammonia in the pipeline and realize the opening and closing of ammonia. The stop valve is a common valve type that controls the flow of fluid by rotating the valve core or valve plate, thereby achieving control and regulation of the fluid.

[0003] According to patent No. CN212055862U, the publication (announcement) date: 2020-12-01 discloses a stop valve for ammonia, including a valve body, a feed pipe, a discharge pipe, a connecting flange, a connecting head, a stuffing box, a valve stem, a valve core, a valve seat and a valve disc. The valve body is formed as a whole by the upper and lower intersections of the feed pipe and the discharge pipe. The feed pipe and the discharge pipe are connected at the connection, and the edge forms a valve seat. The middle of the valve seat is set as a shut-off port. The upper end of the valve body is integrally formed with a connecting head, and the outer side of the feed pipe and the discharge pipe is welded with a connecting flange. The upper end of the connecting head is connected to the stuffing box by bolts, and the upper end of the stuffing box is threadedly connected to the box cover. The inside of the stuffing box is threadedly connected to the valve stem, and the upper end of the valve stem is bolted to the handwheel. The valve core is welded at the lower end of the valve stem, and the lower end of the valve core is threadedly connected to the valve disc, and the lower end of the valve disc is inserted in the shut-off port.

[0004] In the prior art including the above patent, the lower end of the valve disc is inserted into the interception port to effectively realize the on-off of ammonia. However, the valve disc will be corroded to a certain extent in the interception port due to the corrosiveness of ammonia gas or ammonia water after long-term use, and the airtightness of the valve disc will gradually decrease. Utility Model Content

[0005] The utility model aims to provide a stop valve for ammonia, which can improve the sealing effect of the valve disc and thus increase the service life of the stop valve.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stop valve for ammonia, comprising a main valve body and a valve cover fixedly mounted thereon, the main valve body being provided with a feed port, a discharge port and a flow channel port for connecting the feed port and the discharge port, a valve core being movably arranged in the main valve body, and a first valve flap arranged at the bottom end of the valve core being movably arranged on the flow channel port, a sleeve rod being sleeved on the outer wall of the valve core, and a second valve flap fixedly mounted on the outer wall of the sleeve rod being movably arranged on one side of the flow channel port and covering the flow channel port.

[0007] Preferably, a screw is rotatably provided on the valve cover, and the bottom end of the screw is rotatably provided on the top end of the sleeve rod, the outer wall of the valve core is sleeved with a tension spring, and the two ends of the tension spring are respectively fixedly mounted on the valve core and the sleeve rod.

[0008] Preferably, a curved portion is provided on the inner wall of the flow channel opening, a plug is fixedly mounted on the bottom end of the valve core, the first valve flap is fixedly mounted on the bottom of the plug, and the first valve flap and the curved portion match each other.

[0009] Preferably, a ring platform is provided in the main valve body at one side of the flow channel opening, and the second valve flap is movably provided on the ring platform.

[0010] Preferably, an extension portion is provided on a side of the second valve disc, an annular groove portion is provided in the main valve body on one side of the annular platform, and the extension portion is movably disposed in the annular groove portion.

[0011] Preferably, an annular cavity is provided in the extension portion, and a recess is provided on the inner wall of one side of the annular groove portion.

[0012] In the above technical scheme, the utility model provides a stop valve for ammonia, which has the following beneficial effects: by moving the valve core, the first valve disc set on the valve core is attached to the flow opening, and then the first step of closing the flow opening is realized; at the same time, by moving the sleeve rod, the second valve disc cover fixedly installed on the outer wall of the sleeve rod is arranged on the flow opening, so as to cooperate with the sleeve rod to realize the second step of closing the flow opening; the flow opening is closed multiple times to enhance the sealing effect of the flow opening, and at the same time, the service life of the stop valve is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 A schematic diagram of the overall cross-sectional structure of the main valve body provided in an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the enlarged structure of point A provided in an embodiment of the utility model.

[0016] Description of reference numerals:

[0017] 1. Main valve body; 2. Valve cover; 3. Screw; 4. Second valve disc; 5. Valve core; 6. Sleeve rod; 11. Feed inlet; 12. Discharge outlet; 13. Flow channel; 14. Curved portion; 15. Ring groove portion; 16. Concave portion; 17. Ring platform; 41. Extension portion; 42. Ring cavity portion; 51. Tension spring; 52. Plug; 53. First valve disc. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-2 As shown, a stop valve for ammonia comprises a main valve body 1 and a valve cover 2 fixedly mounted thereon, the main valve body 1 is provided with a feed port 11, a discharge port 12 and a flow channel 13 for connecting the feed port 11 and the discharge port 12, a valve core 5 is movably arranged in the main valve body 1, and a first valve flap 53 arranged at the bottom end of the valve core 5 is movably arranged on the flow channel 13, a sleeve rod 6 is sleeved on the outer wall of the valve core 5, and a second valve flap 4 fixedly mounted on the outer wall of the sleeve rod 6 is movably arranged on one side of the flow channel 13 and covers the flow channel 13. The valve core 5 is moved so that the first valve flap 53 provided on the valve core 5 is attached to the flow opening 13, thereby realizing the first step of closing the flow opening 13. At this time, the connection between the feed port 11 and the discharge port 12 is disconnected. At the same time, the sleeve rod 6 is moved so that the second valve flap 4 fixedly installed on the outer wall of the sleeve rod 6 is covered on the flow opening 13, thereby cooperating with the sleeve rod 6 to realize the second step of closing the flow opening 13. The flow opening 13 is closed multiple times to enhance the sealing effect of the flow opening 13, and at the same time, the service life of the stop valve is extended.

[0020] As a technical solution further provided by the utility model, a screw rod 3 is threadedly rotatably arranged on the valve cover 2, and the bottom end of the screw rod 3 is rotatably arranged on the top end of the sleeve rod 6, the outer wall of the valve core 5 is sleeved with a tension spring 51, and the two ends of the tension spring 51 are respectively fixedly installed on the valve core 5 and the sleeve rod 6.

[0021] Specifically, Figure 1 and Figure 2 As shown, the screw rod 3 is threadably rotated to push the sleeve rod 6 downward, at which time the valve core 5 moves with the sleeve rod 6, and the first valve flap 53 on the valve core 5 gradually fits onto the flow channel opening 13, and then as the sleeve rod 6 continues to move downward, the valve core 5 slides inside the sleeve rod 6, and at the same time, the tension spring 51 accumulates force, and the second valve flap 4 covers the flow channel opening 13 to achieve the second step of closing the flow channel opening 13.

[0022] Furthermore, a curved portion 14 is provided on the inner wall of the flow channel opening 13 , a plug 52 is fixedly installed on the bottom end of the valve core 5 , a first valve flap 53 is fixedly installed on the bottom of the plug 52 , and the first valve flap 53 and the curved portion 14 match each other.

[0023] Specifically, the screw rod 3 is threadably rotated to push the sleeve rod 6 downward, and the sleeve rod 6 drives the first valve flap 53 on the valve core 5 to gradually approach the curved surface portion 14. The first valve flap 53 and the curved surface portion 14 match each other, and when the first valve flap 53 is attached to the curved surface portion 14, the convection channel opening 13 is sealed.

[0024] Furthermore, a ring platform 17 is provided in the main valve body 1 at one side of the flow channel opening 13 , and the second valve flap 4 is movably provided on the ring platform 17 .

[0025] Specifically, when the screw rod 3 is threadedly rotated to push the sleeve rod 6 downward, the sleeve rod 6 drives the first valve flap 53 on the valve core 5 to fit onto the curved surface portion 14, and the sleeve rod 6 continues to move downward to make the second valve flap 4 fit onto the ring platform 17, so that the second valve flap 4 cooperates with the ring platform 17 to achieve secondary sealing of the convection channel opening 13.

[0026] Furthermore, an extension portion 41 is disposed on a side of the second valve flap 4 , and an annular groove portion 15 is disposed on one side of the annular platform 17 in the main valve body 1 , and the extension portion 41 is movably disposed in the annular groove portion 15 .

[0027] Specifically, when the screw 3 is threadedly rotated to push the sleeve 6 downward, the sleeve 6 drives the first valve flap 53 on the valve core 5 to fit on the curved surface portion 14, and the sleeve 6 continues to move downward to make the second valve flap 4 fit on the ring platform 17. At the same time, the extension portion 41 is gradually inserted into the annular groove portion 15, and the side of the extension portion 41 fits on the inner wall of the annular groove portion 15, and then the extension portion 41 and the inner wall of the annular groove portion 15 fit together to achieve three-time sealing of the convection channel opening 13.

[0028] Furthermore, an annular cavity 42 is defined in the extension portion 41 , and a recessed portion 16 is defined on the inner wall of one side of the annular groove portion 15 .

[0029] Specifically, when the screw rod 3 is threadedly rotated to push the sleeve rod 6 downward, and the sleeve rod 6 drives the first valve disc 53 on the valve core 5 to fit on the curved surface portion 14, the sleeve rod 6 continues to move downward to make the second valve disc 4 fit on the annular platform 17, and at the same time, the extension portion 41 is gradually inserted into the annular groove portion 15, and the side of the extension portion 41 fits on the inner wall of the annular groove portion 15, and then the sleeve rod 6 continues to move downward to make the extension portion 41 squeeze the inner wall of the annular groove portion 15. At this time, the annular cavity portion 42 is compressed to make the outer wall on one side of the extension portion 41 bulge and fit on the recessed portion 16, and the outer wall on one side of the extension portion 41 bulges and fits on the recessed portion 16 to enhance the sealing between the extension portion 41 and the annular groove portion 15.

[0030] Working principle: The screw rod 3 is rotated by thread to push the sleeve rod 6 downward, and the sleeve rod 6 drives the first valve flap 53 on the valve core 5 to fit on the curved surface 14 to achieve the first step of closing the convection channel opening 13, and then the sleeve rod 6 continues to move downward to make the second valve flap 4 fit on the ring platform 17 to achieve the second step of closing the convection channel opening 13, and at the same time, the extension part 41 is gradually inserted into the annular groove part 15, and the side of the extension part 41 fits on the inner wall of the annular groove part 15 to achieve the third step of closing the convection channel opening 13. Then, as the sleeve rod 6 continues to move downward, the extension part 41 squeezes the inner wall of the annular groove part 15, and at this time, the annular cavity part 42 is compressed so that the outer wall on one side of the extension part 41 bulges and fits on the recessed part 16, and the outer wall on one side of the extension part 41 bulges and fits on the recessed part 16 to enhance the sealing between the extension part 41 and the annular groove part 15.

[0031] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A stop valve for ammonia, characterized in that: The invention comprises a main valve body (1) and a valve cover (2) fixedly mounted thereon, wherein the main valve body (1) is provided with a feed port (11), a discharge port (12) and a flow channel (13) for connecting the feed port (11) and the discharge port (12), wherein a valve core (5) is movably mounted in the main valve body (1), and a first valve flap (53) arranged at the bottom end of the valve core (5) is movably mounted on the flow channel (13), an outer wall of the valve core (5) is sleeved with a sleeve rod (6), and a second valve flap (4) fixedly mounted on the outer wall of the sleeve rod (6) is movably mounted on one side of the flow channel (13) and covers the flow channel (13).

2. The ammonia stop valve according to claim 1, characterized in that: A screw rod (3) is rotatably arranged on the valve cover (2), and the bottom end of the screw rod (3) is rotatably arranged on the top end of the sleeve rod (6). A tension spring (51) is sleeved on the outer wall of the valve core (5), and the two ends of the tension spring (51) are respectively fixedly mounted on the valve core (5) and the sleeve rod (6).

3. The ammonia stop valve according to claim 1, characterized in that: A curved surface portion (14) is provided on the inner wall of the flow channel opening (13); a plug block (52) is fixedly mounted on the bottom end of the valve core (5); the first valve flap (53) is fixedly mounted on the bottom of the plug block (52); and the first valve flap (53) and the curved surface portion (14) match each other.

4. The ammonia stop valve according to claim 1, characterized in that: A ring platform (17) is provided in the main valve body (1) at one side of the flow channel opening (13), and the second valve flap (4) is movably arranged on the ring platform (17).

5. The ammonia stop valve according to claim 4, characterized in that: An extension portion (41) is provided on the side of the second valve flap (4), an annular groove portion (15) is provided on one side of the annular platform (17) in the main valve body (1), and the extension portion (41) is movably arranged in the annular groove portion (15).

6. The ammonia stop valve according to claim 5, characterized in that: An annular cavity (42) is provided in the extension portion (41), and a recessed portion (16) is provided on the inner wall of one side of the annular groove portion (15).

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