Regulating two-piece knife gate valve

Abstract

The utility model relates to the field of valve technology, and specifically provides a regulating two-piece knife gate valve, including a valve body, the valve body including a left valve body and a right valve body that are relatively arranged, and a valve seat is arranged between the left valve body and the right valve body, and also includes a bracket and a valve stem connected to the bracket and longitudinally displaceable relative to the bracket, one end of the valve stem is connected to an operating mechanism, and the other end is connected to a gate plate, and the operating mechanism controls the displacement of the valve stem relative to the bracket to conduct or cut off the fluid; the valve stem is linked to a pointer that is arranged horizontally, and at least one end of the pointer passes through the bracket, and a travel groove for sliding one end of the pointer is arranged on the side of the bracket corresponding to the pointer passing through, and a scale mark is arranged on the side of the travel groove. The device sets a pointer on the valve stem of the gate valve in a linked manner, and one end of the pointer extends horizontally into the travel groove on the bracket, so that the pointer moves in the travel groove as the valve stem moves up and down to play an indicating role, so that the operator can judge whether the gate plate is in place according to the indication of the pointer.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an adjustable two-piece knife gate valve. Background Art

[0002] Knife-type gate valve is mainly used as a regulating and intercepting device, and is applied to pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electricity, shipbuilding, metallurgy, and energy systems. It is based on ordinary gate valves, but the flat valve plate is replaced by a knife-shaped valve plate; the knife-type gate valve solves the problems of large flow resistance, heavy weight, difficult installation, and large footprint of ordinary gate valves, flat gate valves, ball valves, stop valves, regulating valves, butterfly valves, etc. with its advantages of small size, small flow resistance, light weight, easy installation, and easy disassembly.

[0003] The knife-type gate valves currently on the market usually have a groove on the valve seat, and the gate is embedded in the groove and cooperates with the seal to achieve the function of sealing and shutting off.

[0004] The applicant has previously designed a two-piece bidirectional sealing knife gate valve (utility model patent application number: CN201320605189.8), which includes a valve body, a valve seat, a gate, a bracket, a valve stem and a handwheel arranged on the bracket, one end of the valve stem is connected to the gate, and the other end is linked to the handwheel. The valve body includes a left valve body and a right valve body, the left valve body and the right valve body are riveted, and the valve seat is provided with a groove corresponding to the connection between the left valve body and the right valve body. The size of the groove is adapted to the gate, and the groove is filled with an elastic seal. The elastic seal is flush with the valve seat at the opening position corresponding to the groove. A stuffing box and a stuffing gland for blocking the stuffing box opening are provided on one side of the valve body corresponding to the bracket. The stuffing box and the stuffing gland are both provided with a through hole for the gate to pass through. A stuffing is provided in the stuffing box, and an elastic member is provided between the stuffing and the stuffing box. The two-piece bidirectional sealing knife gate valve of this scheme is provided with a left and a right valve body, which is convenient for production and processing, and can effectively avoid the accumulation of impurities on the valve seat, and has good sealing performance.

[0005] During the use of this two-piece knife gate valve, the applicant further improved the design of its structure based on customer feedback and production practice to improve the operability of the two-piece knife gate valve during use and facilitate accurate observation from the outside to see whether the knife gate is in place. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a regulating two-piece knife gate valve. The technical solution adopted by the utility model is as follows:

[0007] A regulating two-piece knife gate valve comprises a valve body, wherein the valve body comprises a left valve body and a right valve body arranged opposite to each other, and a valve seat is arranged between the left valve body and the right valve body, and the valve seat cooperates with a gate plate to conduct or cut off a fluid, and further comprises a bracket and a valve stem connected to the bracket and longitudinally displaceable relative to the bracket, one end of the valve stem is connected to an operating mechanism (such as a hand wheel or an electric or pneumatic actuator), and the other end is connected to the gate plate, and the operating mechanism controls the displacement of the valve stem relative to the bracket to conduct or cut off the fluid; the valve stem is linked to a laterally arranged pointer, and at least one end of the pointer passes through the bracket, and a travel groove for sliding one end of the pointer is arranged on a side of the bracket corresponding to the passing of the pointer, and a scale mark is arranged on the side of the travel groove.

[0008] Preferably, one end of the pointer is fixedly connected to the valve stem, and the other end passes through the bracket travel groove, so that only one end of the pointer passes through the bracket travel, and the side with the travel groove and scale marking is the observation surface of the bracket.

[0009] Preferably, the valve stem is connected to the gate plate via a connector, one end of the pointer is connected to the connector, and when the gate plate cooperates with the valve seat to cut off the fluid, the pointer is located at the lower end of the travel groove.

[0010] Preferably, gate protection covers are extended on both sides of the bracket, and when the gate cooperates with the valve seat to conduct the fluid and one end of the pointer slides to the upper end of the travel groove, the gate moves into the gate protection cover.

[0011] Preferably, a stuffing box is arranged in the valve body, and the stuffing box includes a first stuffing box close to the gate plate and a second stuffing box close to the valve stem. An annular sealing ring is arranged in the first stuffing box, and a U-shaped sealing ring and a positioning frame are arranged in the second stuffing box, and the positioning frame is embedded in the opening of the U-shaped sealing ring.

[0012] Preferably, the valve seat comprises an elastic seal embedded in the valve body, and the elastic seal comprises a resistance portion located just below the gate plate and sealingly cooperating with the gate plate, and a compensation portion having a convex arc surface located on the side of the resistance portion.

[0013] Preferably, the upper surface of the elastic seal is flush with the bottom surface of the valve body to prevent the material from settling into the embedded groove when the gate is opened.

[0014] The beneficial effects of the utility model are as follows: the device sets a pointer on the valve stem of the gate valve, and one end of the pointer extends horizontally into the stroke groove on the bracket, so that the pointer moves in the stroke groove as the valve stem moves up and down to play an indicating role, so that the operator can judge whether the gate is in place according to the indication of the pointer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0017] Figure 2 is a cross-sectional view of Example 1;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram of the elastic sealing structure of Example 2;

[0020] In the figure, 1-valve body, 11-left valve body, 12-right valve body, 15-stuffing box, 151-first stuffing box, 152-second stuffing box, 16-adjusting plate, 2-valve seat, 21-elastic sealing member, 211-resistance portion, 212-compensation portion, 2-valve seat, 3-gate, 4-bracket, 5-valve stem, 51-connector, 52-locating pin, 6-pointer, 7-pneumatic actuator, 8-gate protection cover. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0022] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0023] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0024] Example 1

[0025] like Figure 1-3As shown, a regulating two-piece knife gate valve comprises a valve body 1, wherein the valve body comprises a left valve body 11 and a right valve body 12 arranged opposite to each other, and a valve seat 2 is arranged between the left valve body 11 and the right valve body 12, and the valve seat 2 cooperates with a gate plate 3 to conduct or cut off the fluid, and further comprises a bracket 4 and a valve stem 5 connected to the bracket 4 and longitudinally displaceable relative to the bracket 4, one end of the valve stem 5 is connected to an operating mechanism, in this embodiment, a pneumatic actuator is adopted, and the other end is connected to the gate plate 3, and the operating mechanism controls the displacement of the valve stem 5 relative to the bracket 4 to conduct or cut off the fluid; the valve stem 5 is linked to a laterally arranged pointer 6, and at least one end of the pointer 6 passes through the bracket 4, and a travel groove for sliding one end of the pointer 6 is arranged on a side of the bracket 4 corresponding to the passing of the pointer 6, and a scale mark is arranged on the side of the travel groove; the fluid flows from left to right.

[0026] One end of the pointer 6 is fixedly connected to the valve stem 5, and the other end penetrates into the travel groove of the bracket 4. Only one end of the pointer penetrates out of the travel of the bracket 4. The side with the travel groove and the scale mark is the observation surface of the bracket 4.

[0027] The valve stem 5 is directly or indirectly connected to the gate 3 through a connector 51, and one end of the pointer 6 is threadedly connected to the connector 51. When the gate 3 cooperates with the valve seat 2 to cut off the fluid, the pointer 6 is located at the lower end of the stroke groove, but not the end point of the stroke groove. The length of the stroke groove is slightly larger than the stroke length of the gate 3.

[0028] Gate protection covers 8 are extended on both sides of the bracket 4. When the gate 3 cooperates with the valve seat 2 to conduct fluid and one end of the pointer 6 slides to the upper end of the stroke groove (but not the upper end point of the stroke groove), the gate 3 moves into the gate protection cover 8.

[0029] A stuffing box 15 is arranged in the valve body 1, and the stuffing box 15 includes a first stuffing box 151 close to the gate plate 3 and a second stuffing box 152 close to the valve stem 5. An annular sealing ring is arranged in the first stuffing box 151, and a U-shaped sealing ring and a positioning frame thereof are arranged in the second stuffing box 152. The positioning frame is embedded in the opening of the U-shaped sealing ring, and an elastic layer is provided on the outside of the positioning frame to generate a supporting force on both sides of the opening of the U-shaped sealing ring.

[0030] The valve seat 2 includes an elastic seal 21 embedded in the valve body 1 , and the elastic seal 21 includes a resistance portion 211 located directly below the gate plate 3 and sealingly matched with the gate plate 3 , and a compensation portion 212 with a convex arc surface located on the side of the resistance portion 211 .

[0031] Furthermore, the upper surface of the elastic seal 21 is flush with the bottom surface of the valve body 1 , and an adjustment plate 16 is provided on the side of the left valve body 11 , and the right side of the adjustment plate 16 limits the left side of the gate plate 3 when the gate plate 3 is closed.

[0032] Example 2

[0033] Embodiment 2 is based on Embodiment 1. In the case where the elastic member 21 remains embedded in the valve body, the upper end of the resistance portion 211 and the upper end of the compensation portion 212 are separated by the valve body to prevent particles in the fluid from entering between the compensation portion 212 and the valve body when the resistance portion 211 is deformed under pressure, so that the compensation portion 212 compensates for the deformation of the resistance portion 211 when the gate plate 3 is opened or closed.

[0034] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A regulating two-piece knife gate valve, comprising a valve body (1), wherein the valve body comprises a left valve body (11) and a right valve body (12) arranged opposite to each other, and a valve seat (2) is arranged between the left valve body (11) and the right valve body (12), wherein the valve seat (2) cooperates with a gate plate (3) to conduct or cut off a fluid, and further comprising a bracket (4) and a valve stem (5) connected to the bracket (4) and longitudinally displaceable relative to the bracket (4), wherein one end of the valve stem (5) is connected to an operating mechanism and the other end is connected to the gate plate (3), wherein the operating mechanism controls the displacement of the valve stem (5) relative to the bracket (4) to conduct or cut off the fluid; characterized in that: The valve stem (5) is linked to a laterally arranged pointer (6), at least one end of the pointer (6) passes through the bracket (4), and a travel groove for sliding one end of the pointer (6) is provided on a side of the bracket (4) corresponding to the side through which the pointer (6) passes.

2. The adjustable two-piece knife gate valve according to claim 1 is characterized in that: A scale mark is arranged on the side of the travel groove.

3. The adjustable two-piece knife gate valve according to claim 1 is characterized in that: One end of the pointer (6) is fixedly connected to the valve stem (5), and the other end passes through the travel groove of the bracket (4).

4. The adjustable two-piece knife gate valve according to claim 1 is characterized in that: The valve stem (5) is connected to the gate plate (3) via a connector (51), and one end of the pointer (6) is connected to the connector (51). When the gate plate (3) cooperates with the valve seat (2) to cut off the fluid, the pointer (6) is located at the lower end of the travel groove.

5. The adjustable two-piece knife gate valve according to claim 1 is characterized in that: Gate plate protection covers (8) are extended and arranged on both sides of the bracket (4).

6. The adjustable two-piece knife gate valve according to claim 1, characterized in that: A stuffing box (15) is arranged in the valve body (1), and the stuffing box (15) includes a first stuffing box (151) close to the gate plate (3) and a second stuffing box (152) close to the valve stem (5). An annular sealing ring is arranged in the first stuffing box (151), and a U-shaped sealing ring and a positioning frame thereof are arranged in the second stuffing box (152), and the positioning frame is embedded in the opening of the U-shaped sealing ring.

7. The adjustable two-piece knife gate valve according to claim 1, characterized in that: The valve seat (2) comprises an elastic sealing member (21) embedded in the valve body (1), the elastic sealing member (21) comprising a resistance portion (211) located directly below the gate plate (3) and sealingly cooperating with the gate plate (3), and a compensation portion (212) having a convex arc surface located on the side of the resistance portion (211).

8. The adjustable two-piece knife gate valve according to claim 7, characterized in that: The upper surface of the elastic sealing member (21) is flush with the bottom surface of the valve body (1).

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