Double-pneumatic stop valve

Abstract

The utility model discloses a double pneumatic stop valve which comprises a valve body, a water passing channel is formed in the valve body, a valve cover is arranged at the top of the valve body, a valve rod is arranged in the middle of the valve body in a sliding mode, a valve clack is arranged at the lower end of the valve rod, an annular clamping groove is formed in the bottom of the valve clack, and a sealing plate is clamped in the annular clamping groove. The support is arranged at the upper end of the valve cover to install the first pneumatic actuator, the output end of the first pneumatic actuator is in transmission connection with the top of the valve rod, the first pneumatic actuator drives the valve rod to slide up and down, then opening and closing of the stop valve are achieved, operation is easy and convenient, time and labor are saved, and control is convenient; when the main valve channel breaks down, the bypass valve is started to drive the second valve rod and the second valve clack in the bypass valve to act to open the bypass loop, liquid flows to the water outlet of the main valve channel through the bypass loop, a new water flow channel is formed, and normal use of the stop valve is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve, especially a double pneumatic stop valve. BACKGROUND

[0002] The stop valve is a kind of valve with large use amount, and there are many structural forms, which can adapt to the requirements of different working conditions;The stop valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive medium;The opening stroke of the valve stem of the stop valve is relatively short, and the opening height is generally only 1 / 4 of the diameter of the valve seat passage;The friction between the sealing surfaces of the stop valve is small, and it has very reliable shut-off function.Usually, the stop valve has only one sealing surface, so the manufacturing process is good, and it is easy to maintain, so the stop valve is very popular in industrial systems.

[0003] But the ordinary stop valve is inconvenient to operate, and the hand wheel needs to be manually rotated to adjust the valve stem when opening and closing, and it is used frequently, which can cause wear of the valve disc and the boss when they are frequently contacted, causing leakage at the connection, thereby affecting the sealing performance of the stop valve, reducing the service life of the valve disc, and when the main valve passage of the stop valve fails, it is not convenient to adjust the bypass branch, causing the stop valve to be unable to be normally used.

[0004] Therefore, it is necessary to provide a double pneumatic stop valve to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a double pneumatic stop valve to solve the problems in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a double pneumatic stop valve, comprising a valve body, a water passage is formed in the valve body, a valve cover is arranged at the top of the valve body, a valve stem is slidably arranged in the middle of the valve body, a valve disc is arranged at the lower end of the valve stem, an annular clamping groove is formed in the bottom of the valve disc, a sealing plate is clamped in the annular clamping groove, the sealing plate is tightly combined with the boss on the water passage in the middle of the valve body, the upper end of the valve stem extends above the valve cover, a support is arranged at the top of the valve cover, the top of the valve stem is located in the support, a clamping block is arranged in the support, a pin shaft is arranged at the lower end of the clamping block, the pin shaft is inserted into the top of the valve cover, a packing is inserted into the middle of the clamping block, the packing is sleeved on the outer circumferential surface of the valve stem, a first pneumatic actuator is arranged at the top of the support, the output end of the first pneumatic actuator is in transmission connection with the top of the valve stem, a bypass valve is arranged at the bottom of the valve body, and the bypass valve is a second pneumatic actuator.

[0007] As one preferred technical scheme of the utility model, the valve stem outer circumferential surface lower end is provided with a valve clack nut, the valve stem lower end is connected in the valve clack through valve clack nut screw thread.

[0008] As one preferred technical scheme of the utility model, the valve stem outer circumferential surface lower end is provided with a valve clack nut, the valve stem lower end is connected in the valve clack through valve clack nut screw thread.

[0009] As one preferred technical scheme of the utility model, the valve clack top is provided with a positioning sheet.

[0010] As one preferred technical scheme of the utility model, the valve clack bottom middle position is provided with a convex column, the convex column outer circumferential surface is provided with external thread, the convex column is provided with a sealing pressing plate, the convex column is provided with a first nut, the convex column is provided with a first split pin.

[0011] As one preferred technical scheme of the utility model, the filler top is provided with a filler gland, the filler gland is provided with a pressing block, the pressing block, filler gland and clamping block are provided with a loose bolt, the loose bolt bottom is provided with a second split pin, the loose bolt top is provided with a nut.

[0012] As one preferred technical scheme of the utility model, the valve body and valve cover are provided with a middle gasket.

[0013] As one preferred technical scheme of the utility model, the valve cover and valve body connecting place four corners are provided with a stud, the stud top penetrates valve body and valve cover and extends to the upper, the stud top is provided with a second nut.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] The utility model discloses a double pneumatic stop valve, the utility model discloses a support is established to the first pneumatic actuator on the valve cover top to install, make the output of first pneumatic actuator and the top of valve stem drive connection, through the first pneumatic actuator drive valve stem slide up and down, and then realize the opening and closing of stop valve, simple and convenient operation, save time and effort, control conveniently, install the packing sleeve on the outer circumferential surface of valve stem in the support, the connection of valve stem and support and valve cover is sealed, the sealing plate and the boss cooperation in the middle part of water passage are set up in the bottom of valve clack and open and close the water passage of stop valve, on one hand strengthen the sealing performance of valve clack and boss, prevent the leakage of liquid when stop valve is in the closed state via the boss and valve clack junction, on the other hand make valve clack not directly contact with boss, reduce the wear and tear of valve clack, when the sealing plate is used for a long time and wears and leaks, only need to replace sealing plate and do not need to replace valve clack, and then prolong the service life of valve clack, save the cost, adjust the pressure in the stop valve through bypass valve, and then protect the stop valve, when the main valve passage fails, the bypass valve starts to drive the second valve stem and second valve clack in it to open the bypass loop, so that the liquid flows to the water outlet of main valve passage via the bypass loop, forms new water flow channel, guarantees the normal use of stop valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model is further described below in connection with the drawings and examples.

[0017] Figure 1 It is the overall structure of the utility model section view;

[0018] Figure 2 It is the overall structure left view of the utility model.

[0019] In the drawing: 1, valve body;2, first open pin;3, first nut;4, sealing pressure plate;5, sealing plate;6, valve clack;7, split ring;8, valve clack nut;9, positioning piece;10, valve stem;11, middle gasket;12, stud;13, valve cover;14, packing;15, second nut;16, second open pin;17, pin shaft;18, loose bolt;19, packing gland;20, bypass valve;21, support;22, first pneumatic actuator. DETAILED DESCRIPTION

[0020] The embodiments of the utility model are described below with reference to the drawings. In this process, to ensure the explicitness and convenience of the description, we can exaggerate the width of the lines or the size of the constituent elements in the drawings.

[0021] In addition, the terms in the following are defined based on the functions in the utility model, which can be different according to the intention or custom of the user or the user. Therefore, these terms are defined based on the whole content of the specification.

[0022] As Figure 1 and Figure 2 shown, a double pneumatic stop valve, comprising a valve body 1, a water passage is opened in the valve body 1, the valve body 1 is provided with a valve cover 13 at the top, a middle gasket 11 is arranged between the valve body 1 and the valve cover 13, the connection between the valve body 1 and the valve cover 13 is sealed by the middle gasket 11 to prevent water leakage through the connection between the two, the valve cover 13 and the valve body 1 are connected at four corners, and a stud 12 is inserted therein, the stud 12 extends upward through the valve body 1 and the valve cover 13, the second nut 15 is threadedly connected to the top of the stud 12, and the valve cover 13 is locked and fixed on the top of the valve body 1 by cooperation of the stud 12 and the second nut 15.

[0023] The valve body 1 is slidably arranged in the middle, the valve stem 10 is arranged in the middle, the outer circumferential surface of the valve stem 10 is provided with a valve nut 8 at the lower end, the valve stem 10 is provided with a valve 6 at the lower end, the valve stem 10 is threadedly connected in the valve 6 through the valve nut 8, the part of the valve stem 10 that penetrates into the valve 6 is provided with a groove, the split ring 7 is clamped in the groove, the split ring 7 is located below the valve nut 8, the valve 6 is provided with a positioning piece 9 at the top, the valve nut 8 is positioned and installed, the valve 6 is provided with an annular clamping groove at the bottom, the sealing plate 5 is clamped in the annular clamping groove, the convex column is provided at the middle position of the bottom of the valve 6, the outer thread is opened on the outer circumferential surface of the convex column, the sealing plate 4 is sleeved on the convex column, the first nut 3 is threadedly connected to the convex column, the sealing plate 4 is pressed against the bottom of the sealing plate 5 through the first nut 3, the first split pin 2 is inserted into the convex column, the opening and closing of the water passage is realized by cooperation of the sealing plate 5 and the convex column on the water passage in the middle of the valve body 1, the sealing plate 5 is tightly attached to the convex column, the sealing property is improved, the sealing effect of the water passage is better, and leakage is prevented.

[0024] The upper end of the valve stem 10 extends through the valve cover 13 to above it, the top of the valve cover 13 is provided with a bracket 21, the top of the valve stem 10 is located in the bracket 21, a clamping block is arranged in the bracket 21, the lower end of the clamping block is provided with a pin shaft 17, the lower end of the pin shaft 17 is inserted into the top of the valve cover 13, a packing 14 is inserted into the middle of the clamping block, the packing 14 is sleeved on the outer circumferential surface of the valve stem 10, the top of the packing 14 is provided with a packing gland 19, the packing gland 19 is provided with a pressing block, the pressing block, the packing gland 19 and the clamping block are inserted with a loose bolt 18, the bottom of the loose bolt 18 is inserted with a second open pin 16, the top of the loose bolt 18 is threadedly connected with a nut, the packing 14 is tightly fixed by cooperation of the loose bolt 18 and the nut, the top of the bracket 21 is provided with a first pneumatic actuator 22, the output end of the first pneumatic actuator 22 is drivingly connected with the top of the valve stem 10, the valve stem 10 is driven to slide up and down by the first pneumatic actuator 22, thereby realizing opening and closing of the stop valve, the bottom of the valve body 1 is provided with a bypass valve 20, the bypass valve 20 is a second pneumatic actuator, the pressure in the stop valve is adjusted by the bypass valve 20, thereby protecting the stop valve, when the main valve channel fails, the bypass valve 20 is started to drive the second valve stem and the second valve flap in it to open the bypass circuit, so that the liquid flows to the water outlet of the main valve channel through the bypass circuit, forming a new water flow channel, ensuring normal use of the stop valve.

[0025] Specifically, the first pneumatic actuator 22 is installed by arranging the bracket 21 on the upper end of the valve cover 13, so that the output end of the first pneumatic actuator 22 is drivingly connected with the top of the valve stem 10, the valve stem 10 is driven to slide up and down by the first pneumatic actuator 22, thereby realizing opening and closing of the stop valve, which is simple and convenient to operate, saves time and effort, and is easy to control. The packing 14 is installed in the bracket 21 and sleeved on the outer circumferential surface of the valve stem 10, which seals the connection between the valve stem 10, the bracket 21 and the valve cover 13. The sealing plate 5 arranged at the bottom of the valve flap 6 cooperates with the boss in the middle of the water passage to open and close the water passage of the stop valve. On the one hand, it strengthens the sealing performance of the valve flap 6 and the boss, preventing liquid from leaking through the connection between the boss and the valve flap 6 when the stop valve is in the closed state. On the other hand, the valve flap 6 does not directly contact the boss, reducing the wear of the valve flap 6. When the sealing plate 5 is worn out after a long period of use, it only needs to be replaced, without the need to replace the valve flap 6, thereby prolonging the service life of the valve flap 6 and saving costs. The pressure in the stop valve is adjusted by the bypass valve 20, thereby protecting the stop valve. When the main valve channel fails, the bypass valve 20 is started to drive the second valve stem and the second valve flap in it to open the bypass circuit, so that the liquid flows to the water outlet of the main valve channel through the bypass circuit, forming a new water flow channel, ensuring normal use of the stop valve.

[0026] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A double pneumatic globe valve characterized by: The utility model provides a valve, including valve body (1), the water passage is seted up in valve body (1), the valve cover (13) is provided at the top of valve body (1), the valve rod (10) is slidably arranged in the middle part of valve body (1), the valve clapper (6) is provided at the lower end of valve rod (10), the annular clamping groove is seted up in the bottom of valve clapper (6), the sealing plate (5) is clamped in the annular clamping groove, the sealing plate (5) is tightly combined with the boss on the water passage in the middle part of valve body (1), the valve rod (10) upper end extends to above the valve cover (13) through the valve cover (13), the support (21) is provided at the top of valve cover (13), the valve rod (10) top is located in the support (21), the clamping block is provided in the support (21), the pin shaft (17) is provided at the lower end of clamping block, the pin shaft (17) lower end is inserted in the top of valve cover (13), the filler (14) is inserted in the middle part of clamping block, the filler (14) is sleeved on the outer circumferential surface of valve rod (10), the first pneumatic actuator (22) is provided at the top of support (21), the output of first pneumatic actuator (22) is transmission connection with the top of valve rod (10), the bypass valve (20) is provided at the bottom of valve body (1), the bypass valve (20) is second pneumatic actuator.

2. A dual pneumatic globe valve according to claim 1, wherein: The valve clapper nut (8) is arranged at the lower end of the outer circumferential surface of the valve rod (10), and the valve rod (10) is screwed into the valve clapper (6) through the valve clapper nut (8).

3. A dual pneumatic globe valve according to claim 1, wherein: The part of the valve rod (10) that is deeply inserted into the valve clapper (6) is provided with a groove, and the split ring (7) is clamped in the groove.

4. A dual pneumatic globe valve according to claim 1, wherein: The positioning piece (9) is arranged at the top of the valve clapper (6).

5. A dual pneumatic globe valve according to claim 1, wherein: The convex column is arranged at the middle position of the bottom of the valve clapper (6), an external thread is arranged on the outer circumferential surface of the convex column, the sealing pressing plate (4) is sleeved on the convex column, the first nut (3) is screwed on the convex column, and the first split pin (2) is inserted on the convex column.

6. A dual pneumatic globe valve according to claim 1, wherein: The filler pressing cover (19) is arranged at the top of the filler (14), the pressing block is arranged on the filler pressing cover (19), the loose bolt (18) is inserted in the pressing block, the filler pressing cover (19) and the clamping block, the second split pin (16) is inserted at the bottom of the loose bolt (18), and the screw cap is screwed at the top of the loose bolt (18).

7. A dual pneumatic globe valve according to claim 1, wherein: The middle gasket (11) is arranged between the valve body (1) and the valve cover (13).

8. A dual pneumatic globe valve according to claim 1, wherein: The stud (12) is inserted at the four corners of the connection between the valve cover (13) and the valve body (1), the stud (12) extends to the top through the valve body (1) and the valve cover (13), and the second nut (15) is screwed at the top of the stud (12).

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