Large-diameter gate valve

Abstract

The utility model discloses a large-diameter gate valve which comprises a valve body, a gate plate is installed in the valve body, a valve seat is installed in the valve body, according to the large-diameter gate valve, a valve cover is aligned to the valve seat, a first nut is screwed in a rotating mode to be connected with a first full-thread stud in a threaded mode, and the valve cover is convenient to fixedly install. Through the design of the first full-thread stud, the first nut and the valve deck, disassembly and assembly can be conveniently conducted, maintenance and replacement are facilitated, the overall disassembly and replacement cost is reduced, the first full-thread stud is driven to be disassembled by rotating and disassembling the first nut, and the valve seat is conveniently disassembled; the second nut is screwed to be in threaded connection with the double-end stud, the third nut is screwed to be in threaded connection with the double-end bolt, the support is fixed and installed conveniently, the second nut and the third nut are disassembled through rotation, the double-end stud and the double-end bolt are driven to be disassembled, and the support and the bevel gear are disassembled conveniently. The design of the composite gasket, the filler, the filler pressing sleeve and the filler pressing plate can improve the sealing performance and prevent water from overflowing between the valve body and the valve cover and between the valve cover and the support.

Description

TECHNICAL FIELD

[0001] The utility model relates to water valve device technical field, concretely is a large diameter gate valve. BACKGROUND

[0002] When the American standard large diameter gate valve is closed, the pressure of liquid on the gate plate is very large, and it is impossible to accurately calculate whether it is completely closed by manual, and the valve is often still closed after completely closing.

[0003] At present, when the valve is closed, the valve rod drives the valve plate to move downward together, an over-torque limiting device is installed at the top end of the valve rod, a valve rod nut is sleeved on the upper part of the valve rod, and the bottom of the valve rod nut is in contact with the connecting flange of the gate valve, the valve rod can move up and down in the valve rod nut, and the position of the valve rod nut is fixed, when the valve rod moves downward to the completely closed position of the gate valve, the bottom of the over-torque limiting sleeve is in contact with the top of the valve rod nut, and the valve rod nut blocks the over-torque limiting sleeve to prevent it from continuing to move downward, thereby protecting the sealing ring of the valve plate, and the over-torque limiting device can actively adjust the limiting position by reducing or increasing the number of limiting adjustment washers.

[0004] For example, the over-torque large-diameter limitable American standard gate valve disclosed in the authorized public number CN205423887U includes an American standard gate valve body, an over-torque limiting device, an over-torque limiting sleeve, a screw rod, a nut, a stop washer, and a limiting adjustment washer, a threaded hole is formed in the top of the valve rod of the American standard gate valve body, a stepped hole is formed in the over-torque limiting sleeve, the diameter of the large hole of the stepped hole matches the diameter of the valve rod, one end of the screw rod is screwed into the threaded hole in the top of the valve rod, the limiting adjustment washer, the over-torque limiting sleeve, and the stop washer pass through the screw rod in sequence, and are fastened at the top of the valve rod by the nut. The limiting adjustment washer is a stainless steel thin washer. However, such an over-torque large-diameter limitable American standard gate valve is not convenient to disassemble and assemble the valve cover, increases the maintenance cost, and is not convenient to disassemble and assemble the support.

[0005] From the above-mentioned existing patent document, it can be seen that the valve cover is not convenient to disassemble and assemble, the maintenance cost is increased, and the support is not convenient to disassemble and assemble, therefore, the existing technology needs to be improved. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a large-diameter gate valve to solve the problems that the valve cover is not convenient to disassemble and assemble, the maintenance cost is increased, and the support is not convenient to disassemble and assemble.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: A large -diameter gate valve, the inside installation of valve body is installed with the flashboard, the inside installation of valve body is installed with the valve seat, the inside installation of valve body is installed with the valve rod, the upper end of valve body is installed with the first full thread stud, the end of first full thread stud is connected with the first nut through the thread, the outside of first full thread stud is sleeved with the composite gasket, the outside of first full thread stud is sleeved with the valve cover, the upper end of valve cover is filled with the packing in, the inside installation of valve cover is installed with the partition ring, the outside of valve cover is sleeved with the stud bolt, the end of stud bolt is connected with the second nut through the thread, the inside installation of valve cover is installed with the packing pressing sleeve, the upper end of packing pressing sleeve is closely attached with the packing pressing plate, the inside of packing pressing plate is sleeved with the stud bolt, the outside of stud bolt is sleeved with the gasket, the end of stud bolt is connected with the third nut through the thread, the inside fixed connection of packing pressing plate is installed with the support, the upper end of support is installed with the spring pad, the inside of spring pad is sleeved with the second full thread stud, the end of second full thread stud is connected with the fourth nut through the thread.

[0008] Preferably, the upper end of the flashboard is installed with a valve seat, the upper end of the partition ring is closely attached with a packing pressing sleeve, by aligning the valve cover with the valve seat, rotating the first nut to threadedly connect the first full thread stud, the valve cover is conveniently fixed and installed.

[0009] Preferably, the inside of the composite gasket is sleeved with a valve rod, the upper end of the composite gasket is tightly pressed with a valve cover, the design of the first full thread stud, the first nut and the valve cover can facilitate disassembly and assembly for maintenance and replacement, thereby reducing the overall disassembly and replacement cost.

[0010] Preferably, the upper end of the valve seat is connected with a valve rod, the inside of the valve cover is sleeved with the valve rod, by rotating and removing the first nut to drive the first full thread stud to be removed, the valve seat is conveniently removed.

[0011] Preferably, the upper end of the valve cover is closely attached with a support, the inside of the support is sleeved with a packing pressing sleeve, by rotating and tightly screwing the second nut to threadedly connect the stud bolt and the third nut to threadedly connect the stud bolt, the support is conveniently fixed and installed.

[0012] Preferably, the lower end surface of the packing pressing plate is closely attached with a support, the upper end inside of the support is installed with a bevel gear, by rotating and removing the second nut and the third nut to drive the stud bolt and the stud bolt to be removed, the support and the bevel gear are conveniently removed.

[0013] Preferably, the upper end of the valve body is closely attached with a composite gasket, the upper end of the packing is closely attached with a partition ring, the design of the composite gasket, the packing, the packing pressing sleeve and the packing pressing plate can improve the sealing property to prevent water overflow between the valve body and the valve cover and between the valve cover and the support.

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

[0015] 1. The utility model discloses a valve cover is aligned to the valve seat, and the first all thread stud is connected by rotating and tightening the first nut, and the first all thread stud, the first nut and the valve cover design can be conveniently disassembled to maintain and replace, reduce the overall disassembly and replacement cost, and the first all thread stud is removed by rotating and removing the first nut, and the valve seat is conveniently removed.

[0016] 2. The utility model discloses a bracket is fixed and installed by rotating and tightening the second nut screw connection stud and the third nut screw connection stud bolt, and the bracket and bevel gear are conveniently removed by rotating and removing the second nut and the third nut, driving stud and stud bolt removal, the design of composite gasket, packing, packing sleeve and packing plate can improve the sealing property, prevent the overflow between valve body and valve cover, between valve cover and bracket. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic view of the utility model;

[0018] Figure 2 It is the valve cover enlarged sectional view of the utility model;

[0019] Figure 3 It is the bracket enlarged view of the utility model;

[0020] Figure 4 It is the composite gasket overhead enlarged view of the utility model.

[0021] In the drawing: 1 valve body, 2 gate, 3 valve seat, 4 valve stem, 5 first all thread stud, 6 first nut, 7 composite gasket, 8 valve cover, 9 packing, 10 spacer ring, 11 stud, 12 second nut, 13 packing sleeve, 14 packing plate, 15 stud bolt, 16 gasket, 17 third nut, 18 bracket, 19 spring pad, 20 second all thread stud, 21 fourth nut, 22 bevel gear. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0023] Please refer to Figures 1-4, one large-bore gate valve in the drawing, including the valve body 1, the inside of the valve body 1 is installed with the gate plate 2, the inside of the valve body 1 is installed with the valve seat 3, the inside of the valve body 1 is installed with the valve stem 4, the upper end of the valve body 1 is installed with the first full thread stud 5, the end of the first full thread stud 5 is connected with the first nut 6 through the thread, the outer side of the first full thread stud 5 is sleeved with the composite gasket 7, the outer side of the first full thread stud 5 is sleeved with the valve cover 8, the upper end of the valve cover 8 is filled with the packing 9 inside, the inside of the valve cover 8 is installed with the partition ring 10, the outer side of the valve cover 8 is sleeved with the double-headed stud 11, the end of the double-headed stud 11 is connected with the second nut 12 through the thread, the inside of the valve cover 8 is installed with the packing pressing sleeve 13, the upper end of the packing pressing sleeve 13 is close to the packing pressing plate 14, the inside of the packing pressing plate 14 is sleeved with the double-headed bolt 15, the outer side of the double-headed bolt 15 is sleeved with the gasket 16, the end of the double-headed bolt 15 is connected with the third nut 17 through the thread, the inner side of the packing pressing plate 14 is fixedly connected with the support 18, the upper end of the support 18 is installed with the spring pad 19, the inside of the spring pad 19 is sleeved with the second full thread stud 20, the end of the second full thread stud 20 is connected with the fourth nut 21 through the thread.

[0024] In order to disassemble the valve cover 8, the upper end of the gate plate 2 is installed with the valve seat 3, the upper end of the partition ring 10 is close to the packing pressing sleeve 13, by aligning the valve cover 8 with the valve seat 3, rotating the first nut 6 to connect the first full thread stud 5, it is convenient to fix and install the valve cover 8, the inside of the composite gasket 7 is sleeved with the valve stem 4, the upper end of the composite gasket 7 is pressed with the valve cover 8, the design of the first full thread stud 5, the first nut 6 and the valve cover 8 can facilitate disassembly and replacement for maintenance, reduce the overall disassembly and replacement cost, the upper end of the valve seat 3 is connected with the valve stem 4, the inside of the valve cover 8 is sleeved with the valve stem 4, by rotating to remove the first nut 6 to drive the first full thread stud 5 to remove, it is convenient to remove the valve seat 3.

[0025] In order to disassemble the support 18, the upper end of the valve cover 8 is close to the support 18, the inside of the support 18 is sleeved with the packing pressing sleeve 13, by rotating to tighten the second nut 12 to connect the double-headed stud 11 and the third nut 17 to connect the double-headed bolt 15, it is convenient to fix and install the support 18, the lower end of the packing pressing plate 14 is close to the support 18, the upper end of the support 18 is installed with the bevel gear 22 inside, by rotating to remove the second nut 12 and the third nut 17, drive the double-headed stud 15 and the double-headed bolt 15 to remove, it is convenient to remove the support 18 and the bevel gear 22, the upper end of the valve body 1 is close to the composite gasket 7, the upper end of the packing 9 is close to the partition ring 10, the design of the composite gasket 7, the packing 9, the packing pressing sleeve 13 and the packing pressing plate 14 can improve the sealing performance, prevent water overflow between the valve body 1 and the valve cover 8, between the valve cover 8 and the support 18.

[0026] The large-diameter gate valve, by aligning the bonnet 8 to the valve seat 3, rotates the first nut 6 to connect the first full threaded stud 5, which is convenient to fix and install the bonnet 8, the design of the first full threaded stud 5, the first nut 6 and the bonnet 8 can facilitate disassembly and assembly, so as to maintain and replace, reduce the overall disassembly and replacement cost, by rotating and removing the first nut 6 to drive the first full threaded stud 5 to remove, which is convenient to remove the valve seat 3; by rotating and tightening the second nut 12 to connect the stud 11 and the third nut 17 to connect the stud bolt 15, it is convenient to fix and install the bracket 18, by rotating and removing the second nut 12 and the third nut 17 to drive the stud 15 and the stud bolt 15 to remove, which is convenient to remove the bracket 18 and the bevel gear 22, the design of the composite gasket 7, the packing 9, the packing press sleeve 13 and the packing press plate 14 can improve the sealing performance, prevent water overflow between the valve body 1 and the bonnet 8, and prevent water overflow between the bonnet 8 and the bracket 18.

[0027] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A large-bore gate valve comprising a valve body (1), characterized in that: The inside of the valve body (1) is installed with a gate (2), the inside of the valve body (1) is installed with a valve seat (3), the inside of the valve body (1) is installed with a valve stem (4), the upper end of the valve body (1) is installed with a first full thread stud (5), the end of the first full thread stud (5) is connected with a first nut (6) through threads, the outer side of the first full thread stud (5) is sleeved with a composite gasket (7), the outer side of the first full thread stud (5) is sleeved with a valve cover (8), the upper end inside of the valve cover (8) is filled with a packing (9), the inside of the valve cover (8) is installed with a partition ring (10), the outer side of the valve cover (8) is sleeved with a double-headed stud (11), the end of the double-headed stud (11) is connected with a second nut (12) through threads, the inside of the valve cover (8) is installed with a packing pressing sleeve (13), the upper end of the packing pressing sleeve (13) is tightly attached with a packing pressing plate (14), the inside of the packing pressing plate (14) is sleeved with a double-headed bolt (15), the outer side of the double-headed bolt (15) is sleeved with a gasket (16), the end of the double-headed bolt (15) is connected with a third nut (17) through threads, the inner side of the packing pressing plate (14) is fixedly connected with a bracket (18), the upper end of the bracket (18) is installed with a spring pad (19), the inside of the spring pad (19) is sleeved with a second full thread stud (20), the end of the second full thread stud (20) is connected with a fourth nut (21) through threads.

2. A large-bore gate valve according to claim 1, characterized in that: The upper end of the gate (2) is installed with a valve seat (3), the upper end of the partition ring (10) is tightly attached with a packing pressing sleeve (13).

3. A large-bore gate valve according to claim 1, characterized in that: The inside of the composite gasket (7) is sleeved with a valve stem (4), the upper end of the composite gasket (7) is tightly pressed with a valve cover (8).

4. A large-bore gate valve according to claim 1, characterized in that: The upper end of the valve seat (3) is connected with a valve stem (4), the inside of the valve cover (8) is sleeved with a valve stem (4).

5. A large-bore gate valve according to claim 1, characterized in that: The upper end of the valve cover (8) is tightly attached with a bracket (18), the inside of the bracket (18) is sleeved with a packing pressing sleeve (13).

6. A large-bore gate valve according to claim 1, characterized in that: The lower end face of the packing pressing plate (14) is tightly attached with a bracket (18), the upper end inside of the bracket (18) is installed with a bevel gear (22).

7. A large-bore gate valve as defined in claim 1, wherein: The upper end of the valve body (1) is tightly attached with a composite gasket (7), the upper end of the packing (9) is tightly attached with a partition ring (10).

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