CN210600226U

CN210600226U - A double block bottom valve

Info

Publication number: CN210600226U
Application number: CN201921114879.7U
Authority: CN
Inventors: 施进伟; 吴小康; 杨雪华; 虞戈; 李太平
Original assignee: CNNC Sufa Technology Industry Co Ltd
Current assignee: CNNC Sufa Technology Industry Co Ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-05-22
Anticipated expiration: 2029-07-16

Abstract

This novel two stop valve core of installation in a valve body, play the dual stop sealed stop valve structure that cuts belongs to two bottom valve structures that cut, concretely relates to. The utility model provides a two cut off bottom valves, wherein, includes the valve body, is equipped with the passageway of buckling in the valve body, and the passageway of should buckling is the runner, and the runner is connected with four through-holes that communicate to the outside, and two in these four through-holes that communicate to the outside set up valve rod assembly, and two other water inlets and outlets as the runner, and two valve rod assembly structures are the same, are the form of concatenating in the liquid return circuit. This neotype effect that is showing is: compact structure, and all valves do not have the welding leak source, and valve security and durability all promote greatly.

Description

Double-cutoff bottom valve

Technical Field

This novel two stop valve spools that belong to cut off the bottom valve, concretely relates to two stop valve case of installation in a valve body play the dual stop sealed stop valve structure.

Background

A block valve: the cutoff valve is also called a closed circuit valve and is used for connecting or cutting off a medium in a pipeline. The cut-off valves include gate valves, stop valves, plug valves, ball valves, butterfly valves, diaphragm valves, and the like.

The gate plate and the valve seat of the gate valve are perpendicular to the steam flow direction, and are similar to gates, so the gate valve is called. The flashboard is divided into a flat shape and a wedge shape, and one side of the flashboard is stressed while the other side is not stressed when the valve is closed, so that the force of the flashboard acting on the valve seat is larger, and the force required by opening and closing the valve is also larger. Mechanical, hydraulic or electric driving mechanisms are required to be assembled for opening and closing high-pressure and large gate valves, otherwise the high-pressure and large gate valves are not easy to open and close. In addition, in order to save labor for opening the valve, a bypass pipeline is usually installed on one side of the large-sized gate valve. Before the valve is opened, the small valve on the bypass pipeline is opened, so that the preheating function is realized, and the function of reducing the pressure difference on the two sides of the flashboard is also realized. Gate valves are generally used to block soda, but not to regulate flow, because if the gate is only half open, the non-lifted portion of the lower portion of the gate is subject to the wear and corrosion of the soda in such a situation, causing the contact surface to be less tight after the valve is closed, thereby failing to block. Therefore, the operation for the gate valve should be either fully open or fully closed.

The gate valve has the characteristics of small flow resistance of fluid, linear flow direction of steam and water, small opening and closing torque and labor saving for opening and closing. And the gate valve has a wide range of applications in terms of pressure, temperature, diameter and the like. The gate valve has the defects of complex structure, large height and size, relative friction between sealing surfaces, easy damage and the like.

A gate valve is commonly used as a drain valve on a boiler, and a gate valve made of high-quality materials is also used as a main steam valve. The parallel gate valve with liftable valve rod has valve rod rotating and no lifting, and the flashboard has inner thread in the middle and is lifted or lowered with the rotation of the valve rod. The contact surfaces of the gate valve gate plates are generally in contact with each other at the same time, and only one surface of the gate valve gate plate is in contact with each other.

The contact surface form of a valve core and a valve seat of the stop valve is many, but the appearance and the principle are not changed greatly. The function of the stop valve is to stop the passage of fluid and regulate the magnitude of fluid flow. The materials of the valve core and the valve seat are different according to the properties and characteristics of the fluid.

The valve core and the valve seat are made of steel, alloy steel or cast iron, and stainless steel is also used as the material. In industrial boilers with operating pressures below 1MPa, the shut-off valves used in the feed water systems are usually made of cast steel, while the shut-off valves used in the steam passages are usually made of ductile iron or cast steel.

When installing the stop valve, special attention should be paid to the flow direction of water or steam, which is commonly called low-in and high-out, namely, fluid enters from the lower part of the valve core and then flows out from the middle of the valve core and the valve seat.

Compared with a gate valve, the stop valve is simple in structure, small in height and size, small in relative friction of a sealing surface and good in sealing performance. However, the shutoff valve has a large flow resistance and a large starting torque. Therefore, its diameter is generally limited to Φ 400 mm.

The stop valve is the most widely used valve for industrial boiler and petrochemical equipment, and is used mainly in main steam valve, water supply regulating valve, steam inlet and outlet valve of steam separating cylinder, hydrogenation valve and other technological steam pipeline.

A double-valve integrated bottom valve is often used on a petrochemical device and is used for double cutoff of a medium at the tail end of a high-pressure pipeline. The bottom valve is usually connected together by two stop valves through welding short pipes, so that the size is large, and leakage hidden danger exists at the welding connection position. There is therefore a need for a compact, weld leak-free double block bottom valve, which is not known in the prior art.

Novel content

Aiming at the defects of the prior art, the novel double-cutoff bottom valve structure is compact in structure and free of welding leakage points.

This is novel to realize like this: the utility model provides a two cut off bottom valves, wherein, includes the valve body, is equipped with the passageway of buckling in the valve body, and the passageway of should buckling is the runner, and the runner is connected with four through-holes that communicate to the outside, and two in these four through-holes that communicate to the outside set up valve rod assembly, and two other water inlets and outlets as the runner, and two valve rod assembly structures are the same, are the form of concatenating in the liquid return circuit.

A double block bottom valve as described above wherein the angle between the central axes of the two stem assemblies is 60 °.

The double-cutoff bottom valve comprises a valve rod arranged in the center of the valve rod assembly, a valve clack is arranged at the foremost end of the valve rod, the valve clack is used for controlling the opening and closing of a valve, a valve cover is arranged at the outermost end, in contact with a valve body, of the valve rod assembly, the valve cover is used for sealing and isolating the inner space and the outer space of the valve body, the valve rod penetrates through the valve cover, and a hand wheel is arranged at the uppermost end of the valve rod assembly.

A double block bottom valve as described above, wherein a seat sealing surface is provided on the valve flap and flow passage contact surface.

A two shut off bottom valve as above, wherein, leave the clearance between valve gap and the valve rod, the bottom of valve gap sets up the arch towards the valve rod, and the top of valve gap sets up the gland, and valve rod, valve gap and gland form the annular space around the valve rod jointly, set up the valve rod packing in this space.

The double block bottom valve is characterized in that a gland nut is further arranged outside the gland and used for pressing the gland.

According to the double-cutoff bottom valve, the valve cover is fixedly connected with the outer surface of the valve body through the sealing welding and the sealing gasket.

A double block bottom valve as described above wherein a nut is provided at the topmost end of the valve stem.

This neotype effect that is showing is: compact structure, and all valves do not have the welding leak source, and valve security and durability all promote greatly.

Drawings

FIG. 1 is a schematic structural view of a double block bottom valve provided by the present invention;

in the figure: 1. a valve body; 2. a valve flap; 3. a valve stem; 4. a sealing gasket; 5. a valve cover; 6. valve stem packing; 7. a gland; 8. a gland nut; 9. a hand wheel; 10. a nut; 11. sealing and welding; 12. valve seat sealing surface

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in the attached figure 1, the double-cutoff bottom valve comprises a valve body, wherein a bent channel is arranged in the valve body, the bent channel is a flow channel, the flow channel is connected with four through holes which are communicated with the outside, two of the four through holes which are communicated with the outside are provided with valve rod assemblies, the other two through holes are used as water inlets and water outlets of the flow channel, the two valve rod assemblies have the same structure, and the two valve rod assemblies are connected in series in a liquid loop.

The double-cut-off bottom valve is a complex of two cut-off valves, and the valve cores of the two cut-off valves are arranged in one valve body to play a role in double cutting off media. The concrete description is as follows: 1. the valve body is internally provided with a channel for medium circulation and two middle cavities for installing the valve cover and the valve core, threads are processed inside the valve body, 12 the sealing surface of the valve seat is positioned at the bottom of the middle cavity of the valve body, 2 the valve clack is driven by 3. the valve rod moves up and down 5. the threaded end of the valve cover is screwed into the middle cavity of the valve body, the threads provide the sealing force of 4 sealing gaskets, 6 the valve rod packing provides the sealing force by 7 pressing covers, the sealing force of the pressing covers is from the thread screwing force of the pressing covers and the valve cover, and 8 pressing covers are screwed on the. The 9 handwheel is sleeved on the valve rod and fixed by 10 nuts. The valve clack is guided by the inner cavity of the valve cover, and the valve cover adopts a double-sealing structure, namely a sealing washer and sealing welding.

The structure technology for realizing the novel purpose is as follows:

1) two valve seat sealing surfaces are processed in the valve body, and when the two valve clacks are closed simultaneously, the double-cutoff function is achieved.

2) The valve clack is guided by the inner cavity of the valve cover, and can be accurately centered and sealed.

3) The valve cover is sealed by adopting a sealing washer and sealing welding double seal.

4) The two valve rods form an included angle of 60 degrees, so that the length of the valve structure is reduced as much as possible, and the valve is convenient to operate.

Claims

1. A double cut-off bottom valve, characterized in that: it comprises a valve body (1), and a bent channel is arranged in the valve body (1), and the bent channel is a flow channel, and the flow channel is connected with four external communication channels. Two of the four externally communicating through holes are provided with valve stem components, and the other two are used as the water inlet and outlet of the flow channel. The two valve stem components have the same structure and are connected in series in the liquid circuit.

2 . The double block bottom valve according to claim 1 , wherein the included angle between the central axes of the two valve stem assemblies is 60°. 3 .

3. A double block bottom valve as claimed in claim 2, characterized in that: any one of the two valve stem assemblies comprises the following structure, a valve stem (3) arranged in the center of the valve stem assembly, A valve disc (2) is arranged at the front end of the valve stem (3), and the opening and closing of the valve disc (2) is used to control the opening and closing of the valve, and a valve cover ( 5), the valve cover (5) is used to seal and isolate the inner and outer space of the valve body (1), the valve stem (3) passes through the valve cover (5), and a handwheel (9) is arranged at the uppermost end.

4. A double block bottom valve according to claim 3, characterized in that: a valve seat sealing surface (12) is provided on the contact surface of the valve flap (2) and the flow channel.

5. A double cut-off bottom valve as claimed in claim 4, characterized in that: there is a gap between the valve cover (5) and the valve stem (3), and the bottom end of the valve cover (5) is arranged toward the valve stem ( 3), the top of the valve cover (5) is provided with a gland (7), the valve stem (3), the valve cover (5) and the gland (7) together form an annular gap around the valve stem (3). The valve stem packing (6) is arranged in the gap.

6. A double-block bottom valve as claimed in claim 5, characterized in that a gland nut (8) is provided outside the gland (7), and the gland nut (8) is used to compress the gland (7). 7).

7 . The double block bottom valve according to claim 6 , wherein the valve cover ( 5 ) and the outer surface of the valve body ( 1 ) are fixedly connected by sealing welding ( 11 ) and sealing gasket ( 4 ). 8 .

8. A double-block bottom valve according to claim 7, characterized in that: a nut (10) is provided at the topmost end of the valve stem (3).