CN212028724U - Lifting type check valve capable of reducing water hammer damage - Google Patents

Abstract

A lifting type check valve capable of reducing water hammer hazards comprises a valve body, a valve seat, a valve cover, a bushing, a valve core, a compression spring, a sealing element and a connecting piece. The characteristics are as follows: a small check valve sealed by a small steel ball is arranged in the sealing end of the lifting check valve core. The small check valve is formed by taking the sealing end of the valve core of the lifting check valve as a valve body and adding an outer hexagonal hollow plug and a small steel ball. An inner hexagonal hollow plug and a filter screen are also arranged at the inlet of the small check valve. When water hammer occurs, the pressure is relieved through the small check valve, so that the water hammer phenomenon and damage are reduced; compared with other measures for preventing and relieving water hammer, the method has the advantages of not increasing the volume of the original equipment or pipeline and having the lowest cost.

Description

Lifting type check valve capable of reducing water hammer damage

Technical Field

The utility model relates to a single current valve in industrial machinery, fluid equipment or pipeline.

Background

In fluid equipment such as petrochemical industry, steam power generation, water supply and drainage and the like, the phenomena of flow speed change and pressure fluctuation inevitably exist; particularly, in a fluid device or a pipeline in which the check valve is installed, a water hammer phenomenon caused by the sudden closing of the check valve is inevitable. The abnormal pressure generated by water attack has a great influence on equipment or pipelines, and can cause severe vibration and deformation if the abnormal pressure is light and cause damage and accidents of parts if the abnormal pressure is heavy. Although people can adopt measures of additionally installing a safety valve, an exhaust valve, a drain valve or an energy accumulator, shortening or thickening a pipeline, slowly opening and closing a valve and the like in equipment or a pipeline to reduce the phenomenon and the harm of water hammer; however, implementation of the above measures is limited by a number of objective factors and can significantly increase the manufacturing cost of the device or the pipeline. Therefore, technical measures are adopted in the check valve, and the method is the most direct and effective method for reducing cost and harm.

Disclosure of Invention

An object of the utility model is to provide a simple structure, economical and practical can alleviate the over-and-under type single current valve of water hammer harm.

The utility model discloses a valve body, disk seat, valve gap, bush, case, compression spring and used sealing member, connector, its special character is: a small check valve sealed by a small steel ball is arranged in the sealing end of the lifting check valve core.

The small check valve sealed by the small steel ball is formed by taking the sealing end of the valve core of the lifting check valve as a valve body and adding an outer hexagonal hollow plug and the small steel ball.

An inner hexagonal hollow plug and a filter screen are also arranged at the inlet of the small check valve.

Because the utility model is provided with a small check valve sealed by a small steel ball in the sealing end of the lifting check valve core; when the lifting type check valve is closed due to sudden change of fluid pressure, under the action of inertia, energy of liquid flowing in an original pipeline is concentrated to the lifting type check valve, a water hammer phenomenon is generated, the fluid pressure is several times of the fluid pressure of normal working pressure, if the valve core of the lifting type check valve cannot be pushed open for pressure relief, a small steel ball in the valve core can be pushed open, pressure relief is achieved through the small check valve, the water hammer phenomenon and damage are reduced, and the check valve and equipment or a pipeline where the check valve is located are prevented from being damaged. When the water hammer phenomenon disappears, the lifting type check valve still keeps the original working state.

If the liquid in the equipment or pipeline contains impurities which are not uniform or have larger particles, a filter screen is additionally arranged at the inlet of the small check valve to prevent the small check valve from being blocked.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

fig. 2 is an enlarged schematic view of a small check valve at a in fig. 1 according to the present invention;

fig. 3 is the parts of the small single flow valve of the present invention: the inner end of the outer hexagonal hollow plug is projected in an axial direction to be enlarged.

The part names indicated by reference numerals in the drawings are as follows:

1. the valve comprises a valve body, 2, a valve seat, 3, a stud, 4, a nut, 5, a sealing gasket ring, 6, a valve cover, 7, a lining, 8, a valve core, 9, a compression spring, 10, an outer hexagonal hollow plug, 11, an O-shaped sealing ring, 12, a small steel ball, 13, an inner hexagonal hollow plug, 14 and a filter screen.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

the utility model consists of a common high pressure resistant lifting type check valve in oil and natural gas drilling and production equipment and a small check valve which is added in the sealing end of a valve core 8 of the lifting type check valve and is sealed by a small steel ball 12; normally, an inner hexagonal hollow plug 13 and a filter screen 14 are also arranged at the inlet of the small check valve.

The utility model discloses an over-and-under type single current valve, including special parts: valve body 1, disk seat 2, valve gap 6, bush 7, case 8 and compression spring 9, the sealing member: gasket ring 5 and O-ring 11, coupling: a stud 3 and a nut 4. The valve body 1 is a three-way part, the middle part is a cylinder, and the left end and the right end extend out to form a flange with a neck which is connected with the outside; the middle column body is internally provided with a blind hole valve cavity consisting of an upper cylindrical hole, a transitional taper hole and a lower cylindrical hole from top to bottom in sequence, and the upper end surface of the middle column body is provided with a trapezoidal gasket ring groove and uniformly distributed threaded blind holes which are connected with a valve cover 6; the center of the flange with neck at the left end and the right end is respectively provided with a left flow passage hole and a right flow passage hole which are communicated with a lower cylindrical hole and an upper cylindrical hole of the valve cavity, and the two end surfaces of the flange are respectively provided with a trapezoidal gasket ring groove and uniformly distributed bolt holes for external connection. The utility model discloses a disk seat 2 adopts anticorrosive wear-resisting carbide material, welds on the taper hole of transition in 1 valve pocket of valve body, and the wall thickness after the processing should be greater than 2mm to guarantee its life and effect. The valve cover 6 is the same as the valve cover part of the existing lifting type check valve and is a blind flange-shaped part; the edges of the upper and lower surfaces are uniformly distributed and run through cylindrical holes so as to connect the valve body 1 by a stud bolt 3 and a nut 4; the middle of the lower surface of the circular truncated cone is provided with a convex circular truncated cone, the center of the circular truncated cone is provided with a stepped blind hole for connecting the bushing 7, the valve core 8 and the compression spring 9, and the conical surface of the circular truncated cone is provided with an exhaust hole communicated with the upper end of the stepped blind hole; the periphery of the circular truncated cone is provided with a trapezoidal gasket ring groove, and a sealing gasket ring 5 shared with the valve body 1 is arranged in the groove. The upper end of the valve core 8 is a smooth cylinder and is inserted into the inner ring of the compression spring 9 and a blind hole below the valve cover 6 for guiding; the lower extreme of case 8 is two positive and negative round platform combinations of taking one-level step, the utility model discloses call it to be said: sealing the end; the step is used for preventing the compression spring 9 from deviating, the forward round table is used for facilitating machining and mounting of the small check valve, and the reverse round table is used for sealing with a taper hole of the valve seat 2; a dovetail groove is further processed on the conical surface of the reverse circular truncated cone, and an O-shaped sealing ring 11 is arranged in the dovetail groove to enhance the sealing effect of the valve core 8 and the valve seat 2.

The utility model discloses a little single current valve to the sealed end of over-and-under type single current valve case 8 is the valve body, adds outer hexagonal hollow end cap 10 and little steel ball 12 combination and forms. The outer hexagonal hollow plug 10 is provided with a flat hexagon and a tool withdrawal groove at the outer end, a longer screw column body at the inner end and a through cylindrical hole at the center; symmetrical drainage grooves are cut on the inner end surface of the outer hexagonal hollow plug 10. The inlet of the small check valve is positioned at the central part of the lower end surface of the valve core 8, the outlet is positioned on the conical surface of the forward circular table of the valve core 8, and the inlet hole and the outlet hole are intersected and communicated. The inlet hole is a threaded hole, a tool withdrawal groove, a chamfer and an intersection hole from outside to inside in sequence; the filter screen 14 is arranged in the tool withdrawal groove and is fixed by an inner hexagonal hollow plug 13; the size of the pores of the filter screen 14 can be determined according to the medium condition in the valve and the pore size of the small check valve; under the conditions of pure medium and large aperture of the small check valve, the inner hexagonal hollow plug 13, the filter screen 14 and the mounting hole thereof can be omitted so as to reduce the cost. The outlet hole is a spot-facing hole, a threaded hole, a cylindrical hole, a taper hole and an intersection hole in sequence from outside to inside and from large to small in diameter; the small steel ball 12 is arranged at the cylindrical hole and the conical hole for draining or sealing; the outer hexagonal hollow plug 10 is arranged at the spot facing hole and the threaded hole to prevent the small steel ball 12 from sliding out.

The general structure shown in fig. 1 is a preferred embodiment of the present invention, but is not limited thereto. The axial included angle alpha of the inlet hole and the outlet hole of the small check valve is set between 45 degrees and 90 degrees, and the shape of the forward circular truncated cone at the sealing end of the valve core 8 does not have obvious influence on the performance of the lifting check valve and the small check valve along with the change of the included angle alpha; in addition, any other changes to the structure and shape of the components of the lift type single flow valve without departing from the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a can alleviate over-and-under type single current valve of water hammer harm, includes valve body, disk seat, valve gap, bush, case, compression spring and used sealing member, connector, characterized by: a small check valve sealed by a small steel ball is arranged in the sealing end of the lifting check valve core.

2. The liftable check valve capable of mitigating water hammer hazards, according to claim 1, wherein: the small check valve is formed by taking the sealing end of the valve core of the lifting check valve as a valve body and adding an outer hexagonal hollow plug and a small steel ball.

3. The liftable check valve capable of mitigating water hammer hazards as set forth in claim 2, wherein: the outer end of the outer hexagonal hollow plug is provided with a flat hexagon and a tool withdrawal groove, the inner end of the outer hexagonal hollow plug is provided with a longer screw cylinder, and the center of the inner hexagonal hollow plug is provided with a through cylindrical hole; symmetrical drainage grooves are cut on the inner end surface of the outer hexagonal hollow plug.

4. The liftable check valve capable of mitigating water hammer hazards, according to claim 1, wherein: an inner hexagonal hollow plug and a filter screen are also arranged at the inlet of the small check valve.

5. The liftable check valve capable of mitigating water hammer hazards, according to claim 1, wherein: the axial included angle alpha of the inlet hole and the outlet hole of the small check valve is set between 45 degrees and 90 degrees.

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