CN221811011U - A hard seal high pressure butterfly valve - Google Patents

Abstract

The utility model discloses a hard-sealed high-pressure butterfly valve, which has a valve body, butterfly plates are mounted on the upper and lower valve shafts in the valve body, a friction pad is mounted on the bottom of the lower valve shaft, the butterfly plate has a butterfly plate metal sealing ring, the valve body is provided with a valve body metal sealing ring, a valve body sealing seat is also provided with a positioning pressing ring, a disc-shaped friction pad is provided with a friction pad stud and a friction pad screw hole, a center screw hole and a valve shaft screw hole are provided at the bottom end of the lower valve shaft, the friction pad stud is screwed into the center screw hole of the valve shaft, and positioning screws are screwed into the friction pad screw hole and the valve shaft screw hole; the valve body sealing seat is provided with an inner step, the valve body metal sealing ring is provided with an outer step, and the valve body sealing seat between the valve body metal sealing ring and the positioning pressing ring is provided with an adjustment washer along the circumference, the adjustment washer and the positioning pressing ring are positioned and connected by screws, the adjustment washer is evenly provided with cylindrical holes along the circumference, and a compression spring is installed in the cylindrical hole. The utility model is convenient for maintenance when the butterfly plate sinks, and has good reverse sealing performance.

Description

A hard seal high pressure butterfly valve

Technical Field

The utility model relates to the technical field of valve manufacturing, in particular to a hard-sealed high-pressure butterfly valve.

Background Art

Hard-seal high-pressure butterfly valves can be widely used to control the flow of various types of fluids such as air, water, steam, mud, etc. The opening and closing part is a disc-shaped butterfly plate, which rotates around its own valve axis in the valve body to achieve the purpose of opening and closing or regulation. It mainly plays a role of cutting off and throttling in the pipeline.

The hard-sealed high-pressure butterfly valve in the prior art mainly comprises a valve body, wherein the upper and lower ends of the valve body are respectively provided with upper and lower valve shaft seats, and the upper and lower valve shaft seats are provided with upper and lower valve shafts, and the upper and lower parts of the butterfly plate in the valve body are fixed on the upper and lower valve shafts, and a disc-shaped friction pad is provided at the bottom of the lower valve shaft, and a valve seat end cover is packaged at the bottom of the lower valve shaft seat, a butterfly plate metal sealing ring is provided on the outer circumference of the butterfly plate, and a valve body sealing seat is provided on the circumference of the valve body, a valve body metal sealing ring matching with the butterfly plate metal sealing ring is provided on the valve body sealing seat, and a positioning pressure ring is provided on the valve body sealing seat outside the valve body metal sealing ring. The hard-sealed high-pressure butterfly valve in the above-mentioned prior art is found to have the following main problems during use: during forward sealing, the metal sealing ring of the butterfly plate and the metal sealing ring of the valve body cooperate well. When the fluid flows in the reverse direction, the fluid will exert a large impact force on the valve shaft and the butterfly plate, resulting in a slight deformation of the valve shaft and the butterfly plate, and then a gap will appear between the metal sealing ring of the butterfly plate and the metal sealing ring of the valve body, thereby failing to achieve reverse sealing of the above-mentioned valve; after long-term use, the friction pad in the lower valve shaft seat will be worn to a large extent, and a gap will appear between the friction pad and the valve seat end cover, causing the butterfly plate to sink. When the valve needs to be closed, it will not be closed in place and leakage will occur. Since the friction pad of the butterfly valve with the above-mentioned prior art structure is fixed at the bottom of the valve shaft, when the friction pad is worn and causes the butterfly plate to sink, the valve shaft can only be disassembled and the friction pad replaced. This increases the maintenance workload of the butterfly valve on the one hand, and increases the maintenance cost of the butterfly valve on the other hand.

Utility Model Content

The technical problem to be solved by the utility model is to provide a hard-sealed high-pressure butterfly valve which is easy to repair when the butterfly plate sinks due to the wear of the friction pad after long-term use and has good reverse sealing performance.

To solve the above technical problems, the utility model discloses a hard-sealed high-pressure butterfly valve, comprising a valve body, wherein the upper and lower ends of the valve body are respectively provided with upper and lower valve shaft seats, the upper and lower valve shaft seats are provided with upper and lower valve shafts, the upper and lower parts of the butterfly plate in the valve body are fixed on the upper and lower valve shafts, the bottom of the lower valve shaft is provided with a disc-shaped friction pad, the bottom of the lower valve shaft is packaged with a valve seat end cover, the outer circumference of the butterfly plate is provided with a butterfly plate metal sealing ring, the circumference of the valve body is provided with a valve body sealing seat, the valve body sealing seat is provided with a valve body metal sealing ring matching with the butterfly plate metal sealing ring, a positioning pressure ring is provided on the valve body sealing seat outside the valve body metal sealing ring, a friction pad stud is fixed at the center position of the disc-shaped friction pad, the disc-shaped friction pad is evenly distributed with friction pad screw holes along the circumferential direction, and the center position of the bottom end of the lower valve shaft is provided with a valve shaft center stud matching with the friction pad stud. The center screw hole is provided with a valve shaft screw hole matching with the friction pad screw hole along the circumferential direction at the bottom end of the lower valve shaft, and the friction pad stud is screwed into the center screw hole of the valve shaft, and positioning screws are screwed in the friction pad screw hole and the valve shaft screw hole; an inner step is provided on the inner circumference of the valve body sealing seat, and an outer step matching with the inner step is provided on the outer circumference of the valve body metal sealing ring, and an adjusting gasket is provided along the circumference of the valve body sealing seat between the valve body metal sealing ring and the positioning pressure ring, and the adjusting gasket is positioned and connected with the positioning pressure ring by screws, and the adjusting gasket is evenly distributed with cylindrical holes along the circumference, and a compression spring is installed in the cylindrical hole. When the valve body metal sealing ring compresses the compression spring and is close to the adjusting gasket, an annular gap with a rectangular cross-section is formed between the inner step on the valve body sealing seat and the outer step on the valve body metal sealing ring.

The hard-sealed high-pressure butterfly valve of the above structure has convenient maintenance when the friction pad is worn out due to long-term use, causing the valve plate to sink. When repairing, it is only necessary to remove the valve seat end cover, remove the positioning screw, and then rotate the friction pad. After reaching the required adjustment amount, the friction pad and the valve shaft are fixed with the positioning screw, and then the valve seat end cover is installed. The utility model is convenient for maintenance when the friction pad is worn out and causes the valve plate to sink. There is no need to replace the friction pad and the maintenance cost is low. In addition, when the reverse flow of the fluid impacts the upper and lower valve shafts and the butterfly plate, causing the upper and lower valve shafts and the butterfly plate to have slight deformation, the compression spring in the adjusting gasket will push the valve body metal sealing ring to move forward along the annular gap formed between the inner step on the valve body sealing seat and the outer step on the valve body metal sealing ring to compensate for the gap between the butterfly plate metal sealing ring and the valve body metal sealing ring formed by the deformation of the valve shaft and the butterfly plate, thereby achieving effective reverse sealing.

As an improvement of the utility model, a spring fixing cylinder is fixedly installed in the cylindrical holes of the adjusting washer which are evenly distributed along the circumference and radial direction, and the compression spring is sleeved on the spring fixing cylinder.

After the spring fixing cylinder is fixed in the cylindrical hole, the radial positioning of the compression spring can be further performed, so that the compression spring can exert a better elastic thrust on the metal sealing ring of the valve body.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model is further described in detail below in conjunction with the accompanying drawings.

FIG1 is a schematic diagram of the main cross-sectional structure of a hard-sealed high-pressure butterfly valve of the present invention.

FIG. 2 is an enlarged schematic diagram of the structure at location I in FIG. 1 .

FIG3 is a schematic diagram of the main cross-sectional structure of the friction pad in the present invention.

FIG. 4 is a schematic top view of FIG. 3 .

FIG. 5 is a schematic structural diagram of the lower valve shaft of the utility model.

FIG. 6 is a schematic structural diagram along the C direction of FIG. 5 .

FIG. 7 is an enlarged schematic diagram of the structure at position II in FIG. 1 , which shows the state in which the adjusting washer and the positioning pressure ring are positioned and connected by screws.

FIG8 is an enlarged schematic diagram of the structure at II in FIG1 , which shows the internal structure of the adjustment washer equipped with a compression spring.

FIG. 9 is an enlarged schematic diagram of the structure at point III in FIG. 8 .

DETAILED DESCRIPTION

Referring to Fig. 1 to Fig. 9, the utility model is a hard-sealed high-pressure butterfly valve, comprising a valve body 10, wherein the upper and lower ends of the valve body are respectively provided with upper and lower valve shaft seats 11 and 12, wherein the upper and lower valve shaft seats are provided with upper and lower valve shafts 13 and 14, wherein the upper and lower parts of a butterfly plate 20 in the valve body are fixed on the upper and lower valve shafts, and a disc-shaped friction pad 15 is provided at the bottom of the lower valve shaft, and a valve seat end cover 16 is packaged at the bottom of the lower valve shaft seat, wherein a butterfly plate metal sealing ring 21 is provided on the outer circumference of the butterfly plate, a valve body sealing seat 22 is provided on the circumference of the valve body, a valve body metal sealing ring 23 matching with the butterfly plate metal sealing ring is provided on the valve body sealing seat, and a positioning pressing ring 24 is provided on the valve body sealing seat outside the valve body metal sealing ring, wherein the friction pad stud 151 is fixed at the center position of the disc-shaped friction pad, the disc-shaped friction pad is evenly provided with friction pad screw holes 152 along the circumferential direction, and a valve stud matching with the friction pad stud is provided at the center position of the bottom end of the lower valve shaft The center screw hole 141 of the shaft, the bottom end of the lower valve shaft is provided with a valve shaft screw hole 142 which matches the friction pad screw hole along the circumferential direction, the friction pad stud is screwed into the center screw hole of the valve shaft, and positioning screws 143 are screwed into the friction pad screw hole and the valve shaft screw hole; an inner step 221 is provided on the inner circumference of the valve body sealing seat 22, and an outer step 231 which matches the inner step is provided on the outer circumference of the valve body metal sealing ring 23, and an adjusting washer 25 is provided on the circumference of the valve body sealing seat between the valve body metal sealing ring and the positioning pressure ring, and the adjusting washer is positioned and connected to the positioning pressure ring by screws 26, and the adjusting washer is evenly distributed with cylindrical holes 251 along the circumference, and a compression spring 252 is installed in the cylindrical hole, and when the valve body metal sealing ring compresses the compression spring and is close to the adjusting washer, an annular gap 232 with a rectangular cross-section is formed between the inner step on the valve body sealing seat and the outer step on the valve body metal sealing ring. A spring fixing cylinder 253 is fixedly installed in the cylindrical holes 251 uniformly distributed along the circumference and radial direction of the adjusting washer, and the compression spring 252 is sleeved on the spring fixing cylinder.

It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Any modification or equivalent replacement of the utility model to achieve the same technical effect is within the protection scope of the utility model.

Claims (2)

1. The utility model provides a hard seal high pressure butterfly valve, has valve body (10), and upper and lower both ends of valve body have upper and lower valve axle seat (11, 12) respectively, have upper and lower valve axle (13, 14) in the upper and lower valve axle seat, and upper and lower portion of butterfly plate (20) is fixed on upper and lower valve axle in the valve body, and disc friction pad (15) are equipped with to the bottom of lower valve axle seat, and valve seat end cover (16) are packed to the bottom of lower valve axle seat, have butterfly plate metal seal (21) on the outer circumference of butterfly plate, have valve body seal seat (22) on the valve body inner circumference, be equipped with on the valve body seal seat with butterfly plate metal seal matched with valve body metal seal (23), be equipped with location clamping ring (24) on the valve body seal seat in the valve body metal seal outside, its characterized in that: the center of the disc-shaped friction pad is fixedly provided with a friction pad stud (151), friction pad screw holes (152) are uniformly distributed in the disc-shaped friction pad along the circumferential direction, a valve shaft center screw hole (141) matched with the friction pad stud is formed in the center of the bottom end of the lower valve shaft, a valve shaft screw hole (142) matched with the friction pad screw hole is formed in the bottom end of the lower valve shaft along the circumferential direction, the friction pad stud is screwed into the valve shaft center screw hole, and positioning screws (143) are screwed into the friction pad screw hole and the valve shaft screw hole; an inner step (221) is arranged on the inner circumference of the valve body sealing seat (22), an outer step (231) matched with the inner step is arranged on the outer circumference of the valve body metal sealing ring (23), an adjusting washer (25) is arranged on the circumference of the valve body sealing seat between the valve body metal sealing ring and the positioning pressing ring, the adjusting washer is in positioning connection with the positioning pressing ring through a screw (26), cylindrical holes (251) are uniformly distributed in the circumferential radial direction, compression springs (252) are arranged in the cylindrical holes, and when the compression springs are tightly attached to the adjusting washer by compression of the valve body metal sealing ring, an annular gap (232) with a rectangular section is formed between the inner step on the valve body sealing seat and the outer step on the valve body metal sealing ring.

2. The hard seal high pressure butterfly valve of claim 1, wherein: the adjusting washers are fixedly provided with spring fixing cylinders (253) in cylindrical holes (251) which are uniformly distributed along the circumferential direction, and the compression springs (252) are sleeved on the spring fixing cylinders.