CN204961898U - High pressure metal seal formula plug valve - Google Patents

Abstract

The utility model provides a high pressure metal seal formula plug valve, include the valve body with and the cock of inner chamber installation, cock valve body inner chamber symmetry all around sets up two sealed arc pieces and two side arc pieces, and the cock form through sealed arc piece, side arc piece and valve body inner chamber all around sealed vice, sealed cooperation that the interior cambered surface of sealed arc piece and the outer peripheral face of cock formed be the metal and the metal sealed firmly, sealed arc piece along the fluid passage flow direction arrange and sealed arc piece on all opened the centre bore, the perpendicular fluid passage of the side arc piece flow direction is arranged. The utility model discloses a technique advantage lies in: the soft seal structure commonly used with present plug valve combines together with hard seal structure, compares with the soft seal plug valve, and the seal structure between valve body and the cock sets up to the metal is sealed firmly, and be applicable in high pressure resistant operating mode, compare with plug valve sealed firmly, valve body and cock be direct contact no longer, sets up to seal the arc piece as linking, the valve body that no longer directly weares and teares, the greatly life of the valve body of degree improvement when the cock is rotated.

Description

High Pressure Metal Sealed Plug Valve

technical field

The utility model belongs to the technical field of fluid switching valves, in particular to a cock valve for oil field fracturing operations.

Background technique

Plug valve is an early application valve, widely used in chemical industry, medical treatment, engineering, oil and gas exploration and other industries for fluid transportation pipelines and equipment. The opening and closing part of the plug valve is cylindrical or conical, and it can be opened or closed by rotating 90° so that the flow hole on the plug communicates with or intersects the diameter hole on the valve body vertically. The plug valve is suitable for cutting off or connecting the fluid medium. At the same time, because the movement between the sealing surfaces of the plug valve has a wiping effect, it can completely prevent contact with the flowing medium when fully open, so it is usually also suitable for the medium with suspended particles. It has excellent anti-blocking and good flow performance. Common plug valves on the market today include soft-sealed plug valves, oil-lubricated hard-sealed plug valves and conical plug valves. Soft-sealed plug valves are suitable for medium and low pressure environments. Oil-lubricated hard-sealed plug valves usually form a hard seal directly between the plug and the valve body, and a sealing oil film is formed between the two with lubricating oil. This type of valve is suitable for medium and high pressure environments, but once the sealing surface of the valve body is damaged, it cannot be repaired and used, and its service life is short. At present, during oil field fracturing operations, the fracturing fluid pumped out by the fracturing crew is collected in one place through the fracturing manifold, forming high pressure and entering the wellhead. Therefore, a cock valve that can be opened and closed quickly, withstand high pressure and be durable is needed on the fracturing manifold.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned plug valves, and provide a metal-sealed high-pressure plug valve with high pressure resistance, superior sealing performance, reliable switching and long service life for fracturing operations in oil and gas exploitation. Fracking operations are performed safely and reliably.

The technical scheme of the utility model is: comprising a valve body and a cock installed in its inner cavity, the inner cavity of the valve is provided with a fluid passage, the cock is provided with a flow channel hole, and two valve inner chambers are symmetrically arranged around the cock. One sealing arc and two side arcs, and the sealing arc, the side arc and the inner cavity of the valve form a sealing pair around the cock, and the inner arc of the sealing arc and the outer peripheral surface of the cock form a metal-to-metal hard seal The sealing arcs are arranged along the flow direction of the fluid channel, and the sealing arcs are provided with a central hole, and the side arcs are arranged vertically to the flow direction of the fluid channel; the bottom of the valve body is connected to the bonnet by bolts, and the valve body and the bonnet The "O" type sealing ring is used to seal between them, the lower end of the cock is installed on the valve cover, and the upper end is installed through the valve body to install the hand wheel.

Preferably, the sealing arc and the two side arcs are installed in the valve body through positioning pins to prevent the sealing arc and the side arcs from deviating from their positions.

Preferably, the upper and lower parts of the cock are respectively supported on the valve body and the valve cover through packing to form a seal.

Preferably, the outer arc surface of the sealing arc forms a soft seal with the inner cavity of the valve through an "O" type sealing ring.

Preferably, the movement of the handwheel and the cock is limited by the cooperation of the brake groove and the brake pin between the handwheel and the valve body. For example, it can be designed as follows: a 90° brake groove is set on the handwheel, so The brake pin mentioned above is installed on the valve body and inserted into the brake groove to limit the position.

Preferably, the bottom of the cock is provided with a grease injection valve for filling the sealing grease between the sealing pairs, through which the sealing grease can be injected between the sealing pairs (cock and arc), and the gap can be compensated to enhance the overall sealing performance , and play a lubricating role to reduce the valve opening and closing torque.

Preferably, the bottom of the valve cover is connected to the supporting ring by bolts.

Preferably, the inlet and outlet at both ends of the valve body are respectively provided with union joints, and the disassembly and assembly of such joints is quick and convenient.

Compared with the prior art, the technical advantage of the utility model lies in: combining the soft sealing structure and the hard sealing structure commonly used in plug valves at present, compared with the soft sealing plug valve, the sealing structure between the valve body and the plug is set as Metal hard seal, suitable for high-pressure working conditions; compared with hard-sealed plug valves, the valve body and the cock are no longer in direct contact, and the sealing arc is set as a connection, so that the cock does not directly wear the valve body when it rotates, which greatly improves service life of the valve body.

Description of drawings

Fig. 1 is a front view sectional view of an embodiment of the utility model;

Fig. 2 is a side view sectional view of an embodiment of the utility model;

In the figure: hand wheel 1, valve body 2, first "O" type sealing ring 3, sealing arc 4, first union joint 5, packing 6, grease injection valve 7, support ring 8, bolt 9, valve Cover 10, second "O" type sealing ring 11, second union joint 12, cock 13, brake pin 14, positioning pin 15, side arc piece 16, connecting bolt 17.

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

See Figure 1-2, a high-pressure metal-sealed plug valve. The plug valve includes a valve body 2, a plug 13, a sealing arc 4, a side arc 16, a valve cover 10, a support ring 8, a hand wheel 1, and a grease injection valve. 7 and connecting bolt 17 etc. The cock of the switch part of the cock valve adopts a cylindrical design, and there is a circular flow hole in the direction perpendicular to the generatrix of the cock cylinder. The cock 13 is installed in the valve body 2, and two sealing arcs 4 and two side arcs are symmetrically arranged around it. 16. The two sealing arcs 4 are installed symmetrically at the inlet and outlet of the inner cavity channel of the valve respectively. The ring 3 forms an effective seal with the valve body 2, and the inner side forms a hard seal with the cylindrical surface of the cock 13; the cock 13 is supported up and down by the packing 6 to form an upper and lower seal. The bonnet 10 is fastened to the bottom of the valve body 2 through connecting bolts 17, and is sealed by the second "O" type sealing ring 11, and the support ring 8 is fastened on the bonnet 10 through bolts 9; 7 is installed at the bottom of the cock 13; the cock 13 is connected to the handwheel 1, and the handwheel is provided with a 90° brake groove, and the brake pin 14 is installed on the valve body 2 and inserted into the brake groove to limit the position; the two ends of the valve body 2 are inserted The export system has a union joint, which is quick and convenient to disassemble and assemble.

When the cock rotates counterclockwise during operation, the valve will open when the flow channel hole of the cock, the center hole of the arc sheet and the flow direction of the valve body coincide; otherwise, the cock rotates clockwise, and the flow channel hole of the cock is perpendicular to the center hole of the arc sheet and the flow direction of the valve body , the valve is closed. In addition, the hand wheel is designed with a 90° brake groove, which matches with the brake pin designed on the valve body. When in use, it can be quickly judged whether the valve is opened and closed in place through the state of the hand wheel; both ends of the valve body adopt standard union joints. Quick and easy to install.

Compared with the previous cock valve, the utility model cock valve adopts metal sealing structure and can withstand high pressure; when the cock valve is working, the cock directly rotates with the sealing arc, which will no longer cause wear to the inner cavity of the valve and cannot be repaired. If the structure is worn out, only the sealing arc or the cock needs to be replaced. At the same time, sealing grease is filled between the sealing pairs to compensate the gap to enhance the overall sealing performance, and play a lubricating role to reduce the opening and closing torque of the valve.

For those of ordinary skill in the art, without departing from the principle of the utility model, it is possible to make some improvements and modifications to the specific dimensions or local structures, and these improvements and modifications should also be regarded as the invention of the utility model. protected range.

Claims (9)

1. A high-pressure metal-sealed cock valve, comprising a valve body and a cock installed in its inner cavity, the inner cavity of the valve is provided with a fluid channel, and the cock is provided with a flow channel hole, characterized in that: the cock around the Two sealing arcs and two side arcs are symmetrically arranged in the inner cavity of the valve, and the sealing arcs, side arcs and the inner cavity of the valve form a sealing pair around the cock, the inner arc surface of the sealing arc and the outer peripheral surface of the cock A metal-to-metal hard seal is formed; the sealing arcs are arranged along the flow direction of the fluid channel and have a central hole on the sealing arcs, and the side arcs are arranged perpendicular to the flow direction of the fluid channel; the bottom of the valve body is connected to the bonnet by bolts And the valve body and the valve cover are sealed by an "O" type sealing ring, the lower end of the cock is installed on the valve cover, and the upper end runs through the valve body to install a handwheel. 2. The high-pressure metal-sealed plug valve according to claim 1, wherein the sealing arc and the two side arcs are installed in the valve body through positioning pins. 3. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the upper and lower parts of the plug are respectively supported on the valve body and the valve cover through packing to form a seal. 4. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the outer arc surface of the sealing arc forms a soft seal with the inner cavity of the valve through an "O"-shaped sealing ring. 5. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the handwheel and the valve body are limited by the cooperation of the brake groove and the brake pin to realize the movement of the handwheel and the cock. 6. The high-pressure metal-sealed plug valve according to claim 5, characterized in that: a 90° brake groove is provided on the hand wheel, and the brake pin is installed on the valve body and inserted into the brake groove to limit bit. 7. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the bottom of the plug is provided with a grease injection valve for filling sealing grease between the sealing pairs. 8. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the bottom of the valve cover is connected to the supporting ring by bolts. 9. The high-pressure metal-sealed plug valve according to claim 1, characterized in that: the inlet and outlet at both ends of the valve body are respectively provided with union joints.