CN115507195A - Cage sleeve type fast-adjusting manual throttle valve for gas production well head - Google Patents

Abstract

A cage-type quick-adjust manual throttle valve for gas production wellhead, characterized by: a hard alloy valve seat fixed in the valve cavity hole of the valve body and a hard alloy valve core inserted in the center hole of the valve seat , two rectangular doors with the same included angle are symmetrically opened on the side walls of the two; the lower end of the valve stem is connected with the square hole at the upper end of the valve core with a square prism, and the upper end of the valve stem passes through the valve cover part. The quadrangular prism is connected with the square hole at the lower end of the driving shaft in the driving part; a plurality of blind holes that can be respectively locked by an elastic positioning pin are drilled on the circumference of the driving shaft waistcoat, and a handle is installed on the upper end of the driving shaft; The valve core is driven to rotate by the handle, so that the relative positions of the valve core and the two doors with the same included angle on the valve seat are changed, and the flow rate of the valve is adjusted. Therefore, it has the characteristics of small flow resistance, low working noise, small operation resistance, small product volume, low cost and price, and can adjust the flow rate at a certain speed.

Description

A cage-type quick-adjust manual throttle valve for gas production wellhead

technical field

The invention relates to a "cage type throttle valve" used in petroleum machinery and other industries.

Background technique

Cage throttle valve is a valve used to adjust pipeline flow and pressure in oil, natural gas drilling equipment or other industrial equipment. The existing cage-type manual throttle valves are mostly used in gas production wellhead devices, and most of them use the handwheel to drive the valve stem, which drives a pair of hard alloy valve cores and valve seats connected inside and outside. Relative to another piece, it moves up and down, and the valve is used to adjust the flow rate according to the amount blocked by its dense holes. The valve seat or valve core in the form of up and down movement can have a larger axial stroke, and more holes of different sizes can be distributed on the periphery of the valve seat or valve core, which can ensure a large flow rate, and its flow control Higher precision. But there are also some obvious disadvantages: one is that the distance between the holes and the holes densely distributed on the valve core or seat actually reduces the flow area and increases the flow resistance; When the hole adjusts the flow, it not only wears quickly, but also easily produces clogging or whistle-like noise; the third is to use a larger axial stroke to adjust the flow, which increases the height of the valve body, valve stem, valve cover, and bracket, which also increases The volume, weight and sales price of the product are reduced; the fourth is to use a large axial stroke to adjust the flow rate, and there are still "many handwheel rotations and slow flow adjustment speed. Under ultra-high pressure conditions, the operation resistance is large and time-consuming and laborious” and other issues.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems, adopt a new technical solution, and develop a product that can adapt to ultra-high pressure working conditions, and has small flow resistance, low working noise, small operating resistance, small product volume, and low cost price. And it is a new product of cage-type manual throttle valve that can quickly adjust the flow rate.

The invention is composed of valve body parts, valve cover parts, driving parts, valve stem, valve seat and valve core parts, as well as matching seals and connectors; The hard alloy valve seat inside and the hard alloy valve core inserted in the center hole of the valve seat are symmetrically opened with two rectangular doors with the same included angle on the side walls of both; It is connected with the square hole at the upper end of the spool, the upper end of the valve stem passes through the bonnet part, and connects with the square hole at the lower end of the driving shaft in the driving part with a square prism; there are many holes drilled on the circumference of the driving shaft waistcoat that can The blind holes are respectively locked by an elastic positioning pin, and a handle is installed on the upper end of the drive shaft; the valve core is driven to rotate through the handle, so that the relative position of the valve core and the two doors with the same included angle on the valve seat changes, and the valve flow regulation.

Because the present invention uses two symmetrical gates instead of many holes of different sizes to adjust the flow rate on the valve core and the valve seat, the wall thickness between the holes is completely removed, thereby ensuring the flow area, which is a cage-type section. The flow valve uses the angle method to adjust the flow to create conditions, and make the liquid flow more smooth, the flow resistance is smaller, and the working noise is lower. Use the rolling friction of the handle and thrust bearing to rotate 90°, replace the multi-turn axial stroke of the sliding friction of the handwheel, valve stem and nut to adjust the flow rate; and use the elastic positioning pin to replace the multi-turn locking screw for flow positioning, with The advantages of small operating resistance and fast adjustment speed. Since the adjustment of the flow rate with the up and down stroke is eliminated, the height of the valve stem, valve body, bonnet parts, driving parts and flow display parts is reduced, thereby reducing the number of parts, reducing the volume of the product, and reducing the weight of the product. Weight, reducing the cost and price of the product.

Description of drawings

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

Fig. 2 is a schematic cross-sectional view of fully open throttle valve A-A at the junction of the valve body, valve core and valve seat in Fig. 1;

Fig. 3 is a schematic cross-sectional view of B-B of the locking part of the driving part and the junction with the valve stem in Fig. 1;

FIG. 4 is a schematic top view of the top of the driving part and the flow adjustment mark in C direction in FIG. 1 .

The names of parts indicated by the numbers in the figure are as follows:

1. Valve body, 2. Bonnet, 3. Valve stem, 4. Seal assembly, 5. Bearing shell, 6. Thrust bearing, 7. Drive shaft, 8. Oil cup, 9. Handle, 10. O-ring , 11, flat key, 12, set indicator screw, 13, indicator plate, 14, elastic positioning pin, 15, set screw, 16, stud nut, 17, elastic sealing ring, 18, cylindrical pin, 19, unloading Pressure valve, 20, valve seat, 21, spool, 22, O-shaped sealing ring, 23, wear-resistant bushing, 24, rivet.

detailed description

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

For the convenience of description, the present invention divides many parts into valve body parts, bonnet parts, driving parts, valve stem, valve seat and valve core parts, as well as supporting seals and couplings, thus assembling into an adjustable Valves for ultra-high pressure fluid flow capabilities.

In FIGS. 1 and 2 , the valve body components are composed of a valve body 1 , a pressure relief valve 19 and an anti-wear bushing 23 . The valve body 1 is a "three-way" part. Step holes with different diameters are processed from top to bottom in the center of the main body of the square column. hole and the channel hole below; the upper end surface of the main body is processed with a plurality of threaded blind holes evenly distributed around the channel hole, which are used to connect the valve cover 2; a neck flange protrudes from one side and the lower end of the main body, the flange The center of the center is the passage hole that meets the valve cavity hole, and the end face of the flange is processed with a trapezoidal gasket ring groove around the passage hole and a number of bolt holes evenly distributed for external connection; the neck flange at the lower end A wear-resistant bushing 23 is installed in the passage hole to improve the wear resistance of the valve body 1; a pressure relief valve 19 is installed on the side wall of the valve body 1 relative to the axial position of the passage hole of the neck flange on the side, so that Remove the pressure in the valve cavity during maintenance.

The bonnet part is composed of a bonnet 2 , a sealing assembly 4 and an elastic sealing ring 17 . The upper part of the valve cover 2 is sequentially processed into a stud body, an undercut and a cylinder, which are used to connect the bearing housing 5 in the driving part; It is connected with the valve body 1; the lower section is a hollow cylinder with the same diameter, and its outer surface is processed with two grooves for installing elastic sealing rings 17; The stepped hole with internal thread is used to install the valve stem 3 and the sealing assembly 4; the stepped hole on the lower end surface is specially used to accommodate the valve stem 3; on the lower end surface of the bonnet 2, there are also two small blind holes drilled symmetrically , connect with two small blind holes on the upper end surface of the valve seat 20 with a cylindrical pin 18 to prevent the valve seat 20 from rotating. The sealing assembly 4 is composed of a joint cap, two flat washers and two bud-shaped sealing rings, and is used to seal the valve stem 3 to prevent ultra-high pressure fluid from leaking. The elastic sealing ring 17 has parallel straight-line sides up and down in its section, an arc-shaped groove on the inside, and an arc-shaped protrusion on the outside; its main material is "FKM fluorine rubber" or "HNBR high saturated hydrogenated nitrile butadiene "Rubber", at the two shoulders of the protruding end, each is inlaid with a spring ring made of stainless steel wire, which can effectively prevent the ultra-high pressure fluid from leaking from the junction of the valve body 1 and the valve cover 2.

The driving part consists of bearing shell 5, thrust bearing 6, drive shaft 7, oil cup 8, handle 9, O-ring 10, flat key 11, set indicator screw 12, indicator plate 13, elastic positioning pin 14, set screw 15 and rivets 24 are formed. At the center of the lower end surface of the drive shaft 7, a square blind hole is processed to connect with the quadrangular prism at the upper end of the valve stem 3; the lower part of the drive shaft 7 is equipped with a thrust force on the upper and lower sides of the raised waistcoat. After the bearing 6 is wrapped with the O-ring 10 in the middle and the bearing shell 5, the threaded hole on the bottom surface of the bearing shell 5 and the stud at the upper end of the valve cover 2 are connected together, and fixed with set screws 15. On the circumference of the shoulder of the drive shaft 7, according to the angle between the two rectangular doors on the valve seat 20 and the valve core 21, several blind holes are drilled symmetrically within 180°; Elastic locating pin 14 can be respectively inserted in the blind hole of driving shaft 7 waistcoat, is used for fixing the relative position of two rectangular doors on valve seat 20 and spool 21, carries out flow regulation, and guarantees that the flow of setting is constant. The oil cup 8 installed above the side wall of the bearing housing 5 is used to add lubricating oil to the thrust bearing 6 to reduce frictional resistance. Handle 9 is connected with the cylinder and flat key 11 of the upper end of drive shaft 7 with the hole and keyway of tailstock center, and is fixed with tightening index screw 12 axially. Both ends of the tightening indicator screw 12 are processed into conical shapes, which are used for tightening and indicating respectively; most of the main body of the tightening indicator screw 12 is processed into a screw rod, and a small part is processed into a cylinder with two symmetrical planes for use Wrench screw it into the threaded hole on the handle 9. The upper end surface of the bearing housing 5 is fixed with the indicator plate 13 with rivets 24 or glue; when the handle 9 is turned, the tightening indicator screw 12 on the tailstock cooperates with the indicator plate 13 to indicate that the valve seat 20 and the valve core 21 The degree of the door relative to the switch.

The elastic positioning pin 14 of the present invention is composed of an elastic bolt, a fixed sleeve, a compression spring, a hole nut and a pull ring. The fixed sleeve is a small steel pipe with external threads processed at both ends of a section. One end of the steel pipe is connected with the threaded hole on one side of the bearing shell 5 and fixed by welding, and the other end is connected with the hole nut; in the center hole of the fixed sleeve, a There are elastic pins and compression springs; the thick end of the elastic pin is inward, and the thin end runs through the central hole of the compression spring and the hole nut, and then the thin end is fastened by the pull ring to the radial hole to form a whole. small parts. When the elastic positioning pin 14 is pulled out, the handle 9 can be used to adjust the flow rate; when the elastic positioning pin 14 is locked with a certain blind hole, the driving part, the valve stem 3 and the valve core 21 cannot rotate.

Both the upper end and the lower end of the valve stem 3 are processed into quadrangular prisms, which are used to transmit the torque on the drive shaft 7 to the valve core 21; The sealing assembly 4 in the parts seals it; the lower section of the valve stem 3 is a smooth cylinder with a thicker diameter, and a chamfer transition of 45° is used between two cylinders with different diameters.

The valve seat 20 is a hollow cylindrical part made of hard alloy material; the center is a through hole of the same diameter, which is used to rotate with the valve core 21; 18 is docked with the valve cover 2 for positioning; a sealing groove is processed on the top and bottom of the outer circular surface, and an O-shaped sealing ring 22 is installed inside; two rectangular doors with the same included angle are symmetrically opened on the middle side wall to adjust the flow rate .

The valve core 21 is also a hollow cylindrical part made of hard alloy material. The periphery is a smooth cylinder, which is used to rotate with the center hole of the valve seat 20. The quadrangular prisms at the lower end are connected; a deep cylindrical hole is processed in the center of the lower end surface as a fluid channel; a small diameter cylindrical hole is used to penetrate between the square hole on the upper end surface and the cylindrical hole on the lower end surface. The upper and lower pressures of the valve core 21 are balanced to reduce the operating resistance of the handle 9; two rectangular doors with the same included angle as the valve seat 20 are symmetrically opened on the middle side wall for adjusting the flow rate.

The two rectangular doors with the same included angle on the valve seat 20 and the valve core 21 of the present invention, when the direction of opening the door is installed in the valve cavity hole of the valve body 1, keep the channel hole with the neck flange on the side of the valve body 1 The axes are perpendicular to each other, so that the two doors are evenly stressed and worn uniformly.

Fig. 3 and Fig. 4 are an embodiment of the present invention: two rectangular doors with the same included angle on the valve seat 20 and the valve core 21 of the present invention, its included angle is selected between 80°～90°, to ensure its Larger flow; When setting its included angle as 85 °, in the 180 ° range on the circumference of the drive shaft 7 vests, there are eleven symmetrically distributed blind holes drilled. On the top of the indicator plate 13 fixed on the upper end surface of the bearing shell 5, there are engraved with a word "open", two "close" characters, and two groups of eight symmetrically distributed percentages and scale marks representing flow regulation, and the percentages are in turn: 80%, 60%, 40% and 20%; the handle 9 in the driving part can rotate forward or reverse arbitrarily, and both can regulate the flow rate or close the valve.

Claims (5)

1. A cage-type quick-adjust manual throttle valve for gas production wellhead, which is composed of valve body parts, valve cover parts, driving parts, valve stem, valve seat and valve core parts, as well as matching seals and couplings It is characterized in that: the hard alloy valve seat fixed in the valve cavity hole of the valve body and the hard alloy valve core inserted in the center hole of the valve seat have two symmetrical openings on the side walls of the two. A rectangular door with the same included angle; the lower end of the valve stem connects with the square hole at the upper end of the valve core with a square prism; Cohesion; on the circumference of the drive shaft waistcoat, there are several blind holes that can be locked separately by an elastic positioning pin, and a handle is installed on the upper end of the drive shaft; the valve core is driven to rotate through the handle, so that the valve core and the valve seat The relative position of the two gates with the same included angle changes to adjust the flow of the valve. 2. The cage-type quick-adjust manual throttle valve for gas production wellhead according to claim 1 is characterized in that: the driving part consists of a bearing shell, a thrust bearing, a drive shaft, an oil cup, a handle, an O-ring, It is composed of flat key, tightening indicator screw, indicator plate, elastic positioning pin, set screw and rivet; the upper end surface of the bearing shell is fixed with rivet or glue to indicate the indicator plate; when the handle is turned, the tightening on the tailstock The indicator screw cooperates with the indicator plate to indicate the relative opening and closing degree of the valve seat and valve core. 3. The cage-type quick-adjust manual throttle valve for gas production wellhead according to claim 1, characterized in that: the elastic positioning pin is composed of an elastic bolt, a fixed sleeve, a compression spring, a hole nut and a pull ring It is combined; the fixed sleeve is a small steel pipe with external threads processed at both ends of a section, one end of the steel pipe is connected with the threaded hole on one side of the bearing shell and fixed by welding, and the other end is connected with the hole nut; in the center hole of the fixed sleeve Inside, there are elastic pins and compression springs; the thick end of the elastic pin is inward, and the thin end runs through the central hole of the compression spring and the hole nut, and then the thin end is fastened with a pull ring to form a small radial hole. A whole widget. 4. The cage-type quick-adjust manual throttle valve for gas production wellhead according to claim 1, characterized in that: two rectangular doors with the same angle between the valve seat and the valve core, the opening direction of which is in the direction of the valve When installing in the valve cavity hole of the valve body, keep the axis of the channel hole of the neck flange on the side of the valve body perpendicular to each other. 5. The cage-type quick-adjust manual throttle valve for gas production wellhead according to claim 1, characterized in that: two rectangular doors with the same included angle on the valve seat and the valve core, the included angle is 80° to 90°; when the included angle is set to 85°, there are eleven symmetrically distributed blind holes drilled within 180° of the circumference of the drive shaft vest; On the top of the indicator plate, there are one word "open", two "off" characters, and two groups of eight symmetrically distributed percentages and scale marks representing flow adjustment, and the percentages are 80%, 60%, 40% and 20%; the handle in the driving part can be rotated forward or reverse arbitrarily, and the flow can be adjusted or the valve can be closed.

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