CN209856413U

CN209856413U - Quick cut-off safety valve

Info

Publication number: CN209856413U
Application number: CN201920630893.6U
Authority: CN
Inventors: 姜玉虎; 杨培建; 赵钢; 陈生财; 许萍文; 张学青; 张庭高
Original assignee: JIANGSU HONGTAI PETROCHEMICAL MACHINERY CO Ltd
Current assignee: JIANGSU HONGTAI PETROCHEMICAL MACHINERY CO Ltd
Priority date: 2019-04-27
Filing date: 2019-04-27
Publication date: 2019-12-27
Anticipated expiration: 2029-04-27

Abstract

A quick cut-off safety valve is composed of an opening and closing mechanism and a gate valve main body; in the opening and closing mechanism, in a cylinder sleeve, the lower end of an indicating rod is fixed in a threaded hole at the upper end of a piston by a stud head and a set screw, and the upper end of a valve rod is directly hung in a T-shaped groove at the lower end of the piston by a T-shaped joint; the spring is sleeved above the valve rod and at the lower end of the piston, and two ends of the spring are respectively contacted with the piston and the cylinder cover joint; the upper end of the indicating rod and the lower end of the valve rod respectively penetrate through the center holes of the cylinder cover joint and the cylinder cover to extend out, so that a sealing cavity between the piston and the cylinder cover becomes a hydraulic oil cylinder, and a sealing cavity between the piston and the cylinder cover joint becomes a compression cylinder and a spring working chamber. In addition, a radial pressure relief small hole is processed on the cylinder cover joint, a flow direction mark is added on the outer surface of the valve body, and two radial pressure balance holes are symmetrically drilled on the side wall of the inlet valve seat. Through the technical measures, the volume of the safety valve is reduced, the structure is simplified, the cost is reduced, and the performance is optimized.

Description

Quick cut-off safety valve

Technical Field

The utility model relates to a "cut off relief valve fast" that uses in petroleum machinery and other trades.

Background

The hydraulic control and driving quick cut-off safety valve is an important valve for safety in oil drilling and production equipment although the use amount is not large; the hydraulic gate valve consists of a hydraulic drive opening and closing mechanism, a spring reset closing mechanism and a main body part of a large-caliber gate valve, and a pipeline where the hydraulic drive opening and closing mechanism is located is quickly cut off under an emergency condition so as to prevent accidents from happening and expanding. However, the existing safety valve has some defects in use: firstly, most of safety valves are completely reset and closed by springs, and the spring resetting and closing effects of a few valves are poor due to the fact that the self-quality and the specific working conditions of the valves are different; secondly, in order to avoid the influence of adverse factors such as different axial degrees of various parts, the existing hydraulic drive opening and spring reset closing mechanisms are mostly of double-cylinder sleeve structures and can relatively deviate, so that the product structure is complex and large in size, and the production cost and the resource waste are increased; thirdly, the existing safety valve mostly adopts a gate valve main body structure without a balance tail rod, and when a valve rod and a gate plate move in a sealed valve cavity, air compression or vacuum phenomenon is generated due to the change of the volume in the valve cavity, so that the opening and closing resistance of the valve is increased, and the reset effect of a spring is influenced.

Disclosure of Invention

The utility model discloses to above-mentioned problem, adopt multinomial technical measure, carry out the innovative design to the relief valve that cuts off fast to improve the reliability and the price/performance ratio of its switch.

The utility model discloses constitute by starting and stopping mechanism and gate valve main part, its characteristic part is: in the opening and closing mechanism, a cylinder cover joint, a cylinder cover and a sealing element and a connecting element carried by the cylinder cover are fixed together with a cylinder sleeve; in the cylinder sleeve, the lower end of the indicating rod is fixed in a threaded hole at the upper end of the piston by a stud head and a set screw; the upper end of the valve rod is directly hung in a T-shaped groove at the lower end of the piston by a T-shaped joint; the spring is sleeved above the valve rod and at the lower end of the piston, and two ends of the spring are respectively contacted with the piston and the cylinder cover joint; the upper end of the indicating rod and the lower end of the valve rod respectively penetrate through the center holes of the cylinder cover joint and the cylinder cover to extend out, so that a sealing cavity between the piston and the cylinder cover becomes a hydraulic oil cylinder, and a sealing cavity between the piston and the cylinder cover joint becomes a compression cylinder and a spring working chamber.

In addition, a radial pressure relief small hole is processed on the cylinder with a longer cylinder cover joint; the outer surface of the valve body is added with a flow direction mark, and two radial pressure balance holes are symmetrically drilled on the side wall of the inlet valve seat.

Because the spring working chamber is simultaneously designed into the sealed compression cylinder, the compressed air is utilized to assist the spring to close the valve, so that the reliability of closing the safety valve is improved; the T-shaped joint at the upper end of the valve rod is directly hung in the T-shaped groove at the lower end of the piston, the upper end of the spring is directly contacted with the lower end of the piston, the product structure is simplified, the cost and the price are reduced, and meanwhile, the valve rod is enabled to have large movement allowance, so that adverse effects of different axialities of various parts are eliminated. In addition, a radial pressure relief hole is processed on the joint of the cylinder cover, so that the damage of pipeline pressure to a compression cylinder and a spring working chamber when the sealing parts of the valve cover and the valve rod are leaked can be eliminated; two pressure balance holes are symmetrically drilled on the side wall of the inlet valve seat in the valve body, so that the working pressure inside and outside the pipeline and the valve cavity can be balanced, the phenomenon of air compression or vacuum caused by the change of the volume in the valve cavity is prevented, and the valve is easier to open and close.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention in full section;

fig. 2 is a schematic view of the flow direction mark outside the valve body of the present invention.

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

1. the valve comprises a valve body, 2, a flashboard, 3, an inlet valve seat, 4, a sand baffle plate, 5, a sealing gasket ring, 6, a valve cover, 7, a bolt and nut, 8, a valve rod, 9, a plastic plug, 10, a cylinder cover joint, 11, a cylinder sleeve, 12, a spring, 13, a piston, 14, a set screw, 15, an indicating rod, 16, a countersunk screw, 17, a cylinder cover, 18, a pressing cap, 19, a small O-shaped ring, 20, a plug, 21, a large O-shaped ring, 22, a sealing assembly, 23, a grease injection valve, 24, an outlet valve seat, 25, a composite sealing ring, 26 and a supporting seat.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

the utility model discloses can divide into two major components of hoist mechanism and gate valve main part, wherein: the opening and closing mechanism part consists of a valve rod 8, a plastic plug 9, a cylinder cover joint 10, a cylinder sleeve 11, a spring 12, a piston 13, a set screw 14, an indicating rod 15, a sunk screw 16, a cylinder cover 17, a pressing cap 18, a small O-shaped ring 19, a plug 20 and a large O-shaped ring 21; the main body part of the gate valve consists of a valve body 1, a gate plate 2, an inlet valve seat 3, a sand blocking plate 4, a sealing gasket ring 5, a valve cover 6, a bolt nut 7, a sealing component 22, a grease injection valve 23, an outlet valve seat 24, a composite sealing ring 25 and a supporting seat 26; the two large components are connected with a screw column body at the upper end of the valve cover 6 through a large-diameter threaded hole at the lower end of the cylinder cover joint 10 and are fixed by two set screws 14; the valve rod 8 in the valve body 1 is inserted through the valve cover 6 and the central hole of the sealing component 22, and is connected with the inverted T-shaped groove at the upper end of the gate plate 2 by the inverted T-shaped joint at the lower end to form a complete functional body.

In the opening and closing mechanism: the piston 13 carries two large O-rings 21 and is arranged in the cylinder sleeve 11; the upper end of the piston 13 is fixedly connected with a stud head of an indicating rod 15 by a threaded hole and a set screw 14; the lower end of the piston 13 is connected with a T-shaped joint at the upper end of the valve rod 8 by a T-shaped groove; the inner hole of the spring 12 is sleeved above the valve rod 8 and at the lower end of the piston 13, the upper end of the spring is directly contacted with the piston 13, and the lower end of the spring is contacted with the upper end surface of the cylinder cover joint 10; the cylinder cover joint 10 and the cylinder cover 17 are respectively provided with two small O-shaped rings 19 and two large O-shaped rings 21 which are connected with flanges at two ends of the cylinder sleeve 11 by using countersunk screws 16; the valve rod 8 and the indicating rod 15 respectively penetrate through central holes of the cylinder cover joint 10 and the cylinder cover 17, so that a sealing cavity between the piston 13 and the cylinder cover 17 becomes a hydraulic oil cylinder, and the sealing cavity between the piston 13 and the cylinder cover joint 10 becomes a working chamber of a compression cylinder and a spring 12; under the respective action of hydraulic oil, compressed air and a spring 12, a piston 13 drives a valve rod 8 to move up and down to drive the safety valve to open or close.

The cylinder cover joint 10 is a hollow rotating body part, the upper half part of the hollow rotating body part is a flange and a shorter cylinder, the lower half part of the hollow rotating body part is a longer cylinder, and the center of the hollow rotating body part is a through hole which is large at the upper part and the lower part and small in the middle; two grooves are inscribed in the small through hole in the middle, and a small O-shaped ring 19 is arranged in the grooves and used for sealing the valve rod 8; the upper end is a larger transition round hole without other functions; the lower end is a large threaded hole which is connected with the valve cover 6. Uniformly distributed stepped holes are processed on the flange plane of the cylinder cover joint 10, two grooves are processed on a shorter cylinder, and large O-shaped rings 21 are arranged in the grooves and are used for connecting the cylinder sleeve 11; on the side of the flange, a stepped hole with a tapered thread at the inlet is machined, and the stepped hole is closed by a plug 20 when leaving the factory so as to be used when the valve is maintained. A radial small hole is processed on the lower half part of the cylinder cover joint 10 and the upper side of the longer cylinder body and is communicated with a tool withdrawal groove of a large threaded hole inside, a plastic plug 9 is arranged at an orifice, and when leakage occurs at the valve rod 8 and the sealing component 22, the plastic plug can automatically pop up for pressure relief and alarm; two symmetrical small radial threaded holes are processed at the lower side of the longer cylinder, and a set screw 14 is arranged in each hole to prevent the threaded connection part of the cylinder cover joint 10 and the valve cover 6 from loosening.

The cylinder head 17 is also a hollow rotating body part: the upper half part of the valve is a screw column body with smaller diameter and is connected with a blind screw hole of a pressing cap 18 so as to press a sealing indication rod 15 before the valve is used and keep the safety valve in an open state; the lower half part of the cylinder sleeve is provided with a large straight flange and a shorter cylinder, uniformly distributed step holes are processed on the plane of the flange, two grooves are processed on the shorter cylinder, and large O-shaped rings 21 are arranged in the grooves and are used for connecting the cylinder sleeve 11; the center of the piston is provided with a through hole with a large lower part and a small upper part, the through hole with the small upper part is internally provided with two grooves, a small O-shaped ring 19 for sealing the indicating rod 15 is arranged in the through hole, and a large transition round hole is arranged at the lower part and is used for accommodating the upper end of the piston 13; a stepped hole with a conical thread at the inlet is processed on the side surface of a flange of the cylinder cover 17, and the stepped hole is closed by a plug 20 when leaving a factory and is used for connecting a hydraulic oil pipeline when in use.

In the gate valve body: the middle of the valve body 1 is a cylinder, and the left end and the right end of the valve body are provided with extended neck flanges. The center of the column body is a blind hole valve cavity with an upward opening, an inlet valve seat 3 and an outlet valve seat 24 are arranged in the valve cavity, two composite sealing rings 25 are respectively arranged at the outer sides of the two valve seats, a flashboard 2 is arranged between the two valve seats, a supporting seat 26 is arranged below the flashboard 2 and the two valve seats, sand blocking plates 4 are arranged at the two sides of the flashboard 2 and above the two valve seats, and a 'bridge' shaped groove connected with a valve rod 8 is processed at the upper end of the flashboard 2; the upper end surface of the cylinder is provided with a 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 a left channel hole and a right channel hole which are vertically crossed with the valve cavity hole, and both end faces of the flange are respectively provided with a trapezoidal cushion ring groove and uniformly distributed bolt holes for external connection. The valve cover 6 is the same as the valve cover part of the common hydraulic flat valve, a hollow screw column body connected with the cylinder cover joint 10 is arranged above the valve cover 6, a flange connected with the valve body 1 is arranged below the valve cover, and a sealing component 22 is arranged in a step through hole in the center; the sealing component 22 comprises a split cap, two gaskets and three bud-shaped sealing rings, and is compressed by threads to seal the valve rod 8; the flange plane of the valve cover 6 is provided with a gasket ring groove and uniformly distributed bolt holes for connecting with the valve body 1; a stepped hole with a conical thread at the inlet is drilled on the side surface of the flange, and a grease injection valve 23 is arranged in the stepped hole and used for injecting sealing grease into the valve so as to improve the sealing performance of the valve.

The safety valve is always in a normally open state during normal operation, under the combined action of the working pressure of a pipeline, the elastic force of the spring 12 and the reaction force of compressed air, the sealing performance of a hydraulic system is greatly required, the flashboard 2 can be displaced if the leakage happens slightly, and the safety valve can rapidly lose the sealing performance under the scouring and abrasion of a high-pressure sand-containing medium. In addition, when the gate plate 2 and the valve rod 8 move up and down in the sealed valve cavity, the change of the volume is caused, and the generated compressed air or negative pressure vacuum affects the opening and closing of the valve. Therefore, the utility model discloses increase at the surface of valve body 1 and have the flow direction sign to on the lateral wall of import disk seat 3, the symmetry ground has bored two radial pressure balance holes, in order to reach directional installation, keeps the pressure balance of the valve body inside, reduces its harmful effects.

Claims

1. The utility model provides a quick cut-off relief valve, by the starting and stopping mechanism with the gate valve main part constitute, characterized by: in the opening and closing mechanism, a cylinder cover joint, a cylinder cover and a sealing element and a connecting element carried by the cylinder cover are fixed together with a cylinder sleeve; in the cylinder sleeve, the lower end of the indicating rod is fixed in a threaded hole at the upper end of the piston by a stud head and a set screw; the upper end of the valve rod is directly hung in a T-shaped groove at the lower end of the piston by a T-shaped joint; the spring is sleeved above the valve rod and at the lower end of the piston, and two ends of the spring are respectively contacted with the piston and the cylinder cover joint; the upper end of the indicating rod and the lower end of the valve rod respectively penetrate through the center holes of the cylinder cover joint and the cylinder cover to extend out, so that a sealing cavity between the piston and the cylinder cover becomes a hydraulic oil cylinder, and a sealing cavity between the piston and the cylinder cover joint becomes a compression cylinder and a spring working chamber.

2. The quick-disconnect safety valve of claim 1, further comprising: a radial small hole is processed on the lower half part of the cylinder cover joint and the upper side of the longer cylinder and is communicated with a tool withdrawal groove of a large threaded hole inside, and a plastic plug is arranged at an orifice.

3. The quick-disconnect safety valve of claim 1, further comprising: the outer surface of the valve body is added with a flow direction mark, and two radial pressure balance holes are symmetrically drilled on the side wall of the inlet valve seat.