CN111636837A

CN111636837A - High-pressure valve for drilling mud system

Info

Publication number: CN111636837A
Application number: CN202010401153.2A
Authority: CN
Inventors: 郑雪坤; 董云飞; 王委; 赵贞宝; 胡宁; 薛程; 罗辉; 陈荣斌
Original assignee: Sinopec Oilfield Service Corp; Sinopec East China Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec East China Petroleum Engineering Corp
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-09-08

Abstract

The invention relates to a high-pressure valve for a drilling mud system, wherein a through fluid channel is arranged in a valve body, a flashboard is inserted in a valve seat at the middle section of the fluid channel, the top of the flashboard is connected with a valve rod, the valve rod penetrates out of the center of a valve cover upwards to realize sealing, a cylinder body is arranged above the valve cover, a hydraulic cylinder base at the lower end of the cylinder body is screwed on the periphery of a central boss of the valve cover, a cylinder cover is arranged at the top of the cylinder body, the valve rod penetrates out of the central hole of the cylinder cover upwards to realize sealing with; one side of the cylinder body is connected with a cylinder body connecting block, the upper part of the cylinder body connecting block is provided with an upper oil port of the connecting block which is communicated with an upper oil port of the cylinder body, an outer end port of the upper oil port of the connecting block is screwed with an upper oil port connector, the lower part of the cylinder body connecting block is provided with a lower oil port of the connecting block which is communicated with a lower oil port of the cylinder body, and an outer end port of the lower oil port of the. The valve realizes hydraulic quick opening and closing, and greatly improves the working efficiency and the safety of underground construction.

Description

High-pressure valve for drilling mud system

Technical Field

The invention relates to a valve for an oil drilling machine, in particular to a high-pressure valve for a drilling mud system, and belongs to the technical field of valves for oil drilling machines.

Background

A mud circulating system matched with petroleum drilling machine is characterized by that one or more mud pumps can inject the high-pressure fluid into the bottom of well through manifold, gate group, hose, drilling tool and drill bit water hole to wash out the high-pressure fluid from bottom of well and carry out the solid-phase particles in the well. The fluid drilling fluid participating in circulation has the following functions: firstly, cleaning the bottom of a well, suspending and carrying rock debris, and keeping a well clean; the formation pressure is balanced, the well wall is stabilized, and well collapse, blowout and well leakage are prevented; thirdly, water power is transmitted to help the drill bit to break the rock; fourthly, power is transmitted to the underground power drilling tool; fifthly, cooling the drill bit and the drilling tool; and sixthly, the drilling fluid is used for geological and gas logging.

According to different construction capacities of the drilling machines, the number of the matched slurry pumps is different from one to four, the drilling machines of 2000 meters and below are matched with one pump at present, the drilling machines of 3000 plus 5000 meters are matched with two pumps, the drilling machines of 7000 plus 9000 meters are matched with three pumps, and the drilling machines of 12000 meters and above are matched with four pumps. The deeper a drilling machine is used for constructing a borehole, the more the mud pump platforms are, the more control gates of a drilling fluid circulating system are, and the more complex the gate groups are, so as to ensure normal discharge capacity and pumping pressure.

The conventional drilling fluid valve group is manually operated, the opening and closing purposes are achieved by lifting a screw rod, a hand wheel needs to be rotated for 12-14 circles when a single valve is opened, the operation process is 30-60 seconds long, any one slurry pump is switched to be used, at least two valves on the valve group are operated, and the consumed time is about 3 minutes.

The ground valve group is located on the ground behind the right side of the drill floor and is far away from a driller room, when the valve needs to be switched, the driller needs to communicate with an operator (generally a secondary driller) of the valve group through telephone, signal and gesture actions, and special operation environments such as high field noise, poor light at night and the like easily cause communication errors, so that equipment is damaged, and construction time is delayed.

The drilling fluid valve group is positioned in a high-pressure area, so that sand setting at the well bottom is avoided, construction safety is ensured, pump stopping time needs to be reduced as much as possible, and operation under pressure is needed. If the auxiliary driller enters the high-pressure area switch valve in the pressure-holding state, the personal safety of the auxiliary driller is threatened by the puncture of the valve, and potential safety hazards exist. And the valve is opened under the pressure build-up state, so that the valve is difficult to open and has low opening speed, and the flashboard is easy to erode.

For preventing the lead screw of bad valve is pounded to the heavy object, the lead screw is equipped with the valve rod guard shield outward, and the valve rod guard shield also leads to the valve to open and the closed state is distinguished unclear when protecting the lead screw. If the valve is in a half-open state, the slurry flow is easily influenced, and even erosion is generated on the gate. If the gap between the screw rod and the valve rod protective cover is seriously rusted or enters dust, the screw rod is not easy to rotate.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a high-pressure valve for a drilling mud system, which realizes the quick opening and closing of the valve through hydraulic oil and greatly improves the working efficiency and the safety of underground construction.

In order to solve the technical problems, the high-pressure valve for the drilling mud system comprises a valve body, wherein a valve cover is arranged at the top of the valve body, a fluid passage which is communicated from left to right is arranged in the valve body, a valve seat is arranged at the middle section of the fluid passage, a flashboard is inserted in the valve seat, the top of the flashboard is connected with a valve rod, the valve rod penetrates out of a central hole of the valve cover upwards and is sealed with the valve cover, a cylinder body is arranged above the valve cover, a hydraulic cylinder base is arranged at the lower port of the cylinder body, a base internal thread section which extends downwards is arranged on the lower end surface of the hydraulic cylinder base, the base internal thread section is screwed on the periphery of a central boss of the valve cover, a cylinder cover is arranged at the; one side of cylinder body is connected with the cylinder body connecting block, and the upper portion of cylinder body connecting block is equipped with the hydraulic fluid port on the connecting block that link up mutually with cylinder body epicoele hydraulic fluid port, and the outer port of hydraulic fluid port has connect soon to go up the hydraulic fluid port on the connecting block, and the lower part of cylinder body connecting block is equipped with the hydraulic fluid port under the connecting block that link up mutually with cylinder body cavity hydraulic fluid port, and the outer port of hydraulic fluid port has connect soon to have.

Compared with the prior art, the invention has the following beneficial effects: when the valve is opened hydraulically, high-pressure oil enters the lower cavity of the cylinder body through the lower cavity oil port connector, oil in the upper cavity of the cylinder body flows out through the upper cavity oil port connector, the piston drives the valve rod to move upwards, the lower end of the valve rod drives the flashboard to move upwards to open the fluid channel, and the valve rod nut leaves the nut sleeve and moves upwards along with the valve rod. When the valve is hydraulically closed, high-pressure oil enters an upper cavity of the cylinder body through an upper cavity oil port connector, oil in a lower cavity of the cylinder body flows out through a lower cavity oil port connector, the piston drives the valve rod to move downwards, the lower end of the valve rod drives the flashboard to move downwards to close the fluid passage, and the valve rod nut follows the valve rod to move downwards and falls on the nut sleeve. The hydraulic power opening and closing valve is adopted, so that the opening or closing action time is only 1 second, any one slurry pump is switched, or a slurry flow channel is replaced, and the operation can be finished within 3-5 seconds. The valve is not influenced by the operation under pressure in the construction link, can be quickly opened or closed to prevent the erosion of high-pressure fluid to the flashboard, and prolongs the service life of the valve. The hydraulic oil in the cylinder body can form the auto-lock, prevents to take place to lead to the valve to close unusually because of vibrations. The driller can realize remote control by switching the hydraulic oil circuit in the driller room, and does not need to enter a high-pressure area switch valve by an auxiliary driller, thereby avoiding potential safety hazards caused by high-pressure leaked slurry.

As an improvement of the invention, the upper oil port of the connecting block is communicated with the inner port of the lower oil port of the connecting block through a connecting block throttling oil duct, and the middle section of the connecting block throttling oil duct is provided with a throttling valve core which can cut off or run through the throttling valve core. When the hydraulic operation is carried out, the throttle valve core cuts off the throttle oil duct of the connecting block. When the manual operation is performed, the throttle valve core is adjusted to enable the throttle oil duct of the connecting block to be communicated, at the moment, the upper cavity of the cylinder body is communicated with the lower cavity, the piston is in a floating state, and the interference of the hydraulic cavity on the manual operation is avoided.

As a further improvement of the invention, the throttle valve core comprises a throttle valve core sealing section positioned at the inner end and a throttle valve core thread section positioned at the outer end, wherein a plurality of throttle valve core radial holes which are communicated in a shape like a Chinese character 'mi' are arranged on the throttle valve core sealing section, the throttle valve core thread section is screwed in a throttle valve core nut, and the throttle valve core nut is screwed in a counter bore of the cylinder body connecting block. And when the radial hole of the throttle valve core and the throttle oil duct of the connecting block are positioned on the same cross section and the holes are aligned, the throttle oil duct of the connecting block is communicated, and the throttle valve core enters a manual operation state at the moment. When the radial hole of the throttle valve core and the throttle oil duct of the connecting block are not on the same cross section, the throttle oil duct of the connecting block is cut off, and then the hydraulic operation state is entered.

As a further improvement of the invention, a top dead center proximity switch for detecting the top dead center of the piston is screwed on the cylinder cover, and a bottom dead center proximity switch for detecting the bottom dead center of the piston is screwed on the base of the hydraulic cylinder. When the piston reaches the top dead center, the fluid channel is completely opened, the top dead center proximity switch sends a signal to the control system, and the valve is displayed to be in an open state on the operation panel; when the piston reaches bottom dead center, the fluid passage is completely closed and the bottom dead center proximity switch signals the control system that the valve is closed on the operating panel. The driller can conveniently and accurately master the state of the valve, and the control system can close the hydraulic oil channels of the upper cavity and the lower cavity of the cylinder body to realize self-locking.

As a further improvement of the invention, a valve rod thread section is arranged at the upper part of the valve rod, the valve rod thread section is screwed in the valve rod nut, the lower part of the valve rod nut is connected with a nut sleeve through an I-shaped key, the nut sleeve is rotatably fixed in a valve rod nut seat, and the lower end of the valve rod nut seat is screwed on a central boss of the cylinder cover. When the hydraulic operation is carried out, the I-shaped key is not placed in the key groove, and the valve rod nut and the nut sleeve are in a separated state. When the manual operation is carried out, the I-shaped key is embedded into the key groove, so that the valve rod nut is combined with the nut sleeve; the nut sleeve is rotationally limited in the valve rod nut seat by the nut sleeve lock nut and the bearing, the valve rod pulls the flashboard to lift by rotating the valve rod nut by a tool, at the moment, the connecting block throttling oil duct is cut off by the throttling valve core, and the piston is in a floating state.

As a further improvement of the invention, the lower circumference of the nut sleeve is provided with a nut sleeve convex ring, the periphery of the nut sleeve convex ring is in clearance fit with the inner hole wall of the valve rod nut seat, the upper part of the nut sleeve convex ring is supported on the inner step of the valve rod nut seat through a nut sleeve upper bearing, the lower part of the nut sleeve convex ring is supported on a nut sleeve lock nut through a nut sleeve lower bearing, and the external thread of the nut sleeve lock nut is screwed in the internal thread of the valve rod nut seat. The nut sleeve locking nut, the nut sleeve upper bearing, the nut sleeve lower bearing and the inner step of the valve rod nut seat realize the axial positioning of the nut sleeve convex ring, and the nut sleeve upper bearing and the nut sleeve lower bearing enable the nut sleeve to rotate more flexibly and enable the nut sleeve to be lighter and lighter during manual operation.

In a further improvement of the present invention, the valve stem nut seat and the outer periphery of the upper end of the valve stem are covered with a valve stem guard, and the lower end of the valve stem guard is screwed to the outer periphery of the lower end of the valve stem nut seat. The valve rod protective cover can prevent the valve rod from being polluted by dust or being smashed by heavy objects.

As a further improvement of the invention, the upper part of the central hole of the valve cover is provided with a stuffing box, the bottom of the stuffing box is provided with stuffing sealed at the periphery of the valve rod, the upper port of the stuffing box is screwed with a stuffing gland, and the lower end surface of the hydraulic cylinder base is pressed above the stuffing gland. The packing gland compresses the packing in the packing box to realize reliable sealing between the valve rod and the valve cover central hole, and the hydraulic cylinder base is pressed on the packing gland to prevent the packing from loosening due to vibration.

As a further improvement of the invention, the upper part of the valve rod nut is provided with a square tenon or is symmetrically provided with nut lugs extending outwards along the radial direction. After the valve rod protective cover is removed, the valve rod nut can be clamped on the square tenon through a spanner or a hand wheel to rotate; an extension bar can be sleeved on the nut lug so as to easily rotate the valve rod nut and realize the opening and closing of the valve.

As a further improvement of the invention, the lower end of the valve rod is provided with a valve rod lower tenon with an I-shaped cross section, and the upper end of the flashboard is embedded in a groove of the valve rod lower tenon. The cooperation of tenon and flashboard under the valve rod that is I shape cross-section makes and realizes axial positioning between valve rod and the flashboard, and if the valve rod produced when rotating, the flashboard can not bear torsion, makes the lift of flashboard nimble more and the life of extension valve.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

FIG. 1 is a schematic representation of a high pressure valve for a drilling mud system of the present invention as it is hydraulically opened.

Figure 2 is a schematic diagram of the high pressure valve hydraulic shut-off for the drilling mud system of the present invention.

Figure 3 is a schematic view of the drilling mud system of the present invention when manually operated with a high pressure valve.

FIG. 4 is a state diagram of the valve stem nut and the nut sleeve of the present invention connected by an I-shaped key.

Fig. 5 is an enlarged view of the extension bar of fig. 3 with the extension bar removed.

In the figure: 1. a valve body; 1a. a fluid channel; 2. a valve cover; 2a, filling; 2b, a packing gland; 3. a valve seat; 4. a shutter plate; 5. a valve stem; 5a, a lower tenon of the valve rod; 6. a valve stem nut; an I-shaped key; 6b, a nut sleeve; 6b1, sleeving a convex ring on the nut; 6c, sleeving a bearing on the nut sleeve; 6d, sleeving a lower bearing with a nut; 7. the nut sleeve is locked; 8. a valve stem nut seat; 9. a cylinder body; 9a, an upper cavity oil port of the cylinder body; 9b, a lower cavity oil port of the cylinder body; 9c, a piston; 10. a cylinder cover; 11. a hydraulic cylinder base; 12. a cylinder body connecting block; 12a, an oil feeding port of the connecting block; 12b, a connecting block lower oil port; 12c, an upper cavity oil port connector; 12d, a lower cavity oil port joint; 12e, connecting block throttling oil duct; 12f. throttling spool nut; 13. a throttle valve cartridge; 13a, throttling valve core radial holes; 14. a valve stem shroud; 15. a nut lug; 16. lengthening a rod; jk1. top dead center proximity switch; jk2. bottom dead center proximity switch.

Detailed Description

As shown in fig. 1, the high-pressure valve for a drilling mud system of the invention comprises a valve body 1, a valve cover 2 is arranged on the top of the valve body 1, a fluid passage 1a which is through from left to right is arranged in the valve body 1, a valve seat 3 is arranged on the middle section of the fluid passage 1a, a gate plate 4 is inserted in the valve seat 3, a valve rod 5 is connected on the top of the gate plate 4, the valve rod 5 penetrates out of the central hole of the valve cover upwards and is sealed with the valve cover 2, a cylinder body 9 is arranged above the valve cover 2, a hydraulic cylinder base 11 is arranged on the lower port of the cylinder body 9, a base internal thread section which extends downwards is arranged on the lower end surface of the hydraulic cylinder base 11, the base internal thread section is screwed on the periphery of the central boss of the valve cover 2, a cylinder cover 10 is arranged on the top of; one side of the cylinder 9 is connected with a cylinder connecting block 12, the upper part of the cylinder connecting block 12 is provided with a connecting block upper oil port 12a communicated with the cylinder upper oil port 9a, the outer end port of the connecting block upper oil port 12a is screwed with an upper oil port connector 12c, the lower part of the cylinder connecting block 12 is provided with a connecting block lower oil port 12b communicated with the cylinder lower oil port 9b, and the outer end port of the connecting block lower oil port 12b is screwed with a lower oil port connector 12d.

When the valve is opened hydraulically, high-pressure oil enters the lower cavity of the cylinder body 9 through the lower cavity oil port connector 12d, the oil in the upper cavity of the cylinder body flows out through the upper cavity oil port connector 12c, the piston 9c drives the valve rod 5 to move upwards, the lower end of the valve rod 5 drives the gate plate 4 to move upwards to open the fluid channel 1a, and the valve rod nut 6 leaves the nut sleeve 6b and moves upwards along with the valve rod 5.

As shown in fig. 2, when the valve is closed hydraulically, high-pressure oil enters the upper chamber of the cylinder 9 through the upper chamber oil port connector 12c, oil in the lower chamber of the cylinder flows out through the lower chamber oil port connector 12d, the piston 9c drives the valve rod 5 to move downwards, the lower end of the valve rod 5 drives the gate plate 4 to move downwards to close the fluid passage 1a, and the valve rod nut 6 follows the valve rod 5 to move downwards and falls on the nut sleeve 6b. The hydraulic power opening and closing valve is adopted, so that the opening or closing action time is only 1 second, any one slurry pump is switched, or a slurry flow channel is replaced, and the operation can be finished within 3-5 seconds.

The upper oil port 12a of the connecting block is communicated with the inner port of the lower oil port 12b of the connecting block through a connecting block throttling oil duct 12e, and a throttling valve core 13 capable of cutting off or penetrating the connecting block throttling oil duct 12e is arranged in the middle section of the connecting block throttling oil duct 12e. When hydraulically operated, the throttle valve core 13 cuts off the connector block throttle passage 12e. During manual operation, the throttle valve core 13 is adjusted to enable the connecting block throttle oil duct 12e to be communicated, at the moment, the upper cavity and the lower cavity of the cylinder body 9 are communicated, the piston 9c is in a floating state, and interference of a hydraulic cavity on manual operation is avoided.

The throttle valve core 13 comprises a throttle valve core sealing section positioned at the inner end and a throttle valve core thread section positioned at the outer end, the throttle valve core sealing section is provided with a plurality of throttle valve core radial holes 13a which are communicated in a meter shape, the throttle valve core thread section is screwed in a throttle valve core nut 12f, and the throttle valve core nut 12f is screwed in a counter bore of the cylinder body connecting block 12. And (3) rotating the throttle valve core 13 to enable the sealing section of the throttle valve core to generate axial displacement relative to the connecting block throttling oil duct 12e, and when the radial hole 13a of the throttle valve core and the connecting block throttling oil duct 12e are positioned on the same cross section and the holes are aligned, conducting the connecting block throttling oil duct 12e, and then entering a manual operation state. When the throttle valve core radial hole 13a and the connecting block throttling oil channel 12e are not on the same cross section, the connecting block throttling oil channel 12e is cut off, and at the moment, the hydraulic operation state is entered.

A top dead center proximity switch JK1 for detecting the top dead center of the piston is screwed on the cylinder cover 10, and a bottom dead center proximity switch JK2 for detecting the bottom dead center of the piston is screwed on the hydraulic cylinder base 11. When the piston 9c reaches the top dead center, the fluid passage 1a is fully opened, and the top dead center proximity switch JK1 signals the control system that the valve is in the open state on the operation panel; when the piston 9c reaches the bottom dead center, the fluid passage 1a is completely closed, and the bottom dead center proximity switch JK2 signals the control system that the valve is in the closed state on the operation panel. The driller can conveniently and accurately master the state of the valve, and the control system can close the hydraulic oil channels of the upper cavity and the lower cavity of the cylinder body to realize self-locking.

As shown in fig. 3 to 5, a stem thread section is provided on the upper portion of the stem 5, the stem thread section is screwed into the stem nut 6, the lower portion of the stem nut 6 is connected to a nut sleeve 6b by an i-key 6a, the nut sleeve 6b is rotatably fixed in the stem nut seat 8, and the lower end of the stem nut seat 8 is screwed onto a central boss of the cylinder head 10. During hydraulic operation, the I-shaped key 6a is not placed in the key groove, and the valve rod nut 6 and the nut sleeve 6b are in a separated state. When the manual operation is carried out, the I-shaped key 6a is embedded into the key groove, so that the valve rod nut 6 is combined with the nut sleeve 6 b; since the nut sleeve 6b is rotatably limited in the valve rod nut seat 8 by the nut sleeve lock nut 7 and the bearing, the valve rod 5 pulls the gate plate 4 to ascend and descend by rotating the valve rod nut 6 by a tool, at the moment, the connecting block throttling oil passage 12e is cut off by the throttling valve core 13, and the piston 9c is in a floating state.

The circumference of the lower part of the nut sleeve 6b is provided with a nut sleeve convex ring 6b1, the periphery of the nut sleeve convex ring 6b1 is in clearance fit with the inner hole wall of the valve rod nut seat 8, the upper part of the nut sleeve convex ring 6b1 is supported on the inner step of the valve rod nut seat 8 through a nut sleeve upper bearing 6c, the lower part of the nut sleeve convex ring 6b1 is supported on the nut sleeve lock nut 7 through a nut sleeve lower bearing 6d, and the external thread of the nut sleeve lock nut 7 is screwed in the internal thread of the valve rod nut seat 8. The nut sleeve locking nut 7, the nut sleeve upper bearing 6c, the nut sleeve lower bearing 6d and the inner steps of the valve rod nut seat 8 realize the axial positioning of the nut sleeve convex ring 6b1, and the nut sleeve upper bearing 6c and the nut sleeve lower bearing 6d enable the nut sleeve 6b to rotate more flexibly and enable the manual operation to be more portable.

The valve rod nut seat 8 and the periphery of the upper end of the valve rod 5 are covered with a valve rod protective cover 14, and the lower end of the valve rod protective cover 14 is screwed on the periphery of the lower end of the valve rod nut seat 8. The valve stem guard 14 prevents the valve stem 5 from being contaminated with dust or being damaged by heavy objects.

The upper portion of valve gap centre bore is equipped with the packing box, and the bottom of packing box is equipped with the packing 2a of sealing in valve rod 5 periphery, and the last port of packing box has connect gland 2b soon, and the lower terminal surface of hydraulic cylinder base 11 is pressed in gland 2b top. The packing gland 2b compresses the packing 2a in the packing box to realize reliable sealing between the valve rod 5 and the valve cover central hole, and the hydraulic cylinder base 11 is pressed on the packing gland 2b to prevent the loosening caused by vibration.

The upper part of the valve rod nut 6 is provided with a square tenon or is symmetrically provided with nut lugs 15 which extend outwards along the radial direction. After the valve rod protective cover 14 is removed, the valve rod nut 6 can be clamped on the square tenon through a spanner or a hand wheel to rotate; an extension bar 16 can also be sleeved on the nut ear rod 15 so as to rotate the valve rod nut 6 more easily to realize the opening and closing of the valve.

The lower end of the valve rod 5 is provided with a valve rod lower tenon 5a with an I-shaped cross section, and the upper end of the flashboard 4 is embedded in a groove of the valve rod lower tenon 5a. The cooperation of tenon 5a and flashboard 4 under the valve rod that is I shape cross-section makes and realizes axial positioning between valve rod 5 and the flashboard 4, and if valve rod 5 produced when rotating, flashboard 4 can not bear torsion, makes the lift of flashboard more nimble and the life of extension valve.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims

1. The utility model provides a high-pressure valve for drilling mud system, includes the valve body, and the valve body top is equipped with the valve gap, is equipped with the fluid passage who link up about in the valve body, and fluid passage's middle section is equipped with the disk seat, has inserted the flashboard in the disk seat, and the top of flashboard is connected with the valve rod, and the valve rod upwards wears out in the valve cover centre bore and realizes sealing its characterized in that with the valve gap: a cylinder body is arranged above the valve cover, a hydraulic cylinder base is arranged at the lower port of the cylinder body, a base internal thread section extending downwards is arranged on the lower end face of the hydraulic cylinder base, the base internal thread section is screwed on the periphery of a central boss of the valve cover, a cylinder cover is arranged at the top of the cylinder body, a valve rod penetrates out of a central hole of the cylinder cover upwards and is sealed with the cylinder cover, a piston is arranged in the cylinder body, and the piston is fixed on the valve rod; one side of cylinder body is connected with the cylinder body connecting block, and the upper portion of cylinder body connecting block is equipped with the hydraulic fluid port on the connecting block that link up mutually with cylinder body epicoele hydraulic fluid port, and the outer port of hydraulic fluid port has connect soon to go up the hydraulic fluid port on the connecting block, and the lower part of cylinder body connecting block is equipped with the hydraulic fluid port under the connecting block that link up mutually with cylinder body cavity hydraulic fluid port, and the outer port of hydraulic fluid port has connect soon to have.

2. The high pressure valve for a drilling mud system of claim 1, wherein: the oil port on the connecting block is communicated with the inner port of the oil port under the connecting block through a connecting block throttling oil duct, and the middle section of the connecting block throttling oil duct is provided with a throttling valve core which can cut off or run through the connecting block throttling oil duct.

3. The high pressure valve for a drilling mud system of claim 2, wherein: the throttling valve core comprises a throttling valve core sealing section positioned at the inner end and a throttling valve core thread section positioned at the outer end, the throttling valve core sealing section is provided with a plurality of throttling valve core radial holes which are communicated in a meter shape, the throttling valve core thread section is screwed in a throttling valve core nut, and the throttling valve core nut is screwed in a counter bore of the cylinder body connecting block.

4. The high pressure valve for a drilling mud system of claim 1, wherein: the cylinder cover is rotatably connected with an upper dead center proximity switch for detecting the upper dead center of the piston, and the hydraulic cylinder base is rotatably connected with a lower dead center proximity switch for detecting the lower dead center of the piston.

5. The high pressure valve for a drilling mud system of claim 2, wherein: the upper portion of the valve rod is provided with a valve rod thread section, the valve rod thread section is screwed in a valve rod nut, the lower portion of the valve rod nut is connected with a nut sleeve through an I-shaped key, the nut sleeve is rotatably fixed in a valve rod nut seat, and the lower end of the valve rod nut seat is screwed on a central boss of the cylinder cover.

6. The high pressure valve for a drilling mud system of claim 5, wherein: the valve rod nut is characterized in that a nut sleeve convex ring is arranged on the circumference of the lower portion of the nut sleeve, the periphery of the nut sleeve convex ring is in clearance fit with the inner hole wall of the valve rod nut seat, the upper portion of the nut sleeve convex ring is supported on an inner step of the valve rod nut seat through a nut sleeve upper bearing, the lower portion of the nut sleeve convex ring is supported on a nut sleeve lock nut through a nut sleeve lower bearing, and the external thread of the nut sleeve lock nut is screwed in the internal thread of the valve rod nut seat.

7. The high pressure valve for a drilling mud system of any of claims 1 to 6, wherein: the valve rod nut seat and the periphery of the upper end of the valve rod are covered with a valve rod protective cover, and the lower end of the valve rod protective cover is screwed on the periphery of the lower end of the valve rod nut seat.

8. The high pressure valve for a drilling mud system of any of claims 1 to 6, wherein: the upper portion of valve gap centre bore is equipped with the packing box, the bottom of packing box is equipped with the filler of sealed in the valve rod periphery, the last port of packing box has connect with gland soon, and the lower terminal surface of pneumatic cylinder base is pressed in gland top.

9. The high pressure valve for a drilling mud system of any of claims 1 to 6, wherein: the upper part of the valve rod nut is provided with a square tenon or nut lugs which extend outwards along the radial direction.

10. The high pressure valve for a drilling mud system of any of claims 1 to 6, wherein: the lower extreme of valve rod is equipped with the lower tenon of valve rod that is I shape cross-section, the upper end of flashboard inlays in the recess of lower tenon of valve rod.