CN201487237U

CN201487237U - Pilot operated stop valve

Info

Publication number: CN201487237U
Application number: CN2009201704961U
Authority: CN
Inventors: 姚阜宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-12
Filing date: 2009-07-29
Publication date: 2010-05-26
Anticipated expiration: 2019-07-29

Abstract

The utility model relates to a pilot operated stop valve, which comprises a valve body, a valve rod, a valve clack, a bracket penetrated by the valve rod, and a hand wheel driving the valve rod to move up and down. The valve body comprises a first part and a second part, which are integrated. A through medium channel is arranged in the first part of the valve body and forms an inlet end and an outlet end on the valve body. The medium channel comprises an inlet channel communicated with the inlet end and an outlet channel communicated with the outlet end. The joint of the inlet channel and the outlet channel is provided with a valve seat. A control channel is arranged in the second part of the valve body and is communicated with the valve seat. The control channel and the outlet channel are arranged slantwise. The valve rod is inserted and arranged in the control channel, extends into one end of the control channel and is connected with the valve clack. The valve clack is arranged on the valve seat in a setting manner. The neutral axis of the outlet end is coaxial with the neutral axis of the outlet channel. The utility model can prevent delivery pipelines from being pierced and has the advantages of high security, strong reliability and good sealing performance.

Description

Pilot-operated stop valve

Technical Field

The utility model relates to a stop valve especially relates to a can be at high temperature high pressure high sand special operating mode condition under the medium all the time along the pilot-operated type stop valve that is on a parallel with the output of pipeline direction.

Background

A stop valve is a control device that is common in the industry and can control the opening and closing of a delivery line and the flow of a medium. The method is widely applied to the industries of petroleum, chemical engineering, light textile, power stations (including nuclear power stations) and the like, and particularly in the oil field exploitation, the exploited crude oil contains a large amount of solid particle media and is viscous, so that the exploited thick oil has the characteristics of high temperature, high pressure and high sand yield. At present, a straight-flow stop valve is generally used for controlling the opening and closing of a conveying pipeline and controlling the flow of thick oil, and certain defects exist.

Fig. 4 is a schematic structural diagram of a straight-flow type stop valve in the prior art. As shown in fig. 4, the straight-flow type stop valve mainly includes a valve body 41, a valve flap 42, a lower stem 43, an upper stem 44, a stem nut 48, a hand wheel 45, and the like. The hand wheel 45 is connected with an upper valve rod 44, the upper valve rod 44 is in threaded connection with the valve rod nut 48, the valve rod nut 48 is fixed on the bracket 40, a through medium channel 46 is formed in the valve body 41, the medium channel 46 comprises an inlet channel 461 and an outlet channel 462, the inlet channel 461 is connected and communicated with the outlet channel 462 at the middle part of the valve body 41, the inlet channel 461 is an inlet end 463 at the opening of the valve body 41, and the outlet channel 462 is an outlet end 464 at the opening of the valve body 41. The inlet end 463 and the outlet end 464 are respectively connected with a conveying pipeline, and the thick oil with high temperature and high pressure and high sand content can flow into the valve body 41 from the inlet end 463 through the conveying pipeline, is conveyed to the outlet end 464 through the medium channel 46 in the valve body 41, and enters the conveying pipeline 51. A control passage 47 is further provided in the valve body 41, the control passage 47 communicates with the junction of the inlet passage 461 and the outlet passage 462, and the control passage 47 and the outlet passage 462 are inclined at an angle of 45 °. A valve seat is arranged at the joint, and a lower valve rod 43 and a valve clack 42 are arranged in a control channel 47. The flap 42 can be seated on the valve seat and closes off the medium passage 46. The specific process is as follows: the handwheel 45 is rotated by external force to drive the upper valve rod 44 to displace downwards, and further drive the lower valve rod 43 and the valve clack 42 connected at the front end of the lower valve rod 43 to move downwards, so that the valve clack 42 enters the medium channel 46 from the control channel 47 and is seated on the valve seat 50 to close the medium channel 46. At this time, the thick oil cannot flow through the medium passage 46, and the valve body is in a closed state. When the valve needs to be opened, the hand wheel 45 is rotated reversely, the hand wheel 45 drives the upper valve rod 44 to move upwards, the upper valve rod 44 drives the lower valve rod 43 to move upwards, the valve clack 42 is lifted, a certain gap is formed between the valve clack 42 and the medium channel 46, at the moment, thick oil can flow through the gap, and the valve body is in an opening state. The flow rate of the thick oil can be controlled by controlling the size of the gap. However, although the conventional straight-flow cut-off valve can perform the functions of opening and closing and controlling the flow rate of thick oil, the following defects still exist in the structure:

1. as shown in fig. 5, because the central axis of the outlet end 464 of the existing straight-flow stop valve is not coaxial with the central axis of the outlet passage 462, but forms a certain included angle, which is 15 °, when the thick oil with high temperature, high pressure and high sand content flows into the delivery pipeline 51 from the outlet end 464 of the valve body 41, the thick oil flows out from the outlet end 464 in the direction parallel to the central axis of the outlet passage 464, and the thick oil obliquely impacts the inner wall of the delivery pipeline 51 (as shown in the arrow direction in fig. 5), so that the pipe wall of the delivery pipeline 51 is easily pierced, the delivery pipeline is leaked, and great potential safety hazard is brought to production.

2. Fig. 6 is a schematic view of a valve flap structure of a conventional direct flow type stop valve. As shown in fig. 6, the valve flap 42 is in a gyro shape, the valve flap 42 can move along the inner wall of the control channel 47, the contact area between the gyro-shaped valve flap 42 and the control channel 47 is large, and the precision is difficult to achieve during processing, and in the movement process of the valve flap 42, a large gap is generated between the valve flap 42 and the inner wall of the control channel 47 due to abrasion and cavitation, so that the valve flap 42 is easy to deflect during movement, and the valve flap 42 and the valve seat 50 are not tightly matched with each other, poor in sealing performance and form internal leakage.

3. In the existing direct-flow stop valve, a hand wheel 45 is connected with an upper valve stem 44, and a valve stem nut 48 is in threaded connection with the upper valve stem 44. Under the working condition of high temperature and high pressure, because the friction coefficient between the valve rod nut 48 and the upper valve rod 44 is large, the threads of the valve rod nut 48 and the upper valve rod 44 which are matched and rotated are easy to be seized, so that the stop valve cannot be opened and cannot be operated normally.

4. In the existing straight-flow stop valve, a stuffing box 49 is arranged on the outer side of a lower valve rod 43 of the existing straight-flow stop valve, and the stuffing box 49 and a bracket 40 are of an integral structure, so that the existing straight-flow stop valve is inconvenient to disassemble, assemble and maintain; and the support 40 and the valve body 41 are connected by threads, so that the assembly moment is large, the sealing performance of the joint is poor, and leakage is easy to generate.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: provided is a pilot type stop valve which can output a medium fluid in the direction of the central axis of the outlet end of a medium passage, avoid the impact of the medium fluid on a delivery pipe, and improve the safety of the delivery pipe.

In order to achieve the above object, the present invention provides a pilot operated stop valve, which comprises a valve body, a valve rod, a valve clack, a support and a hand wheel, wherein the valve body comprises a first part and a second part which are integrally formed, the first part of the valve body is provided with a through medium channel, the medium channel is provided with an inlet end and an outlet end on the valve body, the medium channel comprises an inlet channel communicated with the inlet end and an outlet channel communicated with the outlet end, and a valve seat is arranged at the joint of the inlet channel and the outlet channel; the valve comprises a valve body, a valve rod, a valve clack, a valve rod, a control channel, an outlet channel, a valve rod, a valve clack, a valve rod and a valve rod, wherein the valve rod is inserted into the control channel, the valve rod is connected with the valve clack in an inclined mode, the valve rod is inserted into the control channel, one end, extending into the control channel, of the valve rod is connected with the valve clack, the valve clack can be seated on the valve seat, and.

The utility model discloses in, the axis of control passage with the contained angle of the axis of exit end is 50 ~ 60, preferably 55 to the direction that the control medium flowed out from the valve body.

The utility model discloses in, the inlet channel be the shape of bending, the outlet channel be sharp the line.

The utility model discloses in, the first part of valve body is spoon head shape, and the spoon dorsal part of the first part of valve body of this spoon head shape is kept away from control channel.

In the utility model, the valve clack comprises a cylindrical valve clack body, one end of the valve clack body is provided with a conical sealing part, one end of the valve clack body, which is far away from the sealing part, is provided with an inwards concave containing groove, the inner wall of the containing groove is provided with a ring groove, a retaining ring is arranged in the ring groove, and one end of the valve rod is clamped in the retaining ring; two convex guide rings are arranged on the outer wall of the valve clack body along the radial direction of the cylindrical valve clack body, and play a role in positioning in the opening and closing process of the valve.

The utility model discloses in valve body upper portion the control passage's top seted up the holding portion of hole enlargement, a gland packing box cover is established on the valve rod, its lower extreme holding is in this holding portion to with valve body welded seal fixed connection.

The utility model discloses in, the support mounting in the stuffing box upper end, the lower extreme of support with the upper portion of stuffing box is threaded connection, forms split type structure, makes things convenient for the dismouting.

The utility model discloses in, the upper end of support has the storage tank of indent, and valve-stem nut sets up in this storage tank, valve-stem nut's upper portion protrusion in this storage tank to with the hand wheel rigid coupling, valve-stem nut can set up in this storage tank with rotating, the valve rod with valve-stem nut threaded connection.

The utility model discloses in valve-stem nut with be equipped with twice bearing between the inner wall of the storage tank of support, ensure that the valve is opened and close in a flexible way.

The utility model discloses in a fluting has been seted up along the axial on the valve rod on the lateral wall of support, set up the through-hole that link up this lateral wall along the axis direction of perpendicular to valve rod, a guide positioning pole wears to locate in the through-hole, a holding screw spiro union through-hole, its front end top support in guide positioning pole's one end, guide positioning pole's the other end extends to in the fluting to support and lean on in the grooved bottom.

The utility model discloses compare with current structure down, have following characteristics and advantage:

1. the utility model discloses a pilot-operated type stop valve, its exit channel's axis is coaxial setting with the axis of exit end for when medium fluid (like viscous crude) got into conveying pipeline through the exit end, the flow direction of medium stream was on a parallel with conveying pipeline's axis direction. The impact of the medium fluid on the pipe wall of the conveying pipeline is avoided, and the safety of the conveying pipeline is improved. In a preferred embodiment, the included angle between the central axis of the control channel and the central axis of the outlet end of the medium channel is 50 to 60 degrees, preferably 55 degrees, so as to control the direction of the medium flowing out from the valve body. Consequently, the valve body adopts modified structural design, the first portion of valve body is spoon head shape, and the spoon dorsal part of the first portion of valve body of this spoon head shape is kept away from control passage, compare with current stop valve, the utility model discloses a size of valve body increases to the axis of having guaranteed that exit channel is coaxial setting with the axis of exit end.

2. The utility model discloses a front end of valve rod is connected with the valve clack, and the upper and lower both ends of outer wall at the valve clack are protruding to be equipped with two guide rings, and when the valve clack removed (piston removes promptly) along control passage, the guide ring slided and received the restriction of control passage inner wall along the control passage inner wall, made the valve clack remain steady movement throughout, and can not produce the incline. When the stop valve is in a closed state, the valve clack can accurately move to a preset plugging position in the valve seat and seal the medium channel, and the sealing effect is good.

3. The utility model discloses a be equipped with the bearing between valve-stem nut and the support, rotatory hand wheel drives valve-stem nut and rotates together, and the torsion that produces between valve-stem nut and the support when rotatory is born by the bearing, has improved valve-stem nut's torsional strength to the dead defect that causes unable normal use of card between valve-stem nut and the support has been avoided, the operational reliability of product has been improved. And simultaneously, the utility model discloses a set screw rod that transversely sets up avoids the valve rod and packs the radial friction within a definite time to valve rod transverse positioning, has prolonged the life of stop valve.

4. The stuffing box and the support of the utility model are in threaded connection, namely the stuffing box and the support are in a split structure, the outer wall of the stuffing box is provided with an external thread, the mounting hole at the lower end of the support is provided with an internal thread, the support and the stuffing box are in threaded connection, the structure is convenient for the disassembly and the assembly of the support, and the stuffing in the stuffing box can be conveniently replaced; besides, the joint of the stuffing box and the valve body is fixed by welding and sealing, so that the external leakage of a medium is avoided, and the overall sealing performance of the valve is enhanced.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,

fig. 1 is a schematic structural view of the pilot-operated stop valve of the present invention;

fig. 2 is a schematic structural view of a valve body of the pilot-operated stop valve of the present invention;

FIG. 3 is a schematic structural view of a valve flap of the pilot operated stop valve of the present invention;

FIG. 4 is a schematic structural diagram of a conventional shut-off valve;

FIG. 5 is a schematic structural diagram of a valve body of a prior art shut-off valve;

fig. 6 is a schematic structural view of a valve flap of a conventional shutoff valve.

Description of reference numerals:

the utility model discloses:

1-a valve body; 2-valve clack; 4-a valve stem; 5-a stuffing box; 6-valve seat; 8-a scaffold;

10-a bearing; 11-valve stem nut; 13-a hand wheel; 14-a media channel;

141-an inlet channel; 142-an outlet channel; 143-inlet end; 144-an outlet end; 15-control channel;

17-slotting 19-guiding the positioning rod; 20-set screws; 21-a dust cover; 22-a delivery line;

31-a valve flap body; 32-a seal; 33-a receiving groove; 34-a backstop ring; 35-a guide ring;

36-an annular groove; 101-a first part of the valve body; 102-a second part of the valve body;

103-the back side of the scoop of the first part of the valve body.

The prior art is as follows:

40-a scaffold; 41-a valve body; 42-a valve flap; 43-lower valve stem; 44-an upper valve stem; 45-hand wheel;

46-a media channel; 461-inlet channel; 462-an outlet channel; 463-an inlet end; 464-an outlet end;

47-control channel; 48-valve stem nut; 49-stuffing box; 50-a valve seat; 51-transfer line.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the pilot-operated stop valve of the present invention; fig. 2 is the structure schematic diagram of the valve body of the pilot-operated stop valve of the present invention. As shown in fig. 1 and 2, the utility model discloses guide's formula stop valve, including valve body 1, valve rod 4, valve clack 2, support 8 and hand wheel 13, valve body 1 includes integrated into one piece's first part 101 and second part 102, be equipped with the medium passageway 14 that link up in the first part 101 of valve body, medium passageway 14 is formed with entrance point 143 and exit end 144 on valve body 1, medium passageway 14 includes inlet channel 141 that is linked together with entrance point 143 and outlet channel 142 that is linked together with exit end 144, dock pipeline 22 respectively at entrance point 143 and exit end 144 punishment, pipeline 22's axis and the axis of entrance point 143 and exit end 144 are coaxial setting. A valve seat 6 is formed at the intersection of the inlet passage 141 and the outlet passage 142; a control channel 15 is arranged in the second part 102 of the valve body, the control channel 15 and the outlet channel 142 are obliquely arranged, the control channel 15 is communicated with the valve seat 6, and the central axis of the valve seat 6 and the central axis of the control channel 15 are coaxially arranged so as to ensure that the valve clack can seal the medium channel 14; the valve rod 4 is inserted in the control channel 15, one end of the valve rod 4 extending into the control channel 15 is connected with the valve clack 2, and the valve clack 2 can be sealed on the valve seat 6 to block the inlet channel 141 and the outlet channel 142. In the present invention, the central axis of the outlet end 144 and the central axis of the outlet passage 142 are coaxially disposed. When the medium flows through outlet channel 142 and carries to exit end 144, the flow direction of medium flow is on a parallel with the axis of exit end 144, and is on a parallel with conveying pipeline 22's axis, therefore, the utility model discloses a structure has overcome that the axis of outlet channel 462 that prior art exists is certain contained angle with the axis of exit end 464, and the medium flow has great impact force (as shown in fig. 5) to conveying pipeline 51's inner wall and easily pierces through conveying pipeline 51 and cause the defect of the leakage of medium, has avoided the impact of medium flow to conveying pipeline, has improved conveying pipeline's security greatly to conveying pipeline's life has been prolonged. And, in the utility model discloses in, the axis of control passage 15 is 55 with the contained angle of exit end 144 axis to guarantee that the medium stream can get into this conveying pipeline 22 along the direction that is on a parallel with conveying pipeline 22's axis. According to the requirement of actual working conditions, the included angle between the central axis of the control channel 15 and the central axis of the outlet end 144 can also be set between 50 degrees and 60 degrees.

In addition, the outlet channel 142 of the medium channel 14 is linear, and the inlet channel 141 is bent. The bent portion of the inlet channel 143 is located at the front end of the junction between the inlet channel 143 and the outlet channel 142, the bent angle of the bent portion may be a right angle or an arc angle, and the bent direction of the bent portion is far away from the junction; in addition, the first part 101 of the valve body is in a spoon head shape, the spoon back side 103 of the spoon head-shaped first part of the valve body is far away from the control channel 15, and the shape corresponds to the bent inlet channel 141, so that the size of the valve body 1 is increased, the medium channel 14 inside the valve body 1 can have enough arrangement space, and the central axis of the outlet channel 142 and the central axis of the outlet end 144 can be ensured to be coaxially arranged.

The utility model discloses in, offer the holding portion of hole enlargement in 1 upper portion of valve body, control channel 15's top, the 5 covers of gland packing are established on valve rod 4, and its one end holding is in this holding portion to with 1 welded seal fixed connection of valve body, can avoid the medium to follow the junction of gland packing 5 and valve body 1 is revealed. Set up the holding chamber on 5 upper portions of gland packing, the diameter in this holding chamber is greater than the diameter of valve rod 4, and valve rod 4 runs through in this holding chamber, loads the filler in the space between this holding chamber and valve rod 4, plays sealing effect, avoids the medium to leak outward through the clearance department between gland packing 5 and the valve rod 4. The lower end of the bracket 8 is in threaded connection with the upper end of the stuffing box 5, so that the bracket is convenient to disassemble and assemble, and the stuffing box is convenient to replace stuffing; the upper end of the support 8 is provided with an inwards concave containing groove, the valve rod nut 11 is arranged in the containing groove, the upper part of the valve rod nut 11 protrudes out of the containing groove and is fixedly connected with the hand wheel 13, and the valve rod nut can be rotatably arranged in the containing groove. The valve rod 4 is in threaded connection with a valve rod nut 11. Be equipped with twice bearing 10 between the storage tank inner wall of valve-stem nut 11 and support 8, bearing 10 can bear the torsion between valve-stem nut 11 and the support 8, with the help of this bearing 10, valve-stem nut 11 can be in the storage tank internal rotation in a flexible way, has also improved valve-stem nut's torsional strength simultaneously to the card is died between valve-stem nut and the support and the defect that causes unable normal use has been avoided, makes the operation of switching valve convenient and fast more.

In the embodiment, the valve-stem nut 11 is made of a copper alloy material, so that the wear resistance of the valve-stem nut 11 is improved. In addition, the upper end of the valve rod 4 is also provided with a dust cover 21, so that dust is prevented from entering the stop valve from a gap at the upper end of the valve rod 4.

Seted up a fluting 17 along the axial on valve rod 4, on the lateral wall of support 8, still seted up along the axis direction of perpendicular to valve rod 4 and link up the through-hole of support lateral wall, a guiding orientation pole 19 wears to locate in this through-hole, and a holding screw 20 is followed the outside of support lateral wall stretches into the through-hole, holding screw 20 and the inner wall threaded connection of through-hole, the front end and the 19 one end apical grafting of guiding orientation pole of holding screw 20 promote the other end of guiding orientation pole 19 to extend to the bottom of fluting 17 to support and lean on in the grooved bottom. Because the end of the guide positioning rod 19 is abutted against the bottom of the groove, the valve rod 4 can be prevented from radially shaking, so that the radial positioning effect on the valve rod 4 is realized, the radial friction between the valve rod 4 and the packing box 5 in the movement process is reduced, and the sealing effect of the packing is enhanced. When the valve rod 4 moves up and down, the guide positioning rod 19 plays a role of guiding, so that the valve rod 4 can move up and down smoothly. The axial length of the slot 17 is larger than the maximum stroke of the valve rod 4, so that the guide positioning rod 19 does not block the lifting movement of the valve rod 4 in the lifting process of the valve rod 4.

Fig. 3 is the structure diagram of the valve clack of the pilot-operated stop valve of the utility model. As shown in fig. 3, the valve flap 2 includes a cylindrical valve flap body 31, a conical sealing portion 32 is disposed at one end of the valve flap body 31, an inward concave accommodating groove 33 is disposed at one end of the valve flap body 31 away from the sealing portion 32, an annular groove 36 is disposed on an inner wall of the accommodating groove 33, a retaining ring 34 is installed in the annular groove 36, an outer diameter of the retaining ring 34 is larger than a diameter of the inner wall of the accommodating groove 33, but smaller than the outer diameter of the annular groove 36, the retaining ring 34 can rotate in the annular groove 36, and is restricted by the annular groove 36, and cannot be separated from the annular groove 36. Guide rings 35 protruding outward in the radial direction are respectively provided on the outer wall of the valve flap body 31, and the guide rings 35 are provided at the upper and lower ends of the outer wall of the valve flap body 31. Referring to fig. 1 again, the front end of the valve rod 4 extends into the containing groove 33 of the valve flap 2, and the retaining ring 34 is engaged with the groove at the front end of the valve rod 4, so as to connect the valve rod 4 and the valve flap 2. Under hand wheel 13's drive, make valve rod 4 remove along control passage 15, it removes together to drive valve clack 2 simultaneously, because the utility model discloses a valve clack 2's outside is protruding to be equipped with two guide rings 35, compare with the known art and reduced the area of contact of valve clack 2 with control passage 15 inner wall, make valve clack and control passage's cooperation inseparable, sealing performance between them has been improved, simultaneously when valve clack 2 slides along control passage 15's inner wall, two guide rings 35 keep parallel movement, make valve clack 2 can not produce the incline, the operation stationarity of valve clack 2 has been improved, make valve clack 2 can be accurate remove predetermined sealing position in disk seat 6. Therefore, the common problem of leakage in the valve body is solved, and the service life of the valve clack is prolonged.

When the valve rod is used, the hand wheel 13 is driven to rotate by external force, the hand wheel 13 drives the valve rod nut 11 to rotate, the valve rod nut 11 is in threaded connection with the upper end of the valve rod 4, the valve rod 4 can rotate by the rotation of the valve rod nut 11, and the valve rod nut can axially reciprocate in the control channel 15. The valve flap 2 is connected to the end of the valve rod 4 which projects into the control channel 15, the control channel 15 communicates with the junction of the inlet channel 141 and the outlet channel 142, which junction forms the valve seat 6, and as the valve rod 4 moves downwards in the control channel, the valve flap 2 sits on the valve seat 6, closing off the medium channel 14. Reverse rotation of the hand wheel 13 moves the flap 2 away from the valve seat 6 to allow communication between the inlet and

outlet passages

141 and 142, and flow from the inlet end 143 into the valve, through the inlet and

outlet passages

141 and 142, and out of the valve through the outlet end 144 into the transfer line 22. To sum up, the utility model discloses guide's formula stop valve because the axis of exit end 144 and exit channel 142's axis are coaxial setting, when the medium stream flows from exit end 144, its flow direction is parallel with conveying line 22's axis, has avoided because the medium stream to conveying line 22 pipe wall direct impact and the quilt that leads to pierce the phenomenon, has improved conveying line's security greatly.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims

1. A pilot operated stop valve characterized by: the pilot-operated stop valve comprises a valve body, a valve rod, a valve clack, a support penetrating through the valve rod and a hand wheel driving the valve rod to move up and down, wherein the valve body comprises a first part and a second part which are integrally formed; the valve comprises a valve body, a valve rod, a valve clack, a valve rod, a control channel, an outlet channel, a valve rod, a valve clack, a valve rod and a valve rod, wherein the valve rod is inserted into the control channel, the valve rod is connected with the valve clack in an inclined mode, the valve rod is inserted into the control channel, one end, extending into the control channel, of the valve rod is connected with the valve clack, the valve clack can be seated on the valve seat, and.

2. Piloted stop valve as in claim 1, characterized in that: the included angle between the central axis of the control channel and the central axis of the outlet end is 50-60 degrees.

3. Piloted stop valve as in claim 1, characterized in that: the inlet channel is bent, and the outlet channel is linear.

4. Piloted stop valve as in claim 3, characterized in that: the first part of the valve body is in a spoon head shape, and the spoon back side of the spoon head-shaped first part of the valve body is far away from the control channel.

5. Piloted stop valve as in claim 1, characterized in that: the valve clack comprises a cylindrical valve clack body, a conical sealing part is arranged at one end of the valve clack body, an inwards concave accommodating groove is formed in one end, far away from the sealing part, of the valve clack body, an annular groove is formed in the inner wall of the accommodating groove, a retaining ring is arranged in the annular groove, and one end of the valve rod is clamped in the retaining ring; two convex guide rings are arranged on the outer wall of the valve clack body along the radial direction of the cylindrical valve clack body.

6. Piloted stop valve as in claim 1, characterized in that: an expanding containing part is arranged at the upper part of the valve body and above the control channel, a packing box is sleeved on the valve rod, and the lower end of the packing box is contained in the containing part and is fixedly connected with the valve body in a welding and sealing way.

7. The piloted stop valve as in claim 6, wherein: the support is installed on the stuffing box, and the lower end of the support is in threaded connection with the upper portion of the stuffing box.

8. The piloted stop valve as in claim 7, wherein: the upper end of the support is provided with an inwards concave containing groove, the valve rod nut is arranged in the containing groove, the upper part of the valve rod nut protrudes out of the containing groove and is fixedly connected with the hand wheel, the valve rod nut can be rotatably arranged in the containing groove, and the valve rod is in threaded connection with the valve rod nut.

9. The piloted stop valve as in claim 8, wherein: two bearings are arranged between the valve rod nut and the inner wall of the containing groove of the support.

10. Piloted stop valve as in any of claims 1 to 9, characterized in that: the valve rod is axially provided with a notch, the side wall of the support is provided with a through hole penetrating through the side wall along the axis direction perpendicular to the valve rod, a guide positioning rod is arranged in the through hole in a penetrating mode, a set screw is screwed in the through hole, the front end of the set screw abuts against one end of the guide positioning rod, and the other end of the guide positioning rod extends into the notch and abuts against the bottom of the notch.