A self-operated control valve

Abstract

The present invention discloses a self-acting control valve, which includes a valve body, a valve cover, a valve stem, an actuator, a valve core and a valve seat. An inlet flow channel, an outlet flow channel and a flow-through port are provided in the valve body. The valve cover is installed on the upper part of the valve body, and the actuator is installed above the valve cover. The valve stem penetrates through the valve cover and extends into the valve body. One end of the valve stem is connected to the output end of the actuator, and the other end of the valve stem is connected to the valve core. The valve seat is installed on the flow-through port. The valve core includes a metal valve core and a non-metal valve core. The metal valve core is installed at the inner end of the valve stem, and the non-metal valve core is installed at the bottom of the metal valve core. A first annular sealing portion protruding from the lower end surface of the non-metal valve core is provided on the metal valve core, and the first annular sealing portion abuts against the upper end surface of the valve seat. A second annular sealing portion protruding upward and abutting against the lower end surface of the non-metal valve core is also provided on the upper end surface of the valve seat. The present invention not only has the functions of fire prevention, explosion prevention and anti-static electricity, but also has a wide range of adjustable pressure setting values, and is convenient, fast and labor-saving in installation and debugging.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a self-acting control valve with fire prevention, explosion prevention, anti-static function and a large adjustable range. Background Art

[0002] A self-acting control valve is a control valve that does not require additional energy to drive. It integrates measurement, control, and execution functions and uses the energy of the controlled object itself (such as pressure, temperature) to drive its operation. Currently, the existing self-acting control valves have the following disadvantages: 1. The seat and spool sealing materials of conventional self-acting control valves and the piston seals or diaphragms used in the actuator are all non-metallic materials, which are generally not suitable for working conditions where the temperature is above 200°C (such as high-temperature gases, etc.) or for flammable and explosive working conditions; 2. Conventional self-acting control valves do not have anti-static devices and are not suitable for working conditions where static electricity is generated; 3. When the set pressure of the valve needs to be adjusted within a large range, conventional self-acting control valves will have problems such as being unable to adjust, inconvenient adjustment, or unstable commissioning. Summary of the Invention

[0003] The purpose of the present invention is to provide a self-acting control valve, which not only has the functions of fire prevention, explosion prevention, and anti-static, but also has a large adjustable range of pressure setting values, and is convenient, fast, and labor-saving for installation and commissioning.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A self-acting control valve includes a valve body, a valve cover, a valve stem, an actuator, a valve spool, and a valve seat. An inlet flow channel and an outlet flow channel are provided in the valve body, and a flow-through port is provided between the inlet flow channel and the outlet flow channel. The valve cover is installed on the upper part of the valve body, the actuator is installed above the valve cover, the valve stem passes through the valve cover and extends into the valve body. One end of the valve stem is connected to the output end of the actuator, and the other end of the valve stem is connected to the valve spool. The valve seat is installed on the flow-through port and is used to form a sealing fit with the valve spool when the valve is closed. The valve spool includes a metal valve spool and a non-metal valve spool. The metal valve spool is installed at the inner end of the valve stem, the non-metal valve spool is installed at the bottom of the metal valve spool, and a first annular sealing portion protruding from the lower end surface of the non-metal valve spool is provided on the metal valve spool. The first annular sealing portion abuts against the upper end surface of the valve seat, and a second annular sealing portion protruding upward and abutting against the lower end surface of the non-metal valve spool is also provided on the upper end surface of the valve seat.

[0005] By adopting the above technical solution, the valve spool is composed of a metal valve spool and a non-metal valve spool. The non-metal valve spool can meet the requirement of zero leakage of the valve. After the non-metal valve spool fails, the metal valve spool can also play a sealing role. At the same time, the metal valve spool has the functions of fire prevention and explosion prevention.

[0006] The present invention is further configured such that the metal valve core is sleeved on the outer periphery of the valve stem, an installation groove for embedding the non-metal valve core is provided at the lower end of the metal valve core, a limiting ring for limiting the upward stroke of the metal valve core is provided on the outer periphery of the valve stem, a screw portion is provided at the lower end of the valve stem, a flat washer and an elastic washer are sleeved on the outer periphery of the screw portion, and a set screw nut is threadedly connected to the screw portion. When the set screw nut is tightened, the flat washer presses the non-metal valve core tightly in the installation groove.

[0007] By adopting the above technical solution, the positioning and installation of the metal valve core and the non-metal valve core on the valve stem can be realized, and the assembly structure is simple and reliable, and the disassembly and assembly are very convenient. After the non-metal valve core is damaged, it can be replaced very conveniently.

[0008] The present invention is further configured such that the actuator includes a cylinder block, a cylinder head installed at the bottom of the cylinder block, a push rod vertically penetrating the cylinder block and the cylinder head, and a metal bellows assembly installed on the push rod. The upper end of the metal bellows assembly is connected to the push rod, and the lower end of the metal bellows assembly abuts against the inner end face of the cylinder head.

[0009] By adopting the above technical solution, the piston of the actuator adopts a metal bellows, so that the actuator is suitable for occasions with high pressure and high temperature, and at the same time has the functions of fire prevention and explosion protection.

[0010] The present invention is further configured such that the actuator further includes a setting spring, a spring seat, an adjusting disk and a pull rod. The lower end of the pull rod penetrates the cylinder block and is connected to the upper end of the valve stem. The spring seat and the adjusting disk are both arranged on the outer periphery of the pull rod. The setting spring is clamped between the spring seat and the adjusting disk. The upper end of the pull rod is threadedly connected with an adjusting nut. The adjusting nut is arranged above the adjusting disk, and a bearing is arranged between the adjusting nut and the adjusting disk.

[0011] By adopting the above technical solution, installing a setting spring above the actuator can obtain a large adjustable range of pressure setting values, and the installation and debugging are convenient, fast and labor-saving.

[0012] The present invention is further configured to further include a balanced bellows assembly. The balanced bellows assembly includes a flange, a lower positioning ring, a metal bellows, an outer ring and an upper positioning ring. The upper positioning ring and the lower positioning ring are respectively arranged at the upper and lower ends of the metal bellows. The flange is welded to the outer periphery of the lower positioning ring, and the outer edge portion of the flange is clamped between the valve cover and the valve body. The outer ring is welded to the outer periphery of the upper positioning ring, and the inner periphery of the upper positioning ring is welded to the outer periphery of the valve stem.

[0013] By adopting the above technical solution, the balanced bellows assembly plays a role in balancing the pressures before and after the valve. When the pressure difference before and after the valve is large, it can stably control the position of the valve core to obtain a stable set pressure, avoiding large fluctuations in the set pressure, and achieving a more ideal effect in large adjustable ratio pressure regulation.

[0014] The present invention is further configured to further include an anti-static device provided on the valve stem and the valve body. The anti-static device includes an anti-static spring, an anti-static steel ball, a set screw, and a grounding lead. A spring groove is provided on the side of the valve stem. The anti-static spring and the anti-static steel ball are arranged in the spring groove, and the anti-static steel ball abuts against the inner wall of the valve cover under the action of the anti-static spring. One end of the grounding lead is connected to the valve body through the set screw.

[0015] By adopting the above technical solution, the static electricity generated on the valve core can be conducted to the grounding lead through the valve stem, the anti-static spring, the anti-static steel ball, the valve cover, the valve body, and the set screw, preventing the generation of sparks by static electricity in the valve cavity and avoiding safety accidents of the valve.

[0016] The present invention is further configured to that the valve seat is threadedly connected to the flow-through port, and a first limiting flange extending outward in the circumferential direction is provided at the upper end of the valve seat. A first sealing gasket is clamped between the lower end surface of the first limiting flange and the inner wall of the valve body.

[0017] By adopting the above technical solution, the installation method of the valve seat is simple and reliable, and the disassembly and assembly are very convenient, which is beneficial to the pre-assembly and the later maintenance operation.

[0018] The present invention is further configured to further include a flushing device disposed at the bottom of the valve body. The flushing device includes a flushing head, a movable inner core, an operating rod, and a plug. A threaded hole is formed at the bottom of the valve body. The outer periphery of the flushing head is in threaded fit with the threaded hole, and a second limiting flange that abuts against the outer wall of the bottom of the valve body is provided on the outer periphery of the flushing head. A second sealing gasket is clamped between the second limiting flange and the outer wall of the valve body. An activity inner cavity extending axially to the bottom end is provided in the flushing head. The movable inner core is axially movably disposed in the activity inner cavity. The plug is threadedly connected to the lower end outlet of the activity inner cavity corresponding to the flushing head, and a third sealing gasket is clamped between the plug and the lower end of the flushing head. An outlet groove with a cross-sectional area larger than that of the activity inner cavity is provided at the upper end of the activity inner cavity. A flushing channel extending to the upper end of the flushing head is provided at the upper end of the outlet groove. A plurality of outer holes connecting the inlet flow channel and the activity inner cavity are provided on the outer periphery of the flushing head. An inner channel penetrating to the bottom is provided in the movable inner core. A plurality of inner holes communicating with the inner channel are provided on the outer periphery of the movable inner core. And a first sealing ring is respectively provided at positions above and below the inner holes corresponding to the outer periphery of the movable inner core. When the movable inner core axially slides, there is a first position where the inner hole communicates with the outlet groove and a second position where the inner hole communicates with the outer hole. A guide hole is also vertically penetratingly provided on the movable inner core. The operating rod penetrates through the guide hole and is threadedly connected to the outer wall of the movable inner core. First positioning grooves and second positioning grooves for positioning the operating rod are also provided at the upper and lower ends of the guide hole. The operating rod is in interference fit with the guide hole.

[0019] By adopting the above technical solution, the flushing device has two states, one is the flushing state and the other is the sewage discharge state. In the flushing state, the operating rod is pushed upward to drive the movable inner core to move upward to the first position. The inner hole of the movable inner core is disconnected from the outer hole of the flushing head. At the same time, the inner hole of the movable inner core is communicated with the outlet groove in the flushing head. The plug is removed, the joint of the water pipe is screwed on. After water is passed, the high-pressure water sequentially passes through the inner channel, the inner hole, the outlet groove, and the flushing channel and enters the inside of the valve body to flush the inner wall of the valve body. After flushing for a period of time, the water pipe joint is removed, and then the operating rod is pushed downward to drive the movable inner core to move downward to the second position, entering the sewage discharge state. The inner hole of the movable inner core is disconnected from the outlet groove. At the same time, the inner hole of the movable inner core is communicated with the outer hole of the flushing head. The internal sewage is discharged to the outside in sequence from the outer hole, the inner hole, and the inner channel, so as to realize the switching between the two states, which is beneficial to cleaning the inside of the valve body to ensure cleanliness.

[0020] The present invention is further configured to that the flushing channel includes a main flow channel, a confluence cavity, a flaring port, and a plurality of branch flow channels. The flaring port, the confluence cavity, and the main flow channel are arranged in sequence from top to bottom. And the main flow channel is communicated with the outlet groove. One end of the branch flow channel is communicated with the main flow channel, and the other end of the branch flow channel is communicated with the confluence cavity.

[0021] By adopting the above technical solution, the water flow in the main runner is broken up into high-pressure water mist by the impact of the branch runner and ejected, resulting in a better cleaning effect.

[0022] The present invention is further configured such that a first annular collecting groove communicating with the inlet runner is provided on the outer periphery of the flushing head, a plurality of outer holes are provided at the inner end of the first annular collecting groove, a second annular collecting groove is provided on the outer periphery of the movable inner core, and a plurality of inner holes are provided at the inner end of the second annular collecting groove.

[0023] By adopting the above technical solution, it is possible to avoid the situation where the inner holes and the outer holes cannot be smoothly communicated due to misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the whole of Embodiment 1;

[0025] Figure 2 is a schematic structural diagram of the valve core in Embodiment 1;

[0026] Figure 3 is a schematic structural diagram of the actuator in Embodiment 1;

[0027] Figure 4 is a schematic structural diagram of the balanced bellows assembly in Embodiment 1;

[0028] Figure 5 is a schematic structural diagram of the anti-static device on the valve body and the valve stem in Embodiment 1;

[0029] Figure 6 is a schematic structural diagram of the whole of Embodiment 2;

[0030] Figure 7 is a schematic structural diagram of the flushing device in Embodiment 2;

[0031] Figure 8 is a schematic structural diagram of the valve seat in Embodiment 2.

[0032] In the figure: 1, valve body; 2, valve cover; 3, valve stem; 4, actuator; 5, valve core; 6, valve seat; 7, inlet flow channel; 8, outlet flow channel; 9, flow-through port; 10, metal valve core; 11, non-metal valve core; 12, first annular sealing portion; 13, second annular sealing portion; 14, mounting groove; 15, limiting ring; 16, screw portion; 17, flat gasket; 18, elastic washer; 19, set screw; 20, cylinder block; 21, cylinder head; 22, push rod; 23, metal bellows assembly; 24, setting spring; 25, spring seat; 26, adjusting disc; 27, pull rod; 28, adjusting nut; 29, bearing; 30, balanced bellows assembly; 31, flange; 32, lower positioning ring; 33, metal bellows; 34, outer ring; 35, upper positioning ring; 36, anti-static device; 37, anti-static spring; 38, anti-static steel ball; 39, set screw; 40, grounding lead; 41, spring groove; 42, first limiting flange; 43, first sealing gasket; 44, flushing device; 45, flushing head; 46, movable inner core; 47, operating rod; 48, plug; 49, screw hole; 50, second limiting flange; 51, second sealing gasket; 52, movable inner cavity; 53, third sealing gasket; 54, water outlet groove; 55, flushing channel; 56, outer hole; 57, inner channel; 58, inner hole; 59, first sealing ring; 60, guide hole; 61, first positioning groove; 62, second positioning groove; 63, main flow channel; 64, confluence chamber; 65, bell mouth; 66, branch flow channel; 67, first annular confluence groove; 68, second annular confluence groove; 69, fixed seat; 70, movable seat; 71, movable groove; 72, second sealing ring; 73, movable spring; 74, limiting plate; 75, first-through component; 76, guide seat; 77, opening and closing valve core; 78, top block; 79, movable ball; 80, first-through spring; 81, first groove body; 82, second groove body; 83, inlet water flow channel; 84, outlet water flow channel; 85, third limiting flange; 86, fourth sealing gasket; 87, first guide hole; 88, second guide hole; 89, water inlet hole; 90, support washer; 91, first water passing trough; 92, annular groove; 93, second water passing trough; 94, guide groove; 95, positioning recess. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment: As shown in the attached Figures 1 to 8A self-acting control valve shown in the figure includes a valve body 1, a valve cover 2, a valve stem 3, an actuator 4, a valve core 5 and a valve seat 6. An inlet flow channel 7 and an outlet flow channel 8 are provided in the valve body 1. An overflow port 9 is provided between the inlet flow channel 7 and the outlet flow channel 8. The valve cover 2 is installed on the upper part of the valve body 1 through bolts. The actuator 4 is installed above the valve cover 2. The valve stem 3 penetrates through the valve cover 2 and extends into the valve body 1. A packing seal assembly is arranged between the valve stem 3 and the valve cover 2. One end of the valve stem 3 is connected to the output end of the actuator 4, and the other end of the valve stem 3 is connected to the valve core 5. The valve seat 6 is installed on the overflow port 9 and is used to form a sealing fit with the valve core 5 when the valve is closed. The valve core 5 includes a metal valve core 10 and a non-metal valve core 11. The metal valve core 10 is installed at the inner end of the valve stem 3. The non-metal valve core 11 is installed at the bottom of the metal valve core 10. And a first annular sealing portion 12 protruding from the lower end face of the non-metal valve core 11 is provided on the metal valve core 10. The first annular sealing portion 12 abuts against the upper end face of the valve seat 6. A second annular sealing portion 13 protruding upward and abutting against the lower end face of the non-metal valve core 11 is also provided on the upper end face of the valve seat 6. The valve core 5 is composed of the metal valve core 10 and the non-metal valve core 11. The non-metal valve core 11 among them can meet the requirement of zero leakage of the valve. After the non-metal valve core 11 fails, the metal valve core 10 can also play a sealing role. At the same time, the metal valve core 10 has the function of fire and explosion prevention.

[0035] As shown in the Figure 2 accompanying drawings, the metal valve core 10 is sleeved on the outer periphery of the valve stem 3. An installation groove 14 for embedding the non-metal valve core 11 is provided at the lower end of the metal valve core 10. A limit ring 15 for limiting the upward stroke of the metal valve core 10 is arranged on the outer periphery of the valve stem 3. A screw rod portion 16 is provided at the lower end of the valve stem 3. A flat washer 17 and a spring washer 18 are sleeved on the outer periphery of the screw rod portion 16. A set screw nut 19 is threadedly connected to the screw rod portion 16. When the set screw nut 19 is tightened, the flat washer 17 presses the non-metal valve core 11 tightly in the installation groove 14. This design can realize the positioning installation of the metal valve core 10 and the non-metal valve core 11 on the valve stem 3. And the assembly structure is simple and reliable, and the disassembly and assembly are very convenient. After the non-metal valve core 11 is damaged, it can be replaced very conveniently.

[0036] As shown in the Figure 3 accompanying drawings, the actuator 4 includes a cylinder body 20, a cylinder head 21 installed at the bottom of the cylinder body 20, a push rod 22 vertically penetrating through the cylinder body 20 and the cylinder head 21, and a metal bellows assembly 23 installed on the push rod 22. The upper end of the metal bellows assembly 23 is connected to the push rod 22. The lower end of the metal bellows assembly 23 abuts against the inner end face of the cylinder head 21. The lower end of the push rod 22 is connected to the upper end of the valve stem 3. The piston of the actuator 4 adopts a metal bellows 33, making the actuator 4 suitable for occasions with high pressure and high temperature, and at the same time having the function of fire and explosion prevention.

[0037] As shown in the attached Figure 1 figure, the actuator 4 further includes a setting spring 24, a spring seat 25, an adjusting disc 26 and a pull rod 27. The lower end of the pull rod 27 penetrates through the cylinder block 20 and is connected to the upper end of the valve stem 3. The spring seat 25 and the adjusting disc 26 are both arranged on the outer periphery of the pull rod 27. The setting spring 24 is clamped between the spring seat 25 and the adjusting disc 26. The upper end of the pull rod 27 is threadedly connected with an adjusting nut 28. The adjusting nut 28 is arranged on the upper end of the adjusting disc 26, and a bearing 29 is arranged between the adjusting nut 28 and the adjusting disc 26. Installing the setting spring 24 above the actuator 4 can obtain a large adjustable range of pressure setting values, and the installation, debugging are convenient, fast and labor-saving.

[0038] As shown in the attached Figure 4 figure, it further includes a balanced bellows assembly 30. The balanced bellows assembly 30 includes a flange 31, a lower positioning ring 32, a metal bellows 33, an outer ring 34 and an upper positioning ring 35. The upper positioning ring 35 and the lower positioning ring 32 are respectively arranged at the upper and lower ends of the metal bellows 33. The flange 31 is welded to the outer periphery of the lower positioning ring 32, and the outer edge part of the flange 31 is clamped between the valve cover 2 and the valve body 1. The outer ring 34 is welded to the outer periphery of the upper positioning ring 35, and the inner periphery of the upper positioning ring 35 is welded to the outer periphery of the valve stem 3. The balanced bellows assembly 30 plays a role in balancing the pressures before and after the valve. When the pressure difference before and after the valve is large, it can stably control the position of the valve core 5 to obtain a stable setting pressure, avoiding large fluctuations in the setting pressure, and the effect is more ideal during large adjustable ratio pressure regulation.

[0039] As shown in the attached Figure 5 figure, it further includes an anti-static device 36 arranged on the valve stem 3 and the valve body 1. The anti-static device 36 includes an anti-static spring 37, an anti-static steel ball 38, a set screw 39 and a grounding lead 40. A spring groove 41 is provided on the side of the valve stem 3. The anti-static spring 37 and the anti-static steel ball 38 are arranged in the spring groove 41, and the anti-static steel ball 38 abuts against the inner wall of the valve cover 2 under the action of the anti-static spring 37. One end of the grounding lead 40 is connected to the valve body 1 through the set screw 39. The static electricity generated on the valve core 5 can be conducted to the grounding lead 40 through the valve stem 3, the anti-static spring 37, the anti-static steel ball 38, the valve cover 2, the valve body 1 and the set screw 39, preventing static electricity from generating sparks in the valve cavity and avoiding safety accidents of the valve.

[0040] As shown in the attached Figure 2As shown, the valve seat 6 is threadedly connected to the flow-through port 9, and a first limiting flange 42 extending outwardly is provided at the upper end of the valve seat 6. A first gasket 43 is clamped between the lower end surface of the first limiting flange 42 and the inner wall of the valve body 1. The installation method of the valve seat 6 is simple and reliable, and the disassembly and assembly are very convenient, which is conducive to the preliminary assembly and the later maintenance operation.

[0041] Embodiment 2. Further, on the basis of Embodiment 1, a flushing device 44 is added, as shown in the appended Figure 6 and the appended Figure 7As shown, the flushing device 44 is arranged at the bottom of the valve body 1. The flushing device 44 includes a flushing head 45, a movable inner core 46, an operating rod 47 and a plug 48. A screw hole 49 is formed at the bottom of the valve body 1. The outer periphery of the flushing head 45 is in threaded fit with the screw hole 49, and a second limiting flange 50 which abuts against the outer wall of the bottom of the valve body 1 is arranged on the outer periphery of the flushing head 45. A second sealing gasket 51 is clamped between the second limiting flange 50 and the outer wall of the valve body 1. An activity inner cavity 52 extending axially to the bottom end is arranged in the flushing head 45. The movable inner core 46 is axially movably arranged in the activity inner cavity 52. The plug 48 is threadedly connected to the lower end outlet of the activity inner cavity 52 of the flushing head 45, and a third sealing gasket 53 is clamped between the plug 48 and the lower end of the flushing head 45. An outlet groove 54 with a cross-sectional area larger than that of the activity inner cavity 52 is arranged at the upper end of the activity inner cavity 52. A flushing channel 55 extending to the upper end of the flushing head 45 is arranged at the upper end of the outlet groove 54. A plurality of outer holes 56 connecting the inlet flow channel 7 and the activity inner cavity 52 are arranged on the outer periphery of the flushing head 45. An inner channel 57 penetrating through to the bottom is arranged in the movable inner core 46. A plurality of inner holes 58 communicating with the inner channel 57 are arranged on the outer periphery of the movable inner core 46. A first sealing ring 59 is arranged at the positions corresponding to the upper and lower sides of the inner holes 58 on the outer periphery of the movable inner core 46 respectively. When the movable inner core 46 axially slides, it has a first position where the inner hole 58 is communicated with the outlet groove 54 and a second position where the inner hole 58 is communicated with the outer hole 56. A guide hole 60 is also vertically and penetratingly arranged on the movable inner core 46. The operating rod 47 penetrates through the guide hole 60 and is threadedly connected to the outer wall of the movable inner core 46. First positioning grooves 61 and second positioning grooves 62 for positioning the operating rod 47 are also arranged at the upper and lower ends of the guide hole 60. The operating rod 47 is in interference fit with the guide hole 60. The flushing device 44 has two states, one is the flushing state and the other is the sewage draining state. In the flushing state, the operating rod 47 is pushed upward to drive the movable inner core 46 to move upward to the first position. The inner hole 58 of the movable inner core 46 is disconnected from the outer hole 56 of the flushing head 45. At the same time, the inner hole 58 of the movable inner core 46 is communicated with the outlet groove 54 in the flushing head 45. The plug 48 is removed, the joint of the water pipe is screwed on. After water is supplied, the high-pressure water sequentially passes through the inner channel 57, the inner hole 58, the outlet groove 54 and the flushing channel 55 and enters the inside of the valve body 1 to flush the inner wall of the valve body 1. After flushing for a period of time, the water pipe joint is removed, and then the operating rod 47 is pushed downward to drive the movable inner core 46 to move downward to the second position, entering the sewage draining state. The inner hole 58 of the movable inner core 46 is disconnected from the outlet groove 54. At the same time, the inner hole 58 of the movable inner core 46 is communicated with the outer hole 56 of the flushing head 45. The internal sewage is sequentially discharged to the outside from the outer hole 56, the inner hole 58 and the inner channel 57, so as to realize the switching between the two states, which is beneficial to cleaning the inside of the valve body 1 to ensure cleanliness.

[0042] As shown in the attached Figure 6and the attached Figure 7 As shown, the flushing channel 55 includes a main channel 63, a confluence chamber 64, a flaring port 65 and a plurality of branch channels 66. The flaring port 65, the confluence chamber 64 and the main channel 63 are arranged in sequence from top to bottom. And the main channel 63 is communicated with the water outlet groove 54. One end of the branch channel 66 is communicated with the main channel 63, and the other end of the branch channel 66 is communicated with the confluence chamber 64. The end of the branch channel 66 is arranged obliquely to the extending direction of the main channel 63. The water flow in the main channel 63 is broken up into high-pressure water mist by the impact of the branch channel 66 and ejected, and the cleaning effect is better.

[0043] As attached Figure 6 and the attached Figure 7 As shown, a first annular confluence groove 67 communicated with the inlet channel 7 is arranged on the outer periphery of the flushing head 45. A plurality of outer holes 56 are arranged at the inner end of the first annular confluence groove 67. A second annular confluence groove 68 is arranged on the outer periphery of the movable inner core 46. A plurality of inner holes 58 are arranged at the inner end of the second annular confluence groove 68. This design can avoid the failure of the inner hole 58 and the outer hole 56 to be smoothly communicated due to misalignment.

[0044] Furthermore, as attached Figure 6 and the attached Figure 8As shown in the figure, to achieve the function of preventing water hammer, the valve seat 6 adopts the following structure: The valve seat 6 includes a fixed seat 69 and a movable seat 70. The movable seat 70 can be made hollow. An activity groove 71 is provided on the valve seat 6. The movable seat 70 is axially movably arranged in the activity groove 71. A second sealing ring 72 for sealing cooperation with the inner wall of the activity groove 71 is installed on the outer periphery of the movable seat 70. A plurality of activity springs 73 are arranged between the movable seat 70 and the activity groove 71. A circular groove can be provided on the fixed seat 69 for positioning the activity springs 73. The upper end of the fixed seat 69 is connected by screws with a limit plate 74 for limiting the movable seat 70. A plurality of first-pass components 75 are provided on the fixed seat 69. The first-pass component 75 includes a guide seat 76, an opening and closing valve core 77, a top block 78, a movable ball 79 and a first-pass spring 80. A first groove body 81 and a second groove body 82 are successively provided on the inner wall of the activity groove 71. The inner diameter of the first groove body 81 is larger than that of the second groove body 82. A water inlet flow channel 83 communicating with the inlet flow channel 7 is provided at the bottom of the first groove body 81. A water outlet flow channel 84 communicating with the outlet flow channel 8 is provided at the inner end of the second groove body 82. The inner end of the guide seat 76 is threadedly connected in the second groove body 82. And a third limit flange 85 is provided on the outer periphery of the guide seat 76. The third limit flange 85 abuts against the inner end of the first groove body 81. And a fourth sealing gasket 86 is clamped between the third limit flange 85 and the inner end of the first groove body 81. A first guide hole 87 and a second guide hole 88 are successively arranged along the axial direction in the guide seat 76. The diameter of the first guide hole 87 is smaller than that of the second guide hole 88. A plurality of water inlet holes 89 connecting the first guide hole 87 with the first groove body 81 are provided on the guide seat 76. The opening and closing valve core 77 is axially movably arranged in the second guide hole 88. The first-pass spring 80 is arranged in the second groove body 82 and applies a spring force to the opening and closing valve core 77. And a support washer 90 is clamped between the first-pass spring 80 and the opening and closing valve core 77. The top block 78 and the movable ball 79 are arranged in the first guide hole 87. And the opening and closing valve core 77, the top block 78 and the movable ball 79 are successively abutted tightly. A plurality of first water passing grooves 91 extending along the axial direction are provided on the outer periphery of the opening and closing valve core 77. An annular groove 92 is provided in the middle of the top block 78. A plurality of second water passing grooves 93 extending to the annular groove 92 are provided at one end of the top block 78 close to the opening and closing valve core 77. A plurality of guide grooves 94 for guiding the end of the movable ball 79 are provided on the outer periphery of the movable seat 70, and the number of the guide grooves 94 is equivalent to that of the first-pass components 75. A positioning recess 95 for embedding the end of the movable ball 79 is provided at the upper end of the movable ball 79. The depth of the positioning recess 95 is greater than the depth of the guide groove 94.During the up-and-down movement of the movable seat 70, when the end of the movable ball 79 is located within the positioning recess 95, the end of the opening and closing valve core 77 abuts against the inner end of the second guide hole 88, disconnecting the first guide hole 87 from the second guide hole 88. When the end of the movable ball 79 is located in the guide groove 94, the top block 78 pushes the opening and closing valve core 77 open, causing the first guide hole 87 to communicate with the second guide hole 88. The medium in the inlet flow channel 7 sequentially passes through the water inlet flow channel 83, the first tank body 81, the water inlet hole 89, the first guide hole 87, the second guide hole 88, the second tank body 82, and the water outlet flow channel 84 and enters the outlet flow channel 8. That is, when the valve is opened, pressure relief can be preformed through the above steps, thus avoiding the occurrence of water hammer damaging internal components when the valve is directly and instantaneously opened.

Claims

1. A self-operated control valve, comprising a valve body, a valve cover, a valve stem, an actuator, a valve core and a valve seat, wherein the valve body is provided with an inlet flow channel and an outlet flow channel, a flow port is provided between the inlet flow channel and the outlet flow channel, the valve cover is mounted on the upper part of the valve body, the actuator is mounted above the valve cover, the valve stem penetrates the valve cover and extends into the valve body, one end of the valve stem is connected to the output end of the actuator, the other end of the valve stem is connected to the valve core, the valve seat is mounted on the flow port to form a sealing fit with the valve core when the valve is closed; characterized in that: The valve core includes a metal valve core and a non-metal valve core, the metal valve core is installed at the inner end of the valve stem, the non-metal valve core is installed at the bottom of the metal valve core, and the metal valve core is provided with a first annular sealing portion protruding from the lower end surface of the non-metal valve core, the first annular sealing portion is tightly abutted against the upper end surface of the valve seat, and the upper end surface of the valve seat is also provided with a second annular sealing portion protruding upward and tightly abutted against the lower end surface of the non-metal valve core; it also includes a flushing device arranged at the bottom of the valve body, the flushing device includes a flushing head, a movable inner core, an operating rod and a screw plug, the flushing head is threadedly connected to the bottom of the valve body, and a movable inner core extending axially to the bottom end is provided in the flushing head The movable inner core is axially movable in the movable inner cavity, the screw plug is threadedly connected to the lower end of the movable inner cavity, the upper end of the movable inner cavity is provided with a water outlet groove, the upper end of the water outlet groove is provided with a flushing channel extending to the upper end of the flushing head, the outer periphery of the flushing head is provided with a plurality of external holes connecting the inlet flow channel with the movable inner cavity, the movable inner core is provided with an inner channel penetrating to the bottom, the outer periphery of the movable inner core is provided with a plurality of inner holes connected with the inner channel, when the movable inner core slides axially, it has a first position in which the inner hole is connected to the water outlet groove and a second position in which the inner hole is connected to the outer hole, a guide hole is also vertically penetrated on the movable inner core, and the operating rod passes through the guide hole and is connected to the movable inner core.

2. A self-operated control valve according to claim 1, characterized in that: The metal valve core is sleeved on the outer periphery of the valve stem, and the lower end of the metal valve core is provided with a mounting groove for embedding the non-metallic valve core, and the outer periphery of the valve stem is provided with a limit ring for limiting the upper stroke of the metal valve core. The lower end of the valve stem is provided with a screw portion, and the outer periphery of the screw portion is sleeved with a flat washer and an elastic washer, and a locking nut is threadedly connected to the screw portion. When the locking nut is tightened, the flat washer presses the non-metallic valve core into the mounting groove.

3. A self-operated control valve according to claim 1, characterized in that: The actuator includes a cylinder body, a cylinder head installed at the bottom of the cylinder body, a push rod vertically penetrating the cylinder body and the cylinder head, and a metal bellows assembly installed on the push rod, the upper end of the metal bellows assembly is connected to the push rod, and the lower end of the metal bellows assembly is tightly against the inner end surface of the cylinder head.

4. A self-operated control valve according to claim 3, characterized in that: The actuator also includes a setting spring, a spring seat, an adjusting disk and a pull rod. The lower end of the pull rod passes through the cylinder body and is connected to the upper end of the valve stem. The spring seat and the adjusting disk are both arranged on the outer periphery of the pull rod. The setting spring is clamped between the spring seat and the adjusting disk. The upper end of the pull rod is threadedly connected with an adjusting nut, which is arranged on the upper end of the adjusting disk, and a bearing is arranged between the adjusting nut and the adjusting disk.

5. The self-operated control valve according to claim 1, characterized in that: It also includes a balanced bellows assembly, which includes a flange, a lower positioning ring, a metal bellows, an outer ring and an upper positioning ring. The upper positioning ring and the lower positioning ring are respectively arranged at the upper and lower ends of the metal bellows. The flange is welded to the outer periphery of the lower positioning ring, and the outer edge of the flange is clamped between the valve cover and the valve body. The outer ring is welded to the outer periphery of the upper positioning ring, and the inner periphery of the upper positioning ring is welded to the outer periphery of the valve stem.

6. A self-operated control valve according to claim 1, characterized in that: It also includes an anti-static device arranged on the valve stem and the valve body, the anti-static device includes an anti-static spring, an anti-static steel ball, a locking screw and a grounding lead, a spring groove is provided on the side of the valve stem, the anti-static spring and the anti-static steel ball are arranged in the spring groove, and the anti-static steel ball abuts against the inner wall of the valve cover under the action of the anti-static spring, and one end of the grounding lead is connected to the valve body through a locking screw.

7. A self-operated control valve according to claim 1, characterized in that: The valve seat is threadedly connected to the flow port, and the upper end of the valve seat is provided with a first limiting flange extending toward the outer circumference, and a first sealing gasket is sandwiched between the lower end surface of the first limiting flange and the inner wall of the valve body.

8. The self-operated control valve according to claim 1, characterized in that: The outer periphery of the flushing head is provided with a second limiting flange which is tightly abutted against the outer wall of the bottom of the valve body, a second sealing gasket is clamped between the second limiting flange and the outer wall of the valve body, a third sealing gasket is clamped between the screw plug and the lower end of the flushing head, the cross-sectional area of ​​the water outlet groove is larger than the movable inner cavity, a first sealing ring is respectively provided at the upper and lower positions of the outer periphery of the movable inner core corresponding to the inner hole, the operating rod is threadedly connected to the outer wall of the movable inner core, and a first positioning groove and a second positioning groove for positioning the operating rod are also provided at the upper and lower ends of the guide hole, and the operating rod is interference fit with the guide hole.

9. A self-operated control valve according to claim 8, characterized in that: The flushing channel includes a main channel, a confluence chamber, a bell mouth and multiple branch channels, the bell mouth, the confluence chamber and the main channel are arranged in sequence from top to bottom, and the main channel is connected to the water outlet trough, one end of the branch channel is connected to the main channel, and the other end of the branch channel is connected to the confluence chamber.

10. The self-operated control valve according to claim 8, characterized in that: The outer periphery of the flushing head is provided with a first annular confluence groove connected to the inlet flow channel, and multiple outer holes are arranged at the inner end of the first annular confluence groove. The outer periphery of the movable inner core is provided with a second annular confluence groove, and multiple inner holes are arranged at the inner end of the second annular confluence groove.

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