A self-operated control valve

Abstract

The invention discloses 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 an inlet flow channel, an outlet flow channel and a flow port are arranged in the valve body, 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, and the valve seat is mounted on the flow port; the valve core comprises a metal valve core and a non-metal valve core, the metal valve core is mounted on the inner end of the valve stem, the non-metal valve core is mounted on the bottom of the metal valve core, a first annular sealing portion protruding from the lower end face of the non-metal valve core is provided on the metal valve core, the first annular sealing portion is tightly abutted against the upper end face of the valve seat, and the upper end face of the valve seat is also provided with a second annular sealing portion protruding upward and tightly abutting against the lower end face of the non-metal valve core. The invention not only has the functions of fire prevention, explosion prevention and anti-static, but also has a wide range of adjustable pressure setting values, and is convenient, fast and labor-saving to install and debug.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a fireproof, explosion-proof, anti-static and large-adjustable self-operated control valve. Background Art

[0002] The self-operated control valve is a control valve that does not require additional energy to drive. It is a control valve that integrates measurement, control and execution functions and uses the energy of the controlled object itself (such as pressure and temperature) to drive its action. At present, the existing self-operated control valves have the following disadvantages: 1. The valve seat and valve core sealing materials of conventional self-operated control valves and the piston seals or diaphragms used in the actuators are all non-metallic materials. Such materials are generally not suitable for working conditions with temperatures above 200°C (such as high-temperature gases, etc.), nor for flammable and explosive working conditions; 2. Conventional self-operated 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 over a large range, conventional self-operated control valves will be unable to adjust, inconvenient to adjust, or unstable to debug. Summary of the invention

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

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: 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 an inlet flow channel and an outlet flow channel are arranged in the valve body, a flow port is arranged 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 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 core, the valve seat is mounted on the flow port to form a sealing cooperation with the valve core when the valve is closed; the valve core comprises a metal valve core and a non-metallic valve core, the metal valve core is mounted on the inner end of the valve stem, the non-metallic valve core is mounted on 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 face of the non-metallic valve core, the first annular sealing portion is tightly abutted against the upper end face of the valve seat, and the upper end face of the valve seat is also provided with a second annular sealing portion protruding upward and tightly abutting against the lower end face of the non-metallic valve core.

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

[0006] The present invention is further configured as follows: the metal valve core is sleeved on the outer periphery of the valve stem; the lower end of the metal valve core is provided with a mounting groove for embedding the non-metallic valve core; 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; the outer periphery of the screw portion is sleeved with a flat washer and an elastic washer; 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 in the mounting groove.

[0007] By adopting the above technical solution, the metal valve core and the non-metal valve core can be positioned and installed on the valve stem, 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 easily replaced.

[0008] The present invention is further configured such 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.

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

[0010] The present invention is further configured such 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, the adjusting nut is arranged at the upper end of the adjusting disk, and a bearing is arranged between the adjusting nut and the adjusting disk.

[0011] By adopting the above technical solution, a setting spring is installed above the actuator to obtain a pressure setting value with a large adjustable range, and the installation and debugging is convenient, fast and labor-saving.

[0012] The present invention is further configured to include a balanced bellows assembly, which includes a flange, a lower positioning ring, a metal bellows, an outer ring and an upper positioning ring, wherein 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.

[0013] By adopting the above technical solution, the balanced bellows assembly plays a role in balancing the pressure before and after the valve. When the pressure difference before and after the valve is large, the position of the valve core can be smoothly controlled to obtain a stable set pressure, thereby avoiding large fluctuations in the set pressure. The effect is more ideal when adjusting the pressure with a large adjustable ratio.

[0014] The present invention is further configured to include an anti-static device arranged on the valve stem and the valve body, the anti-static device including 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.

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

[0016] The present invention is further configured such 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 periphery, 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.

[0017] By adopting the above technical solution, the installation method of the valve seat is simple and reliable, and the disassembly and assembly is very convenient, which is conducive to the early assembly and later maintenance operations.

[0018] The present invention is further configured to include a flushing device arranged at the bottom of the valve body, the flushing device including a flushing head, a movable inner core, an operating rod and a screw plug, a screw hole is opened at the bottom of the valve body, the outer periphery of the flushing head is threadedly matched with the screw hole, and the outer periphery of the flushing head is provided with a second limiting flange tightly abutted against the outer wall of the bottom of the valve body, a second sealing gasket is sandwiched between the second limiting flange and the outer wall of the valve body, the flushing head is provided with an active inner cavity extending axially to the bottom end, the movable inner core is axially movably arranged in the active inner cavity, the screw plug is threadedly connected to the outlet of the lower end of the active inner cavity corresponding to the flushing head, and a third sealing gasket is sandwiched between the screw plug and the lower end of the flushing head, the upper end of the active inner cavity is provided with a water outlet groove with a cross-sectional area larger than that of the active inner cavity, and the outlet A flushing channel extending to the upper end of the flushing head is provided at the upper end of the water tank, a plurality of external holes connecting the inlet flow channel with the movable inner cavity are provided at 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 connected to the inner channel are provided at the outer periphery of the movable inner core, and a first sealing ring is provided at the upper and lower positions of the outer periphery of the movable inner core corresponding to the inner holes. When the movable inner core slides axially, it has a first position where the inner hole is connected to the water outlet tank and a second position where the inner hole is connected to the outer hole. A guide hole is also vertically penetrated on the movable inner core, the operating rod passes through the guide hole and is threadedly connected to the outer wall of the movable inner core, 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.

[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, and the inner hole of the movable inner core is connected to the water outlet groove in the flushing head. The screw plug is removed, and the joint of the water pipe is screwed on. After the water is turned on, the high-pressure water enters the valve body through the inner channel, the inner hole, the water outlet groove and the flushing channel in turn, and the inner wall of the valve body is flushed. 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, and enter the sewage discharge state. The inner hole of the movable inner core is disconnected from the water outlet groove, and the inner hole of the movable inner core is connected to the outer hole of the flushing head. The internal sewage is discharged from the outer hole, the inner hole, and the inner channel to the outside in turn, thereby realizing the switching of the two states, which is conducive to cleaning the inside of the valve body to ensure cleanliness.

[0020] The present invention is further configured such that the flushing channel includes a main channel, a confluence chamber, a bell mouth and a plurality of 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.

[0021] By adopting the above technical solution, the water flow in the main channel is broken up into high-pressure water mist and sprayed out under the impact of the branch channel, thereby achieving a better cleaning effect.

[0022] The present invention is further configured such that a first annular confluence groove connected to the inlet flow channel 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 confluence groove, and a second annular confluence groove is provided on the outer periphery of the movable inner core, a plurality of inner holes are provided at the inner end of the second annular confluence groove.

[0023] By adopting the above technical solution, it is possible to avoid the inner hole and the outer hole being unable to communicate smoothly due to misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1; Figure 2 Schematic diagram of the structure of the valve core in Embodiment 1; Figure 3 is a schematic diagram of the structure of the actuator in this embodiment 1; Figure 4 Schematic diagram of the structure of the balanced bellows assembly in Embodiment 1; Figure 5 Schematic diagram of the structure of the anti-static device on the valve body and valve stem in this embodiment 1; Figure 6 It is a schematic diagram of the overall structure of Example 2; Figure 7 It is a structural schematic diagram of the flushing device in Example 2; Figure 8 Schematic diagram of the structure of the valve seat in Example 2.

[0025] 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 port; 10. metal valve core; 11. non-metal valve core; 12. first annular sealing part; 13. second annular sealing part; 14. mounting groove; 15. limit ring; 16. screw part; 17. flat washer; 18. elastic washer; 19. set nut; 20. cylinder body; 21. cylinder head; 22. push rod; 23. metal bellows assembly; 24. setting spring; 25. spring seat; 26 , adjusting plate; 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, antistatic device; 37, antistatic spring; 38, antistatic steel ball; 39, set screw; 40, grounding lead; 41, spring slot; 42, first limit flange; 43, first sealing gasket; 44, flushing device; 45, flushing head; 46, movable inner core; 47, operating rod; 48, screw plug; 49, screw hole; 50, second limiting flange; 51, second sealing pad; 52, movable inner cavity; 53, third sealing pad; 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 cavity; 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 Sealing ring; 73, movable spring; 74, limit plate; 75, first-pass assembly; 76, guide seat; 77, opening and closing valve core; 78, top block; 79, movable ball; 80, first-pass spring; 81, first trough body; 82, second trough body; 83, water inlet channel; 84, water outlet channel; 85, third limit flange; 86, fourth sealing gasket; 87, first guide hole; 88, second guide hole; 89, water inlet hole; 90, support washer; 91, first water trough; 92, annular groove; 93, second water trough; 94, guide groove; 95, positioning recess. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: As shown in the attached Figures 1 to 8A self-operated control valve shown in the figure comprises 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 arranged in the valve body 1, and a flow port 9 is arranged 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 by bolts, and the actuator 4 is installed above the valve cover 2. The valve stem 3 penetrates 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 arranged Installed on the flow port 9 to form a sealing match 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 on the inner end of the valve stem 3, the non-metal valve core 11 is installed on the bottom of the metal valve core 10, and the metal valve core 10 is provided with a first annular sealing portion 12 protruding from the lower end face of the non-metal valve core 11, the first annular sealing portion 12 is tightly against the upper end face of the valve seat 6, and the upper end face of the valve seat 6 is also provided with a second annular sealing portion 13 protruding upward and tightly against the lower end face of the non-metal valve core 11. The valve core 5 is composed of a metal valve core 10 and a non-metal valve core 11, wherein the non-metal valve core 11 can achieve the requirement of zero leakage of the valve, and the metal valve core 10 can also play a sealing role after the non-metal valve core 11 fails, and the metal valve core 10 has the function of fireproof and explosion-proof.

[0028] As attached Figure 2 As shown, the metal valve core 10 is sleeved on the outer periphery of the valve stem 3, and the lower end of the metal valve core 10 is provided with a mounting groove 14 for the non-metal valve core 11 to be embedded, and the outer periphery of the valve stem 3 is provided with a limit ring 15 for constituting an upper stroke limit for the metal valve core 10, and the lower end of the valve stem 3 is provided with a screw portion 16, and the outer periphery of the screw portion 16 is sleeved with a flat washer 17 and an elastic washer 18, and a fixing nut 19 is threadedly connected to the screw portion 16. When the fixing nut 19 is tightened, the flat washer 17 presses the non-metal valve core 11 into the mounting groove 14. This design can realize the positioning and 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 easily replaced.

[0029] As attached Figure 3 As shown, 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 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 is tightly against the inner end surface of the cylinder head 21, and 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, so that the actuator 4 is suitable for high pressure and high temperature occasions, and has the functions of fire and explosion prevention.

[0030] As attached Figure 1 As shown, the actuator 4 also includes a setting spring 24, a spring seat 25, an adjusting disk 26 and a pull rod 27. The lower end of the pull rod 27 passes through the cylinder 20 and is connected to the upper end of the valve stem 3. The spring seat 25 and the adjusting disk 26 are both arranged on the outer periphery of the pull rod 27. The setting spring 24 is sandwiched between the spring seat 25 and the adjusting disk 26. The upper end of the pull rod 27 is threadedly connected with an adjusting nut 28, which is arranged on the upper end of the adjusting disk 26, and a bearing 29 is arranged between the adjusting nut 28 and the adjusting disk 26. The setting spring 24 is installed above the actuator 4 to obtain a pressure setting value with a large adjustable range, and the installation and debugging are convenient, fast and labor-saving.

[0031] As attached Figure 4 As shown, it also includes a balanced bellows assembly 30, which 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 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 pressure before and after the valve. When the pressure difference before and after the valve is large, the position of the valve core 5 can be stably controlled to obtain a stable set pressure, avoiding large fluctuations in the set pressure, and the effect is more ideal when the adjustable ratio pressure is adjusted.

[0032] As attached Figure 5 As shown, it also 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, the side of the valve stem 3 is provided with a spring groove 41, 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, and 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 transmitted 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, which prevents the static electricity from generating sparks in the valve cavity and avoids safety accidents of the valve.

[0033] As attached Figure 2As shown, the valve seat 6 is threadedly connected to the flow port 9, and the upper end of the valve seat 6 is provided with a first limiting flange 42 extending toward the periphery, and a first sealing gasket 43 is sandwiched 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 is very convenient, which is conducive to the early assembly and the later maintenance operation.

[0034] Embodiment 2, further, this embodiment is based on embodiment 1, and a flushing device 44 is added, as shown in the attached Figure 6 and attached Figure 7As shown, the flushing device 44 is arranged at the bottom of the valve body 1, and the flushing device 44 includes a flushing head 45, a movable inner core 46, an operating rod 47 and a screw plug 48. A screw hole 49 is opened at the bottom of the valve body 1, and the outer periphery of the flushing head 45 is threadedly matched with the screw hole 49, and the outer periphery of the flushing head 45 is provided with a second limiting flange 50 that is tightly abutted against the outer wall of the bottom of the valve body 1, and a second sealing gasket 51 is sandwiched between the second limiting flange 50 and the outer wall of the valve body 1. The flushing head 45 is provided with an active inner cavity 52 extending axially to the bottom end, and the movable inner core 46 is axially movably arranged in the active inner cavity 52. ​​The screw plug 48 is threadedly connected to the outlet of the lower end of the flushing head 45 corresponding to the active inner cavity 52, and a third sealing gasket 53 is sandwiched between the screw plug 48 and the lower end of the flushing head 45. The upper end of the active inner cavity 52 is provided with a water outlet 54 with a cross-sectional area larger than that of the active inner cavity 52, and the upper end of the water outlet 54 is provided with A flushing channel 55 extending to the upper end of the flushing head 45, the outer periphery of the flushing head 45 is provided with a plurality of outer holes 56 connecting the inlet flow channel 7 with the movable inner cavity 52, the movable inner core 46 is provided with an inner channel 57 extending to the bottom, the outer periphery of the movable inner core 46 is provided with a plurality of inner holes 58 connected with the inner channel 57, and a first sealing ring 59 is respectively provided at the upper and lower positions of the outer periphery of the movable inner core 46 corresponding to the inner hole 58. When the movable inner core 46 slides axially, it has a first position where the inner hole 58 is connected to the water outlet groove 54 and a second position where the inner hole 58 is connected to the outer hole 56. A guide hole 60 is also vertically penetrated on the movable inner core 46. The operating rod 47 passes through the guide hole 60 and is threadedly connected to the outer wall of the movable inner core 46. The upper and lower ends of the guide hole 60 are also provided with a first positioning groove 61 and a second positioning groove 62 for positioning the operating rod 47, and the operating rod 47 and the guide hole 60 are interference fit. The flushing device 44 has two states, one is a flushing state, and the other is a sewage discharge 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, and the inner hole 58 of the movable inner core 46 is connected to the water outlet groove 54 in the flushing head 45, the screw plug 48 is removed, and the joint of the water pipe is screwed on. After water is passed, high-pressure water enters the valve body 1 through the inner channel 57, the inner hole 58, the water outlet groove 54 and the flushing channel 55 in turn 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 to enter the sewage discharge state, the inner hole 58 of the movable inner core 46 is disconnected from the water outlet groove 54, and the inner hole 58 of the movable inner core 46 is connected to the outer hole 56 of the flushing head 45, and the internal sewage is discharged to the outside from the outer hole 56, the inner hole 58 and the inner channel 57 in turn, thereby realizing the switching between the two states, which is conducive to cleaning the inside of the valve body 1 to ensure cleanliness.

[0035] As attached Figure 6and attached Figure 7 As shown, the flushing channel 55 includes a main channel 63, a confluence cavity 64, a bell mouth 65 and a plurality of branch channels 66, wherein the bell mouth 65, the confluence cavity 64 and the main channel 63 are arranged in sequence from top to bottom, and the main channel 63 is connected to the water outlet 54, one end of the branch channel 66 is connected to the main channel 63, and the other end of the branch channel 66 is connected to the confluence cavity 64, and 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 under the impact of the branch channel 66, and the cleaning effect is better.

[0036] As attached Figure 6 and attached Figure 7 As shown, the outer periphery of the flushing head 45 is provided with a first annular confluence groove 67 connected to the inlet flow channel 7, and a plurality of outer holes 56 are provided at the inner end of the first annular confluence groove 67. The outer periphery of the movable inner core 46 is provided with a second annular confluence groove 68, and a plurality of inner holes 58 are provided at the inner end of the second annular confluence groove 68. This design can avoid the failure of smooth communication between the inner hole 58 and the outer hole 56 due to misalignment.

[0037] Furthermore, as attached Figure 6 and attached Figure 8As shown, in order to realize 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, a movable groove 71 is provided on the valve seat 6, the movable seat 70 can be axially movable and is arranged in the movable groove 71, a second sealing ring 72 for forming a sealing match with the inner wall of the movable groove 71 is installed on the outer periphery of the movable seat 70, a plurality of movable springs 73 are arranged between the movable seat 70 and the movable groove 71, a circular groove can be arranged on the fixed seat 69 for positioning the movable spring 73, and a limiting plate 74 for limiting the movable seat 70 is connected to the upper end of the fixed seat 69 by screws; The fixed seat 69 is provided with a plurality of first-pass components 75, the first-pass components 75 including a guide seat 76, an opening and closing valve core 77, a top block 78, an active ball 79 and a first-pass spring 80. The inner wall of the active groove 71 is provided with a first groove body 81 and a second groove body 82 in sequence. The inner diameter of the first groove body 81 is larger than that of the second groove body 82. The bottom of the first groove body 81 is provided with an inlet flow channel 83 connected to the inlet flow channel 7. The inner end of the second groove body 82 is provided with an outlet flow channel 84 connected to the outlet flow channel 8. The inner end of the guide seat 76 is threadedly connected to the second groove body 82, and the outer periphery of the guide seat 76 is provided with a third limiting flange 85, and the third limiting flange 85 is connected to the first limiting flange 83. The inner ends of the groove bodies 81 are abutted, and a fourth sealing gasket 86 is sandwiched between the third limiting flange 85 and the inner end of the first groove body 81. The guide seat 76 is provided with a first guide hole 87 and a second guide hole 88 in sequence along the axial direction. The diameter of the first guide hole 87 is smaller than that of the second guide hole 88. The guide seat 76 is provided with a plurality of water inlet holes 89 that connect the first guide hole 87 with the first groove body 81. 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. A supporting washer 90 is sandwiched between the first pass spring 80 and the opening and closing valve core 77. The top block 78 and the movable The ball 79 is 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 pressed tightly in sequence, the outer periphery of the opening and closing valve core 77 is provided with a plurality of first water passing grooves 91 extending along the axial direction, the middle part of the top block 78 is provided with an annular groove 92, and the end of the top block 78 close to the opening and closing valve core 77 is provided with a plurality of second water passing grooves 93 extending to the annular groove 92, the outer periphery of the movable seat 70 is provided with a plurality of guide grooves 94 for guiding the end of the movable ball 79, which is equivalent to the number of the first-pass component 75, and the upper end of the movable ball 79 is provided with a positioning recess 95 for the end of the movable ball 79 to be embedded, and 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 in the positioning recess 95, the end of the opening and closing valve core 77 is tightly pressed 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, so that the first guide hole 87 and the second guide hole 88 are connected, and the medium of the inlet flow channel 7 enters the outlet flow channel 8 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 in sequence, that is, when the valve is opened, the pressure can be released in advance through the above steps, so as to avoid the situation where the valve is directly opened instantly and water hammer damages the internal components.

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 pressed 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 pressed against the lower end surface of the non-metal valve 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 closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. The closure of the valve body is provided with a second sealing gasket, and the closure of the valve body is provided with a second sealing gasket. There is a flushing channel extending to the upper end of the flushing head, and 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 extending to the bottom, the outer periphery of the movable inner core is provided with a plurality of inner holes connected with the inner channel, and 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, when the movable inner core slides axially, it has a first position where the inner hole is connected to the water outlet groove and a second position where the inner hole is connected to the outer hole, and a guide hole is also vertically penetrated on the movable inner core, the operating rod passes through the guide hole and is threadedly connected to the outer wall of the movable inner core, and the upper and lower ends of the guide hole are also provided with a first positioning groove and a second positioning groove for positioning the operating rod, 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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