A valve core and pressure control valve

Abstract

This invention provides a valve core and a pressure control valve, belonging to the field of valve technology. It solves the problems of inconvenient assembly of existing valve cores. The valve core includes a valve core seat with a valve hole. A valve stem passes through the valve hole, and a spring abuts against the top of the valve stem. A protruding mating ring is present on the outer surface of the valve stem. The valve hole includes a sliding section and a fixed section, with the diameter of the fixed section being larger than that of the sliding section. A fixed cylinder is fixedly fitted within the fixed section, and the fixed cylinder can be installed into the fixed section through the top opening of the valve hole. A protruding limiting part is present on the wall of the valve hole, and the mating ring is axially limited between the fixed cylinder and the limiting part. An adjusting hole is present inside the fixed cylinder, and an adjusting element is threaded into the adjusting hole. The top of the spring is inserted into the adjusting hole and abuts against the adjusting element. Both the spring and the adjusting element can be installed into the adjusting hole through the top opening of the adjusting hole. The assembly process of this valve core is convenient and quick.

Description

Technical Field

[0001] This invention belongs to the field of valve technology and relates to a valve core and a pressure control valve. Background Technology

[0002] A control valve is a valve whose opening and closing element is designed to be in any position, either closed or fully open. By activating this element, the cross-sectional area of ​​the passage is changed to regulate flow, pressure, or temperature. Control valves primarily used for pressure control are called pressure control valves. Pressure control valves are installed in hot and cold water systems, mainly at the cold water inlet before or after the water enters the house, to protect downstream system equipment and ensure stable operation.

[0003] Chinese patent documents disclose a pressure reducing valve [Application No.: CN201620879587.2; Publication No.: CN 205896308 U], which includes a valve stem, a valve body having an inlet chamber and an outlet chamber, a valve seat communicating with the inlet chamber and the outlet chamber within the valve body, an inner end of the valve stem passing through the valve seat and having a sealing gasket circumferentially fixed to this inner end, an outer end of the valve stem extending out of the valve body and having a valve cap threadedly connected to the valve body covering the outer end of the valve stem, a spring between the valve cap and the valve stem providing elasticity so that the sealing gasket tends to detach from the valve seat, and an adjustment structure between the valve cap and the valve stem for adjusting the spring force. The adjusting structure includes a positioning screw, a nut, a positioning pin, and a positioning ring. The positioning screw passes through the top of the valve cap and has a radially protruding edge that overlaps the inner side of the valve cap top. The positioning ring is threaded to the valve cap. The positioning pin is parallel to the valve stem and fixed to the positioning ring. The nut is located inside the valve cap and is threaded to the positioning screw. The positioning pin passes through the nut. One end of a spring is fitted onto the positioning screw and abuts against the nut, while the other end abuts against the valve stem. An axial mounting hole is formed at the outer end of the valve stem for the spring to extend into. A guide sleeve located inside the valve cap and fitted around the outer circumference of the valve stem is threaded onto the valve body. A cylindrical filter screen is provided between the guide sleeve and the valve seat. The top of the filter screen is fitted onto the guide sleeve, and the bottom of the filter screen is supported by the valve seat. An adjusting rod coaxially mounted on the valve stem is threaded onto the valve body along the extension of the valve stem's inner axis. The inner end of the adjusting rod abuts against the inner end of the valve stem, and the outer end of the adjusting rod extends out of the valve body. The adjusting rod provides axial limiting for the valve stem.

[0004] The assembly consisting of the valve stem, gasket, seat, guide sleeve, valve cap, spring, locating pin, locating ring, nut, locating screw, and filter screen is called the valve core. When assembling the valve core, first fix the locating pin to the locating ring, then thread the nut onto the locating screw. Next, insert the locating pin into the nut, then install the locating screw and locating ring into the valve cap, with the head of the locating screw protruding from the top of the valve cap. The locating ring is threaded onto the valve cap. Then, fit the filter screen onto the guide sleeve, place the valve seat at the bottom of the filter screen, insert the valve stem into the guide sleeve so that the bottom end of the valve stem extends out of the valve seat, and fix the gasket onto the valve stem. Then, install the valve stem, valve seat, and guide sleeve onto the valve body, and insert the spring into the valve stem's mounting hole. Finally, close the valve cap onto the valve body, with the top of the spring fitted onto the locating screw, and the bottom of the valve cap threadedly connected to the valve body. When the valve core needs to be removed to clean the filter screen, first remove the valve cap from the valve body, then remove the spring, guide sleeve, filter screen, valve seat and valve stem from the valve body. After cleaning, install the spring, guide sleeve, filter screen, valve seat and valve stem into the valve body according to the above assembly steps, and then fix the valve cap on the valve body.

[0005] During valve core assembly, the top of the spring needs to be fitted onto the locating screw and abut against the nut. Rotating the locating screw allows the nut to move axially, adjusting the spring's force. However, because the locating screw is located inside the valve cap and is difficult to observe, and there are significant gaps between the locating ring and the spring, as well as between the locating pin and the spring, the bottom of the locating screw easily abuts against the top of the spring when the valve cap is fitted onto the valve body. This prevents the spring from abutting against the nut, causing the valve's pressure regulation function to fail. To avoid this, a common method is to adjust the installation sequence. First, the spring is fitted onto the locating screw. Then, the valve cap and valve body are assembled so that the bottom of the spring is inserted into the valve stem's mounting hole. Since the spring and locating screw are not fixed, the bottom of the spring needs to be facing upwards to prevent it from falling out. This requires inverting the valve body. However, the valve body is heavy, increasing labor intensity, and inverting the valve body can easily cause the valve stem to slip out, making this difficult to perform effectively in practice. In addition, after removing the valve core from the valve body for filter cleaning, when reinstalling the valve core onto the valve body, it is still necessary to position the positioning screw and spring. Since the valve body has already been installed on the pipeline and cannot be moved, the spring can only be placed in the valve stem mounting hole, and then the valve cap can be put on the valve body. The assembly position between the positioning screw and the spring is still prone to errors, requiring repeated rework and adjustment, which makes valve core assembly inconvenient. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a valve core and a pressure control valve, thereby solving the technical problem of inconvenient assembly of existing valve cores.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A valve core includes a valve core seat with a valve hole. A valve stem passes through the valve hole, and a spring abuts against the top of the valve stem. A protruding mating ring is present on the outer side of the valve stem. The valve hole includes a sliding section that slides with the mating ring. The valve hole further includes a fixed section located above the top of the sliding section, with the diameter of the fixed section being larger than that of the sliding section. A fixed cylinder is fixedly fitted within the fixed section. The fixed cylinder can be installed into the fixed section from the top opening of the valve hole. A protruding limiting portion is present on the wall of the valve hole below the bottom of the sliding section. The mating ring is axially limited between the fixed cylinder and the limiting portion. The fixed cylinder has an adjusting hole, and an adjusting element is threaded into the adjusting hole. The top of the spring is inserted into the adjusting hole and abuts against the adjusting element. Both the spring and the adjusting element can be installed into the adjusting hole from the top opening of the adjusting hole.

[0009] When assembling the valve core, the fixing cylinder, which is fixed to the fixing section, can be installed into the fixing section from the top opening of the valve hole. Since the diameter of the fixing section is larger than that of the sliding section, the fitting ring, which slides with the sliding section, can also be inserted from the top opening of the valve hole and pass through the fixing section. The fitting ring protrudes from the outer side of the valve stem, meaning that the fitting ring is at the point of maximum outer diameter of the valve stem. Therefore, the valve stem can be inserted into the valve hole from the top opening first. After the fitting ring passes through the fixing section, it slides with the sliding end of the valve hole. The fitting ring is blocked by the limiting part, so that the valve stem hangs in the valve hole. Since both the spring and the adjusting component can be installed into the adjusting hole from the top opening, fixing the fixing cylinder into the valve hole of the valve core seat before installing the spring and the adjusting component will not affect their installation. The fixing cylinder can be installed into the fixing hole section from the top opening of the valve hole. Therefore, after inserting the valve stem into the valve hole, the fixing cylinder can be inserted into the valve hole from the top opening, allowing the fixing cylinder to fit and fix the fixing hole section. After the fixing cylinder is fixed, the top of the mating ring is blocked by the fixing cylinder. With the mating ring axially limited by the limiting part and the fixing cylinder, the valve stem cannot fall out of the valve core seat, thus fixing the valve core seat, valve stem, and fixing cylinder together. This also facilitates the subsequent assembly of the spring and the adjusting component. After the fixing sleeve is secured, the spring can be inserted into the adjusting hole from the top opening, so that the bottom end of the spring rests against the top of the valve stem. At this time, the top of the spring is located inside the adjusting hole, and the spring is in a naturally extended state without pressure. Then, the adjusting component is screwed into the adjusting hole from the top opening. The top of the spring naturally rests against the adjusting component. Since the adjusting component is threaded into the adjusting hole, rotating the adjusting component allows it to move axially, thus adjusting the spring pressure. Because the top of the spring naturally rests against the adjusting component during assembly, there is no need for repeated rework due to the spring pressure not being adjustable. Therefore, when assembling the valve core, first insert the valve stem into the valve hole, then fix the fixing sleeve into the valve hole, then insert the spring into the adjusting hole, and finally screw the adjusting component into the adjusting hole. The adjusting component is installed in one go without rework, making the valve core assembly process convenient and quick.

[0010] Furthermore, this valve core structure can be detached from the valve body and assembled into an integrated valve core, which can then be installed onto the valve body, making assembly of the valve core on the valve body convenient. When the valve core needs to be removed from the valve body for cleaning during use, the entire integrated valve core can be disassembled from the valve body for cleaning, and then reinstalled, allowing for quick and easy assembly and disassembly of the valve core on the valve body. Moreover, the integrated assembly of this valve core enables modular production of the valve core in the factory, facilitating assembly of the valve core on the valve body and improving production efficiency.

[0011] In the aforementioned valve core, a stepped surface is provided on the wall of the valve bore between the sliding section and the fixed section, and the bottom end face of the fixed cylinder abuts against the stepped surface. The stepped surface has an axial positioning function, facilitating the positioning and installation of the fixed cylinder within the valve bore, thereby making valve core assembly convenient.

[0012] In the valve core described above, a shoulder is provided on the wall of the adjusting hole, the top of the valve stem is inserted into the adjusting hole and can abut against the shoulder, and a sealing ring is fixed on the outer side of the top of the mating ring, the sealing ring abuts against the wall of the adjusting hole and forms a seal.

[0013] The sealing ring is located at the top of the mating ring and forms a seal with the fixed cylinder. This reduces the resistance when the mating ring is inserted into the sliding hole section, making valve stem installation easier and facilitating valve core assembly. Furthermore, since the valve core seat and the fixed cylinder are separate components, different materials can be used between them. When the coefficient of friction between the valve core seat and the sealing ring is high, while the coefficient of friction between the fixed cylinder and the sealing ring is low, the seal formed by the sealing ring and the fixed cylinder reduces resistance and ensures smoother sliding of the valve stem within the valve hole. This guarantees the sensitivity of the valve core and allows the sealing ring to smoothly form a seal with the fixed cylinder under low resistance during assembly.

[0014] In the aforementioned valve core, the outer surface of the fixed cylinder has a protruding retaining ring, which is threadedly connected to the fixed hole section. A wrench fixing part is provided on the outer surface of the top of the fixed cylinder. The threaded connection between the retaining ring and the fixed hole section reduces the thread length and the resistance when screwing the fixed cylinder into the valve hole, making valve core assembly easier and less strenuous. The wrench fixing part can be a splined structure or a regular hexagonal structure, etc., and the wrench has a corresponding structure for fixing. The wrench fixing part facilitates the use of a wrench to screw the fixed cylinder into the valve hole, thus simplifying valve core assembly.

[0015] In the aforementioned valve core, the valve orifice further includes a flared section located at the top of the valve orifice, the diameter of which is larger than the diameter of the fixed section; or the top of the fixed section penetrates the top surface of the valve core seat. This arrangement ensures that the valve stem and the fixed cylinder can enter the valve orifice through the top opening of the valve orifice, facilitating the installation of the valve stem and the fixed cylinder, thereby making valve core assembly convenient.

[0016] In the aforementioned valve core, the adjusting hole has an internal thread on its wall surface that connects to the adjusting component. One end of the internal thread extends to the top surface of the fixed cylinder. The spring is a cylindrical spring, and its outer diameter is smaller than the inner diameter of the internal thread. This ensures that the spring and adjusting component can be inserted into the adjusting hole through the top opening, facilitating valve core assembly.

[0017] In the valve core described above, a blind hole is provided on the top surface of the valve stem. The diameter of the blind hole is larger than the inner diameter of the internal thread. A first positioning protrusion is provided on the bottom surface of the blind hole. The bottom of the spring is located inside the blind hole and is fitted onto the first positioning protrusion. A second positioning protrusion is provided on the bottom surface of the adjusting member. The top of the spring is fitted onto the second positioning protrusion.

[0018] When installing the spring, insert it into the adjusting hole from the top opening. The bottom of the spring should enter the blind hole and fit onto the first positioning protrusion. Then, place the valve stem against the fixed cylinder, allowing the top of the spring to extend out of the adjusting hole. Next, insert the second positioning protrusion into the top of the spring. Finally, press the adjusting element down on the spring and install it into the adjusting hole. The diameter of the blind hole is larger than the inner diameter of the internal thread, facilitating the insertion of the spring. To prevent the bottom of the spring from failing to fit smoothly onto the first positioning protrusion during installation, a positioning rod can be inserted into the spring. Then, insert the spring and the positioning rod together into the adjusting hole. After the spring is installed, remove the positioning rod. The positioning rod provides positioning, preventing the spring from shifting during installation. The first and second positioning protrusions provide positioning for the spring, stabilizing its position during extension and retraction. This ensures the spring force remains accurate during valve core operation, resulting in stable and accurate valve core operation and preventing noise caused by spring vibration.

[0019] In the valve core described above, a chamfer is provided on the wall surface of the valve hole at the top opening of the fixed hole section. The chamfer serves a guiding function, facilitating the installation of the fixed cylinder into the fixed hole section, thereby making valve core assembly convenient.

[0020] In the aforementioned valve core, a cap is detachably fixed to the top of the valve core seat to seal the top opening of the valve hole. The cap seals the fixing cylinder inside the valve core seat, preventing accidental rotation of the adjusting component and ensuring the stability of the spring force during valve core operation, thus ensuring stable valve core operation.

[0021] In the aforementioned valve core, the valve core seat is integrally formed from PPA material.

[0022] PPA material possesses excellent strength and hardness, as well as good heat resistance, chemical resistance, and crack resistance, ensuring the performance and service life of valve seats. Furthermore, PPA material can be used to integrally mold valve seats in a single process through high-temperature injection molding or die casting, offering advantages such as reduced cost, lighter weight, environmental friendliness, and ease of processing. Additionally, PPA material can be colored, allowing for different colors to be applied to the valve seats to distinguish valves with different pressure ranges and pressure control valves.

[0023] A pressure control valve includes a valve body, wherein a valve cavity is provided within the valve body, characterized in that a valve core as described above is installed in the valve cavity, and a mounting portion is provided on the outer side of the valve core seat, the mounting portion being detachably and fixedly connected to the valve body.

[0024] As described above, when assembling the valve core, first insert the valve stem into the valve hole, then fix the fixing cylinder into the valve hole, then insert the spring into the adjusting hole, and finally screw the adjusting component into the adjusting hole. The adjusting component can be installed once without rework, making the valve core assembly process convenient and quick.

[0025] The valve core can be detached from the valve body and assembled into a single integrated valve core. This integrated valve core is then securely attached to the valve body via a mounting component, facilitating assembly. When the valve core needs to be removed from the valve body for cleaning, it can be completely disassembled for cleaning and then reinstalled, allowing for quick and easy assembly and disassembly. Furthermore, the integrated valve core assembly enables modular production in the factory, simplifying assembly and improving production efficiency.

[0026] In the pressure control valve described above, the valve body has an inlet end, an outlet end, and a pressure relief end. The inlet end is provided with an inlet hole communicating with the valve cavity, the outlet end is provided with an outlet hole communicating with the valve cavity, a ball valve is installed in the inlet hole, the pressure relief end is provided with a pressure relief hole communicating with the outlet hole, and a pressure relief valve is installed on the pressure relief end.

[0027] The pressure control valve is installed in the pipeline through an inlet and an outlet. When the ball valve is opened, water enters the pipeline through the inlet, flows into the valve chamber through the inlet hole, passes through the valve core, and flows out through the outlet hole to the downstream equipment in the pipeline. During normal operation, the flow rate of water through the valve core is restricted, thus creating a pressure reduction effect. Controlling the valve core allows for pressure reduction followed by stable delivery, maintaining a stable flow rate. If the pressure at the outlet is too high, a pressure relief valve can be used to release pressure, ensuring the safety and stability of the downstream equipment. The ball valve at the inlet facilitates system measurement and operation.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The valve core seat has a fixed section in its valve bore, within which a fixed cylinder is fixedly fitted. The fixed cylinder axially limits the valve stem between itself and the limiting part. The fixed cylinder can be installed into the fixed section through the top opening of the valve bore. The fixed cylinder has an adjustment hole; the top of a spring is inserted into the adjustment hole and abuts against an adjusting element. Both the adjusting element and the spring can enter the adjustment hole through the flared end, facilitating valve core assembly and enabling integrated and modular production of the valve core. This also facilitates easy disassembly and assembly of the valve core onto the valve body. The stepped surface provides positioning, facilitating the installation of the fixed cylinder; the flared section ensures the fixed cylinder can enter the valve bore through the top opening. The shoulder limits the valve stem, and the sealing ring abuts against the fixed cylinder to form a seal, reducing frictional resistance and facilitating the installation of the valve stem and fixed cylinder. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of embodiment one of the valve cores;

[0031] Figure 2 This is a perspective view of the valve core seat in Embodiment 1 of this valve core;

[0032] Figure 3 This is a cross-sectional view of the valve core seat in Embodiment 1 of this valve core;

[0033] Figure 4 This is a cross-sectional view of the valve stem in Embodiment 1 of this valve core;

[0034] Figure 5 This is a cross-sectional view of the fixed cylinder in Embodiment 1 of this valve core;

[0035] Figure 6 This is a cross-sectional view of a pressure control valve with this valve core installed.

[0036] In the diagram, 1. Valve core seat; 1a. Valve hole; 1a1. Outlet; 1a2. Connecting section; 1a3. Sliding hole section; 1a4. Fixing hole section; 1a5. Flared section; 1a6. Control surface; 1a7. Limiting part; 1a8. Stepped surface; 1b. Inlet; 1c. Mounting part; 1d. Fixing groove one; 1e. Fixing groove two; 1f. Positioning protrusion; 1g. Rotating fixing part; 2. Filter screen; 3. Valve stem; 3a. Mating ring; 3b. Blind hole; 3d. Positioning protrusion one; 3e. Positioning groove; 3f. Fixing protrusion; 4. Spring; 5. Sealing ring; 6. Seal 8. Locking screw; 9. Fixing cylinder; 9a. Fixing ring; 9b. Wrench fixing part; 9c. Adjusting hole; 9c1. Shoulder; 9c2. First section; 9c3. Second section; 9c4. Internal thread; 10. Adjusting component; 10a. Positioning protrusion two; 10b. Mounting positioning groove; 11. Cover; 11a. Mounting ring; 12. Valve body; 12a. Valve cavity; 12b. Water inlet end; 12c. Water outlet end; 12d. Pressure relief end; 12e. Water inlet hole; 12f. Water outlet hole; 12g. Pressure relief hole; 12h. Mounting port; 13. Ball valve; 14. Pressure relief valve. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] Example 1

[0039] like Figures 1-6As shown, a valve core includes an integrally formed valve core seat 1. The valve core seat 1 is integrally formed from PPA plastic through a high-temperature injection molding process or a die-casting process. Alternatively, the valve core seat 1 can be formed from metal material through machining. A valve hole 1a is provided on the valve core seat 1, penetrating both the top and bottom surfaces of the valve core seat 1, forming an outlet 1a1 at the top surface of the valve core seat 1. An inlet 1b is provided on the outer side of the bottom of the valve core seat 1, communicating with the outlet 1a1. There are two inlets 1b arranged circumferentially, and two connecting posts on the valve core seat 1 separate the two inlets 1b. A filter screen 2 is fixed to the valve core seat 1 at the inlet 1b. An annular mounting portion 1c is provided on the outer side of the valve core seat 1, located above the top of the inlet 1b. The outer surface of the valve core seat 1 is also provided with a recessed fixing groove 1d, a recessed fixing groove 1e, a protruding positioning ring 1f, and a rotating fixing part 1g. O-rings are fixed in both fixing groove 1d and fixing groove 1e. Fixing groove 1d is located above the top of the mounting part 1c, and fixing groove 1e is located below the bottom of the inlet 1b. The positioning ring 1f is located above the top of fixing groove 1d, and the rotating fixing part 1g is located above the positioning ring 1f. The rotating fixing part 1g is provided with six positioning planes evenly distributed circumferentially. The valve core seat 1 is easily installed using a positioning wrench.

[0040] The valve orifice 1a includes an outlet 1a1, a connecting section 1a2, a sliding orifice section 1a3, a fixed orifice section 1a4, and a flared section 1a5 arranged sequentially from the bottom to the top of the valve orifice 1a. Specifically, the connecting section 1a2 is located below the bottom of the sliding orifice section 1a3, the outlet 1a1 is located below the bottom of the connecting section 1a2, the fixed orifice section 1a4 is located above the top of the sliding orifice section 1a3, and the flared section 1a5 is located above the top of the fixed orifice section 1a4. The diameter of the flared section 1a5 is larger than the diameter of the fixed orifice section 1a4, and the diameter of the fixed orifice section 1a4 is larger than the diameter of the sliding orifice section 1a3. The valve hole 1a has a tapered control surface 1a6 between the outlet 1a1 and the connecting section 1a2 on the hole wall surface. The valve hole 1a has a protruding annular limiting part 1a7 between the connecting section 1a2 and the sliding hole section 1a3 on the hole wall surface. The valve hole 1a has a stepped surface 1a8 between the fixed hole section 1a4 and the sliding hole section 1a3 on the hole wall surface. The valve hole 1a has a chamfer at the top opening of the fixed hole section 1a4 on the hole wall surface.

[0041] A valve stem 3 is inserted into the valve hole 1a. The valve stem 3 is rod-shaped and made of metal, such as copper or stainless steel. A spring 4, which is a cylindrical spring, rests against the top of the valve stem 3. A protruding mating ring 3a is provided on the outer surface of the top of the valve stem 3. The mating ring 3a slides with the sliding hole section 1a3, and the bottom end face of the mating ring 3a can rest against the limiting part 1a7. A positioning groove 3e is provided on the outer surface of the top of the mating ring 3a. A sealing ring 5 is fixed in the positioning groove 3e. There are two positioning grooves 3e, which are arranged sequentially along the axial direction. A blind hole 3b is provided on the top surface of the valve stem 3. A protruding positioning protrusion 3d is provided on the bottom surface of the blind hole 3b. The bottom of the spring 4 is located in the blind hole 3b and is fitted on the positioning protrusion 3d. The bottom end face of the spring 4 rests against the bottom surface of the blind hole 3b. The bottom end of the valve stem 3 is inserted into the outlet 1a1 and fixedly connected to a sealing element 6. A flow control gap is formed between the outer surface of the sealing element 6 and the control surface 1a6. The sealing element 6 is annular, with a convex arc surface on its outer surface. The top surface of the sealing element 6 has a first deformation groove, and the bottom surface has a second deformation groove. The first and second deformation grooves enhance the elastic deformation of the sealing element 6. The bottom surface of the valve stem 3 has a protruding fixing post 3f. The sealing element 6 is fitted onto the fixing post 3f, and a locking screw 8 is threaded onto the fixing post 3f. The locking screw 8 presses the sealing element 6 between the valve stem 3 and the locking screw 8. The top surface of the sealing element 6 abuts against the bottom surface of the valve stem 3, and the bottom surface of the sealing element 6 abuts against the locking screw 8. Adjusting the axial position of the locking screw 8 on the fixing post 3f changes the deformation of the sealing element 6.

[0042] A cylindrical fixing cylinder 9 is fixedly fitted inside the fixing hole section 1a4. The bottom end face of the fixing cylinder 9 abuts against the stepped surface 1a8 of the valve core seat 1. The fixing cylinder 9 is made of metal, such as copper or stainless steel. The fixing cylinder 9 can be installed into the fixing hole section 1a4 through the top opening of the valve hole 1a. The fixing cylinder 9 is threaded into the fixing hole section 1a4. The outer side of the middle part of the fixing cylinder 9 has a protruding fixing ring 9a, which is threaded into the fixing hole section 1a4. The diameter of the flared section 1a5 is larger than the outer diameter of the thread of the fixing hole section 1a4. A wrench fixing part 9b is provided on the outer side of the top of the fixing cylinder 9. The wrench fixing part 9b has a hexagonal structure or a spline structure. An adjusting hole 9c is provided inside the fixing cylinder 9. The two ends of the adjusting hole 9c pass through the top and bottom ends of the fixing cylinder 9, respectively. The adjusting hole 9c is coaxially arranged with the blind hole 3b of the valve stem 3. A shoulder 9c1 is provided on the wall of the adjusting hole 9c, dividing the adjusting hole 9c into a first section 9c2 and a second section 9c3. The first section 9c2 is close to the top surface of the fixed cylinder 9, and the second section is close to the bottom surface of the fixed cylinder 9. The top of the mating ring 3a is inserted into the second section 9c3 and abuts against the shoulder 9c1. The mating ring 3a of the valve stem 3 is axially limited between the limiting part 1a7 and the shoulder 9c1. At least one sealing ring 5 on the mating ring 3a abuts against the wall of the second section 9c3 to form a seal. Since the valve core seat 1 is made of PPA material, the coefficient of friction between the sealing ring 5 and the valve core seat 1 is relatively large, while the fixed cylinder 9 is made of metal material, and the coefficient of friction between the sealing ring 5 and the fixed cylinder 9 is relatively small. The sealing ring 5 abuts against the fixed cylinder 9 to form a seal, which can reduce the frictional resistance during assembly and make assembly convenient; at the same time, it can also reduce the frictional resistance when the valve stem 3 slides in the valve core seat 1, ensuring the sensitivity of the valve core during use. The first section 9c2 has an internal thread 9c4 on its hole wall, one end of which extends to the top surface of the fixed cylinder 9. The outer diameter of the spring 4 is smaller than the hole diameter of the first section 9c2, and the diameter of the blind hole 3b is larger than the hole diameter of the first section 9c2. That is, the outer diameter of the spring 4 is smaller than the inner diameter of the internal thread 9c4, and the diameter of the blind hole 3b is larger than the inner diameter of the internal thread 9c4. The top end of the spring 4 is inserted into the first section 9c2 of the adjusting hole 9c, and the spring 4 can be inserted into the adjusting hole 9c from the top opening of the adjusting hole 9c and into the blind hole 3b.

[0043] An adjusting member 10 is internally threaded into the adjusting hole 9c. The outer surface of the adjusting member 10 has an external thread that mates with the internal thread 9c4. The adjusting member 10 can be installed into the adjusting hole 9c from its top opening. The bottom surface of the adjusting member 10 has a protruding positioning post 10a. The top end of the spring 4 is fitted onto the positioning post 10a, and the top surface of the spring 4 abuts against the bottom surface of the adjusting member 10. The top surface of the adjusting member 10 has a mounting positioning groove 10b, which is in the shape of a straight line, a cross, or a hexagonal prism.

[0044] A cap 11 is fixed inside the flared section 1a5. The bottom surface of the cap 11 has a protruding mounting ring 11a, which is inserted into the fixing hole section 1a4 to form a threaded connection. The outer surface of the cap 11 has a sealing groove, in which an O-ring is fixed. The outer surface of the O-ring abuts against the hole wall of the flared section 1a5 to form a seal. The top surface of the cap 11 has a rotating positioning groove 3e, which is in the shape of a straight line, a cross, or a hexagonal prism.

[0045] like Figure 6 As shown, a pressure control valve includes a valve body 12, within which a valve cavity 12a is provided. The valve body 12 has an inlet end 12b, an outlet end 12c, and a pressure relief end 12d. The inlet end 12b has an inlet hole 12e communicating with the valve cavity 12a, and the outlet end 12c has an outlet hole 12f communicating with the valve cavity 12a. A ball valve 13 is installed in the inlet hole 12e. The pressure relief end 12d has a pressure relief hole 12g communicating with the outlet hole 12f, and a pressure relief valve 14 is installed on the pressure relief end 12d. The aforementioned valve core is installed in the valve cavity 12a. The valve body 12 has an installation port 12h communicating with the valve cavity 12a. A shoulder is provided on the wall of the installation port 12h, and the valve core seat 1 is inserted into the valve cavity 12a through the installation port 12h. The mounting portion 1c of the valve core seat 1 is threadedly connected to the wall of the mounting port 12h. The positioning protrusion 1f abuts against the shoulder of the mounting port 12h. The O-ring in the fixing groove 1d abuts against the wall of the mounting port 12h and forms a seal. The O-ring in the fixing groove 1e abuts against the wall of the valve cavity 12a and forms a seal. The water inlet 12e is connected to the water inlet 1b, and the water outlet 12f is connected to the water outlet 1a1.

[0046] The pressure control valve is installed in the pipeline through inlet 12b and outlet 12c. When ball valve 13 is opened, water in the pipeline enters through inlet 12b, flows through inlet hole 12e and into valve core through inlet port 1b, then flows out through flow control gap from outlet port 1a1, and then into outlet hole 12f and flows to the downstream equipment of the pipeline. During normal use, the flow rate of water through valve core is restricted, thereby producing a pressure reduction effect. When the water pressure at inlet 12e changes, an increase in inlet pressure leads to a corresponding increase in outlet pressure 1a1. This increased outlet pressure exceeds the force of spring 4, pushing valve stem 3 towards the top of valve core seat 1. This reduces the flow control gap, thus lowering the outlet pressure. Conversely, a decrease in inlet pressure leads to a decrease in outlet pressure 1a1. This decrease is less than the force of spring 4, causing spring 4 to push valve stem 3 towards the bottom of valve core seat 1. This increases the flow control gap, thus increasing the outlet pressure. This ensures a stable output of water pressure at outlet 12f within a certain range. Valve core control allows for pressure reduction followed by stable delivery, maintaining a stable flow rate. Furthermore, excessive water pressure at outlet 12f can be discharged through pressure relief valve 14, ensuring the safety and stability of downstream equipment.

[0047] When assembling the valve core, first insert the valve stem 3 into the valve hole 1a through the top opening. The mating ring 3a then slides into the sliding hole after passing through the fixed section 1a4, and is blocked by the limiting part 1a7, causing the valve stem 3 to hang inside the valve hole 1a. Next, insert the fixing cylinder 9 into the valve hole 1a through the top opening, so that the fixing cylinder 9 fits and is fixed with the fixed section 1a4. The bottom end of the fixing cylinder 9 abuts against the stepped surface 1a8. Then, insert the spring 4 into the adjusting hole 9c through the top opening, so that the bottom end of the spring 4 is inserted into the blind hole 3b and fitted onto the positioning protrusion 3d. At this point, the top of spring 4 is located inside the adjusting hole 9c, and spring 4 is in a naturally extended state without pressure. Move valve stem 3 towards the top of valve core seat 1, so that the top of spring 4 extends out of adjusting hole 9c. Then, insert the positioning protrusion 10a of adjusting hole 9c into the top of spring 4. After that, screw adjusting member 10 into adjusting hole 9c from the top opening of adjusting hole 9c. The top of spring 4 naturally abuts against the bottom end face of adjusting member 10. Finally, fix the cover 11 into valve hole 1a. Adjusting member 10 is threaded into adjusting hole 9c. By rotating adjusting member 10, adjusting member 10 can be moved axially to adjust the pressure of spring 4. The structure of this valve core allows the valve core assembly process to be carried out according to the above steps. When assembling according to the above steps, the top of spring 4 will naturally abut against adjusting member 10 during the assembly process. This avoids the situation where the pressure of spring 4 cannot be adjusted and rework is required. The assembly process of this valve core is convenient and quick.

[0048] After the valve core is assembled, it forms an integrated valve core. This integrated valve core is then fixedly connected to the valve body 12 via the mounting part 1c, facilitating assembly of the valve core on the valve body 12. When the valve core needs to be removed from the valve body 12 for cleaning during use, the entire integrated valve core can be removed from the valve body 12 for cleaning, and then reinstalled, allowing for quick and easy assembly and disassembly of the valve core on the valve body 12. Furthermore, this integrated valve core assembly enables modular production of the valve core in the factory, facilitating assembly on the valve body 12 and improving production efficiency.

[0049] Example 2

[0050] The fixing structure of the fixing cylinder 9 and the fixing hole section 1a4 differs from that in Embodiment 1, as does the structure of the cover 11; other structures are the same as in Embodiment 1. The fixing cylinder 9 is interference-fitted into the fixing hole section 1a4. A fixing surface is provided on the outer side of the top end of the fixing cylinder 9, and the fixing surface is interference-fitted with the hole wall of the fixing hole section 1a4. A mounting ring 11a is provided on the bottom end face of the outer edge of the cover 11. The mounting ring 11a is fitted onto the outer side of the fixing cylinder 9 and forms a threaded connection. The bottom end face of the cover 11 abuts against the top end face of the fixing cylinder 9, and a sealing gasket is provided between the bottom end face of the cover 11 and the top end face of the fixing cylinder 9.

[0051] Example 3

[0052] The structure of the cap 11 and the top structure of the fixing cylinder 9 are different from those in Embodiment 1, while the other structures are the same as in Embodiment 1. The fixing cylinder 9 does not have a flared section 1a5, and the top of the fixing hole section 1a4 penetrates the top surface of the valve core seat 1. The outer surface of the cap 11 does not have a sealing groove or an O-ring. The mounting ring 11a of the cap 11 is threaded into the fixing hole section 1a4, and the outer edge of the cap 11 abuts against the top surface of the fixing cylinder 9. A sealing gasket is provided between the outer edge of the cap 11 and the top surface of the fixing cylinder 9.

[0053] Example 4

[0054] The structure of the adjusting hole 9c on the fixed cylinder 9 is different from that in Embodiment 1, but the other structures are the same as in Embodiment 1. An enlarged section is provided at the top opening of the adjusting hole 9c. The diameter of the enlarged section is larger than the outer diameter of the internal thread 9c4. The internal thread 9c4 is distributed on all the hole walls of the first section 9c2. The spring 4 and the adjusting member 10 can both be inserted into the first section 9c2 through the enlarged section.

[0055] Example 5

[0056] The structures of the mounting portion 1c, the positioning protrusion 1f, and the fixing groove 1d on the valve core seat 1, as well as the structure of the mounting port 12h on the valve body 12, differ from those in Embodiment 1. Other structures are the same as in Embodiment 1. The positioning protrusion 1f is omitted, and a nut ring is provided on the outer surface of the valve core seat 1. The nut ring is fitted onto the valve body 12 and forms a threaded connection. The fixing groove 1d is located below the bottom of the nut ring, and the O-ring in the fixing groove 1d abuts against the wall of the mounting port 12h and forms a seal.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A valve core, comprising a valve core seat (1), wherein a valve hole (1a) is provided on the valve core seat (1), a valve stem (3) is inserted through the valve hole (1a), a spring (4) is abutted against the top of the valve stem (3), a protruding mating ring (3a) is provided on the outer side of the valve stem (3), and the valve hole (1a) includes a sliding hole section (1a3) that slides with the mating ring (3a), characterized in that, The valve hole (1a) also includes a fixed hole section (1a4) located above the top of the sliding hole section (1a3), and the diameter of the fixed hole section (1a4) is larger than the diameter of the sliding hole section (1a3). A fixed cylinder (9) is fixedly fitted inside the fixed hole section (1a4). The fixed cylinder (9) can be installed into the fixed hole section (1a4) from the top opening of the valve hole (1a). The valve hole (1a) has a protruding limiting part (1a7) on the hole wall below the bottom of the sliding hole section (1a3). The mating ring (3a) is axially limited between the fixed cylinder (9) and the limiting part (1a7). The fixed cylinder (9) has an adjusting hole (9c). An adjusting element (10) is threadedly connected inside the adjusting hole (9c). The spring ( 4) The top of the spring (4) is inserted into the adjusting hole (9c) and abuts against the adjusting member (10). Both the spring (4) and the adjusting member (10) can be installed into the adjusting hole (9c) from the top opening of the adjusting hole (9c). A sealing ring (5) is fixed on the outer side of the top of the mating ring (3a). The top of the valve stem (3) is inserted into the adjusting hole (9c). The bottom end of the fixing cylinder (9) is inserted between the outer side of the top of the valve stem (3) and the hole wall of the fixing hole section (1a4). The sealing ring (5) abuts against the hole wall of the adjusting hole (9c) and forms a seal. A stepped surface (1a8) is provided on the hole wall of the valve hole (1a) between the sliding hole section (1a3) and the fixing hole section (1a4). The fixing cylinder (9) The bottom end face abuts against the stepped surface (1a8). The valve hole (1a) also includes a flared section (1a5) located at the top of the valve hole (1a). The diameter of the flared section (1a5) is larger than the diameter of the fixed hole section (1a4). Alternatively, the top of the fixed hole section (1a4) penetrates the top surface of the valve core seat (1). A shoulder (9c1) is provided on the hole wall of the adjusting hole (9c). The top of the valve stem (3) can abut against the shoulder (9c1). A protruding fixing ring (9a) is provided on the outer side of the fixed cylinder (9). The fixing ring (9a) is threadedly connected to the fixed hole section (1a4). A wrench fixing part (9b) is provided on the outer side of the top of the fixed cylinder (9). A wrench fixing part (9b) is provided on the hole wall of the adjusting hole (9c). The component (10) is connected by an internal thread (9c4), one end of which extends to the top surface of the fixed cylinder (9). The spring (4) is a cylindrical spring, the outer diameter of which is smaller than the inner diameter of the internal thread (9c4). A blind hole (3b) is provided on the top surface of the valve stem (3), the diameter of which is larger than the inner diameter of the internal thread (9c4). A protruding positioning protrusion 1 (3d) is provided on the bottom surface of the blind hole (3b). The bottom of the spring (4) is located in the blind hole (3b) and is fitted on the positioning protrusion 1 (3d). A protruding positioning protrusion 2 (10a) is provided on the bottom surface of the adjusting component (10), and the top of the spring (4) is fitted on the positioning protrusion 2 (10a).

2. The valve core according to claim 1, characterized in that, The valve core seat (1) is integrally formed from PPA material.

3. A pressure control valve, comprising a valve body (12), wherein a valve cavity (12a) is provided within the valve body (12), characterized in that, The valve core as described in claim 1 or 2 is installed in the valve cavity (12a), and the outer side surface of the valve core seat (1) has a mounting part (1c), which is detachably fixedly connected to the valve body (12).

4. The pressure control valve according to claim 3, characterized in that, The valve body (12) has an inlet end (12b), an outlet end (12c) and a pressure relief end (12d). The inlet end (12b) is provided with an inlet hole (12e) communicating with the valve cavity (12a). The outlet end (12c) is provided with an outlet hole (12f) communicating with the valve cavity (12a). A ball valve (13) is installed in the inlet hole (12e). The pressure relief end (12d) is provided with a pressure relief hole (12g) communicating with the outlet hole (12f). A pressure relief valve (14) is installed on the pressure relief end (12d).

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