Pressure reducing valve

Abstract

The utility model relates to the technical field of valves, and discloses a pressure reducing valve. The pressure reducing valve comprises a valve body, a valve element assembly and a pressure relief assembly. A water inlet runner, a water outlet runner and a first sealing face located between the water inlet runner and the water outlet runner are arranged in the valve body. The valve element assembly comprises a valve rod and a valve element connected to the valve rod, the valve element can seal the first sealing face, and when the water inlet pressure in the water inlet runner is larger than first preset pressure, the valve rod can drive the valve element to move so as to open a channel between the water inlet runner and the water outlet runner; a pressure relief inlet flow channel, a pressure relief outlet flow channel and a second sealing surface located between the pressure relief inlet flow channel and the pressure relief outlet flow channel are formed in the valve rod; the pressure relief assembly comprises a pressure relief sealing piece, the pressure relief sealing piece can seal the second sealing face, and when the water inlet pressure in the water inlet flow channel is larger than second preset pressure, the pressure relief sealing piece moves to open a channel between the pressure relief inlet flow channel and the pressure relief outlet flow channel. The pressure reducing valve can adjust the pressure in the pipeline system in time.

Description

Technical Field

[0001] The utility model relates to the technical field of valve parts, in particular to a pressure reducing valve. Background Art

[0002] In a water supply system, the pressure of the tap water pipe network is usually on the high side and unstable, and the different heights of the floors where residents are located will also cause uneven water supply pressure. As an important pressure regulating device, the pressure reducing valve is widely used in scenarios for controlling fluid pressure. The pressure reducing valve reduces the inlet pressure to a required outlet pressure through adjustment, and relies on the energy of the medium itself to automatically keep the outlet pressure stable.

[0003] The pressure reducing valves in the prior art generally include a valve body and a valve core. An inlet water flow channel, an outlet water flow channel, and a sealing port capable of communicating the inlet water flow channel and the outlet water flow channel are formed in the valve body. The valve core can selectively open and close the sealing port to open or cut off the passage between the inlet water flow channel and the outlet water flow channel. When the water pressure upstream of the inlet water flow channel is relatively large, the valve core can move away from the sealing port to open the sealing port, so that the water in the inlet water flow channel flows to the outlet water flow channel through the sealing port, thus playing a role in pressure relief. However, when a water hammer phenomenon occurs or ice forms between the valve core and the sealing port, the pressure reducing valve cannot be normally opened under a huge impact force, which will not only cause the pressure in the pipeline system to not be effectively regulated, but also cause the pipeline to burst in severe cases, resulting in greater economic losses.

[0004] Therefore, there is an urgent need to propose a pressure reducing valve to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pressure reducing valve, which can avoid the situation that it cannot be opened when a water hammer phenomenon occurs or ice forms between the valve core and the sealing port, so as to timely adjust the pressure in the pipeline system.

[0006] With the above concept, the technical solution adopted by the utility model is as follows:

[0007] A pressure reducing valve, comprising:

[0008] A valve body, which has an inlet water flow channel, an outlet water flow channel, and a first sealing surface located between the inlet water flow channel and the outlet water flow channel;

[0009] The spool assembly includes a valve stem and a spool connected to the valve stem. The spool can contact the first sealing surface to block the passage between the water inlet channel and the water outlet channel. When the water inlet pressure in the water inlet channel is greater than the first preset pressure, the valve stem can drive the spool to move away from the first sealing surface to open the passage between the water inlet channel and the water outlet channel. A pressure relief inlet channel, a pressure relief outlet channel, and a second sealing surface located between the pressure relief inlet channel and the pressure relief outlet channel are formed in the valve stem. The inlet of the pressure relief inlet channel is connected to the water inlet channel, and the outlet of the pressure relief outlet channel is connected to the water outlet channel.

[0010] The pressure relief assembly includes a pressure relief seal. The pressure relief seal can contact the second sealing surface to block the passage between the pressure relief inlet channel and the pressure relief outlet channel. When the water inlet pressure in the water inlet channel is greater than the second preset pressure, the pressure relief seal can move away from the second sealing surface to open the passage between the pressure relief inlet channel and the pressure relief outlet channel.

[0011] Wherein, the first preset pressure is less than or equal to the second preset pressure.

[0012] As a preferred solution of the pressure reducing valve provided by the present utility model, a ring-shaped protrusion is convexly provided on the second sealing surface, and the pressure relief seal can be in tight contact with the ring-shaped protrusion.

[0013] As a preferred solution of the pressure reducing valve provided by the present utility model, a valve stem cavity extending along the axial direction of the valve stem is formed in the valve stem. The valve stem cavity is in the shape of a stepped hole, and the stepped surface of the valve stem cavity forms the second sealing surface.

[0014] A pressure relief inlet is provided on the side wall of the valve stem. The small-diameter section of the valve stem cavity is connected to the pressure relief inlet to form the pressure relief inlet channel. A pressure relief outlet is provided at the bottom of the valve stem. The large-diameter section of the valve stem cavity is connected to the pressure relief outlet to form the pressure relief outlet channel.

[0015] As a preferred solution of the pressure reducing valve provided by the present utility model, the number of the pressure relief inlets is at least two. At least two pressure relief inlets are arranged at intervals along the circumferential direction of the valve stem, and each pressure relief inlet is connected to the small-diameter section of the valve stem cavity.

[0016] As a preferred solution of the pressure reducing valve provided by the present utility model, the pressure relief assembly further includes an elastic member. A limiting member is provided at the bottom of the valve stem. A through hole communicating with the pressure relief outlet channel is formed in the limiting member. The elastic member is arranged in a compressed state between the pressure relief seal and the limiting member.

[0017] As a preferred solution of the pressure reducing valve provided by the utility model, a support portion is provided on the side of the pressure relief seal away from the second sealing surface, and the elastic member is partially sleeved outside the support portion.

[0018] As a preferred solution of the pressure reducing valve provided by the utility model, a pressure relief sealing pad is arranged on the side of the pressure relief sealing member facing the second sealing surface.

[0019] As a preferred solution of the pressure reducing valve provided by the utility model, the valve core comprises:

[0020] A bearing portion, sleeved outside the valve stem;

[0021] The pressing sealing gasket is arranged on a side of the bearing portion facing the first sealing surface, and the pressing sealing gasket can be pressed tightly against the first sealing surface.

[0022] As a preferred solution of the pressure reducing valve provided by the utility model, a limited space is formed on the outer wall of the valve stem, and the bearing portion is limited in the limited space.

[0023] As a preferred solution of the pressure reducing valve provided by the utility model, a first reinforcing rib is arranged on the outer wall of the valve stem; and / or a second reinforcing rib is arranged on the outer wall of the valve core.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides a pressure reducing valve. Under normal circumstances, when the water inlet pressure in the water inlet flow channel is greater than a first preset pressure, the valve stem can drive the valve core to move in a direction away from the first sealing surface to open the passage between the water inlet flow channel and the water outlet flow channel, thereby playing a role in pressure relief; when water hammer occurs or ice forms between the valve core and the first sealing surface, the valve core cannot move in a direction away from the first sealing surface under the push of the fluid in the water inlet flow channel, so that when the water inlet pressure in the water inlet flow channel increases to be greater than a second preset pressure, the fluid in the water inlet flow channel can push the pressure relief seal to move in a direction away from the second sealing surface, thereby opening the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel. At this time, the fluid in the water inlet flow channel can flow out to the water outlet flow channel after passing through the pressure relief inlet flow channel and the pressure relief outlet flow channel in sequence, thereby playing a role in regulating the pressure in the pipeline system and ensuring the normal operation of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a pressure reducing valve provided in an embodiment of the utility model;

[0027] Figure 2 It is a cross-sectional schematic diagram of a pressure reducing valve provided in an embodiment of the utility model;

[0028] Figure 3It is a cross-sectional view schematic diagram of the valve core assembly and the pressure relief assembly provided by the embodiment of the present utility model;

[0029] Figure 4 It is a cross-sectional view schematic diagram of the valve stem provided by the embodiment of the present utility model;

[0030] Figure 5 It is a structural schematic diagram of the valve stem provided by the embodiment of the present utility model;

[0031] Figure 6 It is a cross-sectional view schematic diagram of the valve body provided by the embodiment of the present utility model;

[0032] Figure 7 It is a structural schematic diagram of the valve core assembly provided by the embodiment of the present utility model.

[0033] In the figure:

[0034] 100, valve body; 110, valve main body; 111, water inlet; 112, water outlet; 1101, upper valve cavity; 1102, lower valve cavity; 120, valve seat; 121, first sealing surface;

[0035] 200, valve core assembly; 210, valve stem; 2101, valve stem cavity; 21011, second sealing surface; 21012, annular protrusion; 2102, pressure relief inlet; 2103, pressure relief outlet; 2104, transition channel; 2105, limiting space; 211, first reinforcing rib; 212, upper limiting part; 220, valve core; 221, bearing part; 2211, second reinforcing rib; 2212, second accommodating groove; 222, pressing sealing gasket; 230, limiting part; 231, through hole;

[0036] 300, pressure relief assembly; 310, pressure relief seal; 311, first accommodating groove; 312, supporting part; 320, elastic part; 330, pressure relief sealing gasket;

[0037] 400, driving mechanism. Detailed implementation manners

[0038] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0039] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Figure 1 The structural schematic diagram of the pressure reducing valve provided by this embodiment is shown. Figure 2 The sectional schematic diagram of the pressure reducing valve provided by this embodiment is shown. Figure 3 The sectional schematic diagram of the spool assembly 200 and the pressure relief assembly 300 provided by this embodiment is shown.

[0043] As Figures 1-3As shown in the figure, this embodiment provides a pressure reducing valve, which includes a valve body 100, a valve core assembly 200, and a pressure relief assembly 300. The valve body 100 has a water inlet flow channel, a water outlet flow channel, and a first sealing surface 121 located between the water inlet flow channel and the water outlet flow channel. The valve core assembly 200 includes a valve stem 210 and a valve core 220 connected to the valve stem 210. The valve core 220 can contact the first sealing surface 121 to block the passage between the water inlet flow channel and the water outlet flow channel. When the water inlet pressure in the water inlet flow channel is greater than the first preset pressure, the valve stem 210 can drive the valve core 220 to move away from the first sealing surface 121 to open the passage between the water inlet flow channel and the water outlet flow channel. A pressure relief inlet flow channel, a pressure relief outlet flow channel, and a second sealing surface 21011 located between the pressure relief inlet flow channel and the pressure relief outlet flow channel are formed in the valve stem 210. The inlet of the pressure relief inlet flow channel is communicated with the water inlet flow channel, and the outlet of the pressure relief outlet flow channel is communicated with the water outlet flow channel. The pressure relief assembly 300 includes a pressure relief seal 310. The pressure relief seal 310 can contact the second sealing surface 21011 to block the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel. When the water inlet pressure in the water inlet flow channel is greater than the second preset pressure, the pressure relief seal 310 can move away from the second sealing surface 21011 to open the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel. Wherein, the first preset pressure is less than or equal to the second preset pressure.

[0044] For the pressure reducing valve provided in this embodiment, under normal circumstances, when the water inlet pressure in the water inlet flow channel is greater than the first preset pressure, the valve stem 210 can drive the valve core 220 to move away from the first sealing surface 121 to open the passage between the water inlet flow channel and the water outlet flow channel, thereby playing a role in relieving pressure. When a water hammer phenomenon occurs or the valve core 220 freezes with the first sealing surface 121, the valve core 220 cannot move away from the first sealing surface 121 under the push of the fluid in the water inlet flow channel. Therefore, when the water inlet pressure in the water inlet flow channel rises to be greater than the second preset pressure, the fluid in the water inlet flow channel can push the pressure relief seal 310 to move away from the second sealing surface 21011 to open the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel. At this time, the fluid in the water inlet flow channel can flow out to the water outlet flow channel after passing through the pressure relief inlet flow channel and the pressure relief outlet flow channel in sequence, thereby playing a role in regulating the pressure in the pipeline system and ensuring the normal operation of the pipeline system.

[0045] It should be specifically noted that, in this embodiment, the first preset pressure is approximately 0.02 Mpa, and the second preset pressure is approximately 2 Mpa, that is, the second preset pressure is much greater than the first preset pressure. In the normal working state of this pressure reducing valve, the passage between the pressure relief inlet channel and the pressure relief outlet channel will not be opened. The fluid in the water inlet channel will flow from the gap between the first sealing surface 121 and the valve core 220 to the water outlet channel to achieve the pressure relief of the pipeline system. When a water hammer phenomenon occurs, the inlet water pressure in the water inlet channel suddenly increases, and the valve core 220 cannot be opened in time under a large impact. At this time, the fluid in the water inlet channel can flow to the water outlet channel through the pressure relief inlet channel and the pressure relief outlet channel in sequence to achieve the timely pressure relief of the pipeline system. In addition, the passage between the pressure relief inlet channel and the pressure relief outlet channel will not be opened frequently, which can also extend the service life of the pressure relief component 300 and reduce the maintenance cost of this pressure reducing valve. It can be understood that the specific values of the first preset pressure and the second preset pressure are not limited in this embodiment, and designers can adjust the specific values of the first preset pressure and the second preset pressure according to actual needs.

[0046] Figure 4 Fig. shows a cross-sectional schematic view of the valve stem 210 provided in this embodiment. As Figure 4 and in combination with Figure 3 shown, a valve stem cavity 2101 extending along the axial direction of the valve stem 210 is formed inside the valve stem 210. The valve stem cavity 2101 is in the shape of a stepped hole, and the stepped surface of the valve stem cavity 2101 forms the above-mentioned second sealing surface 21011; a pressure relief inlet 2102 is provided on the side wall of the valve stem 210, and the small-diameter section of the valve stem cavity 2101 is connected to the pressure relief inlet 2102 to form the above-mentioned pressure relief inlet channel; a pressure relief outlet 2103 is provided at the bottom of the valve stem 210, and the large-diameter section of the valve stem cavity 2101 is connected to the pressure relief outlet 2103 to form the above-mentioned pressure relief outlet channel, with a simple structure and convenient processing. In this embodiment, the small-diameter section of the valve stem cavity 2101 is connected to the pressure relief inlet 2102 through a transition channel 2104, and the axial direction of the transition channel 2104 is perpendicular to the axial direction of the valve stem 210. This design is convenient for processing and can ensure that the valve stem 210 has a uniform wall thickness at each position, thereby ensuring the structural strength of the valve stem 210.

[0047] Optionally, a ring-shaped protrusion 21012 protrudes from the second sealing surface 21011, and the pressure relief seal 310 can be in close contact with the ring-shaped protrusion 21012. This design can ensure a relatively reliable seal between the ring-shaped protrusion 21012 and the pressure relief seal 310, and can reduce the contact area between the two, reduce the adsorption force of the pressure relief seal 310, and avoid the situation where the pressure relief seal 310 is adsorbed on the second sealing surface 21011 and cannot be opened in the long-term closed state.

[0048] Figure 5The structural schematic diagram of the valve stem 210 provided in this embodiment is shown. As Figure 5 and in combination with Figure 4 shown, the number of pressure relief inlets 2102 is at least two. At least two pressure relief inlets 2102 are arranged at intervals along the circumferential direction of the valve stem 210, and each pressure relief inlet 2102 is connected to the small-diameter section of the valve stem cavity 2101. When the pressure relief seal 310 moves away from the second sealing surface 21011 to open the passage between the pressure relief inlet passage and the pressure relief outlet passage, the fluid in the water inlet passage can flow into the pressure relief inlet passage from each pressure relief inlet 2102 simultaneously, thereby improving the pressure relief efficiency.

[0049] It can be understood that since the outer diameter dimension of the valve stem 210 is usually small and a valve stem cavity 2101 is also provided therein, the structural strength of the valve stem 210 will be low. To improve the structural strength of the valve stem 210, as Figure 5 shown, a first reinforcing rib 211 is provided on the outer wall of the valve stem 210. In this embodiment, the first reinforcing rib 211 extends along the axial direction of the valve stem 210, and the number of the first reinforcing ribs 211 is multiple. The multiple first reinforcing ribs 211 are arranged at intervals along the circumferential direction of the valve stem 210 to further improve the structural strength of the valve stem 210, extend the service life of the valve stem 210, and ensure its use safety. Of course, in other embodiments, the first reinforcing rib 211 can also be annular, and multiple annular first reinforcing ribs 211 are arranged at intervals along the axial direction of the valve stem 210, which can also achieve the above effects.

[0050] As Figure 2 and Figure 3 shown, the pressure relief assembly 300 further includes an elastic member 320. A limiting member 230 is provided at the bottom of the valve stem 210. A through hole 231 communicating with the pressure relief outlet passage is provided in the limiting member 230. The elastic member 320 is arranged in a compressed state between the pressure relief seal 310 and the limiting member 230, so that the elastic member 320 has a pre-tightening force on the pressure relief seal 310. The pressure relief seal 310 is tightly pressed against the second sealing surface 21011 under the action of the pre-tightening force of the elastic member 320, thereby cutting off the passage between the pressure relief inlet passage and the pressure relief outlet passage; when the water inlet pressure in the water inlet passage is greater than the second preset pressure, the fluid in the water inlet passage can continue to compress the elastic member 320 through the pressure relief seal 310 to open the passage between the pressure relief inlet passage and the pressure relief outlet passage; when the water inlet pressure in the water inlet passage is balanced with the water outlet pressure in the water outlet passage, the pressure relief seal 310 can also move in the direction close to the second sealing surface 21011 under the action of the elastic restoring force of the elastic member 320 to press against the second sealing surface 21011 again. In this embodiment, the elastic member 320 is a first spring, and the elastic force of the spring is large, and it is convenient for processing and assembly, and can reduce the material cost.

[0051] In this embodiment, the limiting member 230 is a limiting bolt with a through hole. The limiting bolt passes through the bottom of the valve stem 210 and is disposed in the valve stem cavity 2101. The screw portion of the limiting bolt abuts against the elastic member 320. Of course, in other embodiments, the limiting member 230 may also be a limiting ring formed by protruding the cavity wall of the valve stem cavity 2101 of the valve stem 210 towards its central axis. The inner ring hole of the limiting ring forms the through hole 231 of the limiting member 230.

[0052] As Figure 3 shown, a support portion 312 is provided on the side of the pressure relief seal 310 facing away from the second sealing surface 21011. The elastic member 320 is partially sleeved outside the support portion 312. By providing the support portion 312, a support effect can be provided for the first spring, and it is ensured that the first spring can only be compressed along its axis direction, avoiding its deviation during the compression or elongation process and affecting the normal use of the entire pressure reducing valve.

[0053] To further ensure the sealing effect between the pressure relief seal 310 and the second sealing surface 21011, in this embodiment, a pressure relief gasket 330 is provided on the side of the pressure relief seal 310 facing the second sealing surface 21011. The pressure relief gasket 330 can be tightly pressed against the second sealing surface 21011 through deformation, so as to ensure that the two can be closely attached to achieve a good sealing effect. Optionally, the pressure relief gasket 330 is a rubber gasket, which has a good sealing effect and a low material cost. Optionally, a first accommodation groove 311 for accommodating the pressure relief gasket 330 is provided on the side of the pressure relief seal 310 facing the second sealing surface 21011 to realize the stable installation of the pressure relief gasket 330 and prevent it from falling off during use. In this embodiment, the pressure relief gasket 330 can be installed in the first accommodation groove 311 by gluing, which is convenient for operation and has a firm connection.

[0054] Figure 6 shows a cross-sectional schematic view of the valve body 100 provided in this embodiment. As Figure 6 and in combination with Figure 2As shown in the figure, the valve body 100 includes a valve main body 110 and a valve seat 120. The valve main body 110 has a water inlet 111, a water outlet 112, and a valve cavity located between the water inlet 111 and the water outlet 112. The valve seat 120 is located in the valve cavity and can divide the valve cavity into an upper valve cavity 1101 and a lower valve cavity 1102. The upper valve cavity 1101 is communicated with the water inlet 111 to form the above-mentioned water inlet flow path, and the lower valve cavity 1102 is communicated with the water outlet 112 to form the above-mentioned water outlet flow path. Among them, the valve seat 120 is a ring-shaped protruding portion protruding from the cavity wall of the valve cavity, and the bottom surface of the ring-shaped protruding portion forms the above-mentioned first sealing surface 121. Under normal circumstances, when the water inlet pressure in the water inlet flow path is greater than the first preset pressure, the fluid in the water inlet flow path can push open the valve core 220 to open the passage between the water inlet flow path and the water outlet flow path, so that the fluid in the water inlet flow path flows to the water outlet flow path through the gap between the valve core 220 and the valve seat 120, thereby playing a role in pressure relief. When the water inlet pressure in the water inlet flow path is balanced with the water outlet pressure in the water outlet flow path, the valve core 220 resets to press against the valve seat 120 again, thereby cutting off the passage between the water inlet flow path and the water outlet flow path.

[0055] Continue as Figures 2-5 As shown in the figure, the valve core 220 includes a bearing portion 221 and a pressing gasket 222. The bearing portion 221 is sleeved outside the valve stem 210. The pressing gasket 222 is arranged on one side of the bearing portion 221 facing the first sealing surface 121, and the pressing gasket 222 can be tightly pressed against the first sealing surface 121. The first sealing surface 121 can be tightly pressed against the first sealing surface 121 through deformation, so as to ensure that the two can be closely attached to achieve a good sealing effect. Optionally, the pressing gasket 222 is a rubber gasket, which has a good sealing effect and a low material cost. Optionally, a second accommodating groove 2212 for accommodating the pressing gasket 222 is arranged on one side of the bearing portion 221 facing the first sealing surface 121 to realize the stable installation of the pressing gasket 222 and prevent it from falling off during use. In this embodiment, the pressing gasket 222 can be installed in the second accommodating groove 2212 by gluing, which is convenient for operation and has a firm connection.

[0056] To ensure the stable installation between the bearing portion 221 and the valve stem 210, a limiting space 2105 is formed on the outer wall of the valve stem 210, and the bearing portion 221 is limited in the limiting space 2105 to prevent the bearing portion 221 from displacing relative to the valve stem 210 and affecting the sealing effect of the valve core 220 on the first sealing surface 121.

[0057] Specifically, in this embodiment, an upper limiting portion 212 protrudes outwardly on the outer wall of the valve stem 210, and the bolt head of the limiting bolt (i.e., the limiting member 230) forms a lower limiting portion. The limiting space 2105 is formed between the upper limiting portion 212 and the lower limiting portion. During actual assembly, the pressing gasket 222 can be first installed in the second accommodating groove 2212 to form the valve core 220. Then, the valve core 220 is sleeved on the valve stem 210 from the bottom of the valve stem 210, and the top of the valve core 220 abuts against the upper limiting portion 212. Finally, the limiting bolt is passed through the bottom of the valve stem 210, and the bolt head of the limiting bolt abuts against the bottom of the valve core 220, thereby realizing the assembly between the valve core 220 and the valve stem 210.

[0058] Of course, in other embodiments, a lower limiting portion can also be additionally provided on the outer wall of the valve stem 210 below the upper limiting portion 212, so that the limiting space 2105 is formed between the upper limiting portion 212 and the lower limiting portion, and the above effects can also be achieved.

[0059] Figure 7 Fig. shows the structural schematic diagram of the valve core assembly 200 provided in this embodiment. As Figure 7 and in combination with Figure 3 shown, second reinforcing ribs 2211 are provided on the outer wall of the valve core 220. Specifically, the second reinforcing ribs 2211 are provided on the bearing portion 221. The second reinforcing ribs 2211 can improve the structural strength of the valve core 220, extend the service life of the valve core 220, and ensure its safety in use. In this embodiment, the second reinforcing ribs 2211 extend along the axial direction of the valve core 220, and the number of the second reinforcing ribs 2211 is multiple. The multiple second reinforcing ribs 2211 are arranged at intervals along the circumferential direction of the valve core 220 to further improve the structural strength of the valve core 220. Of course, in other embodiments, the second reinforcing ribs 2211 can also be annular, and the multiple annular second reinforcing ribs 2211 are arranged at intervals along the axial direction of the valve core 220, and the above effects can also be achieved.

[0060] Continuing as Figure 2 shown, the pressure reducing valve further includes a driving mechanism 400, and the driving mechanism 400 is configured to drive the valve stem 210 to move so as to drive the valve core 220 to reset. Under normal circumstances, when the water inlet pressure in the water inlet flow channel is greater than the first preset pressure, the fluid in the water inlet flow channel can push open the valve core 220 to open the passage between the water inlet flow channel and the water outlet flow channel, so that the fluid in the water inlet flow channel flows to the water outlet flow channel through the gap between the valve core 220 and the first sealing surface 121, thereby playing a role in pressure relief; when the water inlet pressure in the water inlet flow channel is balanced with the water outlet pressure in the water outlet flow channel, the driving mechanism 400 can drive the valve core 220 to reset through the valve stem 210, so that the valve core 220 abuts against the first sealing surface 121 again.

[0061] It should be noted that the specific structure and driving method of the driving mechanism 400 will not be elaborated in this embodiment, and all driving mechanisms that can be applied to the pressure reducing valve in the prior art and drive the valve core assembly 200 to reset are within the protection scope of this embodiment.

[0062] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure reducing valve, characterized in that, Comprising: A valve body (100) having a water inlet flow channel, a water outlet flow channel, and a first sealing surface (121) located between the water inlet flow channel and the water outlet flow channel within the valve body (100); A valve core assembly (200) including a valve stem (210) and a valve core (220) connected to the valve stem (210). The valve core (220) can contact the first sealing surface (121) to block the passage between the water inlet flow channel and the water outlet flow channel. When the water inlet pressure in the water inlet flow channel is greater than a first preset pressure, the valve stem (210) can drive the valve core (220) to move away from the first sealing surface (121) to open the passage between the water inlet flow channel and the water outlet flow channel. A pressure relief inlet flow channel, a pressure relief outlet flow channel, and a second sealing surface (21011) located between the pressure relief inlet flow channel and the pressure relief outlet flow channel are formed within the valve stem (210). The inlet of the pressure relief inlet flow channel is communicated with the water inlet flow channel, and the outlet of the pressure relief outlet flow channel is communicated with the water outlet flow channel; A pressure relief assembly (300) including a pressure relief seal (310). The pressure relief seal (310) can contact the second sealing surface (21011) to block the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel. When the water inlet pressure in the water inlet flow channel is greater than a second preset pressure, the pressure relief seal (310) can move away from the second sealing surface (21011) to open the passage between the pressure relief inlet flow channel and the pressure relief outlet flow channel; Wherein, the first preset pressure is less than or equal to the second preset pressure.

2. The pressure reducing valve according to claim 1, characterized in that A ring-shaped protrusion (21012) protrudes from the second sealing surface (21011), and the pressure relief seal (310) can be in tight contact with the ring-shaped protrusion (21012).

3. The pressure reducing valve according to claim 1, wherein A valve stem cavity (2101) extending along the axial direction of the valve stem (210) is formed within the valve stem (210). The valve stem cavity (2101) is a stepped hole, and the stepped surface of the valve stem cavity (2101) forms the second sealing surface (21011); A pressure relief inlet (2102) is provided on the side wall of the valve stem (210). The small-diameter section of the valve stem cavity (2101) is communicated with the pressure relief inlet (2102) to form the pressure relief inlet flow channel. A pressure relief outlet (2103) is provided at the bottom of the valve stem (210). The large-diameter section of the valve stem cavity (2101) is communicated with the pressure relief outlet (2103) to form the pressure relief outlet flow channel.

4. The pressure reducing valve according to claim 3, characterized in that, The number of the pressure relief inlets (2102) is at least two. At least two pressure relief inlets (2102) are arranged at intervals along the circumferential direction of the valve stem (210), and each pressure relief inlet (2102) is communicated with the small-diameter section of the valve stem cavity (2101).

5. The pressure reducing valve according to claim 1, characterized in that, The pressure relief assembly (300) further includes an elastic member (320). A limiting member (230) is provided at the bottom of the valve stem (210). A through hole (231) communicating with the pressure relief outflow passage is provided in the limiting member (230). The elastic member (320) is arranged in a compressed state between the pressure relief seal (310) and the limiting member (230).

6. The pressure reducing valve according to claim 5, characterized in that, A support portion (312) is provided on a side of the pressure relief seal (310) facing away from the second sealing surface (21011). The elastic member (320) is partially sleeved outside the support portion (312).

7. The pressure reducing valve according to claim 1, wherein A pressure relief gasket (330) is provided on a side of the pressure relief seal (310) facing the second sealing surface (21011).

8. The pressure reducing valve according to claim 1, characterized in that, The valve core (220) includes: a bearing portion (221) sleeved outside the valve stem (210); a pressing gasket (222) provided on a side of the bearing portion (221) facing the first sealing surface (121). The pressing gasket (222) can be pressed tightly against the first sealing surface (121).

9. The pressure reducing valve according to claim 8, characterized in that A limiting space (2105) is formed on the outer wall of the valve stem (210). The bearing portion (221) is limited within the limiting space (2105).

10. The pressure reducing valve according to any one of claims 1 to 9, characterized in that, A first reinforcing rib (211) is provided on the outer wall of the valve stem (210); and / or a second reinforcing rib (2211) is provided on the outer wall of the valve core (220).

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