Emptying valve

Abstract

The utility model discloses an emptying valve which comprises a valve body (1) and a water outlet valve element assembly (2). The exhaust valve is characterized by further comprising an exhaust valve element assembly (4), the exhaust valve element assembly (4) comprises a valve element seat (41), the valve element seat (41) is plugged at an outlet of the water inlet channel (11) or in the backflow channel (14) of the valve body (1), a through hole (411) is formed in the middle of the valve element seat (41) in a penetrating mode, and an overflow groove (412) extending from the through hole (411) to the edge of the valve element seat (41) is formed in the surface of the side facing the water flow direction. An overflowing hole (4121) is formed in the bottom wall of the overflowing groove (412) in a penetrating manner; and the umbrella-shaped valve core (42) comprises a rod part (421) and an elastic umbrella part (422), wherein the rod part (421) can be arranged in the through hole (411) in a sliding and penetrating manner. Compared with the prior art, the blowoff valve is high in technical reliability, low in manufacturing requirement and easy to inspect.

Description

Technical Field

[0001] The utility model relates to the technical field of beverage preparation devices, in particular to an exhaust valve. Background Art

[0002] As a beverage extraction device, the coffee machine mainly includes an extraction part for preparing coffee and a pressurized water supply part for providing hot water to the extraction part. Among them, the extraction part uses high temperature and high pressure extraction to obtain a better brewing effect; the pressurized water supply part mainly includes a water tank assembly, a water pump, a one-way valve and a boiler connected in sequence, and a safety pressure relief channel is also provided between the boiler and the water tank. When preparing coffee, the pressure in the boiler is insufficient, the water pump starts, and water is pumped from the water tank to open the one-way valve and inject into the boiler for heating; when the water pressure in the boiler rises due to heating and exceeds the upper limit of the set value, it flows back to the water tank from the safety pressure relief channel.

[0003] When the water pump is used for the first time or is used again after being out of service for a period of time, the water pump may experience dry pumping, resulting in problems such as failure to pump water and difficulty in expelling air from the main body. Especially when there is pressure in the boiler, the water pump is more likely to be damaged due to failure to pump water for a long time.

[0004] To this end, the Chinese patent "Automatic Pressure Relief Valve for Preventing Empty Pumping" with patent application number CN201410679935.7 discloses an automatic pressure relief valve for preventing empty pumping, which is provided with a valve core seat with an exhaust hole and an exhaust valve core capable of blocking or opening the exhaust hole in the water inlet channel. When the water pump is started for the first time or restarted after being stopped for a period of time, empty pumping will occur if there is air in the pump body. When the water pump is empty pumping, there is no pressure in the water inlet channel, and the exhaust valve core in the water inlet channel opens the exhaust hole under the action of the exhaust valve support spring. At the same time, the one-way valve core is closed under the action of the one-way valve compression spring, that is, the water inlet channel and the water outlet channel are blocked, and the air in the water pump enters the reflux channel through the exhaust hole, and finally the air is discharged to the return water tank through the return pipe joint, and the air is discharged smoothly. When the air is discharged, the water pump is in normal use.

[0005] However, in the above scheme, on the one hand, the spring force requirements of the exhaust valve core are very high in precision and the technical reliability is poor. On the other hand, the manufacturing precision requirements of the exhaust valve core and the valve core seat are very high, inspection is difficult, and the yield is low. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a drain valve with high technical reliability in view of the current status of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a drain valve with low manufacturing requirements and simple inspection.

[0008] The technical solution adopted by the utility model to solve the above-mentioned first and second technical problems is: a drain valve, comprising

[0009] A valve body having a water inlet channel, a water outlet channel and a reflux channel therein, wherein the inlet of the water outlet channel is connected to the water inlet channel through a water outlet hole, and the inlet of the reflux channel is connected to the outlet of the water inlet channel through a vent hole; and

[0010] A water outlet valve core assembly, used for opening and closing the water outlet hole;

[0011] It is characterized in that: it also includes an exhaust valve core component, the exhaust valve core component includes

[0012] A valve core seat, which blocks the outlet of the water inlet channel or the return channel, has a through hole in the middle, and a flow groove extending from the through hole to the edge of the valve core seat on the surface facing the water flow direction, and a flow hole is formed on the bottom wall of the flow groove; and

[0013] The umbrella-shaped valve core comprises a rod portion slidably arranged in the through hole and an elastic umbrella portion;

[0014] When the water inlet pressure of the water inlet channel reaches a first preset pressure, the water outlet valve core assembly opens the water outlet hole, and the umbrella portion of the umbrella-shaped valve core squeezes the flow groove under the action of water flow and is in a first state;

[0015] When the water inlet pressure of the water inlet channel is less than the first preset pressure, the water outlet valve core assembly closes the water outlet hole, and the umbrella portion of the umbrella-shaped valve core releases the squeezing of the flow groove under its own elastic force and is in the second state.

[0016] In order to ensure the stability of the umbrella-shaped valve core in the second state, a limiting protrusion is provided on the peripheral wall of the rod portion, and the limiting protrusion and the umbrella portion are respectively located on both sides of the valve core seat;

[0017] In the second state, only the edge of the umbrella portion abuts against the surface of the valve core seat on the side facing the water flow direction, and the limiting protrusion abuts against the surface of the valve core seat on the side facing away from the water flow direction.

[0018] In order to ensure that the fluid is discharged in time through the flow groove, the flow groove extends along the radial direction of the valve core seat.

[0019] In order to improve compactness, a reflux pipe joint is installed at the outlet of the reflux channel, the valve core seat is sealed in the reflux channel, and the tail end of the rod extends into the inner cavity of the reflux pipe joint.

[0020] In order to facilitate opening and closing of the water outlet, a water outlet pipe joint is installed at the outlet of the water outlet channel;

[0021] The water outlet valve core assembly is installed in the water outlet channel and includes

[0022] The water outlet valve core has a first plug at its head; and

[0023] A first elastic member acts between the water outlet valve core and the water outlet pipe joint so that the first plug always has a tendency to block the water outlet hole;

[0024] When the water inlet pressure of the water inlet channel reaches a first preset pressure, the first plug of the water outlet valve core is separated from the water outlet hole under the action of water flow, so that the water outlet hole is opened;

[0025] When the water inlet pressure of the water inlet channel is less than the first preset pressure, the first plug of the water outlet valve core blocks the water outlet hole under the elastic force of the first elastic member to close the water outlet hole.

[0026] To facilitate the installation of the first elastic member, the tail of the water outlet valve core has a first protruding installation column, and the first elastic member is a compression spring, which is sleeved on the outer periphery of the first installation column, and the two ends of the compression spring respectively abut against the opposite surfaces of the water outlet valve core and the water outlet pipe joint.

[0027] In order to realize the pressure relief protection function, the valve body further has a pressure regulating chamber inside, which is connected to the water outlet channel through the pressure relief hole and is connected to the reflux channel through the reflux hole. The drain valve also includes a pressure relief valve core assembly for opening and closing the pressure relief hole.

[0028] When the water inlet pressure of the water inlet channel reaches a second preset pressure, the pressure relief valve core assembly opens the pressure relief hole;

[0029] When the water inlet pressure of the water inlet channel is less than the second preset pressure, the pressure relief valve core assembly closes the pressure relief hole.

[0030] In order to prevent the exhaust valve core assembly from affecting the pressure relief, the valve core seat is sealed in the reflux channel, the second preset pressure is greater than the first preset pressure, and in the first state, the portion of the flow groove close to the edge of the valve core seat is not squeezed by the umbrella portion of the umbrella-shaped valve core.

[0031] In order to facilitate opening and closing of the pressure relief hole and adjusting the second preset pressure, the pressure regulating chamber has a screw hole at a position facing the pressure relief hole, and an adjusting bolt is threadedly connected to the screw hole;

[0032] The pressure relief valve core assembly is installed in the pressure regulating chamber and includes

[0033] A pressure relief valve core having a second plug at its head; and

[0034] A second elastic member acts between the pressure relief valve core and the adjusting bolt, so that the second plug always has a tendency to block the pressure relief hole;

[0035] When the water inlet pressure of the water inlet channel reaches a second preset pressure, the second plug of the pressure relief valve core is separated from the pressure relief hole under the action of water flow, so that the pressure relief hole is opened;

[0036] When the water inlet pressure of the water inlet channel is less than the first preset pressure, the second plug of the pressure relief valve core blocks the pressure relief hole under the elastic force of the second elastic member to close the pressure relief hole.

[0037] To facilitate the installation of the second elastic member, the tail of the pressure relief valve core has a protruding second mounting column. The second elastic member is a compression spring, which is sleeved on the outer periphery of the second mounting column, and the two ends of the compression spring respectively abut against the opposite surfaces of the pressure relief valve core and the adjusting bolt.

[0038] Compared with the prior art, the advantages of the utility model are: an exhaust valve core assembly is formed by the valve core seat and the umbrella-shaped valve core. When the water pump produces an empty pumping phenomenon, the water inlet pressure of the water inlet channel is less than the first preset pressure, and the umbrella part of the umbrella-shaped valve core releases the squeezing of the flow groove under the action of its own elastic force, and the air in the water pump can be quickly discharged through the flow groove and the flow hole of the valve core seat in sequence. On the one hand, there is no need to set up elastic parts, and the technical reliability is high. On the other hand, the manufacturing precision requirements of the valve core seat and the umbrella-shaped valve core are low, the inspection is simple, and the yield rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment of the drain valve of the utility model in a state where the water inlet pressure of the water inlet channel is less than the first preset pressure;

[0040] Figure 2 for Figure 1 A longitudinal cross-sectional view of (the solid arrow indicates the water flow path, and the dotted arrow indicates the air flow path);

[0041] Figure 3 for Figure 2 A longitudinal sectional view of the exhaust valve core assembly;

[0042] Figure 4 for Figure 2 A three-dimensional exploded schematic diagram of the exhaust valve core assembly;

[0043] Figure 5 for Figure 2 A longitudinal cross-sectional view of the middle drain valve after the water inlet pressure of the water inlet channel reaches a first preset pressure and is less than a second preset pressure (the solid arrow indicates the water flow path);

[0044] Figure 6 for Figure 5 A longitudinal cross-sectional view after the middle drain valve is switched to a water inlet channel where the water inlet pressure reaches a second preset pressure (the solid arrow indicates the water flow path). DETAILED DESCRIPTION

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0046] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0047] like Figures 1 to 6 FIG. 1 is a preferred embodiment of the drain valve of the utility model. The drain valve comprises a valve body 1 , a water outlet valve core assembly 2 , a pressure relief valve core assembly 3 and an exhaust valve core assembly 4 .

[0048] The valve body 1 has a water inlet channel 11 , a water outlet channel 12 , a pressure regulating chamber 13 and a reflux channel 14 inside.

[0049] Specifically, a water outlet hole 111 is opened on the side wall of the water inlet channel 11, and a water inlet pipe joint 112 is installed at the entrance of the water inlet channel 11;

[0050] A pressure relief hole 121 is provided on the side wall of the water outlet channel 12; the inlet of the water outlet channel 12 is connected to the water inlet channel 11 through the water outlet hole 111, and a water outlet pipe joint 122 is installed at the outlet of the water outlet channel 12;

[0051] A reflux hole 131 is provided on the side wall of the pressure regulating chamber 13. The pressure regulating chamber 13 is connected to the water outlet channel 12 through the pressure relief hole 121, and is connected to the reflux channel 14 through the reflux hole 131. The pressure regulating chamber 13 has a screw hole 132 at a position facing the pressure relief hole 121, and an adjusting bolt 133 is threadedly connected to the screw hole 132.

[0052] An exhaust hole 141 is provided on the side wall of the reflux channel 14 , and the inlet of the reflux channel 14 is connected to the outlet of the water inlet channel 11 through the exhaust hole 141 ; a reflux pipe joint 142 is installed at the outlet of the reflux channel 14 .

[0053] The water outlet valve core assembly 2 is installed in the water outlet channel 12 and is used to open and close the water outlet hole 111. In this embodiment, the water outlet valve core assembly 2 includes a water outlet valve core 21 and a first elastic member 22.

[0054] Specifically, the head of the water outlet valve core 21 has a first plug 211; the tail of the water outlet valve core 21 has a first convex mounting column 212;

[0055] The first elastic member 22 is a compression spring, which is sleeved on the outer periphery of the first mounting column 212 , and the two ends of the compression spring are respectively in contact with the opposite surfaces of the water outlet valve core 21 and the water outlet pipe joint 122 , so that the first plug 211 always has a tendency to block the water outlet hole 111 .

[0056] The pressure relief valve core assembly 3 is installed in the pressure regulating chamber 13 and is used to open and close the pressure relief hole 121. In this embodiment, the pressure relief valve core assembly 3 includes a pressure relief valve core 31 and a second elastic member 32.

[0057] Specifically, the head of the pressure relief valve core 31 has a second plug 311; the tail of the pressure relief valve core 31 has a second protruding mounting column 312;

[0058] The second elastic member 32 is a compression spring, which is sleeved on the outer circumference of the second mounting column 312 , and the two ends of the compression spring are respectively abutted against the opposite surfaces of the pressure relief valve core 31 and the adjusting bolt 133 , so that the second plug 311 always has a tendency to block the pressure relief hole 121 .

[0059] The exhaust valve core assembly 4 is installed in the return channel 14 and is used to open and close the return channel 14. In this embodiment, the exhaust valve core assembly 4 includes a valve core seat 41 and an umbrella-shaped valve core 42.

[0060] Specifically, the valve core seat 41 is sealed in the reflux channel 14, a through hole 411 is formed in the middle of the valve core seat 41, and a flow groove 412 is formed on the surface of the valve core seat 41 facing the water flow direction (i.e., the side facing the entrance of the reflux channel 14) and extends radially from the through hole 411 to the edge of the valve core seat 41, and a flow hole 4121 is formed on the bottom wall of the flow groove 412;

[0061] The umbrella-shaped valve core 42 includes a rod portion 421 that can be slidably inserted into the through hole 411 and an elastic umbrella portion 422. A limiting protrusion 4211 is provided on the peripheral wall of the rod portion 421. The limiting protrusion 4211 and the umbrella portion 422 are respectively located on both sides of the valve core seat 41, and the tail end of the rod portion 421 extends into the inner cavity of the return pipe joint 142.

[0062] When the water inlet pressure of the water inlet channel 11 is less than the first preset pressure, Figure 2 As shown, the first plug 211 of the water outlet valve core 21 blocks the water outlet hole 111 under the elastic force of the first elastic member 22, so that the water outlet hole 111 is closed, and the umbrella portion 422 of the umbrella-shaped valve core 42 releases the squeezing of the flow groove 412 under its own elastic force and is in the second state. At this time, only the edge of the umbrella portion 422 abuts against the surface of the valve core seat 41 facing the water flow direction (i.e., the side facing the inlet of the reflux channel 14), and the limiting protrusion 4211 abuts against the surface of the valve core seat 41 facing away from the water flow direction (i.e., the side facing the outlet of the reflux channel 14);

[0063] When the water inlet pressure of the water inlet channel 11 reaches the first preset pressure, Figure 5 and Figure 6 As shown, the first plug 211 of the water outlet valve core 21 is separated from the water outlet hole 111 under the action of the water flow, so that the water outlet hole 111 is opened, and the umbrella portion 422 of the umbrella-shaped valve core 42 squeezes the flow groove 412 under the action of the water flow and is in the first state. At this time, the portion of the flow groove 412 close to the edge of the valve core seat 41 is not squeezed by the umbrella portion 422 of the umbrella-shaped valve core 42, and only a small amount of water is allowed to pass through; wherein, when the water inlet pressure of the water inlet channel 11 is less than the second preset pressure (the second preset pressure is greater than the first preset pressure), as shown in FIG. Figure 5 As shown, the second plug 311 of the pressure relief valve core 31 blocks the pressure relief hole 121 under the elastic force of the second elastic member 32, so that the pressure relief hole 121 is closed; when the water inlet pressure of the water inlet channel 11 reaches the second preset pressure, as shown in FIG. Figure 6 As shown, the second plug 311 of the pressure relief valve core 31 is separated from the pressure relief hole 121 under the action of water flow, so that the pressure relief hole 121 is opened.

[0064] The working principle of this embodiment is as follows:

[0065] Before use, connect the water inlet pipe joint 112 to the water pump, connect the water outlet pipe joint 122 to the boiler, and connect the return pipe joint 142 to the return water tank;

[0066] (1) Water discharge working process: When the water pump is in normal working state, high-pressure water enters the water inlet channel 11. At this time, the water inlet pressure of the water inlet channel 11 reaches the first preset pressure and is less than the second preset pressure. Under the pressure of the high-pressure water, Figure 5As shown, the first plug 211 of the outlet valve core 21 is separated from the outlet hole 111 under the action of the water flow, so that the outlet hole 111 is opened. At the same time, the umbrella portion 422 of the umbrella-shaped valve core 42 squeezes the flow groove 412 under the action of the water flow and is in the first state (at this time, the portion of the flow groove 412 close to the edge of the valve core seat 41 is not squeezed by the umbrella portion 422 of the umbrella-shaped valve core 42, and only a small amount of water is allowed to pass through to achieve slight leakage). Therefore, most of the high-pressure water enters the outlet channel 12 from the water inlet channel 11 through the outlet hole 111, and is finally discharged to the boiler through the outlet pipe joint 122; in addition, when the water pump stops working, the pressure continues to decrease due to slight leakage, and the umbrella-shaped valve core 42 rebounds to the initial state, and can be emptied again in the next working cycle;

[0067] (2) Exhaust working process: When the water pump is used for the first time or is used again after being stopped for a period of time, the water pump will produce an empty pumping phenomenon. At this time, the water inlet pressure of the water inlet channel 11 is relatively small, and the water inlet pressure is less than the first preset pressure, such as Figure 2 As shown, the first plug 211 of the water outlet valve core 21 blocks the water outlet hole 111 under the elastic force of the first elastic member 22, so that the water outlet hole 111 is closed. At the same time, the umbrella portion 422 of the umbrella-shaped valve core 42 releases the squeezing of the flow groove 412 under its own elastic force and is in the second state. The air in the water pump enters the entrance of the return channel 14 from the water inlet channel 11 through the exhaust hole 141, and quickly enters the outlet of the return channel 14 through the flow groove 412 and the flow hole 4121 of the valve core seat 41 in sequence, and finally discharges the air to the return water tank through the return pipe joint 142. The air is discharged smoothly. When the air is discharged, the water pump returns to the normal working state.

[0068] (3) Pressure relief protection process: When the coffee machine pipeline is abnormal, high pressure is formed in the valve body 1. At this time, the water inlet pressure of the water inlet channel 11 is relatively large, and the water inlet pressure is greater than the second preset pressure, such as Figure 6 As shown, the second plug 311 of the pressure relief valve core 31 is separated from the pressure relief hole 121 under the action of water flow, so that the pressure relief hole 121 is opened, and the high-pressure water flow or air pressure will enter the pressure regulating chamber 13 and then enter the entrance of the return channel 14 through the return hole 131, and slowly enter the outlet of the return channel 14 through the flow groove 412 and the flow hole 4121 of the valve core seat 41 in turn, and finally discharge the high-pressure water flow or air pressure to the return water tank through the return pipe joint 142, and the pressure relief is completed.

Claims

1. A drain valve, comprising A valve body (1) having a water inlet channel (11), a water outlet channel (12) and a return channel (14) therein, wherein the inlet of the water outlet channel (12) is connected to the water inlet channel (11) via a water outlet hole (111), and the inlet of the return channel (14) is connected to the outlet of the water inlet channel (11) via a vent hole (141); and A water outlet valve core assembly (2), used for opening and closing the water outlet hole (111); Features: Also included is an exhaust valve core assembly (4), the exhaust valve core assembly (4) including A valve core seat (41) is sealed at the outlet of the water inlet channel (11) or in the return channel (14), a through hole (411) is provided in the middle, a flow groove (412) is provided on the surface facing the water flow direction and extends from the through hole (411) to the edge of the valve core seat (41), and a flow hole (4121) is provided on the bottom wall of the flow groove (412); and An umbrella-shaped valve core (42) comprises a rod portion (421) slidably inserted into the through hole (411) and an elastic umbrella portion (422); When the water inlet pressure of the water inlet channel (11) reaches a first preset pressure, the water outlet valve core assembly (2) opens the water outlet hole (111), and the umbrella portion (422) of the umbrella-shaped valve core (42) squeezes the flow groove (412) under the action of water flow and is in a first state; When the water inlet pressure of the water inlet channel (11) is less than the first preset pressure, the water outlet valve core assembly (2) closes the water outlet hole (111), and the umbrella portion (422) of the umbrella-shaped valve core (42) releases the squeezing of the flow groove (412) under the action of its own elastic force and is in the second state.

2. The drain valve according to claim 1, characterized in that: A limiting protrusion (4211) is provided on the peripheral wall of the rod portion (421), and the limiting protrusion (4211) and the umbrella portion (422) are respectively located on two sides of the valve core seat (41); In the second state, only the edge portion of the umbrella portion (422) abuts against the surface of the valve core seat (41) facing the water flow direction, and the limiting protrusion (4211) abuts against the surface of the valve core seat (41) facing away from the water flow direction.

3. The drain valve according to claim 1, characterized in that: The flow groove (412) extends along the radial direction of the valve core seat (41).

4. The drain valve according to claim 1, characterized in that: A reflux pipe joint (142) is installed at the outlet of the reflux channel (14), the valve core seat (41) is sealed in the reflux channel (14), and the tail end of the rod (421) extends into the inner cavity of the reflux pipe joint (142).

5. The drain valve according to claim 1, characterized in that: A water outlet pipe joint (122) is installed at the outlet of the water outlet channel (12); The water outlet valve core assembly (2) is installed in the water outlet channel (12) and includes A water outlet valve core (21), the head of which has a first plug (211); and A first elastic member (22) acts between the water outlet valve core (21) and the water outlet pipe joint (122) so that the first plug (211) always has a tendency to block the water outlet hole (111); When the water inlet pressure of the water inlet channel (11) reaches a first preset pressure, the first plug (211) of the water outlet valve core (21) is separated from the water outlet hole (111) under the action of water flow, so that the water outlet hole (111) is opened; When the water inlet pressure of the water inlet channel (11) is less than a first preset pressure, the first plug (211) of the water outlet valve core (21) blocks the water outlet hole (111) under the elastic force of the first elastic member (22), so that the water outlet hole (111) is closed.

6. The drain valve according to claim 5, characterized in that: The tail of the water outlet valve core (21) has a first outwardly protruding mounting column (212), and the first elastic member (22) is a compression spring, which is sleeved on the outer periphery of the first mounting column (212), and the two ends of the compression spring respectively abut against the opposite surfaces of the water outlet valve core (21) and the water outlet pipe joint (122).

7. The drain valve according to any one of claims 1 to 6, characterized in that: The valve body (1) further comprises a pressure regulating chamber (13) inside, the pressure regulating chamber (13) being connected to the water outlet channel (12) via a pressure relief hole (121), and being connected to the return channel (14) via a return hole (131), and the drain valve further comprises a pressure relief valve core assembly (3) for opening and closing the pressure relief hole (121); When the water inlet pressure of the water inlet channel (11) reaches a second preset pressure, the pressure relief valve core assembly (3) opens the pressure relief hole (121); When the water inlet pressure of the water inlet channel (11) is less than the second preset pressure, the pressure relief valve core assembly (3) closes the pressure relief hole (121).

8. The drain valve according to claim 7, characterized in that: The valve core seat (41) is sealed in the reflux channel (14), the second preset pressure is greater than the first preset pressure, and in the first state, the portion of the flow groove (412) close to the edge of the valve core seat (41) is not squeezed by the umbrella portion (422) of the umbrella-shaped valve core (42).

9. The drain valve according to claim 7, characterized in that: The pressure regulating chamber (13) has a screw hole (132) at a position facing the pressure relief hole (121), and an adjusting bolt (133) is threadedly connected to the screw hole (132); The pressure relief valve core assembly (3) is installed in the pressure regulating chamber (13) and includes A pressure relief valve core (31), the head of which has a second plug (311); and A second elastic member (32) acts between the pressure relief valve core (31) and the adjusting bolt (133) so that the second plug (311) always has a tendency to block the pressure relief hole (121); When the water inlet pressure of the water inlet channel (11) reaches a second preset pressure, the second plug (311) of the pressure relief valve core (31) is separated from the pressure relief hole (121) under the action of water flow, so that the pressure relief hole (121) is opened; When the water inlet pressure of the water inlet channel (11) is less than the first preset pressure, the second plug (311) of the pressure relief valve core (31) blocks the pressure relief hole (121) under the elastic force of the second elastic member (32), so that the pressure relief hole (121) is closed.

10. The drain valve according to claim 9, characterized in that: The tail of the pressure relief valve core (31) has a second protruding mounting column (312), and the second elastic member (32) is a compression spring, which is sleeved on the outer periphery of the second mounting column (312), and the two ends of the compression spring respectively abut against the opposite surfaces of the pressure relief valve core (31) and the adjusting bolt (133).

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