A valve with low pressure, high flow and low pressure loss
By designing a low-pressure, large flow and small pressure loss valve in the flush valve, the drainage channel and switching valve structure are used to control the flow direction of the back pressure chamber, the problem of small flow under low water pressure is solved, and the low pressure conditions are achieved traffic increases.
Patent Information
- Application Number
- CN202010876934.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-08-27
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2040-08-27
AI Technical Summary
The existing flush valve cannot be fully lifted at low water pressure, resulting in a small flow rate.
Design a valve with low pressure, large flow, small pressure loss. By the back pressure chamber of a single valve or two valves, water can flow into the corresponding water outlet or be directed into the atmosphere, avoiding the problem that the diaphragm cannot be fully lifted, and adopting valve body , water inlet, water outlet, drainage channel and switching valve structure, control the flow direction of water in the drainage channel, so as to increase the flow rate under low pressure.
It effectively avoids the problem of small flow rate under low water pressure and ensures an increase in flow rate under low pressure conditions.
Smart Images
Figure CN112066031B_ABST
Abstract
Description
[Technical field]
[0001] The invention relates to the technical field of bathroom equipment products, in particular to a valve with low pressure, large flow and small pressure loss. [Background technology]
[0002] The flush toilet is an indispensable sanitary appliance in people's lives. The flush toilet is equipped with a flush valve. With the advancement of technology, the flush valve is also developing continuously, from the previous button type, lever type, and foot type to the current induction type. In the prior art, the water in the pressure relief pipe of the single valve solenoid valve A flows from the back pressure chamber of the solenoid valve A, and finally flows into the main water flow of the solenoid valve A. Figure 1 In addition, the existing flush valve has two water outlets, such as Figure 2 , Figure 3 As shown in the figure, the water in the pressure relief pipe of solenoid valve A flows in from the back pressure chamber of solenoid valve A, and finally flows into the main water flow of solenoid valve A, and the same is true for solenoid valve B. The water in the back pressure chamber of each valve in the flushing valve flows into its corresponding outlet through outlet A2. And the water is discharged from the outlet on one side, and the water in the back pressure chamber flows into the outlet on the same side through outlet A2. This will cause the diaphragm to be unable to be fully lifted at low water pressure, resulting in a small flow rate at low water pressure. [Summary of the invention]
[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a valve with low pressure, large flow and small pressure loss. When a single valve or two valves are opened, the water in the back pressure chamber of one valve can flow into the water outlet of another valve or be led into the atmosphere through the corresponding water outlet A2, which can avoid the problem of small flow under low water pressure due to the inability to fully lift the diaphragm.
[0004] To achieve the above-mentioned purpose, the present invention proposes a low-pressure, high-flow, and low-pressure-loss valve, comprising a valve body, the valve body being provided with a water inlet, a water outlet A1, and a water outlet A2, the valve body being further provided with a valve A, a drainage channel A, a water supply chamber A, a water outlet chamber A, and a back-pressure chamber A, the water supply chamber A being arranged at the water inlet and equipped with a valve seat, a diaphragm A and a diaphragm plate A being arranged on the valve seat, a valve cover A being connected to the valve body, the valve cover A being buckled on a sealing portion A at the periphery of the diaphragm A to form a back-pressure chamber A, and a side flow passage being opened around the diaphragm A plate Channel A, the water supply chamber A is connected with the back pressure chamber A through the side flow channel A, a water outlet chamber A is provided on the side of the valve seat facing away from the diaphragm A, the water outlet chamber A is connected with the water outlet A1, the water outlet chamber A and the water supply chamber A are connected or closed through the valve seat and the diaphragm A, the valve A is arranged between the water inlet and the water outlet A2, the water inlet end of the drainage channel A is connected with the back pressure chamber A, the water outlet end of the drainage channel A is connected with the valve A, and is connected with the water outlet A2 through the valve A, and the valve A can connect or close the channel between the drainage channel A and the water outlet A2.
[0005] Preferably, the valve body also includes an air inlet connected to the atmosphere and a water-sealing movable part A, the air inlet is arranged between the water outlet chamber A and the water outlet A1 of the valve A, the water outlet end of the drainage channel A is connected to the air inlet through the water outlet A2, and a water-sealing movable part A is provided between the air inlet and the water outlet A1, the water-sealing movable part A can make the air inlet and the water outlet A1 communicate under the action of gravity, and seal the air inlet under the action of water pressure, so that the water outlet chamber A and the water outlet A1 are connected, and the water in the back pressure chamber A of the valve A is discharged to the air inlet through the drainage channel A and the water outlet A2.
[0006] The present invention also proposes a valve with low pressure, large flow and small pressure loss, comprising a valve body, wherein the valve body is provided with a water inlet, a water outlet A1 and a water outlet B1, and the valve body is also provided with a valve A, a drainage channel A, a water outlet A2 and a switching valve, the water inlet end of the switching valve is connected to the water outlet end of the valve A, the water inlet end of the valve A is connected to the water inlet, the two water outlet ends of the switching valve are respectively connected to the water outlet A1 and the water outlet B1, the water inlet end of the drainage channel A is connected to the back pressure chamber A of the valve A, the water outlet end of the drainage channel A is connected to the water outlet A1 or the water outlet B1 with low requirements for low pressure and flow through the water outlet A2, and the valve A can connect or close the channel between the drainage channel A and the water outlet A2.
[0007] The present invention also proposes a low-pressure, high-flow, low-pressure-loss valve, comprising a valve body, the valve body being provided with a water inlet, a water outlet A1, and a water outlet B1, the valve body being further provided with valves A and B, a drainage channel A, a drainage channel B, a water outlet A2, and a water outlet B2;
[0008] The water inlet end of the drainage channel A is connected to the back pressure chamber A of the valve A, and the water outlet end of the drainage channel A is connected to the water outlet B1 or the outside through the water outlet A2. The valve A can connect or close the channel between the drainage channel A and the water outlet A2;
[0009] The water inlet end of the drainage channel B is connected to the back pressure chamber B of the valve B, and the water outlet end of the drainage channel B is connected to the water outlet A1 or the outside through the water outlet B2. The valve B can connect or close the channel between the drainage channel B and the water outlet B2.
[0010] Preferably, it also includes an air inlet connected to the atmosphere and a water-sealing movable part A and a water-sealing movable part B, the water outlet end of the drainage channel A is connected to the air inlet through the water outlet A2, the water outlet end of the drainage channel B is connected to the air inlet through the water outlet B2, a water-sealing movable part A is provided between the outlet end of the air inlet A and the water outlet A1, a water-sealing movable part B is provided between the outlet end of the air inlet B and the water outlet B1, the water-sealing movable part A can connect or close the channel between the water outlet A1 and the water outlet A2, and the water-sealing movable part B can connect or close the channel between the water outlet B1 and the water outlet B2;
[0011] When water in the back pressure chamber A of valve A flows into the air inlet, the water sealing movable part A is closed under the action of water pressure, and the water sealing movable part B opens. The water flowing into the air inlet flows in from the water sealing movable part B and is discharged from the water outlet B1. Conversely, when water in the back pressure chamber B of valve B flows into the air inlet, the water is discharged from the water outlet A1.
[0012] Beneficial effects of the present invention: The present invention controls the flow direction of water in the drainage channel through a single valve, or two single valves, or a single valve + a switching valve, so that the water in the drainage channel directly flows into the outside, or flows mutually, or to the A side with high low-pressure flow requirements. The drainage of the drainage channel A is not directly discharged to the water outlet A1, but to the water outlet B1, or to the side with low low-pressure flow requirements. The above method can increase the flow rate when the valve is opened at low pressure, avoiding the phenomenon of small flow rate under low water pressure due to the inability to fully lift the diaphragm.
[0013] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.
Brief Description of the Drawings
[0014] Figure 1 It is a structural schematic diagram of a valve body in the prior art in which a single valve releases pressure to its own water outlet;
[0015] Figure 2 It is a structural schematic diagram of a double valve releasing pressure to its own water outlet in the prior art, wherein Figure a is a structural schematic diagram, and Figure b is a FF-direction cross-sectional schematic diagram of Figure a;
[0016] Figure 3 yes Figure 2 Schematic diagram of working principle of the prior art;
[0017] Figure 4 Schematic diagram of embodiment 1 of a valve with low pressure, large flow and small pressure loss according to the present invention;
[0018] Figure 5 It is a schematic diagram of the working principle of Example 1;
[0019] Figure 6 It is a schematic diagram of Example 2 of a valve with low pressure, large flow and small pressure loss according to the present invention;
[0020] Figure 7 It is a schematic diagram of the working principle of Example 2;
[0021] Figure 8 This is a schematic diagram of the working principle of Example 3 of a low-pressure, high-flow, and low-pressure-loss valve of the present invention;
[0022] Fig. 9 It is a structural schematic diagram of a valve embodiment 4 of the present invention with low pressure, large flow and small pressure loss;
[0023] Fig.10 yes Fig. 9 A top view of
[0024] Fig.11 yes Fig.10 AA section schematic diagram;
[0025] Fig.12 yes Fig. 9 BB section schematic diagram;
[0026] Fig.13 yes Fig. 9 EE section schematic diagram;
[0027] Fig.14 This is a schematic diagram of the working principle of a valve with low pressure, large flow and small pressure loss according to Embodiment 4 of the present invention;
[0028] Fig.15 It is a partial structural diagram of Embodiment 4 of the present invention;
[0029] Fig.16 yes Fig.15 Schematic diagram of CC section;
[0030] Fig.17 yes Fig.16 DD section diagram;
[0031] Fig.18 This is a schematic diagram of the working principle of Example 5 of a low-pressure, high-flow, and low-pressure-loss valve of the present invention;
[0032] Fig.19 It is a partial structural diagram of Embodiment 5 of the present invention;
[0033] Fig. 20 yes Fig.13 MM section diagram of ;
[0034] Fig.21 This is a schematic diagram of the working principle of Example 6 of a low-pressure, high-flow, and low-pressure-loss valve of the present invention;
[0035] Fig. 22 A partial structural diagram of Embodiment 6 of the present invention;
[0036] Fig.23 yes Fig. 22 Schematic diagram of the NN section. [Specific implementation method]
[0037] Example 1
[0038] See also Figure 4 and Figure 5The present invention discloses a low-pressure, high-flow, low-pressure-loss valve, comprising a valve body, wherein the valve body is provided with a water inlet 101, a water outlet A1 102, and a water outlet A2 501, and the valve body is further provided with a valve A30, a drainage channel A50, a water supply chamber A12, a water outlet chamber A13, and a back-pressure chamber A14, wherein the water supply chamber A12 is provided at the water inlet 101 and is provided with a valve seat 15, wherein a diaphragm A and a diaphragm plate A are provided at the valve seat 15, a valve cover A is connected to the valve body, and the valve cover A is buckled on a sealing portion A at the periphery of the diaphragm A to form a back-pressure chamber A14, a side flow channel A is opened around the diaphragm A plate, and the water supply chamber A12 is communicated with the back-pressure chamber A14 through the side flow channel A, and a water outlet chamber A13 is provided at the side of the valve seat 15 facing away from the diaphragm A, and the water outlet chamber A13 is communicated with the water outlet A1 102, the water outlet chamber A13 and the water supply chamber A12 are connected or closed through the valve seat 15 and the diaphragm A, the valve A30 is arranged between the water inlet 101 and the water outlet A2 501, the water inlet end of the drainage channel A50 is connected to the back pressure chamber A14, the water outlet end of the drainage channel A50 is connected to the valve A30, and communicates with the water outlet A2 501 through the valve A30, and the valve A30 can connect or close the channel between the drainage channel A50 and the water outlet A2 501. In this embodiment, a single valve structure is adopted, and the water in the back pressure chamber is discharged to the air through the water outlet A2.
[0039] Example 2
[0040] See also Figure 6 and Figure 7 On the basis of Example 1, the valve body further includes an air inlet connected to the atmosphere and a water-sealing movable part A80, the air inlet is arranged between the water outlet chamber A13 and the water outlet A1 102 of the valve A30, the water outlet end of the drainage channel A50 is connected to the air inlet through the water outlet A2 501, and a water-sealing movable part A80 is arranged between the air inlet and the water outlet A1 102, the water-sealing movable part A80 can make the air inlet and the water outlet A1 102 communicate under the action of gravity, and seal the air inlet under the action of water pressure, so that the water outlet chamber A13 and the water outlet A1 102 are connected, and the water in the back pressure chamber A14 of the valve A30 is discharged to the air inlet through the drainage channel A50 and the water outlet A2 501. In this embodiment, a single valve structure is adopted, and the water in the back pressure chamber is discharged to the air through the water outlet A2, and this air can be discharged to the vacuum breaking device.
[0041] Example 3
[0042] See also Figure 8The valve body is provided with a water inlet 101, a water outlet A1 102 and a water outlet B1 103. The valve body is also provided with a valve A30, a drainage channel A50, a water outlet A2 501 and a switching valve 11. The water inlet end of the switching valve 11 is connected to the water outlet end of the valve A30, the water inlet end of the valve A30 is connected to the water inlet 101, the two water outlet ends of the switching valve 11 are respectively connected to the water outlet A1 102 and the water outlet B1 103, the water inlet end of the drainage channel A50 is connected to the back pressure chamber A14 of the valve A30, the water outlet end of the drainage channel A50 is connected to the water outlet A1 102 or the water outlet B1 103 with low requirements for low pressure flow through the water outlet A2 501, the valve A30 can connect or close the channel between the drainage channel A50 and the water outlet A2 501, the water outlet A2 A second valve seat is provided at the inlet of 501, and a second blocking member for blocking the second valve seat is provided on the valve A30. In this embodiment, a single valve + switching valve structure is adopted, and the water in the back pressure chamber is depressurized to the side with low requirements for low pressure flow, so that a large flow rate can be ensured when the water is discharged from the A side.
[0043] Example 4
[0044] See also Figures 9 to 13 The present invention discloses a low-pressure, high-flow, and low-pressure-loss valve, comprising a valve body, wherein the valve body is provided with a water inlet 101, a water outlet A1 102, and a water outlet B1 103, wherein the water inlet 101 is provided with a water inlet chamber 1011 and a water outlet chamber B1012, wherein a first valve seat 1013 is provided between the water inlet chamber 1011 and the water outlet chamber B1012, wherein a diaphragm B104 is mounted on the first valve seat 1013, wherein a diaphragm plate B105 is embedded on the diaphragm B104, wherein a back-pressure cavity 106 is provided on the side of the diaphragm B104 facing away from the first valve seat 1013, wherein a first control valve 20 is further provided on the valve body, wherein a first blocking member is provided on the first control valve 20, wherein the water outlet A1 102, the water outlet B1 103, and the water inlet chamber 1011 and the water outlet chamber B1012 are provided with a water inlet chamber 1011 and a water outlet chamber B1012, wherein a first valve seat 1013 is provided between the water inlet chamber 1011 and the water outlet chamber B1012, wherein a diaphragm B104 is mounted on the first valve seat 1013, wherein a diaphragm plate B105 is embedded on the diaphragm B104, wherein a back-pressure cavity 106 is provided on the side of the diaphragm B104 facing away from the first valve seat 1013, wherein a first control valve 20 is provided with a first blocking member, wherein the water outlet A1 102, the water outlet B1 103, and the water inlet chamber 1011 are provided with a water inlet chamber 1011 and a water outlet chamber B101 The inlet of 103 is respectively provided with a valve seat A1021 and a valve seat B1031, and a switching chamber 107 is provided between the valve seat A1021 and the valve seat B1031, and the switching chamber 107 is communicated with the water outlet chamber B1012. The first blocking member is arranged in the switching chamber 107 to block the valve seat A1021 or the valve seat B1031. The valve body is also provided with valves A30 and B40, drainage channels A50 and B60, water outlet A2 501 and water outlet B2 601;
[0045] See also Figure 14-17, the water inlet end of the drainage channel A50 is connected to the back pressure chamber A14 of the valve A30, the water outlet end of the drainage channel A50 is connected to the water outlet B1 103 through the water outlet A2 501, the valve A30 can connect or close the channel between the drainage channel A50 and the water outlet A2 501, a second valve seat is provided at the inlet of the water outlet A2 501, and a second blocking member for blocking the second valve seat is provided on the valve A30;
[0046] The water inlet end of the drainage channel B60 is connected to the back pressure chamber B of the valve B40, and the water outlet end of the drainage channel B60 is connected to the water outlet A1 102 through the water outlet B2 601. The valve B40 can connect or close the channel between the drainage channel B60 and the water outlet B2 601. A third valve seat is provided at the inlet of the water outlet B2 601, and a third blocking member for blocking the third valve seat is provided on the valve B40.
[0047] Furthermore, the valve B40 also includes a coil assembly A401, and the third sealing member includes a movable iron core 402 and a cap 403. One end of the movable iron core 402 is provided with a cap 403 for sealing the third valve seat, and the other end of the movable iron core 402 is connected to the coil assembly A401 through a spring. The structure of the valve A30 is the same as that of the valve B40.
[0048] Furthermore, the first control valve 20 also includes a coil assembly B201, the first sealing member includes a moving valve core 202 and a magnet 204, one end of the moving valve core 202 has a sealing plate, and the other end is inserted into the coil assembly B201, the sealing plate is arranged between the valve seat A1021 and the valve seat B1031, the interior of the moving valve core 202 has a hollow inner cavity, and the hollow inner cavity is provided with a magnet 204 at one end of the coil assembly B201, when the coil assembly B201 is positively energized, the moving valve core 202 moves toward the side where the valve seat B1031 is located, and when the coil assembly B201 is negatively energized, the moving valve core 202 moves toward the side where the valve seat A1021 is located.
[0049] Furthermore, the outer sleeve of the blocking plate is provided with a first sealing member 203. When the coil assembly B201 is positively energized, the first sealing member 203 abuts against the valve seat B1031, blocking the valve seat B1031, so that the water outlet A1102 is communicated with the water outlet chamber B1012; when the coil assembly B201 is negatively energized, the first sealing member 203 abuts against the valve seat A1021, blocking the valve seat A1021, so that the water outlet B1103 is communicated with the water outlet chamber B1012.
[0050] The working principle of Example 4 is as follows:
[0051] The water path from the water inlet to the water outlet A works: the solenoid valve A opens, the coil assembly B201 is positively energized, the moving valve core 202 is attracted, and the valve seat B1031 is blocked, and water enters the water inlet 101. The coil assembly A401 is energized, the movable iron core 402 is attracted, the cap 403 is separated from the abutment against the third valve seat, the drainage channel A and the water outlet A2 are connected, and then the water in the back pressure chamber of the valve A30 is discharged to the water outlet B1, the pressure in the back pressure chamber decreases, the water pressure in the water inlet chamber 1011 lifts the diaphragm B104 and the diaphragm plate B105, the water flows into the water outlet chamber B1012, and then flows out to the first control valve 20, flows through the valve seat A1021, and finally flows out from the water outlet A1.
[0052] The water path from the water inlet to the water outlet B works: the solenoid valve B opens, the coil B is negatively charged, the moving valve core 202 is repelled, and the valve seat A1021 is blocked, and water enters the water inlet 101. The valve B40 is energized, the third valve seat opens, the drainage channel B and the water outlet B2 are connected, and then the water in the back pressure chamber of the valve B40 is discharged to the water outlet A1, the pressure in the back pressure chamber decreases, and the water pressure in the water inlet chamber 1011 lifts the diaphragm B104 and the diaphragm plate B105, and the water flows into the water outlet chamber B1012, and then flows out to the first control valve 20, flows through the valve seat B1031, and finally flows out from the water outlet B1.
[0053] Example 5
[0054] See also Figures 18 to 20 On the basis of implementation 4, the water outlet end of the drainage channel A50 communicates with the outside through the water outlet A2501, and the water outlet end of the drainage channel B60 communicates with the outside through the water outlet B2601.
[0055] The working principle of Example 5 is as follows:
[0056] On the basis of Example 1, the drainage ends of the drainage channel A and the drainage channel B are both connected to the outside, and the water in the back pressure chamber of the valve A30 and the back pressure chamber of the valve B40 is respectively discharged to the air.
[0057] Example 6
[0058] See also Figure 21 to Figure 23, based on implementation 4, it also includes an air inlet connected to the atmosphere and a water-sealing movable part A80 and a water-sealing movable part B90, the water outlet end of the drainage channel A50 is connected to the air inlet through the water outlet A2 501, the water outlet end of the drainage channel B60 is connected to the air inlet through the water outlet B2 601, a water-sealing movable part A80 is provided between the outlet end of the air inlet A and the water outlet A1 102, a water-sealing movable part B90 is provided between the outlet end of the air inlet B and the water outlet B1 103, the water-sealing movable part A80 can connect or close the channel between the water outlet A1 102 and the water outlet A2 501, and the water-sealing movable part B90 can connect or close the channel between the water outlet B1 103 and the water outlet B2 601;
[0059] When water in the back pressure chamber A14 of valve A30 flows into the air inlet, the water sealing movable part A80 is closed under the action of water pressure, and the water sealing movable part B90 opens, and the water flowing into the air inlet flows in from the water sealing movable part B90 and is discharged from the water outlet B1 103; conversely, when water in the back pressure chamber B of valve B40 flows into the air inlet, the water is discharged from the water outlet A1 102.
[0060] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.
Claims
1. A valve with low pressure, large flow and small pressure loss, comprising a valve body, wherein the valve body is provided with a water inlet (101), a water outlet A1 (102), and a water outlet A2 (501), Features: The valve body is further provided with a valve A (30), a drainage channel A (50), a water supply chamber A (12), a water outlet chamber A (13), and a back pressure chamber A (14). The water supply chamber A (12) is arranged at the water inlet (101) and is provided with a valve seat (15). A diaphragm A and a diaphragm plate A are arranged on the valve seat (15). A valve cover A is connected to the valve body. The valve cover A is buckled on a sealing portion A around the diaphragm A to form a back pressure chamber A (14). A side flow channel A is opened around the diaphragm A plate. The water supply chamber A (12) The side flow channel A is connected to the back pressure chamber A (14); a water outlet chamber A (13) is provided on the side of the valve seat (15) facing away from the diaphragm A; the water outlet chamber A (13) is connected to the water outlet A1 (102); the water outlet chamber A (13) and the water supply chamber A (12) are connected or closed via the valve seat (15) and the diaphragm A; the valve A (30) is arranged between the water inlet (101) and the water outlet A2 (501); the water inlet end of the drainage channel A (50) is connected to the back pressure chamber A (14); the drainage channel A (50) is connected to the back pressure chamber A (14); The water outlet end of the drainage channel A (50) is connected to the valve A (30), and communicates with the water outlet A2 (501) through the valve A (30). The valve A (30) can connect or close the channel between the drainage channel A (50) and the water outlet A2 (501); the valve body also includes an air inlet connected to the atmosphere and a water sealing movable part A (80). The air inlet is arranged between the water outlet chamber A (13) of the valve A (30) and the water outlet A1 (102). The water outlet end of the drainage channel A (50) is connected to the water outlet through the water outlet. The port A2 (501) is connected to the air inlet. A water-sealing movable part A (80) is provided between the air inlet and the water outlet A1 (102). The water-sealing movable part A (80) can connect the air inlet and the water outlet A1 (102) under the action of gravity, and seal the air inlet under the action of water pressure, so that the water outlet chamber A (13) and the water outlet A1 (102) are connected. Water in the back pressure chamber A (14) of the valve A (30) is discharged to the air inlet through the drainage channel A (50) and the water outlet A2 (501).
2. A valve with low pressure, large flow and small pressure loss, comprising a valve body, wherein the valve body is provided with a water inlet (101), a water outlet A1 (102) and a water outlet B1 (103), Features: The valve body is further provided with a valve A (30), a drainage channel A (50), a water outlet A2 (501) and a switching valve (11); the water inlet end of the switching valve (11) is connected to the water outlet end of the valve A (30); the water inlet end of the valve A (30) is connected to the water inlet (101); the two water outlet ends of the switching valve (11) are respectively connected to the water outlet A1 (102) and the water outlet B1 (103); the water inlet end of the drainage channel A (50) is connected to the back pressure chamber A (14) of the valve A (30); the water outlet end of the drainage channel A (50) is connected to the water outlet A1 (102) or the water outlet B1 (103) having a low requirement for low pressure flow through the water outlet A2 (501); and the valve A (30) can connect or close the channel between the drainage channel A (50) and the water outlet A2 (501).
3. A valve with low pressure, large flow and small pressure loss, comprising a valve body, wherein the valve body is provided with a water inlet (101), a water outlet A1 (102) and a water outlet B1 (103), Features: The valve body is further provided with valve A (30), valve B (40), drainage channel A (50), drainage channel B (60), water outlet A2 (501), and water outlet B2 (601); The water inlet end of the drainage channel A (50) is connected to the back pressure chamber A (14) of the valve A (30), and the water outlet end of the drainage channel A (50) is connected to the water outlet B1 (103) through the water outlet A2 (501), and the valve A (30) can connect or close the channel between the water inlet (101) and the water outlet A1 (102); The water inlet end of the drainage channel B (60) is connected to the back pressure chamber B of the valve B (40), and the water outlet end of the drainage channel B (60) is connected to the water outlet A1 (102) through the water outlet B2 (601). The valve B (40) can connect or close the channel between the water inlet (101) and the water outlet B1 (103).
4. A valve with low pressure, large flow and small pressure loss as claimed in claim 3, Features: It also includes an air inlet connected to the atmosphere, a water-sealing movable part A (80) and a water-sealing movable part B (90); the water outlet end of the drainage channel A (50) is connected to the air inlet via the water outlet A2 (501); the water outlet end of the drainage channel B (60) is connected to the air inlet via the water outlet B2 (601); a water-sealing movable part A (80) is provided between the outlet end of the air inlet A and the water outlet A1 (102); a water-sealing movable part B (90) is provided between the outlet end of the air inlet B and the water outlet B1 (103); the water-sealing movable part A (80) can connect or close the channel between the water outlet A1 (102) and the water outlet A2 (501); and the water-sealing movable part B (90) can connect or close the channel between the water outlet B1 (103) and the water outlet B2 (601); When water in the back pressure chamber A (14) of the valve A (30) flows into the air inlet, the water sealing movable part A (80) is closed under the action of the water pressure, and the water sealing movable part B (90) is opened. The water flowing into the air inlet flows in from the water sealing movable part B (90) and is discharged from the water outlet B1 (103). Conversely, when water in the back pressure chamber B of the valve B (40) flows into the air inlet, the water is discharged from the water outlet A1 (102).