CN112833228A

CN112833228A - Check valve and gas water heater system comprising same

Info

Publication number: CN112833228A
Application number: CN202110016455.2A
Authority: CN
Inventors: 吴帅; 朱海龙; 沈文权; 魏苗苗
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-05-25
Anticipated expiration: 2041-01-07
Also published as: CN112833228B

Abstract

The invention discloses a one-way valve and a gas water heater system comprising the same, wherein a shell of the one-way valve is provided with a first fluid inlet and a fluid outlet which are communicated with each other; the valve core assembly is used for enabling the fluid in the shell to flow in a single direction from the first fluid inlet; the valve core of the valve core assembly acts on the transmission assembly, and the transmission assembly is used for driving the blocking piece to be far away from or close to the fluid outlet along a straight line; the barrier is configured to reduce the flow area of fluid exiting the fluid outlet when the barrier is proximate the fluid outlet. The check valve drives the transmission assembly through the valve core, and the transmission assembly pushes the blocking piece to be close to the fluid outlet, so that the flow area of the fluid outlet is reduced, the fluid resistance of the fluid outlet is increased, and the phenomenon that the resistance of water outlet is too small when the fluid outlet of the check valve discharges water is avoided. The gas water heater system using the one-way valve can avoid the situation that the resistance of a cold water interface at a water using end is smaller than that of a hot water interface, and can avoid the accidental start of the water heater.

Description

Check valve and gas water heater system comprising same

Technical Field

The invention relates to the field of water heaters, in particular to a one-way valve and a gas water heater system comprising the same.

Background

The working principle of the water heater (non-return pipe circulating water heater) with zero cold water function and the water path system thereof is as follows: when a user is not in the process of using hot water, the water heater starts a self-contained circulating water pump when detecting that the water temperature in the pipeline is lower than the set temperature, the water pump flows water in the pipeline into the water heater to be heated after running, and the water pump stops running and the water heater stops working until the water in the pipeline is heated to the specified temperature.

In households not equipped with a water return pipeline, the gas water heater 110 is installed to find the water using end 120 at the farthest end of the water pipeline in the household, the water using end 120 may be a water tap, a hot water pipe 150 is connected with a cold water pipe 130 under the water tap, and a check valve 140 is generally installed at the position in order to prevent cold water from flowing back into the hot water pipe 150 when hot water is used. As shown in particular in figure 1. This connection is effective in some homes. However, this requires that a condition be satisfied, that is: the water resistance Z1 of the hot water pipe 150 to the last faucet is greater than the water resistance Z2 of the cold water pipe 130 to the last faucet. Now, it appears that the water resistance Z1 of the hot water pipe 150 in the household connected to the last tap is smaller than the water resistance Z2 of the cold water pipe 130 connected to the last tap. In this case, at the last faucet, when the user turns on the cold water, a portion of the water flow will flow from the cold water circuit and another portion from the hot water circuit. Even all of the water flow is from the hot water circuit. This will cause the water heater to start, and the user will actually be hot water when wanting to use cold water, which causes great trouble to the user.

Disclosure of Invention

The invention aims to overcome the defect that a water heater circulating system which utilizes a one-way valve to communicate a hot water pipeline and a cold water pipeline in the prior art has the problem that hot water flows out when cold water is needed, and provides the one-way valve and a gas water heater system comprising the same.

The invention solves the technical problems through the following technical scheme:

a one-way valve, comprising: the valve core assembly, the transmission assembly and the blocking piece are arranged in the shell;

the housing having a first fluid inlet and a fluid outlet in communication with each other;

the valve core assembly is used for enabling the fluid in the shell to flow in a single direction from the first fluid inlet;

the valve core of the valve core assembly acts on the transmission assembly, and the transmission assembly is used for driving the blocking piece to move away from or close to the fluid outlet along a straight line;

the barrier is configured to reduce a flow area of fluid exiting the fluid outlet when the barrier is proximate the fluid outlet.

Preferably, the housing has a variable diameter section, the small end of the variable diameter section faces the fluid outlet, and the blocking member is close to the fluid outlet along the variable diameter section to reduce the flow area of the fluid flowing out from the fluid outlet.

Preferably, the transmission assembly includes a link mechanism and a linear motion mechanism, the link mechanism is disposed between the valve core and the linear motion mechanism, the valve core drives the linear motion mechanism through the link mechanism, and the linear motion mechanism acts on the blocking member to move the blocking member away from or close to the fluid outlet.

Preferably, the link mechanism includes a first link, a second link, and a third link that are pivotally connected in sequence, the valve element is connected to the first link, the first link extends from a side surface of the valve element along a direction in which the valve element moves, an included angle between the second link and the third link is convex toward a direction away from the valve element, and the third link drives the linear motion mechanism.

Preferably, the linear motion mechanism includes a gear and a rack that are engaged with each other, the link mechanism drives the gear to rotate about a gear shaft that is fixed with respect to the housing, the rack extends along a motion direction of the blocking member and is movable along an extension direction thereof, and the blocking member is fixed to the rack.

Preferably, a driving ring is arranged on the side surface of the gear, the end part of the third connecting rod is clamped on the driving ring, and the connecting rod mechanism is in driving connection with the driving ring.

Preferably, a first rack bracket is further arranged in the housing, the first rack bracket is arranged at one end of the rack close to the blocking piece, the first rack bracket is provided with a through hole, and the rack is slidably arranged in the through hole;

and/or a second rack support is further arranged in the shell, the second rack support is arranged at one end, far away from the blocking piece, of the rack, a through hole is formed in the second rack support, and the rack is slidably arranged in the through hole.

Preferably, the housing includes a first section, a bending section and a second section which are sequentially communicated, the first section, the bending section and the second section form a U shape, an axis of the first section is parallel to an axis of the second section, the valve core assembly is disposed in the first section, the blocking member is disposed in the second section, and the link mechanism is disposed in the bending section.

Preferably, the second link and the third link are provided to be always convex toward a direction away from the spool.

The casing comprises a first section, a bending section and a second section which are communicated in sequence, the first section, the bending section and the second section form a U shape, the axis of the first section is parallel to the axis of the second section, the valve core assembly is arranged in the first section, the blocking piece is arranged in the second section, and the connecting rod mechanism is arranged in the bending section;

the transmission assembly comprises a connecting rod mechanism and a linear motion mechanism, the connecting rod mechanism is arranged between the valve core and the linear motion mechanism, the valve core drives the linear motion mechanism through the connecting rod mechanism, the linear motion mechanism acts on the blocking piece to enable the blocking piece to be far away from or close to the fluid outlet, and the second connecting rod and the third connecting rod are close to the inner ring of the bending section.

Preferably, the radial cross-sectional area of the bending section is larger than that of the first section;

and/or the radial cross-sectional area of the bending section is larger than that of the second section.

Preferably, a second fluid inlet is further arranged on the casing, and the second fluid inlet is communicated with the reducing section.

Preferably, the housing further comprises a turning section, the first section is communicated with the side wall of the turning section, and the first fluid inlet is arranged at the end part of the turning section.

Preferably, the cartridge assembly further comprises a valve seat against which the cartridge abuts to shut off a flow path from the first fluid inlet to the fluid outlet, and a resilient member biasing the cartridge in a direction such that the cartridge is adjacent to the valve seat.

Preferably, the check valve is used for a gas water heater system, the first fluid inlet is connected to a hot water interface of a water using end of the gas water heater system, and the fluid outlet is connected to a cold water interface of the water using end of the gas water heater system.

A gas water heater system is characterized by comprising the check valve, the gas water heater and a water using end;

the housing further having a second fluid inlet;

the first fluid inlet is connected to a hot water interface of a water consumption end of the gas water heater system, the fluid outlet is connected to a cold water interface of the water consumption end of the gas water heater system, and the second fluid inlet is connected to a cold water inlet of the gas water heater.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

the check valve drives the transmission assembly through the valve core, and the transmission assembly pushes the blocking piece to be close to the fluid outlet, so that the flow area of the fluid outlet is reduced, the fluid resistance at the fluid outlet is increased, and the phenomenon that the resistance of water outlet is too small when the fluid outlet of the check valve discharges water is avoided. The gas water heater system using the one-way valve can avoid the trouble that the cold water interface resistance of the water using end is smaller than the resistance of the hot water interface, thereby avoiding the hot water flowing out due to the cold water requirement and avoiding the accidental starting of the water heater.

Drawings

Fig. 1 is a schematic diagram of water circuit communication of a gas water heater in the prior art.

Fig. 2 is a schematic structural diagram of the gas water heater system of the present invention.

Fig. 3 is a perspective view illustrating a check valve according to a preferred embodiment of the present invention.

Fig. 4 is a cross-sectional schematic view of the check valve of fig. 3, with the valve core assembly in an open state.

FIG. 5 is a cross-sectional view of the check valve of FIG. 3, wherein the valve core assembly is in an open position and cold water is cut open by the water end.

Fig. 6 is a cross-sectional schematic view of the check valve of fig. 3, with the valve core assembly in a closed state.

Fig. 7 is a schematic structural diagram of a valve core and a first connecting rod of the check valve in fig. 3.

Fig. 8 is a schematic structural view of a second link of the check valve of fig. 3.

Fig. 9 is a schematic structural view of a third link of the check valve of fig. 3.

Fig. 10 is a schematic view of a structure of a gear of the check valve of fig. 3.

Fig. 11 is a schematic structural view of a blocking member and a rack of the check valve in fig. 3.

Description of reference numerals:

gas water heater system 100

Gas water heater 110

Water end 120

Cold water pipe 130

One-way valve 140

Hot water pipe 150

Check valve 200

Case 210

First fluid inlet 211

Second fluid inlet 212

Fluid outlet 213

Fluid inlet 214

First segment 215

Bend section 216

Second segment 217

The turning section 218

Reducer segment 219

Valve core assembly 220

Valve seat 221

Elastic member 222

Valve support 223

Valve core 224

Transmission assembly 230

Link mechanism 240

First link 241

Second link 242

Third link 243

Linear motion mechanism 250

Gear 251

Rack 252

Driving coil 253

First rack support 254

Through hole 255

Second rack support 256

Through hole 257

Gear shaft 258

Stopper 260

Detailed Description

The present invention is further illustrated by way of example and not by way of limitation in the scope of the embodiments described below in conjunction with the accompanying drawings.

As shown in fig. 2, the gas water heater system 100 includes a gas water heater 110, a water use end 120, a check valve 200, a hot water pipe 150, and a cold water pipe 130. The water consuming end 120 may generally be in the form of a faucet or shower head, with the water consuming end 120 having a cold water connection and a hot water connection. The cold water pipe 130 is used to supply cold water, which is cold water that has not been heated by the gas water heater 110, and does not mean that its temperature must be lower than a certain value. The cold water pipe 130 typically communicates with a municipal water supply.

The check valve 200 is disposed in a pipe connecting the cold water pipe 130 and the hot water pipe 150 of the water using end 120 farthest from the gas water heater 110 in the gas water heater system 100.

As shown in fig. 3-11, the check valve 200 includes a housing 210, and a valve core assembly 220, a transmission assembly 230, and a blocking member 260 disposed in the housing 210. The housing 210 has a first fluid inlet 211 and a fluid outlet 213 communicating with each other; the valve core assembly 220 is used for enabling the fluid in the shell 210 to flow in a single direction from the first fluid inlet 211; the spool 224 of the spool assembly 220 acts on the drive assembly 230, and the drive assembly 230 acts to drive the check 260 in a straight line away from or toward the fluid outlet 213; the barrier 260 serves to reduce the flow area of fluid exiting the fluid outlet 213 when the barrier 260 is proximate the fluid outlet 213.

The check valve 200 of this embodiment drives the transmission assembly 230 through the valve element 224, and the transmission assembly 230 pushes the blocking member 260 to approach the fluid outlet 213, so that the flow area of the fluid outlet 213 is reduced, the fluid resistance at the fluid outlet 213 is increased, and the resistance of the water outlet is prevented from being too small when the fluid outlet 213 of the check valve 200 discharges water. The gas water heater system 100 using the check valve 200 can avoid the trouble of 'hot water flows out when cold water is needed' due to the fact that the resistance of the cold water interface of the water using end 120 is smaller than that of the hot water interface, and can also avoid the accidental starting of the water heater.

The housing 210 has a tapered section 219, a small end of the tapered section 219 facing the fluid outlet 213, and the barrier 260 along the tapered section 219 near the fluid outlet 213 to reduce the flow area of the fluid exiting the fluid outlet 213. The flow area may be the area of the cross-section of the reducer section 219 minus the area of the cross-section of the corresponding location of the baffle 260. During the process that the blocking member 260 approaches the fluid outlet 213, the area of the cross section of the variable diameter section 219 becomes smaller in the direction approaching the fluid outlet 213, while the area of the cross section of the blocking member 260 does not change, so that the flow area becomes smaller, thereby increasing the fluid resistance at the fluid outlet 213.

In one embodiment, barrier 260 is a cylinder having one end facing fluid outlet 213. The blocking member 260 of the present embodiment is specifically a hollow cylinder, and in other embodiments, the blocking member 260 may have other shapes, such as a cube, a sphere, and the like. The baffle 260 may reduce the flow area of the fluid flowing out from the fluid outlet 213. The outer sidewall of the blocking member 260 is also fitted to the inner sidewall of the housing 210, so that stability during movement of the blocking member 260 can be improved.

In other embodiments, the stop 260 and the reducer 219 may be configured with other shapes to reduce the flow area.

As shown in fig. 4, the transmission assembly 230 includes a link mechanism 240 and a linear motion mechanism 250, the link mechanism 240 is disposed between the spool 224 and the linear motion mechanism 250, the spool 224 drives the linear motion mechanism 250 through the link mechanism 240, and the linear motion mechanism 250 acts on the stopper 260 to move the stopper 260 away from or close to the fluid outlet 213.

The link mechanism 240 includes a first link 241, a second link 242, and a third link 243 pivotally connected in sequence, the valve spool 224 is connected to the first link 241, the first link 241 extends from a side surface of the valve spool 224 along a moving direction of the valve spool 224, an included angle between the second link 242 and the third link 243 is convex toward a direction away from the valve spool 224, and the third link 243 drives the linear motion mechanism 250.

The linear motion mechanism 250 includes a gear 251 and a rack 252 engaged with each other, the link mechanism 240 drives the gear 251 to rotate about a gear shaft 258 fixed with respect to the housing 210, the rack 252 extends along a moving direction of the stopper 260 and is movable along the extending direction thereof, and the stopper 260 is fixed to the rack 252.

As shown in fig. 9 and 10, a driving coil 253 is provided on a side surface of the gear 251, an end portion of the third link 243 is engaged with the driving coil 253, and the link mechanism 240 is drivingly connected to the driving coil 253.

The housing 210 is further provided with a first rack support 254, the first rack support 254 is disposed at one end of the rack 252 close to the blocking member 260, the first rack support 254 is provided with a through hole 255, and the rack 252 is slidably disposed in the through hole 255.

The housing 210 further has a second rack support 256 disposed therein, the second rack support 256 is disposed at an end of the rack 252 away from the blocking member 260, the second rack support 256 is provided with a through hole 257, and the rack 252 is slidably disposed in the through hole 257.

The first and

second rack brackets

254 and 256 are respectively located at both sides of the gear 251. The first gear 251 and the second gear 251 may be both formed by a cylindrical member, the cylindrical member is disposed inside the housing 210, a through hole 255 or a through hole 257 is disposed in the cylindrical member, and the rack 252 slidably penetrates therethrough. Gaps through which fluid flows are formed between the first gear 251 and the second gear 251 and the inner side wall of the shell 210.

Fig. 7-11 show a schematic view of the linkage mechanism 240 and the rack and pinion mechanism in detail. The first connecting rod 241 and the spool 224 are a unitary structure. The first link 241, the second link 242 and the third link 243 are all matched and sequentially and rotatably connected through shaft holes. The gear 251 is rotatably disposed on the gear shaft 258, and the third link 243 is fixedly connected to the driving ring 253 of the gear 251. The valve core 224 can move downwards under the pushing of the fluid, the first connecting rod 241 moves downwards along with the valve core 224 synchronously, the first connecting rod 241 drives the second connecting rod 242 to rotate, the rotating second connecting rod 242 drives the third connecting rod 243 to rotate, so as to drive the gear 251 to rotate around the gear shaft 258, the rotating gear 251 drives the rack 252 to move upwards, and then the rack 252 drives the blocking member 260 to move upwards, and the blocking member 260 is close to the fluid outlet 213.

In other embodiments, the link mechanism 240 may also be a multi-link assembly in other forms, and it is also possible to design the second link 242 and the third link 243 as a same link, and a sliding slot is disposed at an end of the same link, and the first link 241 pushes the same link to rotate downward through the sliding slot, so as to drive the gear 251 to rotate.

In other embodiments, the linear motion mechanism 250 may be in other forms, such as: a slide block and a guide rail which are matched with each other, wherein the slide block is arranged on the guide rail in a sliding way, the link mechanism 240 drives the slide block to move along the guide rail, and the moving sliding pushes the blocking part 260 to be close to the fluid outlet 213.

As shown in fig. 4, the housing 210 includes a first section 215, a bending section 216, and a second section 217, which are sequentially connected, the first section 215, the bending section 216, and the second section 217 form a U shape, an axis of the first section 215 is parallel to an axis of the second section 217, the valve core assembly 220 is disposed in the first section 215, the stopper 260 is disposed in the second section 217, and the link mechanism 240 is disposed in the bending section 216.

The second link 242 and the third link 243 are provided to be always convex in a direction away from the spool 224.

The second link 242 and the third link 243 are close to the inner circle of the bending section 216, so that the included angle between the second link 242 and the third link 243 is prevented from being convex toward the direction close to and away from the valve core 224. As shown in fig. 4, the inner circumference of the bend section 216 is the upper side of the inner wall.

The radial cross-sectional area of the bend section 216 is greater than the radial cross-sectional area of the first section 215. The radial cross-sectional area of the bend section 216 may also be greater than the radial cross-sectional area of the second section 217. The larger cross-sectional area of the bend section 216 allows for more convenient placement of the drive assembly 230.

The housing 210 is further provided with a second fluid inlet 212, and the second fluid inlet 212 is communicated with the reducer section 219. The second fluid inlet 212 may be in communication with the cold water pipe 130, with cold water flowing into the check valve 200 through the second fluid inlet 212. The sidewall of the second section 217 of the housing 210 may also extend outward to form a second fluid inlet 212.

The housing 210 further includes a turnaround section 218, the first section 215 communicating through a sidewall of the turnaround section 218, and the first fluid inlet 211 provided at an end of the turnaround section 218. The turnaround portion 218 facilitates communication with external conduits.

The valve core assembly 220 further includes a valve seat 221, an elastic member 222 and a valve support 223, wherein the valve core 224 and the elastic member 222 are disposed between the valve seat 221 and the valve support 223, the elastic member 222 is configured to push the valve core 224 against the valve seat 221, and a portion of the transmission assembly 230 passes through the valve support 223 and is connected to the valve core 224. The spool 224 abuts the valve seat 221 to shut off a flow path from the first fluid inlet 211 to the fluid outlet 213, and the elastic member 222 biases the spool 224 in a direction such that the spool 224 approaches the valve seat 221. The elastic member 222 may be embodied as a spring.

The operation of the check valve 200 and the gas water heater system 100 will be briefly described below.

When the gas water heater system 100 and the water use end 120 are simultaneously closed, the check valve 200 is in the state shown in fig. 6, and no fluid flows in the check valve 200.

When the gas water heater system 100 starts hot water circulation, the state of the check valve 200 is as shown in fig. 5, hot water flows out from the hot water outlet of the gas water heater 110 and flows to the check valve 200 through the hot water pipe 150, the hot water pushes and opens the valve core 224, then flows out through the second fluid inlet 212 and flows back to the gas water heater 110 along the cold water pipe 130 until the pipeline of the whole water heater system is filled with hot water. Therefore, when the water using end 120 is opened, the user can use the hot water immediately, and the function of zero cold water is realized. The unnumbered arrowed curve in fig. 5 indicates the water flow direction.

When the gas water heater system 100 is not activated to circulate hot water and opens the cold water outlet of the water using end, as shown in fig. 4, in the case that cold water needs to be used alone, there is a case that the resistance of the hot water pipe 150 (the general pipe from the cold water pipe 130 to the fluid outlet 213 via the gas water heater 110) is smaller than the resistance of the cold water pipe 130 (the general pipe from the cold water pipe 130 to the fluid outlet 213), at this time, the fluid in the check valve 200 enters from the first fluid inlet 211, because the fluid outlet 213 is opened, the inlet side pressure of the spool assembly 220 is greater than the outlet side pressure, causing the spool 224 to open, the spool 224 drives the stopper 260 to move towards the fluid outlet 213 via the transmission assembly 230, so that the resistance at the fluid outlet 213 becomes large, that the resistance of the hot water pipe 150 becomes large, so that more water in the cold water pipe 130 flows in from the second fluid inlet 212 and flows out from the fluid outlet 213 without passing through the gas water, and less water passes through the gas water heater 110 and flows out from the hot water outlet of the gas water heater 110 to the first fluid inlet 211 of the check valve 200 and further flows out from the fluid outlet 213, so that the gas water heater 110 is prevented from being started by mistake, and at the moment, cold water flows out from the cold water outlet of the water using end 120. The unnumbered arrowed curve in fig. 4 indicates the water flow direction.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A one-way valve, comprising: the valve core assembly, the transmission assembly and the blocking piece are arranged in the shell;

the housing having a first fluid inlet and a fluid outlet;

the valve core assembly is used for enabling the fluid in the shell to flow in a single direction from the first fluid inlet to the fluid outlet;

2. The check valve of claim 1, wherein said housing has a tapered section with a small end facing said fluid outlet, said barrier being adjacent said fluid outlet along said tapered section to reduce the flow area of fluid exiting said fluid outlet.

3. The check valve of claim 1, wherein the transmission assembly includes a linkage mechanism and a linear motion mechanism, the linkage mechanism being disposed between the spool and the linear motion mechanism, the spool driving the linear motion mechanism through the linkage mechanism, the linear motion mechanism acting on the blocking member to move the blocking member away from or toward the fluid outlet.

4. The check valve as in claim 3, wherein the linkage mechanism comprises a first link, a second link, and a third link pivotally connected in sequence, the spool is connected to the first link, and the third link drives the linear motion mechanism.

5. The check valve as in claim 4, wherein said linear motion mechanism includes an intermeshing gear and a rack, said linkage driving said gear to rotate about a gear axis fixed relative to said housing, said rack extending along a direction of movement of said blocking member and being movable along a direction of extension thereof, said blocking member being fixed to said rack.

6. The check valve as claimed in claim 5, wherein a driving ring is fixedly arranged on a side surface of the gear, and an end portion of the third link is clamped on the driving ring.

7. The check valve as in claim 5, wherein a first rack bracket is further disposed in the housing, the first rack bracket is disposed at an end of the rack adjacent to the blocking member, the first rack bracket is disposed with a through hole, and the rack is slidably disposed in the through hole;

8. The check valve according to any of claims 1-7, wherein the housing comprises a first section, a bent section and a second section which are sequentially communicated, the first section, the bent section and the second section form a U shape, the axis of the first section is parallel to the axis of the second section, the valve core assembly is arranged in the first section, and the blocking piece is arranged in the second section;

the transmission assembly comprises a connecting rod mechanism and a linear motion mechanism, the connecting rod mechanism is arranged between the valve core and the linear motion mechanism, the valve core drives the linear motion mechanism through the connecting rod mechanism, the linear motion mechanism acts on the blocking piece to enable the blocking piece to be far away from or close to the fluid outlet, and the connecting rod mechanism is arranged in the bending section.

9. The check valve as in claim 4, wherein said second link and said third link are arranged to always project away from said spool.

10. The check valve as in claim 9, wherein the housing includes a first section, a bending section and a second section that are sequentially connected, the first section, the bending section and the second section form a U-shape, an axis of the first section is parallel to an axis of the second section, the valve core assembly is disposed in the first section, the blocking member is disposed in the second section, the link mechanism is disposed in the bending section, and the second link and the third link are close to an inner ring of the bending section.

11. The check valve of claim 2 wherein said housing further defines a second fluid inlet port, said second fluid inlet port communicating with said reducer section.

12. The one-way valve of claim 1, wherein the cartridge assembly further comprises a valve seat against which the cartridge abuts to shut off a flow path from the first fluid inlet to the fluid outlet, and a resilient member biasing the cartridge in a direction such that the cartridge is proximate to the valve seat.

13. The check valve as recited in claim 1 wherein the check valve is for a gas water heater system, the first fluid inlet being connected to a hot water connection of a water user of the gas water heater system, the fluid outlet being connected to a cold water connection of the water user of the gas water heater system.

14. A gas water heater system, characterized in that it comprises a one-way valve according to any one of claims 1-13, a gas water heater and a water end;

the housing further having a second fluid inlet;