CN102777648A - Flow limiting shutoff valve - Google Patents

Abstract

The invention relates to a flow limiting shutoff valve which comprises a flow stop valve and a block valve. The flow stop valve comprises a valve body, a piston and a bias component. A through cavity is formed on the valve body, a water outlet of the through cavity is provided with a sealing seat, the piston can be arranged in the through cavity axially movably back and forth, and a middle cavity is formed by matching among a corresponding outer wall of the piston, an inner wall of the through cavity and the sealing seat. A flow-guiding through hole with a preset through-flow area is formed on the piston, and the middle cavity is communicated with a water inlet through the flow-guiding through hole. One end of the piston towards the sealing seat is provided with a sealing element. When flow of the water inlet is smaller than a preset value, the sealing element is separated from the sealing seat; when the flow of the water inlet is larger than the preset value, the sealing element positioned on the piston is in contact seal with the sealing seat; and when the block valve is closed, automatic reset of the piston can be achieved.

Description

A flow limiting shut-off valve

technical field

The invention relates to a valve body device, in particular to a flow limiting shut-off valve. the

Background technique

With the development of society and economy and the increasing shortage of energy, especially in today's serious shortage of water resources, people have higher requirements for the maximization, convenience and safety of water resources utilization. In actual daily life, water pipes, faucets and other equipment are prone to sudden damage due to long-term frequent use, which often leads to a continuous outflow of large streams of water and waste of water resources. In the prior art, for water pipes, faucets, etc. Sudden damage to equipment, etc., is often remedied by manually closing the main gate on the water pipe. However, it takes a certain amount of reaction time to close the main gate due to the discovery of damage to the faucet, especially when no one is on-site to control the accident. Not only is it easy to cause a great waste of water resources, but also because the overflowing water floods the floor, furniture and other supplies of the family, it will cause a certain degree of property loss to the user. In serious cases, the overflow will even affect the surrounding residents. The consequences will be more serious. the

Chinese patent document CN2937705Y discloses a pressure-limiting water cut-off valve, which includes a casing, and a water outlet and a water inlet provided on the casing. The structure includes: a connecting rod, which can form a displacement along a channel, and is connected with a blocking member, which is arranged in the sealing chamber, and can block the water outlet and the water inlet along with the displacement of the connecting rod The water flow channel between them; an elastic member is arranged between the connecting rod and the housing, and is used to support the connecting rod when the water pressure is lower than a predetermined position so that the blocking member maintains the water flow A location with clear access. The pressure-limiting water cut-off valve is provided with a non-return structure between the connecting rod and the housing, which can cut off and keep the blocked state when the pressure reducing valve is damaged due to excessive water pressure, so as to prevent the water flow without decompression Direct flow to the terminal equipment will cause damage to the terminal equipment. Therefore, the purpose of setting up this pressure limiting water cut-off valve is to automatically cut off the water flow when the water pressure is too high. The blocking member cannot be reset automatically, so it is very inconvenient to use. the

Contents of the invention

In order to solve the technical problem in the prior art that the blocking member cannot be automatically reset after a flow cutoff occurs in the water cutoff valve, the present invention provides a flow limiting throttle valve that can automatically reset after a flow cutoff occurs. the

The technical scheme of the flow limiting shut-off valve of the present invention is:

A flow limiting cut-off valve, including a flow cut-off valve that can automatically cut off the water flow when the water flow at the water inlet is greater than a preset value, the flow cut-off valve includes

The valve body is formed with a through cavity, the through cavity includes a water inlet and a water outlet, and the water outlet of the through cavity is provided with a sealing seat;

A piston, the piston is axially reciprocated and arranged in the through cavity, and is located between the water inlet and the water outlet of the through cavity, the corresponding outer wall of the piston, the inner wall of the through cavity and The sealing seats cooperate to form an intermediate chamber, and a diversion hole with a preset flow area is formed on the piston, and the intermediate chamber communicates with the water inlet through the diversion hole. One end of the piston facing the sealing seat is provided with a sealing element, and when the flow rate of the water inlet is less than a preset value, the sealing element is separated from the sealing seat, and the intermediate cavity passes through the sealing element and the sealing element. The gap formed between the sealing seats communicates with the water outlet; when the flow rate of the water inlet is greater than a preset value, the piston moves toward the sealing seat under the push of hydraulic pressure until the The seal on the piston is in contact with the seal seat to seal and cut off the water flow;

A biasing component, the biasing component is arranged between the end of the piston close to the water inlet of the through cavity and the sealing seat;

It also includes a shut-off valve, the water outlet of the shut-off valve communicates with the water inlet of the flow shut-off valve, and when the shut-off valve is closed, the sum of the external pressure and the reset force of the biasing member is greater than that of the shut-off valve The hydraulic pressure between the water outlet and the water inlet of the flow cut-off valve realizes the reset of the piston. the

In the above-mentioned flow limiting shut-off valve, at least one of the two surfaces of the sealing member in contact with the sealing seat is provided with a raised or recessed pattern or pattern. the

For the above-mentioned flow limiting shut-off valve, a hollow adapter assembly is provided at the water outlet of the flow shut-off valve, and the sealing seat is formed by inserting one end of the adapter assembly into the water outlet, and the flow shut-off valve passes through the The adapter assembly is connected with external pipelines. the

In the above-mentioned flow limiting shut-off valve, the piston includes a head with a larger diameter and a tail with a smaller diameter, the head is suitable for sliding along the inner wall of the cavity, and the head is formed with a predetermined flow area A throttling hole; a seal is provided on the tail. the

For the above-mentioned flow limiting shut-off valve, a guide rod with one end extending into the adapter assembly 6 is also provided on the end surface of the tail of the piston. the

For the above-mentioned flow limiting shut-off valve, an annular groove is also formed on the end surface of the end of the adapter assembly inserted into the through cavity, one end of the biasing member is sleeved on the tail of the piston, and the other end is set Springs in slots. the

In the flow limiting cut-off valve, the cut-off valve is a ball valve. the

Above-mentioned technical scheme of the present invention has the following advantages compared with prior art:

The flow limiting shut-off valve provided by the present invention can not only allow the water flow to pass freely during normal use, but also can automatically cut off the water flow when the water pipe or faucet is suddenly damaged. More importantly, the flow shut-off valve can Automatic reset, only need to close the cut-off valve, when the flow cut-off valve changes from the cut-off state to the open state, the piston in the flow cut-off valve can be automatically reset under the action of the spring and the external pressure, which is very convenient to use. the

Description of drawings

In order to make the content of the present invention easier to understand, the content of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments. Wherein the pistons in Figures 1 to 5 have a larger head and a smaller tail, and the guiding orifice is on the head of the piston without an inflection point. the

Fig. 1 is an assembly diagram of Embodiment 1 of the flow limiting shut-off valve of the present invention. the

Fig. 2 is a schematic diagram of the circulation of water when the flow rate does not exceed the preset value in Embodiment 1 of the flow limiting shut-off valve of the present invention. the

Fig. 3 is a partial enlarged view of the flow diagram of water flow in Embodiment 1 of the flow limiting shut-off valve of the present invention when the flow rate does not exceed the preset value. the

Fig. 4 is a schematic diagram of sealing of Embodiment 1 of the flow limiting shut-off valve of the present invention when the flow rate exceeds a preset value. the

Fig. 5 is a partial enlarged view of the sealing diagram of Embodiment 1 of the flow limiting shut-off valve of the present invention when the flow rate exceeds a preset value. the

Fig. 6 is a schematic diagram of the flow of water in Embodiment 2 of the flow limiting shut-off valve of the present invention when the flow rate does not exceed the preset value. the

Reference signs are: 1-ball valve, 2-valve body, 3-piston, 4-seal, 5-spring, 6-adapter assembly, 7-(valve body) water inlet, 8-(valve body) water outlet , 9-guide flow hole, 10-guide rod, 11-groove, 12-(ball valve) water outlet, 13-intermediate cavity. the

Detailed ways

Example 1

As shown in FIG. 1 , a flow limiting cut-off valve in this embodiment includes a flow cut-off valve and a ball valve 1 that can automatically cut off the water flow when the water flow at the water inlet is greater than a preset value. the

The flow cut-off valve includes a valve body 2, a piston 3 and a spring 5, and a through cavity is formed on the valve body, and the through cavity includes a water inlet 7 and a water outlet 8, and the water outlet 8 of the through cavity is provided with a seal Seat; the piston 3 is arranged in the through cavity axially and reciprocally movable, and is between the water inlet 7 and the water outlet 8 of the through cavity, the corresponding outer wall of the piston 3, the through cavity The inner wall of the cavity and the sealing seat cooperate to form an intermediate cavity 13. The piston 3 includes a head with a larger diameter and a tail with a smaller diameter. The head is suitable for sliding along the inner wall of the through cavity, and the piston 3 A diversion hole 9 with a preset flow area is formed on the head, and the intermediate cavity 13 communicates with the water inlet 7 through the diversion hole 9; The guide rod 10 in the adapter assembly 6, the tail of the piston 3 is provided with a seal 4, and the surface of the seal used to be in contact with the seal seat is provided with a raised pattern; the spring 5 Set between the head of the piston 3 and the sealing seat, one end is sleeved at the tail of the piston 3, and the other end is set at the end of the adapter assembly 6 inserted into the valve body cavity In the annular groove 11 formed on the end face. the

When the flow rate does not exceed the preset value, as shown in Figure 2 and Figure 3, the seal 4 is separated from the seal seat, and the intermediate cavity 13 is formed between the seal 4 and the seal seat. The gap communicates with the water outlet. Water flows into the water inlet of the valve body 2 through the ball valve 1, then impacts the piston 3 and flows out mainly along the guide hole 9 and the intermediate cavity 13 on the piston 3, then flows into the water outlet of the valve body 2, and then flows out through the water flow channel of the adapter assembly 6 At this time, the spring 5 plays a role of resisting the piston 3, preventing the seal 4 moving together with the piston 3 from contacting the adapter assembly 6, thereby allowing the water to flow smoothly. the

In the above-mentioned embodiments, as an optional implementation, the surface of the sealing member can be kept smooth, and raised or recessed patterns or patterns are provided on the surface of the sealing seat used to contact the sealing member; It is also possible to set raised or recessed patterns or patterns on the contact surface of the sealing seat and the contact surface of the sealing seat at the same time. the

When the water pipe or faucet is suddenly damaged, the flow through the ball valve 1 and the flow stop valve will suddenly increase. When the flow through the valve exceeds the preset value, as shown in Figure 4 and Figure 5, due to the The flow area of the guide orifice 9 is limited, that is, the flow rate allowed to pass per unit time is limited. Therefore, a large amount of liquid that cannot pass through the water inlet in the future will overcome the elastic force of the spring 5 and push the piston 3 to move toward the sealing seat. , until the seal 4 on the piston 3 contacts and seals with the sealing seat, thereby cutting off the water flow. the

After the flow rate exceeds the preset value and the water flow is cut off, the ball valve 1 is closed. At this time, the original water pressure is maintained inside the valve body 2. When the sum of the external pressure and the reset force of the spring 5 is greater than the water outlet 12 and When the hydraulic pressure between the water inlet 7 of the flow cut-off valve, the piston is pushed to move away from the sealing seat, so that the seal 4 is separated from the seal seat to reset the piston, and the flow cut-off valve opens. At this time, the damaged water pipe or water tap can be replaced. After the replacement, the ball valve 1 is opened, and the flow limiting shut-off valve of the present invention can be used normally again, which is very convenient. the

Example 2

As an optional embodiment, the piston 3 can also be configured as a cylindrical structure with the same diameter at the head and tail, and at the same time, the guide hole 9 can be configured with an inflection point, as shown in FIG. 6 . the

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation modes here, and the obvious changes or changes derived therefrom are still within the protection scope of the present invention. the

Claims (7)

1. a flow restriction shutoff valve is characterized in that, when comprising a water inlet water flow greater than predefined value, can block the flow stop valve of current automatically, and said flow stop valve comprises

Valve body (2) forms cavity on the said valve body, and said cavity comprises water intake (7) and water outlet, and the water outlet of said cavity (8) is provided with sealing seat;

Piston (3); Said piston (3) can axially come and go and be arranged on movably in the said cavity; And be between the water intake (7) and said water outlet (8) of said cavity; Cooperate between the respective external wall of said piston (3), the inwall of said cavity and the said sealing seat to form an intermediate cavity (13), form the water conservancy diversion through hole (9) of preset flow area on the said piston (3), said intermediate cavity (13) is communicated with said water intake (7) through said water conservancy diversion through hole (9).End towards said sealing seat of said piston (3) is provided with Sealing (4); At the flow of said water intake (7) during less than predefined value; Said Sealing (4) separates with said sealing seat, and said intermediate cavity (13) communicates with said water outlet through formed gap between said Sealing (4) and the said sealing seat; During greater than predefined value, said piston (3) moves towards said sealing seat direction under the promotion of hydraulic coupling at the flow of said water intake (7), and said Sealing (4) on said piston and said sealing seat contact seal block current;

Biasing member, said biasing member are arranged between the end and said sealing seat of said piston (3) near said cavity water intake (7);

Also comprise a block valve; The water outlet of said block valve (12) is communicated with the water intake (7) of said flow stop valve; When said block valve is closed; The reposition force sum of ambient pressure and said biasing member realizes resetting of said piston (3) greater than the hydraulic coupling between said block valve water outlet (12) and the said flow stop valve water intake (7).

2. flow restriction shutoff valve according to claim 1 is characterized in that, on said Sealing and the surface that said sealing seat contacts, two have at least one to be provided with protruding or recessed pattern or decorative pattern.

3. flow restriction shutoff valve according to claim 1 and 2; It is characterized in that; The water outlet of said flow stop valve (8) locates to be provided with the conversion adapter assembly (6) of a hollow; Said sealing seat is formed by the end that said conversion adapter assembly (6) inserts said water outlet (8), and said flow stop valve is connected with extraneous pipeline through said conversion adapter assembly (6).

4. according to claim 1 or 2 or 3 described flow restriction shutoff valves; It is characterized in that; Said piston (3) comprises head and the less afterbody of diameter that diameter is bigger, and said head is fit to slide along said cavity inwall, and said water conservancy diversion through hole (9) is molded over the head of said piston; Said Sealing (4) is arranged on the said afterbody.

5. flow restriction shutoff valve according to claim 4 is characterized in that, also is provided with an end on the end face of the said afterbody of said piston (3) and stretches into the guide rod (10) in the said conversion adapter assembly (6).

6. according to claim 3 or 4 described flow restriction shutoff valves; It is characterized in that; Said conversion adapter assembly (6) inserts on the end end face in the said cavity and also forms annular groove (11); Said biasing member is that an end is set in said piston (3) afterbody, and the other end is arranged on the spring (5) in the said groove (11).

7. flow restriction shutoff valve according to claim 1 is characterized in that, said block valve is ball valve (1).

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