CN110260001A - A kind of spring loaded check valve - Google Patents

Abstract

The invention provides a spring check valve and relates to the technical field of pipeline valves. The spring check valve of the present invention includes a valve body, a valve core, a valve sleeve and a valve cover, the valve body is fixedly connected to the valve cover, the valve sleeve is slidingly connected to the valve cover, and the The valve core is connected with the valve sleeve; a first spring is provided between the valve sleeve and the valve cover, and a second spring is provided between the valve core and the valve sleeve; the valve core is located in the When the fluid inlet of the valve body is closed and the fluid inlet is closed, the check valve is in a closed state; when the valve core is separated from the valve body, and the first spring and the second spring are in a compressed state , the check valve is in an open state. The spring check valve of the present invention, through the setting of the first spring and the second spring, reduces the pressure drop of the spring check valve on the basis of ensuring that the spring check valve guides the flow direction and prevents flow diversion.

Description

A spring check valve

technical field

The invention relates to the technical field of pipeline valves, in particular to a spring check valve.

Background technique

In the technical field of pipeline valves, spring check valves are used to prevent the fluid in them from flowing backwards.

When the existing check valve is in use, due to the requirement of preventing fluid backflow, the pressure drop of the check valve is set to be relatively large to ensure the correct flow direction of the fluid, but this will cause the check valve to require an air inlet (liquid) end when in use. Only when the pressure is much higher than the outlet gas (liquid) end can the check valve be unblocked. When the pressure of the inlet (liquid) end is only slightly higher than the outlet gas (liquid) end, the check valve will often not open, which will seriously affect the check valve. normal use of the valve.

It can be seen that the structure of the existing check valve needs to be further improved.

Contents of the invention

The problem solved by the invention is that the pressure drop caused by the existing check valve structure is too high.

In order to solve the above problems, the present invention provides a spring check valve, which includes a valve body, a valve core, a valve sleeve and a valve cover, the valve body is fixedly connected to the valve cover, and the valve sleeve is fixed on the valve cover. Sliding inside; a first spring is provided between the valve sleeve and the valve cover, and a second spring is provided between the valve core and the valve sleeve; the valve core is located at the fluid inlet of the valve body And when the fluid inlet is closed, the check valve is in a closed state; when the valve core is separated from the valve body, and the first spring and the second spring are in a compressed state, the check valve is open.

The spring check valve of the present invention, through the setting of the first spring and the second spring, reduces the pressure drop of the spring check valve on the basis of ensuring that the spring check valve guides the flow direction and prevents flow diversion.

Optionally, the check valve includes an opening pressure P1, and the opening pressure P1 is controlled by the first spring; when the pressure at the intake end is lower than the opening pressure P1, the check valve is in a closed state ; When the inlet port pressure is greater than or equal to the cracking pressure P1, the switching state of the check valve is controlled by the second spring.

The spring check valve of the present invention sets a minimum value for the pressure at the intake end by setting the cracking pressure controlled by the first spring. When the pressure at the intake end does not reach the minimum value, the check valve is always at Closed state, and then realize the opening pressure control of the check valve.

Optionally, the opening pressure P1 is between 300-900kpa.

In the spring check valve of the present invention, by setting the cracking pressure of the check valve in the range of 300-900kpa, the cracking pressure is controlled by the first spring, thereby realizing the control of the cracking pressure of the check valve.

Optionally, the second spring controls the magnitude of the differential pressure P2; when the pressure difference between the inlet end and the outlet end is greater than the differential pressure P2, the check valve is in an open state; when the inlet When the pressure difference between the gas end and the gas outlet is less than or equal to the differential pressure P2, the check valve is in a closed state.

The spring check valve of the present invention, the spring check valve of the present invention, by setting the differential pressure controlled by the second spring, is conducive to the reduction of the pressure difference between the inlet and outlet gas ends when the check valve is opened, In turn, it is beneficial to improve the sensitivity of the check valve.

Optionally, the differential pressure P2 is in the range of 1-10kpa.

The spring check valve of the present invention, the spring check valve of the present invention, by setting the differential pressure in the range of 1-10kpa, the differential pressure is controlled by the second spring, so that the check valve can be controlled by the air in and out. The opening process under the small pressure difference at the end.

Optionally, a guide ring and a sealing ring are provided between the valve sleeve and the valve cover; the guide ring is located on the side wall of the valve sleeve, and the guide ring is suitable for controlling the sliding of the valve sleeve direction; the sealing ring is located on the side wall of the valve sleeve, and the sealing ring is suitable for restricting the flow direction of the fluid.

The spring check valve of the present invention improves the smoothness of the valve sleeve sliding in the valve cover by setting the guide ring and the sealing ring, and at the same time avoids the circulation of the air inlet and outlet and the space above the valve sleeve when the valve sleeve slides. The tightness of the check valve is improved.

Optionally, a first sealing ring is provided between the valve body and the valve cover, and the first sealing ring is suitable for restricting the flow direction of the fluid.

The spring type check valve of the present invention improves the sealing performance of the check valve by providing a first sealing ring between the valve body and the valve cover.

Optionally, the first spring is connected with a spring seat, and when the first spring elastically moves, the spring seat remains fixed.

In the spring check valve of the present invention, the opening pressure of the check valve is adjusted by setting the spring seat connected to the first spring and adjusting the position of the spring seat.

Optionally, the spring seat is connected with a pressure adjusting nut, and the pressure adjusting nut is suitable for controlling the position of the spring seat in the check valve.

The spring check valve of the present invention, the spring check valve of the present invention, by setting the pressure adjustment nut connected with the spring seat, by adjusting the pressure adjustment nut to adjust the relative position of the spring seat in the check valve, Then adjust the opening pressure of the check valve.

Optionally, the valve core is connected with a second sealing ring, and when the valve core is connected with the valve body, the second sealing ring is suitable for preventing fluid flow between the inlet end and the outlet end.

The spring check valve of the present invention, the spring check valve of the present invention, the safety performance of the check valve is improved by setting the second sealing ring on the valve core.

Description of drawings

Fig. 1 is the schematic sectional view of spring type check valve of the present invention;

Fig. 2 is the schematic diagram that the valve sleeve of the present invention cooperates with surrounding components;

Fig. 3 is a schematic side view of the spring check valve of the present invention.

Explanation of reference signs:

1-valve body, 2-spool, 3-valve sleeve, 4-bonnet, 5-first spring, 6-second spring, 7-guide ring, 8-sealing ring, 9-spring seat, 10-pressure Adjusting nut, 11-first sealing ring, 12-second sealing ring, 13-third sealing ring, 100-fluid inlet.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

For the convenience of description, in the present invention, the inlet end and the liquid inlet end are collectively referred to as the inlet end, and the gas outlet end and the liquid outlet end are collectively referred to as the gas outlet end, that is, the spring check valve of the present invention is used for the directional conduction of gas and liquid. .

As shown in Figure 1, the present invention provides a spring check valve, comprising a valve body 1, a valve core 2, a valve sleeve 3 and a valve cover 4, the valve body 1 is fixedly connected to the valve cover 4, the The valve sleeve 3 slides in the valve cover 4; a first spring 5 is provided between the valve sleeve 3 and the valve cover 4, and a second spring is provided between the valve core 2 and the valve sleeve 3 6; when the valve core 2 is located at the fluid inlet 100 of the valve body 1 and closes the fluid inlet 100, the check valve is in a closed state; the valve core 2 is separated from the valve body 1, and When the first spring 5 and the second spring 6 are in a compressed state, the check valve is in an open state.

Specifically, the spring check valve of the present invention includes a valve body 1 and a valve cover 4 that are fixedly connected. The valve body 1 and the valve cover 4 constitute the main body of the spring check valve. The valve core 2 and the valve sleeve 3 Located inside the spring check valve, the valve core 2 is connected to the valve sleeve 3, and the valve sleeve 3 is slidingly connected to the valve cover 4; a first spring 5 is arranged between the valve sleeve 3 and the valve cover 4, and the valve sleeve 3 is in the spring The reciprocating movement inside the spring check valve is accompanied by the compression and elongation of the first spring 5, while the valve core 2 is connected to the valve sleeve 3, and the valve core 2 is located between the inlet and outlet ends of the spring check valve. The switching state of the spring check valve is controlled by the first spring 5. When the pressure at the inlet end is less than the elastic force of the first spring 5 and the sum of the gravity of the valve core 2 and the valve sleeve 3, the check valve is always in the closed state. The spool 2 is connected to the valve body 1. The spool 2 is located at the fluid inlet 100 of the valve body 1 and closes the fluid inlet 100. The fluid at the inlet end and the outlet end cannot be connected; the check valve must meet the pressure of the inlet end when it is in an open state. Greater than or equal to the elastic force of the first spring 5 and the sum of the gravity of the valve core 2 and the valve sleeve 3, and the pressure at the inlet end is greater than the sum of the pressure at the outlet end and the elastic force of the second spring 6. At this time, the check valve is in an open state, and the valve core 2 is separated from the valve body 1, and the first spring 5 and the second spring 6 are in a compressed state. When the check valve is in an open state, the valve core 2 is separated from the valve body 1. Since the pressure at the inlet end is greater than the pressure at the outlet end, the valve core 2 is separated from the valve body 1. The fluid at the gas end such as gas, water, etc. flows to the gas outlet, whereas the fluid at the gas outlet will not flow back to the inlet.

Compared with the situation that the pressure drop of the existing check valve is too high, the present invention reduces the pressure drop by setting the first spring 5 and the second spring 6, wherein the first spring 5 is the same as the existing spring check valve. The functions of the springs in the springs are the same, and the focus of the present invention is the setting of the second spring 6, so that when the pressure at the intake end is greater than or equal to the elastic force of the first spring 5 and the sum of the gravity of the valve core 2 and the valve sleeve 3, only the intake end pressure is required. The pressure should be slightly higher than the outlet pressure.

The spring check valve of the present invention, through the setting of the first spring and the second spring, reduces the pressure drop of the spring check valve on the basis of ensuring that the spring check valve guides the flow direction and prevents flow diversion.

Optionally, the check valve includes a cracking pressure P1, and the size of the cracking pressure P1 is controlled by the first spring 5; when the pressure at the intake end is lower than the cracking pressure P1, the check valve is closed State: when the pressure at the inlet port is greater than or equal to the opening pressure P1, the switch state of the check valve is controlled by the second spring 6 .

Specifically, the opening pressure P1 depends on the elastic force of the first spring 5, and the sum of the gravity of the valve core 2 and the valve sleeve 3, wherein the valve core 2 and the valve sleeve 3 have been determined in the production design process, and the main force is the first A spring 5 determines the cracking pressure P1. When the pressure at the inlet end is lower than the cracking pressure P1, the check valve is always in the closed state. At this time, the valve core 2 is connected to the valve body 1, and the fluid at the inlet end and the outlet end No conduction; when the pressure at the inlet end is greater than or equal to the opening pressure P1, the check valve can be opened, but further opening is required to be controlled by the second spring 6, when the pressure difference between the inlet end and the air outlet end is greater than the elastic force of the second spring 6 When the sum of the gravity of the second spring 6 and the gravity of the spool 2, the check valve is in the open state, when the pressure difference between the inlet and outlet ends is less than or equal to the sum of the elastic force of the second spring 6 and the gravity of the spool 2, the check valve is in the closed state . In this embodiment, by setting the opening pressure P1, a minimum value is set for the pressure at the intake end, and when the pressure at the intake end does not reach the minimum value, the check valve is always closed.

The spring check valve of the present invention sets a minimum value for the pressure at the intake end by setting the cracking pressure controlled by the first spring. When the pressure at the intake end does not reach the minimum value, the check valve is always at Closed state, and then realize the opening pressure control of the check valve.

Optionally, the opening pressure P1 is between 300-900kpa.

Specifically, the value range of the opening pressure P1 is 300-900kpa. Preferably, the opening pressure P1 is taken as 600kpa, that is, when the pressure at the inlet end is less than 600kpa, the check valve is always closed, and when the pressure at the inlet end is greater than or equal to At 600kpa, the check valve can be opened. When the pressure difference between the inlet end and the outlet end is greater than the sum of the elastic force of the second spring 6 and the gravity of the valve core 2, the check valve is in an open state. When the pressure difference between the inlet end and the outlet end When the difference is less than or equal to the sum of the elastic force of the second spring 6 and the gravity of the valve core 2, the check valve is in the closed state. The value of the opening pressure P1 is controlled by the first spring 5 to realize the opening pressure control of the check valve. The first spring 5 also acts as a safety valve, and a minimum opening value is set for the opening of the check valve. When the pressure is less than the opening value, the check valve is always closed. It should be noted that the value of the opening pressure P1 can be changed according to actual needs.

In the spring check valve of the present invention, by setting the cracking pressure of the check valve in the range of 300-900kpa, the cracking pressure is controlled by the first spring, thereby realizing the control of the cracking pressure of the check valve.

Optionally, the second spring 6 controls the magnitude of the differential pressure P2; when the pressure difference between the inlet end and the outlet end is greater than the differential pressure P2, the check valve is in an open state; when the When the pressure difference between the inlet end and the outlet end is less than or equal to the differential pressure P2, the check valve is in a closed state.

Specifically, the magnitude of the differential pressure P2 depends on the sum of the elastic force of the second spring 6 and the gravity of the spool 2, wherein the gravity of the spool 2 has been determined in the production design process, and it is mainly the second spring 6 that determines the differential pressure. The size of the pressure P2; when the pressure at the inlet end is greater than the opening pressure P1, when the pressure difference between the inlet end and the outlet end is greater than the differential pressure P2, the check valve is in an open state, when the pressure at the inlet end and the outlet end When the difference is less than or equal to the differential pressure P2, the check valve is in a closed state. In this embodiment, by setting the differential pressure P2 controlled by the second spring 6, compared with the larger pressure drop of the check valve in the prior art, the pressure at the inlet end only needs to be slightly higher than the pressure at the outlet end. Therefore, the setting of the differential pressure P2 controlled by the second spring 6 is conducive to reducing the differential pressure of the check valve, and further to improving the sensitivity of the check valve.

The spring-type check valve of the present invention, by setting the differential pressure controlled by the second spring, is beneficial to reduce the pressure difference between the inlet and outlet gas ends when the check valve is opened, and further helps to improve the sensitivity of the check valve.

Optionally, the differential pressure P2 is in the range of 1-10kpa.

Specifically, the value range of the differential pressure P2 is 1-10kpa. Preferably, the differential pressure P2 is 5kpa. When the pressure difference between the gas end and the gas outlet is less than or equal to 5kpa, the check valve is closed. Among them, the ratio of the differential pressure P2 to the cracking pressure P1 is very small, and the value of the differential pressure P2 is controlled by the second spring 6 to realize the opening process of the check valve under the small pressure difference between the inlet and outlet gas ends. It should be noted that the value of the differential pressure P2 can be changed according to actual needs.

The spring-type check valve of the present invention realizes the opening process of the check valve under the slight pressure difference between the inlet and outlet gas ends by setting the differential pressure within the range of 1-10kpa, and the differential pressure is controlled by the second spring.

Optionally, a guide ring 7 and a sealing ring 8 are provided between the valve sleeve 3 and the valve cover 4; the guide ring 7 is located on the side wall of the valve sleeve 3, and the guide ring 7 is suitable for Control the sliding direction of the valve sleeve 3; the sealing ring 8 is located on the side wall of the valve sleeve 3, and the sealing ring 8 is suitable for restricting the flow direction of the fluid.

Specifically, as shown in FIG. 1 and FIG. 2, a guide ring 7 is provided on the side wall of the valve sleeve 3, specifically in a circle of grooves formed by invading the side wall of the valve sleeve 3. The guide ring 7 not only serves as a valve The guiding effect of the sleeve 3 when sliding can also reduce the friction between the valve sleeve 3 and the valve cover 4 when sliding; a sealing ring 8 is arranged on the side wall of the valve sleeve 3, and is specifically arranged on a recess formed by the side wall of the valve sleeve 3. In the ring groove, the sealing ring 8 not only prevents the circulation of the air inlet and outlet and the space above the valve sleeve 3, but also reduces the friction between the valve sleeve 3 and the valve cover 4 when the valve sleeve 3 slides. Preferably, the inner side of the sealing ring 8 is set The third sealing ring 13, the sealing ring 8 and the third sealing ring 13 jointly play the role of preventing circulation and reducing friction. It should be noted that the sleeve end nuts are arranged above the sealing ring 8 and the third sealing ring 13 , which is beneficial to the assembly process of the sealing ring 8 and the third sealing ring 13 .

The spring check valve of the present invention improves the smoothness of the valve sleeve sliding in the valve cover by setting the guide ring and the sealing ring, and at the same time avoids the circulation of the air inlet and outlet and the space above the valve sleeve when the valve sleeve slides. The tightness of the check valve is improved.

Optionally, a first sealing ring 11 is provided between the valve body 1 and the valve cover 4, and the first sealing ring 11 is suitable for restricting the flow direction of the fluid.

Specifically, as shown in FIG. 1, a first sealing ring 11 is provided between the valve body 1 and the valve cover 4, and the first sealing ring 11 is used to block the gap between the valve body 1 and the valve cover 4, so that the intake air The fluid at the end can only flow to the outlet end, thus improving the sealing performance of the check valve.

The spring type check valve of the present invention improves the sealing performance of the check valve by providing a first sealing ring between the valve body and the valve cover.

Optionally, the first spring 5 is connected with a spring seat 9, and when the first spring 5 elastically moves, the spring seat 9 remains fixed.

Specifically, the first spring 5 is connected with the spring seat 9, and when the first spring 5 elastically reciprocates, the spring seat 9 remains fixed; the cracking pressure P1 of the check valve not only depends on the manufacturing material of the first spring 5 itself, but also Related to the position of the spring seat 9 , the elastic force of the first spring 5 can be adjusted by adjusting the position of the spring seat 9 , thereby adjusting the cracking pressure P1 of the check valve.

In the spring check valve of the present invention, the opening pressure of the check valve is adjusted by setting the spring seat connected to the first spring and adjusting the position of the spring seat.

Optionally, the spring seat 9 is connected with a pressure adjusting nut 10, and the pressure adjusting nut 10 is suitable for controlling the position of the spring seat 9 in the check valve.

Specifically, as shown in Figures 1-3, a pressure adjustment nut 10 is provided above the spring seat 9. By adjusting the pressure adjustment nut 10, the relative position of the spring seat 9 in the check valve can be adjusted, thereby adjusting the cracking pressure. P1. Preferably, a pressure scale is set on the pressure adjustment nut 10, and in the production design process and other situations where the cracking pressure P1 needs to be adjusted, the pressure adjustment nut 10 is adjusted to the target position according to the pressure value on the pressure scale, so that the pressure adjustment nut 10 can be adjusted according to It is actually necessary to select the corresponding opening pressure P1.

The spring check valve of the present invention adjusts the relative position of the spring seat in the check valve by setting the pressure adjusting nut connected with the spring seat, thereby adjusting the opening pressure of the check valve.

Optionally, the valve core 2 is connected with a second sealing ring 12, and when the valve core 2 is connected with the valve body 1, the second sealing ring 12 is suitable for preventing fluid flow.

Specifically, as shown in FIG. 1 and FIG. 2, a second sealing ring 12 is provided on the valve core 2. When the valve core 2 is connected to the valve body 1, the second sealing ring 12 prevents the air inlet and outlet ports from The role of fluid flow between, thereby improving the safety performance of the check valve.

The spring type check valve of the present invention improves the safety performance of the check valve by setting the second sealing ring on the valve core.

Although the disclosure of the present invention is as above, the protection scope of the disclosure of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims (10)

1. A spring check valve, characterized in that it comprises a valve body (1), a spool (2), a valve sleeve (3) and a valve cover (4), the valve body (1) and the valve The cover (4) is fixedly connected, and the valve sleeve (3) slides in the valve cover (4); A first spring (5) is provided between the valve sleeve (3) and the valve cover (4), and a second spring (6) is provided between the valve core (2) and the valve sleeve (3). ); When the valve core (2) is located at the fluid inlet (100) of the valve body (1) and closes the fluid inlet (100), the check valve is in a closed state; When the valve core (2) is separated from the valve body (1), and the first spring (5) and the second spring (6) are in a compressed state, the check valve is in an open state. 2. The spring check valve according to claim 1, characterized in that, the check valve includes a cracking pressure P1, and the size of the cracking pressure P1 is controlled by the first spring (5); When the pressure at the intake end is less than the opening pressure P1, the check valve is in a closed state; When the pressure at the inlet port is greater than or equal to the opening pressure P1, the switching state of the check valve is controlled by the second spring (6). 3. The spring check valve according to claim 2, wherein the cracking pressure P1 is between 300-900kpa. 4. The spring check valve according to claim 2, characterized in that, the second spring (6) controls the magnitude of the differential pressure P2; When the pressure difference between the inlet end and the outlet end is greater than the differential pressure P2, the check valve is in an open state; When the pressure difference between the inlet port and the outlet port is less than or equal to the differential pressure P2, the check valve is in a closed state. 5. The spring check valve according to claim 4, wherein the differential pressure P2 is in the range of 1-10kpa. 6. The spring check valve according to claim 1, characterized in that, a guide ring (7) and a sealing ring (8) are provided between the valve sleeve (3) and the valve cover (4); The guide ring (7) is located on the side wall of the valve sleeve (3), and the guide ring (7) is suitable for controlling the sliding direction of the valve sleeve (3); The sealing ring (8) is located on the side wall of the valve sleeve (3), and the sealing ring (8) is suitable for restricting the flow direction of fluid. 7. The spring check valve according to claim 1, characterized in that, a first sealing ring (11) is provided between the valve body (1) and the valve cover (4), and the first The sealing ring (11) is adapted to restrict the flow direction of the fluid. 8. The spring check valve according to claim 2, characterized in that, the first spring (5) is connected with a spring seat (9), and when the first spring (5) performs elastic movement, the The spring seat (9) remains fixed. 9. The spring check valve according to claim 8, characterized in that, the spring seat (9) is connected with a pressure adjusting nut (10), and the pressure adjusting nut (10) is suitable for controlling the spring seat (9) Position in the check valve. 10. The spring check valve according to claim 1, characterized in that, the valve core (2) is connected with a second sealing ring (12), when the valve core (2) and the valve body ( 1) When connected, said second sealing ring (12) is adapted to prevent fluid flow between the inlet and outlet ports.