阅读说明：本技术 一种止回方向可调的机械联动式逆止阀 (Non return direction adjustable mechanical linkage formula check valve ) 是由 杨叶莹 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种止回方向可调的机械联动式逆止阀,包括第一阀块与第二阀块,第一阀块与第二阀块面对面相抵安装,第一阀块与第二阀块均包括接口,两个接口作为逆止阀对外进出口,第一阀块包括第一阀芯,第二阀块包括第二阀芯,第一阀芯和第二阀芯具有流向相反的流道。通过两个阀块提供相反的流动通道；第一阀芯与第二阀芯受到各自的升降执行器驱动可以从阀腔内表面脱离一定的距离,从而构成从第一阀球到第二阀芯与阀腔之间的间隙的上进下出的流动方向或者第二阀球到第一阀芯与阀腔之间的间隙的下进上出的流动方向。(The invention discloses a mechanical linkage type check valve with adjustable check direction, which comprises a first valve block and a second valve block, wherein the first valve block and the second valve block are installed in a face-to-face abutting mode, the first valve block and the second valve block respectively comprise interfaces, the two interfaces are used as an external inlet and an external outlet of the check valve, the first valve block comprises a first valve core, the second valve block comprises a second valve core, and the first valve core and the second valve core are provided with flow channels with opposite flow directions. Providing opposing flow channels through the two valve blocks; the first valve core and the second valve core are driven by the respective lifting actuators to be separated from the inner surface of the valve cavity by a certain distance, so that the flow direction from the first valve ball to the upper part and the lower part of the gap between the second valve core and the valve cavity or the flow direction from the second valve ball to the lower part and the upper part of the gap between the first valve core and the valve cavity is formed.)

1. The utility model provides a non return direction adjustable mechanical linkage formula check valve which characterized in that: the mechanical linkage type check valve comprises a first valve block and a second valve block, wherein the first valve block and the second valve block are installed in a face-to-face abutting mode, the first valve block and the second valve block respectively comprise interfaces (11), the two interfaces (11) serve as an external inlet and an external outlet of the check valve, the first valve block comprises a first valve core (2), the second valve block comprises a second valve core (5), and the first valve core (2) and the second valve core (5) are provided with flow channels with opposite flow directions.

2. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 1, wherein: the first valve block further comprises a valve body (1) and a lifting actuator (3), a valve cavity (12) and a valve cavity flow passage (13) are arranged in the valve body (1), an interface (11) is arranged on the side face of the valve body (1), one end of the valve cavity (12) is directly connected with the second valve block, and the inner surface of the valve cavity (12) is connected to the interface (11) through the valve cavity flow passage (13);

the first valve core (2) comprises a core block (21), a ball cover (22) and a first valve ball (23), the core block (21) is located in the valve cavity (12), the ball cover (22) is arranged on one side, away from the inner surface end face of the valve cavity (12), of the core block (21), the first valve ball (23) is placed in the ball cover (22), a valve core flow passage (211) is arranged in the core block (21), one end of the valve core flow passage (211) is connected with the end face, facing the inner surface end face of the valve cavity (12), of the core block (21), one end of the valve core flow passage (211) is connected with the end face, facing the first valve ball (23), of the core flow passage (211) close to the first valve ball (23) and is provided with a conical inclined surface, and one end, close to the inner surface end face of the valve cavity (12;

the lifting actuator (3) is arranged on the outer surface of the valve body (1) and extends into the valve body (1) to be connected with the core block (21), and the lifting actuator (3) drives the core block (21) to move along the connecting line direction of the first valve block and the second valve block;

the second valve core (5) comprises a second valve ball (53), the shape and the connection relation of the second valve ball (53) and the first valve ball (23) are the same except for the whole density, the structure of the second valve block is that the first valve ball (23) in the first valve block is replaced by the second valve ball (53),

the integral density of the second valve ball (53) is greater than that of the first valve ball (23), the mechanical linkage type check valve is vertically arranged, the first valve block is arranged at the upper part, and the second valve block is arranged at the lower part.

3. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 2, wherein: the lifting actuator (3) comprises an electric actuating head (31) and a nut barrel (32), the core block (21) comprises a threaded column (212) and a guide column (213) which are arranged on the surface of the block body, a lifting actuating cavity (14) is arranged in the valve body (11), a guide hole (15) along the vertical direction is formed in the end face of the inner surface of the valve cavity (12), the guide column (213) is inserted into the guide hole (15), the threaded column (212) penetrates through the wall thickness of the valve body (1) and extends into the lifting actuating cavity (14), the electric actuating head (31) is installed on the outer surface of the valve body (1), the electric actuating head (31) is connected with the nut barrel (32) and drives the nut barrel to rotate, and the nut barrel (32) extends into the lifting actuating cavity (14) and is in threaded connection with the threaded column (212); first valve piece still includes pressure transmitter (4), pressure transmitter (4) set up in valve body (11) side and the gauge rod passes valve body (11) wall thickness and stretches into valve body runner (13), pressure transmitter (4) are connected with electronic execution head (31) electricity.

4. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 3, wherein: and a valve core sealing ring (91) is arranged on the outer ring of one end, close to the valve body flow passage (13), of the valve core flow passage (211), a post rod sealing ring (92) is arranged on a path of the threaded post (212) penetrating through the wall thickness of the valve body (11), and a valve block sealing ring (93) is arranged on the contact surface of the first valve block, which is opposite to the second valve block.

5. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 4, wherein: and a sealing ring groove of the valve core sealing ring (91) is a dovetail groove.

6. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 1, wherein: the interface (11) is a flange interface.

7. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 3, wherein: the lifting actuator (3) further comprises a hand wheel (33), and the hand wheel (33) is installed on a main shaft of the electric actuator head (31).

8. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 2, wherein: the first valve ball (23) and the second valve ball (53) are both provided with rubber layers on the outer surfaces.

9. The mechanical linkage type check valve with the adjustable check direction as claimed in claim 3, wherein: the head of the guide column (213) is conical.

Technical Field

The invention relates to the field of check valves, in particular to a mechanical linkage type check valve with adjustable check direction.

Background

Disclosure of Invention

The invention aims to provide a mechanical linkage type check valve with an adjustable check direction, which aims to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a non return direction adjustable mechanical linkage formula check valve, includes first valve piece and second valve piece, and first valve piece and the installation of face-to-face counterbalance of second valve piece, first valve piece and second valve piece all include the interface, and two interfaces are imported and exported as the check valve to the outside, and first valve piece includes first case, and the second valve piece includes the second case, and first case and second valve core have the opposite runner of flow direction.

The first valve block and the second valve block respectively provide a non-return characteristic in different flow directions, and different flow characteristics are provided according to different use working conditions, so that a bidirectional non-return selection function is realized on a single pipeline. When the process conditions or process steps are different and the medium in one container needs to be conveyed to the other container, the corresponding pump set is started, only one connecting pipeline in the middle needs to be used, when the medium in the container I flows to the container II, the pump set on the left side is started, the check valve is switched to the flow direction of the medium entering from the top to the bottom and is reversed to check, when the process is switched to the state that the medium in the container II needs to be reversed to flow back to the container I, at the moment, due to the change of the process conditions, the pressure of the container II is not enough to convey the medium back to the container I, the pump set on the right side is needed to carry out pressurized conveying, and the check valve is switched to the flow direction of the medium entering from the bottom.

The first valve block further comprises a valve body and a lifting actuator, a valve cavity and a valve cavity flow passage are arranged in the valve body, an interface is arranged on the side face of the valve body, one end of the valve cavity is directly connected with the second valve block, and the inner surface of the valve cavity is connected to the interface through the valve cavity flow passage;

the first valve core comprises a core block, a ball cover and a first valve ball, the core block is positioned in the valve cavity, the ball cover is arranged on one side of the core block, which is far away from the inner surface end face of the valve cavity, the first valve ball is placed in the ball cover, a valve core flow passage is arranged in the core block, one end of the valve core flow passage is connected with the end face of the core block, which faces the inner surface end face of the valve cavity, and the other end of the valve core flow passage is connected with the end face of the core block, which faces the first valve ball, a conical inclined surface is arranged at one end;

the lifting actuator is arranged on the outer surface of the valve body and extends into the valve body to be connected with the core block, and the lifting actuator drives the core block to move along the connecting line direction of the first valve block and the second valve block;

the second valve core comprises a second valve ball, the shape and the connection relation of the second valve ball and the first valve ball are the same except for the whole density, the second valve block has the structure that the first valve ball in the first valve block is replaced by the second valve ball,

the integral density of the second valve ball is greater than that of the first valve ball, the mechanical linkage type check valve is vertically placed, the first valve block is arranged above the second valve block.

The valve cavity and the valve cavity flow passage are flow passages of a medium in the valve, when the core block is attached to the inner surface of the valve cavity upwards, the medium in the valve cavity flow passage in the first valve block can only enter and exit from the first valve ball, and the first valve ball has smaller density which is at least smaller than the density of the medium under the working condition of use, so that the first valve ball can be floated by the medium, the medium in the first valve core can only jack the first valve ball from top to bottom to flow out of the first valve core, but can not flow into the valve cavity flow passage at the upper part through the first valve ball from bottom to top, the flow path can only be in an up-in-down-out mode, and at the moment, the second valve core of the valve can only be lifted upwards by a lower lifting actuator for a distance, because the second valve ball in the second valve core of the valve has higher density which is at least greater than the density of the medium under the working condition of use, namely, the second valve, the second valve ball falls on a core block of the second valve core to block the valve core flow passage, and the second valve core needs to be integrally jacked up for a distance, so that liquid in the valve enters the valve body flow passage at the lower part from a gap below the second valve core and then flows out of the valve from a connector at the lower part;

the valve is in a downward-in and upward-out mode under another condition, the lower second valve core falls to be attached to the inner surface of the upper valve cavity, the upper first valve core is ejected out by a certain distance, a gap between the first valve core and the inner surface of the valve cavity is exposed, when a medium flows, the medium enters the valve from the lower interface, then the second valve ball is ejected upwards, then the second valve ball bypasses the first valve core, enters the upper valve body flow channel from the gap, then flows out of the valve from the upper interface, when the medium flows reversely, the second valve ball falls to block the valve core flow channel in the second valve core, and meanwhile, the second valve core also blocks the gap flow channel below the second valve ball, so that no flow channel can allow the medium coming from the upper part to pass. The lifting actuator is used for respectively controlling the upper and lower positions of the first valve core and the second valve core and carrying out position adjustment under different conditions.

Furthermore, the lifting actuator comprises an electric actuating head and a nut barrel, the core block comprises a threaded column and a guide column which are arranged on the surface of the block body, a lifting actuating cavity is arranged in the valve body, a guide hole in the vertical direction is formed in the end face of the inner surface of the valve cavity, the guide column is inserted into the guide hole, the threaded column penetrates through the wall thickness of the valve body and extends into the lifting actuating cavity, the electric actuating head is arranged on the outer surface of the valve body, the nut barrel is connected below the electric actuating head and drives the nut barrel to rotate, and the nut barrel extends into the lifting actuating cavity and is in threaded connection with; the first valve block further comprises a pressure transmitter, the pressure transmitter is arranged on the side face of the valve body, the detection rod penetrates through the wall thickness of the valve body and extends into a flow channel of the valve body, and the pressure transmitter is electrically connected with the electric execution head.

The lifting actuator drives the core block to lift through the threads to form a screw thread pair structure of the screw rod, when the nut barrel is driven by the electric actuating head to rotate, the core block and the part of the guide post are inserted into the guide hole, so that the core block can not rotate around the central line of the nut barrel but is converted into lifting along the central line of the nut barrel, and the guide post plays a role in limiting the rotational freedom degree and plays a role in guiding to prevent the core block from deflecting in the lifting process.

The execution of the electric execution head needs to be controlled, if no pressure transmitter is arranged near an inlet/outlet-two interfaces of the invention, when the device condition changes, the electric execution head needs to carry out parameter setting from the outside, namely the height positions of the first valve core and the second valve core are manually changed through electric signals, and after the pressure transmitter is added, the effect of automatic identification can be achieved.

When the valve is in a cut-off state (namely the flowing pipeline is stopped, no medium flows between the first container and the second container), the first valve core and the second valve core are driven by the lifting actuator to be attached to the end face of the upper valve cavity, and then, when the medium is to be transported between the first and the second container again, for example, the flow direction is downward and upward in the present valve, the liquid entering the valve from below will be held back in the valve first, because the first valve core is not lowered to open the ascending channel, the liquid is suppressed to cause the pressure value obtained by the lower pressure transmitter to quickly ascend, therefore, the valve obtains an opening signal, the electric actuating head above the valve obtains the opening signal, the first valve core is driven to descend for a certain distance, the ascending channel is opened, and the check valve with the lower inlet and the upper outlet is formed. When the flow direction required by the outside is up-in and down-out, the operation logics of the four electrical appliances of the two groups of pressure transmitters and the electric execution head are opposite to the above.

Furthermore, a valve core sealing ring is arranged on the outer ring of one end, close to the valve body flow passage, of the valve core flow passage, a post rod sealing ring is arranged on a path of the threaded post penetrating through the wall thickness of the valve body, and a valve block sealing ring is arranged on a contact surface of the first valve block and the second valve block, which face each other. The valve core sealing ring is used for sealing a gap when the core block is attached to the inner surface of the valve cavity, the post rod sealing ring prevents a medium in the valve cavity from flowing into the lifting execution cavity, and the valve block sealing ring is used for sealing a contact surface after the two valve blocks are attached face to face. The valve core sealing ring prevents internal leakage, and the post rod sealing ring and the valve block sealing ring prevent external leakage.

Preferably, the sealing ring groove of the valve core sealing ring is a dovetail groove. When the valve core sealing ring is operated, the first valve core and the second valve core have a lifting process, the valve core sealing ring needs to be installed reliably at the installation position, and the dovetail groove type O-shaped ring groove prevents the sealing ring from falling.

Preferably, the interface is a flange interface. The flange interface is general.

As optimization, the lifting actuator also comprises a hand wheel which is arranged on a main shaft of the electric actuator head. The hand wheel is convenient for the outside personnel to manually operate.

Preferably, the first valve ball and the second valve ball are both provided with rubber layers on the outer surfaces. The rubber layer is soft, and the sealing performance is better after the rubber layer is attached to the conical inclined plane of the valve core runner on the core block.

Preferably, the head of the guide post is conical. When the first valve core is installed in the valve cavity, the first valve core needs to be rotated and aligned after the threaded column is inserted into the valve body, the valve core flow channel corresponds to the upper valve body flow channel, the guide column corresponds to the upper guide hole, the head of the guide column is conical, when the first valve core rotates to a position near a target position, the guide column is obviously inserted into the guide hole, and the assembly process of the valve is facilitated.

Compared with the prior art, the invention has the beneficial effects that: the invention provides opposite flow channels through the two valve blocks; the first valve core and the second valve core are driven by respective lifting actuators to be separated from the inner surface of the valve cavity by a certain distance, so that the flow direction from the first valve ball to the gap between the second valve core and the valve cavity in an up-in and down-out mode or the flow direction from the second valve ball to the gap between the first valve core and the valve cavity in an up-in and up-out mode is formed; the upstream and downstream relation of the flow direction can be obtained at the initial stage of liquid conveying on the flow passage by identifying the pressure values of the pressure transmitters at the two interfaces, so that the proper non-return direction is prepared.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic structural view of a first valve block of the present invention;

FIG. 2 is view A of FIG. 1;

FIG. 3 is a schematic structural view of a first valve cartridge of the present invention;

FIG. 4 is a schematic perspective view of a first valve cartridge of the present invention;

FIG. 5 is a schematic structural view of the present invention;

FIG. 6 is a schematic top-in-bottom flow diagram of the present invention;

FIG. 7 is a schematic flow diagram of the present invention from bottom to top;

FIG. 8 is a simplified structural schematic of the present invention;

fig. 9 is a schematic view of the connection of the present invention in use.

In the figure: 1-valve body, 11-interface, 12-valve cavity, 13-valve body flow channel, 14-lifting execution cavity, 15-guide hole, 2-first valve core, 21-core block, 211-valve core flow channel, 212-threaded column, 213-guide column, 22-ball cover, 221-water through hole, 23-first valve ball, 3-lifting actuator, 31-electric execution head, 32-nut barrel, 33-hand wheel, 4-pressure transmitter, 5-second valve core, 53-second valve ball, 91-valve core sealing ring, 92-post rod sealing ring and 93-valve block sealing ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 5, a mechanical linkage type check valve with adjustable check direction comprises a first valve block and a second valve block, wherein the first valve block and the second valve block are installed in a face-to-face abutting mode, the first valve block and the second valve block both comprise interfaces 11, the two interfaces 11 serve as an external inlet and an external outlet of the check valve, the first valve block comprises a first valve core 2, the second valve block comprises a second valve core 5, and the first valve core 2 and the second valve core 5 are provided with flow channels with opposite flow directions.

The first valve block and the second valve block respectively provide a non-return characteristic in different flow directions, and different flow characteristics are provided according to different use working conditions, so that a bidirectional non-return selection function is realized on a single pipeline. As shown in fig. 9, between the first and second remote containers, when the process conditions or process steps are different and the medium in one container needs to be sent to the other container, the corresponding pump set is started, only one connecting pipeline in the middle needs to be used, when the first container and the second container flow, the pump set on the left side is started, the check valve is switched to the flow direction of the upward flow and the downward flow and is reversely checked, when the process is switched to the state that the medium in the second container needs to be reversely flowed back to the first container, the pressure of the second container is insufficient to send the medium back to the first container due to the change of the process conditions, the pump set on the right side is needed to perform pressurized conveying, and the check valve is switched to the flow direction of the downward flow and the upward flow and is reversely.

As shown in fig. 1, the first valve block further includes a valve body 1 and a lifting actuator 3, a valve cavity 12 and a valve cavity flow passage 13 are arranged in the valve body 1, a port 11 is arranged on the side surface of the valve body 1, one end of the valve cavity 12 is directly connected to the second valve block, and the inner surface of the valve cavity 12 is connected to the port 11 through the valve cavity flow passage 13;

the first valve core 2 comprises a core block 21, a ball cover 22 and a first valve ball 23, the core block 21 is positioned in the valve cavity 12, the ball cover 22 is arranged on one side of the core block 21, which is far away from the inner surface end face of the valve cavity 12, the first valve ball 23 is placed in the ball cover 22, a valve core flow passage 211 is arranged in the core block 21, one end of the valve core flow passage 211 is connected with the end face of the core block 21, which faces the inner surface end face of the valve cavity 12, one end of the valve core flow passage 211 is connected with the end face, which faces the first valve ball 23, of the core block 21, one end of the valve core flow passage 211, which is close to;

the lifting actuator 3 is arranged on the outer surface of the valve body 1 and extends into the valve body 1 to be connected with the core block 21, and the lifting actuator 3 drives the core block 21 to move along the connecting line direction of the first valve block and the second valve block;

the second valve spool 5 includes a second valve ball 53, the second valve ball 53 having the same shape and connection relationship as the first valve ball 23 except for the overall density, and the second valve block is constructed such that the first valve ball 23 in the first valve block is replaced with the second valve ball 53,

the overall density of the second valve ball 53 is greater than that of the first valve ball 23, the mechanical linkage type check valve is vertically arranged, the first valve block is arranged above, and the second valve block is arranged below.

The valve cavity 12 and the valve cavity flow passage 13 are flow passages of media in the valve, when the core block 21 is attached to the inner surface of the valve cavity 12, the media in the valve cavity flow passage 13 in the first valve block can only enter and exit from the first valve ball 23, and the first valve ball 23 has a smaller density, which should be at least smaller than the density of the media under the operating condition, so that the first valve ball 23 will be floated by the media, and thus, in the first valve core 2, the media can only push the first valve ball 23 to flow out from the first valve core 2 from top to bottom, but cannot flow into the valve cavity flow passage 13 at the upper part from bottom to top over the first valve ball 23, and the flow path can only be in an up-in-down-out form as shown in fig. 6, at this time, the second valve core 5 should be lifted up by the lower lifting actuator 3 for a distance, because the second valve ball 53 in the second valve core 5 of this valve has a larger density, which should be at least greater than the density of the media under, that is, the second valve ball 53 cannot float upward, the second valve ball 53 falls on the pellet of the second valve core 5 to block the valve core flow channel, and the second valve core 5 needs to be lifted up by a certain distance, so that the liquid in the valve enters the lower valve body flow channel from the gap below the second valve core 5 and then flows out of the valve from the lower port 11;

the valve is in a downward-in-upward-out mode under another condition, as shown in fig. 7, the lower second valve core 5 is allowed to fall to be attached to the inner surface of the upper valve cavity, the upper first valve core 2 is ejected out by a certain distance, a gap between the first valve core 2 and the inner surface of the valve cavity 13 is exposed, when a medium flows, the medium enters the valve from the lower port 11, then the second valve ball 53 is ejected upward, and then the medium bypasses the first valve core 2 to enter the upper valve body flow channel 13 from the gap, and then flows out of the valve from the upper port 11, when the medium flows reversely, the second valve ball 53 falls down to block the valve core flow channel in the second valve core 5, and meanwhile, the second valve core 5 blocks the gap flow channel below the second valve core 5, so that no flow channel can allow the medium from the upper part. The lifting actuator 3 is used for controlling the upper and lower positions of the first valve core 2 and the second valve core 5 respectively, and position adjustment is carried out under different conditions.

As shown in fig. 1 ~ 4, the lifting actuator 3 includes an electric actuator 31 and a nut barrel 32, the core block 21 includes a threaded post 212 and a guide post 213 disposed on the surface of the block, a lifting actuator cavity 14 is disposed in the valve body 11, a guide hole 15 is disposed on the inner surface of the valve cavity 12 along the vertical direction, the guide post 213 is inserted into the guide hole 15, the threaded post 212 penetrates the wall thickness of the valve body 1 and extends into the lifting actuator cavity 14, the electric actuator 31 is mounted on the outer surface of the valve body 1, the electric actuator 31 is connected to the nut barrel 32 below and drives the nut barrel 32 to rotate, the nut barrel 32 extends into the lifting actuator cavity 14 and is in threaded connection with the threaded post 212, the first valve block further includes a pressure transmitter 4, the pressure transmitter 4 is disposed on the side of the valve body 11 and the detection rod penetrates the wall thickness of the valve body 11 and extends into the valve body flow passage 13, and the.

The lifting actuator 3 drives the core block 21 to lift through the screw thread to form a screw thread pair structure of the screw rod, when the nut cylinder 32 is driven by the electric actuator 31 to rotate, because the core block 21 and the part of the guide column 213 are inserted into the guide hole 15, the core block 21 can not rotate around the central line of the nut cylinder 32, but is converted into lifting along the central line of the nut cylinder 32, and the guide column 213 plays a role in limiting the rotational freedom degree, and plays a role in guiding to prevent the core block 21 from deflecting in the lifting process.

The execution of the electric execution head 31 needs to be controlled, if the pressure transmitter 4 near the inlet-outlet two interfaces 11 of the present invention is not provided, then when the device condition changes, the electric execution head 31 needs to perform parameter setting from the outside, that is, the height positions of the first valve core 2 and the second valve core 5 are changed artificially through electric signals, and after the pressure transmitter 4 is added, the effect of automatic identification can be achieved.

As shown in fig. 8, two sets of pressure transmitters 4 and electric actuator 31 are connected together by signal lines, when the valve is in a cut-off state (i.e. the flow pipe is stopped, no medium flows between the first container and the second container), the first valve core 2 and the second valve core 5 are both driven by the lifting actuator 3 to be attached to the end surface of the upper valve cavity, and then when medium transportation is required again between the first container and the second container, for example, the flow direction is downward in the valve and upward in the valve, the liquid entering the valve from below will be held in the valve first, because the first valve core 2 has not yet descended to open the ascending channel, the liquid is held in pressure, the pressure value obtained by the pressure transmitter 4 at the lower portion rises rapidly, so that the valve obtains an opening signal, and the electric actuator 31 above obtains an opening signal to drive the first valve core 2 to descend a distance, and opening the ascending channel to form a check valve with downward inlet and upward outlet. When the flow direction required by the outside is up-in and down-out, the operation logics of the two groups of pressure transmitters 4 and the electric actuating head 31 which are four electric appliances are opposite to the above.

As shown in fig. 2 ~ 5, a spool seal 91 is provided on the outer circumference of the spool flow passage 211 near the valve body flow passage 13, a post seal 92 is provided on the path of the threaded post 212 through the wall thickness of the valve body 11, a valve block seal 93 is provided on the contact surface of the first valve block and the second valve block, the spool seal 91 is used for sealing the gap when the core block 21 is attached to the inner surface of the valve cavity 13, the post seal 92 prevents the medium in the valve cavity 13 from flowing into the lift actuating cavity 14, and the valve block seal 93 is used for sealing the contact surface of the two valve blocks after face-to-face attachment, the spool seal 91 prevents inner leakage, and the post seal 92 and the valve block seal 93 prevent outer leakage.

The seal ring groove of the valve core seal ring 91 is a dovetail groove. When the valve operates, the first valve core 2 and the second valve core 5 have a lifting process, the valve core sealing ring 91 needs to be installed reliably at the installation position, and the dovetail groove type O-shaped ring groove prevents the sealing ring from falling.

The interface 11 is a flange interface. The flange interface is general.

The lifting actuator 3 further comprises a hand wheel 33, and the hand wheel 33 is mounted on the main shaft of the electric actuator head 31. The hand wheel 33 is convenient for the outside personnel to operate manually.

The first valve ball 23 and the second valve ball 53 are both provided with rubber layers on the outer surfaces. The rubber layer is soft, and the sealing performance is better after the rubber layer is attached to the conical inclined plane of the valve core flow passage 211 on the core block 21.

As shown in fig. 3, the head of the guide column 213 is conical. When the first valve core 2 is installed in the valve cavity 13, the threaded column 212 needs to be rotated and aligned after being inserted into the valve body 1, the valve core flow channel 211 corresponds to the upper valve body flow channel, the guide column 213 corresponds to the upper guide hole 15, the head of the guide column 213 is conical, when the first valve core is rotated to a position near a target position, the guide column 213 can be obviously inserted into the guide hole 15, and the assembly process of the valve is facilitated.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.