JP3482745B2 - Control valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to various oils,
The present invention relates to a control valve used for controlling a pneumatic device or the like, and particularly to a structure of a so-called poppet type valve body in which a valve body comes into contact with or separates from a valve seat. 2. Description of the Related Art FIG. 2 shows an example of a conventional control valve of this type. That is, this control valve is a so-called poppet type that opens and closes a flow path that opens and closes the valve seat by bringing the valve body into and away from the valve seat, and has a configuration of a solenoid valve that drives the valve body by a solenoid. The solenoid valve 100 comprises a solenoid 101 and a valve body 102.
02 is provided integrally with the solenoid 101. The solenoid 101 has a hollow solenoid body 103, a plunger 104, which is a movable member as a valve made of a magnetic material, which is slidably inserted into the hollow interior of the solenoid body 103, and faces the plunger 104. And a center plate 105 as a fixing member made of a magnetic material and provided coaxially. [0005] The center plate 105 is provided with the plunger 1.
04 has a cylindrical portion 105A facing the outer peripheral end face, and has a case 10 of the solenoid body 103 at one end.
6 has a flange portion 105B extending radially outward so as to abut on the inner surface thereof. [0006] The center plate 105 is used for the valve body 1.
02. The valve body 102 has a valve seat 107 with which the plunger 104 comes in contact with and separates from the valve seat 107, and a flow passage 10 that opens in the valve seat 107 formed on the central axis of the valve body 102.
8, a holding portion 110 for holding a coil spring 109 as urging means for urging the plunger 104 away from the valve seat 107, and first and second inflow / outflow ports 111 communicating with the flow path 108 and the outside. , 112. [0007] The valve seat 107 is provided on the inner peripheral portion of the cylindrical portion 105A of the center plate 105.
A slightly protrudes toward the plunger 104 side from the end face of A. The first inflow / outflow port 111 is connected to the valve body 102
5 is provided on the lower surface in the figure so as to open on the central axis, and is provided continuously with the flow path 108 opening to the valve seat 107. In addition, a radially outer side of the flow path 108 has an annular recess 113 that extends in the axial direction and is formed all around.
Extending radially outward near the back end of the annular concave portion 113,
A second inflow / outflow port 112 is provided so as to open to the outside. That is, the flow path 108 and the second inflow / outflow port 112 are communicated with the hollow interior of the solenoid body 103 via the annular recess 113. [0009] Then, the coil spring 109 is inserted into the annular recess 113, and the bottom surface of the annular recess 113 forms a holding portion 110 of the coil spring 109. The solenoid valve 1 constructed as described above
00 indicates that the spring force of the coil spring 109 and the plunger 104 of the solenoid 101 correspond to the center plate 1.
The plunger 104 with the electromagnetic attraction to the valve seat 10
7 by opening and closing the flow path 108 by contacting with and separating from the flow path 7.
Through the first inflow / outflow port 111 and the second inflow / outflow port 1
It opens and closes the flow of fluid between the twelve. This solenoid valve 100 is
The mating member 1 as shown in FIG.
It is used by being inserted into 14 mounting holes 114A. At this time, when a seal is required between the first and second inflow / outflow ports 111 and 112 of the valve body 102 between the outer periphery of the valve body 102 and the inner periphery of the mounting hole 114A, a seal member is provided. Sealing is performed by the O-ring 115. In addition, molding of the valve main body 102 with a resin or the like has facilitated manufacturing. From these,
In order to enhance the sealing between the first and second inflow / outflow ports 111 and 112, the mounting hole 114A of the mating attachment member 114 has a stepped shape, and there is a disadvantage that the machining of the mating attachment member 114 becomes difficult. The mounting hole 11 of the mating mounting member 114 is
In order to simplify the shape of 4A, a method is often adopted in which the mounting hole 114A is made straight (straight) and a clearance seal is formed between the mounting hole 114A and the valve body 102. However, when performing the clearance seal, it is necessary to severely restrict the outer diameter tolerance of the valve body 102 for performing the clearance seal. Thereby, the valve body 10
In the case where 2 is made of resin, a metal valve sleeve or the like is insert-molded on the outer peripheral portion of the valve main body 102 in order to suppress the outer diameter tolerance severely, and the outer diameter tolerance of the valve main body 102 is secured. . As an example of this, there is a solenoid valve 200 shown in FIG. This solenoid valve 200 has a valve body 202 formed of a resin with a metal valve sleeve 201 inserted therein and attached to a solenoid 203. The solenoid 203 includes a hollow solenoid body 203A, a plunger 204 which is a movable member as a valve made of a magnetic material, which is slidably inserted into the hollow interior of the solenoid body 203A, and a coaxial shaft with the plunger 204. And a center plate 205 as a fixing member made of a magnetic material. The center plate 205 has a washer shape, and the valve body 202 is inserted through the hole into the hollow interior of the solenoid body 203A. Fixed. The valve body 202 comprises a cylindrical valve sleeve 201 and a resin portion 206 provided on the inner periphery thereof over substantially the entire length. The valve sleeve 201 is provided with first and second inflow / outflow ports 207 and 208 which are formed in the lower side in the figure at a predetermined interval in the axial direction and penetrate in the radial direction. The first
The inflow / outflow port 207 is on the lower side. On the other hand, the resin portion 206 is
And a flow passage 210 formed in the valve seat 209 formed on the central axis of the valve body 202, and a biasing means for biasing the plunger 204 in a direction away from the valve seat 209. And a holding part 212 for holding the coil spring 211. The outer diameter of the valve seat 209 is stepped, and the plunger 204 side is smaller than the inner diameter of the valve sleeve 201, and slightly protrudes from the upper end surface of the valve sleeve 201 toward the plunger 204. The small diameter portion 209A of the valve seat 209 extends from the second axial outflow / inflow port 208 to the lower side in the figure. The small diameter portion 209A and the valve sleeve 20
An annular gap 213 extending all around the circumference extends in the axial direction to below the second inflow / outflow port 208. The coil spring 211 is inserted into the annular gap 213, and the step surface of the small diameter portion 209A of the valve seat 209 is
Thus, 11 holding portions 212 are formed. The other end of the coil spring 211 is connected to the plunger 204.
Is in contact with the end face of Since the annular gap 213 extends below the second inflow / outflow port 208, the second inflow / outflow port 208 and the flow path 210 communicate with the hollow interior of the solenoid body 203A through the annular gap 213. Is done. The large-diameter portion 209B of the valve seat 209 is inserted and fixed to the inner peripheral surface of the valve sleeve 201 in a liquid-tight manner, and its lower end surface is substantially flush with the lower end surface of the valve sleeve 201. The opening is closed. The large diameter portion 209B has a first inflow / outflow port 20 provided in the valve sleeve 201.
7 has a passage 214 formed radially therethrough, and this passage 214 is provided in the flow passage 2 opening in the valve seat 209.
It communicates with 10. From this, the first
The inflow / outflow port 207 and the second inflow / outflow port 208 communicate with each other through the passage 214, the flow passage 210, the hollow interior of the solenoid body 203 </ b> A, and the annular gap 213. The solenoid valve 2 constructed as described above
00 indicates that the spring force of the coil spring 211 and the plunger 204 of the solenoid 203 correspond to the center plate 2.
The plunger 204 comes into contact with and separates from the valve seat 209 by electromagnetic attraction to the valve sleeve 201 through the
By opening and closing 0, the flow of fluid between the first inflow / outflow port 207 and the second inflow / outflow port 208 is opened and closed via the flow path 210. Then, this solenoid valve 200
Since the outer circumference of the valve body 202 is straight with the valve sleeve 201, the mounting hole 215A as shown in FIG. 3C is mounted on the straight mating mounting member 215, and the first inflow / outflow port is provided. 207 and the second inflow / outflow port 208, the valve body 202 and the mounting hole 215A
Seals the clearance. By the way, in the above-described conventional solenoid valve 200, the valve body 2
Numeral 02 is molded of resin with the valve sleeve 201 inserted. At this time, in order to fix the valve sleeve 201 to be inserted and the resin portion 206, the cylinder shown in Japanese Utility Model Application Laid-Open No. 3-12072 is used as the valve sleeve 201, and the spacer is used as the resin portion 206. Grooves and the like are provided to prevent the 201 from coming off and turning around. That is, between the lower end surface of the valve sleeve 201 and the first inflow / outflow port 207 and between the first inflow / outflow port 20
A groove 216 is provided between each of the first and second outlet ports 208, and a resin is inserted into the groove 216 during molding to prevent the valve sleeve 201 from coming off and rotating. As described above, the metal valve sleeve 20
In this case, the groove 216 needs to be processed on the inner peripheral surface of the valve sleeve 1, and there is a problem that the processing of the valve sleeve 201 becomes difficult. The present invention has been made to solve the above-mentioned problems of the prior art.
The valve sleeve can be inserted to prevent the valve body from slipping out and rotating during molding with resin while securing the valve seat, the flow path opened to the valve seat, and the holding portion of the urging means for urging the valve element. An object of the present invention is to provide a control valve capable of facilitating processing of a valve sleeve. In order to achieve the above object, according to the present invention, there is provided a valve body, a valve seat to which the valve body comes into contact with and separates from, and a flow passage opening to the valve seat. And extending radially from the flow path
A resin portion comprising a passage that, first provided by an axial spacing which communicates with said passageway and the outside, the second inflow and outflow ports
A valve body comprising: a cylindrical metal valve sleeve provided ; a biasing means holding portion for biasing means for biasing the valve body in a direction away from the valve seat; and a biasing means holding the valve body. Urging means for holding the valve body in a direction away from the valve seat, and driving means for driving the valve body to contact the valve seat against the urging force of the urging means And
The valve body is mounted in a mounting hole of a mating mounting member to seal between the first and second inflow / outflow ports, and the driving means and the urging means move the valve body toward and away from the valve seat by the urging means. A control valve that opens and closes a flow path that opens to a valve seat communicating between the first and second inflow / outflow ports.
At least one of the ports
The resin portion has an outer diameter of a part of the resin portion,
Port so that it is larger than the inside diameter of the
It is characterized by being wrapped around . In the control valve having the above configuration, the outer peripheral portion of the valve body is a metal valve sleeve having first and second inflow / outflow ports. Thereby, since the outer periphery of the valve body is straight, the mounting hole of the mating member can be straightened, and the machining of the mating member becomes easy. Further, since the valve sleeve is made of metal, the outer diameter tolerance can be strictly secured, the clearance seal with the mounting hole can be reliably performed, and the seal between the first and second inflow / outflow ports can be reliably performed. [0033] Then, first, at least one of the inflow and outflow ports smell of second inflow and outflow ports of the valve sleeve
The outer diameter of a part of the resin part is equal to the valve thread.
One of the inlet and outlet ports so as to be larger than the inside diameter of the
Wrap around . Accordingly, the valve sleeve does not come off or rotate during molding. As described above, in order to prevent the valve sleeve from coming off and turning around , the resin flows around the inflow / outflow port so as to go around.
Since it is only necessary to increase the size of the access port , the processing of the valve sleeve is easy. In addition, since the processing only makes the diameter of the inflow / outflow port of the valve sleeve larger than the required diameter, the valve seat formed of resin, which is another component of the valve body, opens to the valve seat. The holding portion of the urging means for urging the flow path and the valve body is not affected at all. Embodiments of the present invention will be described below with reference to the illustrated embodiments. In FIG. 1 showing a control valve according to an embodiment of the present invention, reference numeral 1 denotes a control valve which opens and closes a valve body to a first and a second valve seat and separates the valve body from the first and a second valve seat. 1 shows a so-called poppet type three-way valve that opens and closes first and second flow paths, and shows an entire solenoid valve that drives a valve body by a solenoid. The solenoid valve 1 includes a solenoid 2 and
And a valve body 3 which is integrally assembled coaxially with the solenoid 2. The solenoid 2 has a hollow solenoid body 4, a plunger 5 which is a movable member as a valve made of a magnetic material and is slidably inserted into the hollow interior of the solenoid body 4, and is coaxial with the plunger 5. And a center plate 6 which is a fixing member made of a magnetic material. The solenoid body 4 is open at both ends, and has a flange 71 at one end extending radially inward.
And a coil 9 wound around a hollow bobbin 8 housed in a case 7, a closing portion 10 for closing an open end opposite to a flange portion 71 in the case 7, a coil 9 and a closing portion 10 An annular side plate 11 is provided between the plungers 5 and guides the magnetic path from the case 7 to the plunger 5, and the closing portion 10 is fixed by caulking at the open end of the case 7. The closing portion 10 and the bobbin 8 are integrally formed of, for example, a resin. In this molding, the side plate 11 and the first and second terminals 12 and 13 for supplying electricity to the coil 9 are inserted. Has been molded. The hollow interior of the bobbin 8 is a hollow portion 81 into which the plunger 5 is reciprocally inserted. A substantially central portion in the radial direction of the closing portion 10 has a second valve seat 14 slightly projecting toward the hollow portion 81 on the center axis, and the second valve seat 14 is provided on the center axis along the center axis. A second flow path 15 that opens is provided. In the annular side plate 11, a part of the inner peripheral surface in the circumferential direction is exposed to the hollow portion 81, and a part of the outer peripheral surface in the circumferential direction contacts the inner peripheral surface of the case 7. ing. An annular center plate 6 is provided between the lower end surface of the bobbin 8 and the inner end surface of the flange portion 71 of the case 7.
Has been assembled. The inner diameter of the center plate 6 is slightly smaller than the diameter of the hollow portion 81 of the bobbin 8. The inner diameter of the flange portion 71 of the case 7 is slightly larger than the inner diameter of the center plate 6. Then, a portion having a slightly larger diameter than the other portion of the valve body 3 is positioned in the hollow portion 81 through the hole of the center plate 6 at the step surface between the hollow portion 81 and the center plate 6. It is inserted and fixed in a liquid-tight manner. The valve body 3 is a valve sleeve 16 made of a metal having a cylindrical outer periphery, and has a resin portion 17 on its inner periphery over substantially the entire length. The valve sleeve 16 has first and second radially penetratingly formed lower portions in the figure at predetermined axial intervals.
Outflow / inflow ports 18 and 19 are provided. Note that the first outflow / inflow port 18 is on the lower side. On the other hand, the resin portion 17 includes a first valve seat 20 to which the plunger 5 comes into contact with and separates, a first flow passage 21 opening on the first valve seat 20 formed on the central axis of the valve body 3, and a plunger. Holding portion 23 holding a coil spring 22 as an urging means for urging the coil 5 in a direction away from the first valve seat 20
And The outer diameter of the first valve seat 20 is stepped, and the plunger 5 side is smaller than the inner diameter of the valve sleeve 16, and slightly protrudes from the upper end surface of the valve sleeve 16 toward the plunger 5. The small diameter portion 20A of the first valve seat 20 extends from the axial second inflow / outflow port 19 to the lower side in the figure. An annular gap 24 is formed between the small diameter portion 20A and the valve sleeve 16 and extends all the way to the lower side of the second inflow / outflow port 19 in the axial direction. This annular gap 24
The coil spring 22 is inserted into the first valve seat 20, and the step surface of the small diameter portion 20 </ b> A of the first valve seat 20 is
3 will be achieved. The other end of the coil spring 22 is in contact with the end face of the plunger 5. Since the annular gap 24 extends to the lower side of the second inflow / outflow port 19,
The first flow path 21 communicates with the inside of the hollow portion 81 of the bobbin 8 via the annular gap 24. The large diameter portion 20B of the first valve seat 20 is inserted and fixed to the inner peripheral surface of the valve sleeve 16 in a liquid-tight manner, and its lower end surface is substantially flush with the lower end surface of the valve sleeve 16. 16 openings are closed. The large diameter portion 20B has a passage 25 formed radially therethrough at the position of the first inflow / outflow port 18 provided in the valve sleeve 16, and this passage 25 It communicates with a first flow path 21 opening to the first valve seat 20. Therefore, the first inflow / outflow port 18 and the second inflow / outflow port 19 are connected to the passage 25, the first passage 21, the inside of the hollow portion 81 of the bobbin 8, and the annular gap 24.
Is communicated through. In this embodiment, of the first and second outflow / inflow ports 18 and 19, the length of the first inflow / outflow port 18 in the circumferential direction is set.
The length is greater than the circumferential length of the passage 25. The valve body 3 is connected to the valve sleeve 1.
6 is molded with resin by inserting. At this time, as described above, the length of the first inflow / outflow port 18 in the circumferential direction is passed.
Since the length of the passage 25 in the circumferential direction is larger than that of the passage 25 , the flowable resin flows around both sides in the circumferential direction of the passage , which is an extra space between the passage and the first inflow / outflow port 18 (FIG. 1B).
Middle shaded portion; see arrow C). This prevents the valve sleeve 16 from coming off and rotating during molding. In this embodiment, the first inflow / outflow port 1
Although the length of 8 is increased in the circumferential direction, it may be increased in the axial direction, and may be increased in both directions in order to further prevent detachment and rotation. Further, in this embodiment, only the first inflow / outflow port 18 has a larger circumferential length or an axial length, but the second inflow / outflow port 19 may be larger. Both outflow / inflow ports may be enlarged in order to prevent slippage and rotation. On the other hand, the plunger 5 includes the first and second valve seats 2.
0 and 14 are slidably inserted into the hollow portion 81 of the bobbin 8 via the sleeve 26 provided between the end surface of the valve sleeve 16 and the end surface of the side plate 11 exposed to the hollow portion 81. Have been. The outer periphery of the plunger 5 has slits 51 that allow fluid to flow on both end faces of the plunger 5. Here, the operation of the solenoid valve 1 having the above configuration will be described. When the solenoid 2 is not energized to the coil 9, the plunger 5 is separated from the first valve seat 20 by the spring force of the coil spring 22 and is pressed toward the second valve seat 14. Therefore, the end face of the plunger 5 is in contact with the second valve seat 14 to close the second flow path 13 and the first valve seat 2
The first flow path 21 opening to zero opens. Thereby, the first inflow / outflow port 18 and the second inflow / outflow port 19 are connected to the passage 2.
5, communicating with the first flow path 21, the inside of the hollow portion 81, and the annular gap 24 so that the fluid flows between the first inflow / outflow port 18 and the second outflow / inflow port 19 through the first flow path 21. Become. When the coil 9 of the solenoid 2 is energized via the first and second terminals 12 and 13, the coil 9 is energized, and the valve sleeve 16 -center plate 6 -case 7 -side plate 11 -plunger 5 is energized. A magnetic circuit consisting of the valve sleeve 16 is formed. Thereby, the plunger 5 is magnetically attracted to the valve sleeve 16 side against the spring force of the coil spring 22. Therefore, the plunger 5 is separated from the second valve seat 14 and comes into contact with the opposing first valve seat 20.
While closing the first flow path 21 opening to the first valve seat 20,
The second flow path 15 opening to the second valve seat 14 opens. Also the first
Since the valve seat 20 is located slightly higher, the annular gap 24 is open. From these, the second outflow / inflow port 1
9 and the second flow path 21 communicate with each other through the annular gap 24 and the slit 51 of the plunger 5, so that the fluid flows between the second inflow / outflow port 19 and the second flow path 21. In the solenoid valve as the control valve having the above-described structure, since the outer peripheral portion of the valve body 3 is a metal valve sleeve 16 having first and second inflow / outflow ports 18 and 19, the valve body 3 is provided. The outer circumference of 3 is straight. Therefore, the mounting hole 27A of the mating mounting member 27 to which the valve body 3 of the solenoid valve 1 is mounted can be made straight as shown in FIG. 1C, and the processing of the mating mounting member 27 can be facilitated. Since the valve sleeve 16 is made of metal, the outer diameter tolerance can be strictly secured, the clearance seal with the mounting hole 27A can be securely performed, and the seal between the first and second outflow / inflow ports 18 and 19 can be secured. Can be performed reliably. Then, the circumferential length or axial length of the first inflow / outflow port 18 of the valve sleeve 16 is changed to the passage.
Is larger than the length in the circumferential direction or the length in the axial direction of the valve body 3.
It will go around the extra space of the inflow / outflow port 18.
Therefore, during molding, the valve sleeve 16 may come off,
There is no turning around. As described above, when the valve sleeve 16 comes off,
The circumferential length of the first inflow / outflow port 18 to prevent rotation
Alternatively, since it is only necessary to increase the axial length, the processing of the valve sleeve 16 can be facilitated. In addition, the processing is the first of the valve sleeve 16.
The circumferential length or axial length of the inflow / outflow port 18
Is larger than the circumferential length or the axial length of the passage, so that the first valve seat 20 and the first valve seat 20 formed of resin, which are other components of the valve body 3. The opening 21 is not affected at all by the holding portion 23 of the coil spring 22 that urges the plunger 5. In the above-described embodiment, an example in which the solenoid 2 is used as the driving means of the valve element has been described. However, the means for driving the valve element is not limited to the solenoid. The same applies to those utilizing pressure. The present invention has the above-described structure and operation. Since the outer peripheral portion of the valve body is a metal valve sleeve having first and second inflow / outflow ports, the valve body has The outer circumference is straight. Therefore, the mounting hole of the mating mounting member can be straightened, and the processing of the mating mounting member becomes easy. Further, since the valve sleeve is made of metal, the outer diameter tolerance can be strictly secured, the clearance seal with the mounting hole can be reliably performed, and the seal between the first and second inflow / outflow ports can be reliably performed. The circumferential direction of at least one of the first and second inflow / outflow ports of the valve sleeve
Length or axial length is equal to the circumferential length of the passage
In other words, since the length is greater than the length in the axial direction, when the valve body is molded from resin by inserting the valve sleeve, the flowable resin flows into an extra space of the inflow / outflow port. Accordingly, the valve sleeve does not come off or rotate during molding. As described above, in order to prevent the valve sleeve from coming off and turning around , the length of the inflow / outflow port in the circumferential direction or the axial direction
Since it is only necessary to increase the length in the direction, the processing of the valve sleeve can be facilitated. In addition, the processing is performed by changing the circumferential length or the axial length of the inflow / outflow port of the valve sleeve in the circumferential direction of the passage.
Since it is only larger than the length in the axial direction or the length in the axial direction, a valve seat formed of resin, which is another component of the valve body, a flow path opened to the valve seat, and an urging force for urging the valve element There is no effect on the holding part of the means. From the above, while securing the valve seat, the flow path opened to the valve seat, and the holding portion of the urging means for urging the valve element,
By inserting the valve sleeve, it is possible to facilitate the processing of the valve sleeve which can prevent the valve body from slipping out and turning during molding of the valve body with resin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is an overall sectional view of a solenoid valve as a control valve according to an embodiment of the present invention, and FIG. (C) is a cross-sectional view of a main part of a mating mounting member to which the solenoid valve of FIG. (A) is mounted. FIG. 2A is an overall cross-sectional view of a solenoid valve as a conventional control valve, and FIG. 2B is a cross-sectional view of a main part of a mating mounting member to which the solenoid valve of FIG. It is. 3 (a) is an overall sectional view of a solenoid valve as another conventional control valve, and FIG. 3 (b) is a view taken in the direction of arrow A in FIG. 3 (a), and FIG. () Is a sectional view of a main part of a mating mounting member to which the solenoid valve of FIG. [Description of Signs] 1 solenoid valve (control valve) 2 solenoid (driving means) 3 valve body 4 solenoid body 5 plunger (valve element) 51 slit 6 center plate 7 case 71 flange portion 8 bobbin 81 hollow portion 9 coil 10 closing portion 11 side plate 12 1st terminal 13 2nd terminal 14 2nd valve seat 15 2nd flow path 16 valve sleeve 17 resin section 18 1st inflow / outflow port 19 2nd inflow / outflow port 20 1st valve seat 20A small diameter section 20B large diameter Part 21 first flow path 22 coil spring (biasing means) 23 holding part 24 annular gap 25 passage 26 sleeve 27 mating mounting member 27A mounting hole

Claims (1)

(57) [Claim 1] A valve body, a valve seat to which the valve body comes in contact with and separate from the valve body, a flow passage opening to the valve seat, and a passage extending radially from the flow passage.
A resin portion to obtain, said passage and first provided by an axial spacing which communicates the external, cylindrical with a second inflow and outflow ports
A valve body having a metal valve sleeve, and a biasing means holding portion for biasing means for biasing the valve body in a direction away from the valve seat; and holding the biasing means holding portion of the valve body. Biasing means for biasing the valve body in a direction away from the valve seat, and driving means for driving the valve body to contact the valve seat against the biasing force of the biasing means. The valve body is mounted in a mounting hole of a mating mounting member to seal a gap between the first and second inflow / outflow ports, and the valve body is brought into contact with and separated from the valve seat by the driving means and the urging means. A control valve that opens and closes a flow path that opens to a valve seat that communicates between the first and second inflow / outflow ports.
In the access port, the resin part is a part of the resin part.
So that the outside diameter is larger than the inside diameter of the valve sleeve
A control valve, which wraps around the one inflow / outflow port .