Plastic ball valve

Abstract

The invention discloses a plastic ball valve, and relates to the technical field of valve structures. According to the integrally-formed plastic ball valve, the valve element serves as the insert and is subjected to injection molding with the valve body to form the integrally-formed plastic ball valve, due to the fact that the sealing structure does not participate in the integrally-formed process, the abutting force on the valve body in the insert injection molding process is small, deformation of the valve element cannot be caused, and the torque needed when the plastic ball valve is opened and closed can be reduced. In addition, through the design of a first sealing assembly, a first sealing ring and a second sealing ring are limited at the connecting position of the valve body and the valve element through a connecting pressing piece, an inclined face is formed on one side of the second sealing ring, and when water flow passes through, the first sealing ring can be continuously pushed to the direction of the second sealing ring when the water flow flows in the direction close to the valve element; and the sealing effect of the plastic ball valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve structures, and more particularly, to a plastic ball valve. Background Art

[0002] A plastic ball valve is a ball valve structure with light weight and strong corrosion resistance, and is applied to multiple fields, such as pipeline systems for general pure water and raw drinking water, drainage and sewage pipeline systems, brine and seawater pipeline systems, acid-base and chemical solution systems, and other industries. The assembly combination of the valve body, valve core, and sealing washer of the plastic ball valve mainly has two manufacturing methods, including the assembled type and the integral injection molding type.

[0003] Among them, in the assembled type, the valve body, valve core, valve stem, and sealing washer are separately manufactured and then assembled. One end of the diameter of such a valve body is connected to a gland with threads, and the locking and positioning are uncertain, and the product assembly is difficult; the socket uses a threaded union connection method to connect pipes, and the threaded union has low pressure-bearing capacity and poor effect, etc.

[0004] In the integral injection molding type, after the valve core and the sealing washer are separately injection molded, when the valve body is injection molded, the valve core and the sealing washer are used as inserts to be integrally injection molded with the valve body. When the integral injection molding valve body is injection molded, a set of large pressures are applied to the sealing washer by the left and right two core rods of the mold, so that the sealing washer is compressed and sealed. When the valve core is squeezed by the sealing washers at both ends in the mold under high temperature and high pressure, the valve core is easily squeezed and deformed, resulting in unsmooth rotation, jamming, and large resistance when the valve core rotates; and a gap is generated between the surface of the deformed valve core and the sealing of the sealing washer, and a good sealing effect cannot be formed.

[0005] Since the plastic ball valves currently supplied on the market all have two major defects that the pressure-bearing capacity of the ball valve is low, resulting in the influence on the sealing performance, and the opening and closing rotation torque of the ball valve is large, therefore, a new type of ball valve is continuously provided to solve the above problems.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a plastic ball valve.

[0008] The present invention is implemented as follows:

[0009] In a first aspect, the present invention provides a plastic ball valve, including a valve body, a valve core, an operating component, and a first sealing component.

[0010] The valve core and the valve body are integrally formed by insert injection molding. The valve core includes a core rod portion and a valve ball portion. The valve ball portion is accommodated in the valve body, and the core rod portion extends out of the valve body; the operating component is fixedly connected to the core rod portion of the valve core to control the rotation of the valve ball portion in the valve body.

[0011] The first sealing assembly includes a connecting and pressing member, a first sealing ring, and a second sealing ring arranged in sequence; the connecting and pressing member is fixedly connected to the wall surface of the through hole of the valve body, and a sealing accommodation groove is formed between the connecting and pressing member, the second sealing ring, and the wall surface of the through hole of the valve body. The groove wall of the sealing accommodation groove close to the valve core side is an inclined surface, and the inclination direction from the groove opening to the groove bottom is the direction close to the valve core. The first sealing ring is accommodated in the sealing accommodation groove, and the side of the second sealing ring away from the first sealing ring contacts and abuts against the surface of the valve ball part.

[0012] In an alternative embodiment, the diameter of the through hole of the valve ball part of the valve core is smaller than the diameter of the through hole of the valve body. When the through hole of the valve core rotates to be coaxial with the through hole of the valve body, the area where the valve ball part protrudes from the valve body is the sealing area, and the side of the second sealing ring away from the first sealing ring contacts and abuts against the sealing area.

[0013] In an alternative embodiment, the second sealing ring includes a straight section part and a convex part. The convex part protrudes from the straight section part along the side close to the valve ball part, and the end face of the convex part away from the straight section part contacts the wall surface of the through hole of the valve body. Both the straight section part and the convex part contact the valve ball part.

[0014] In an alternative embodiment, the connection part between the straight section part and the convex part does not contact the valve ball part.

[0015] In an alternative embodiment, the connecting and pressing member is threadedly connected to the wall surface of the through hole of the valve body.

[0016] In an alternative embodiment, an anti-rotation part is provided on the inner wall surface of the connecting and pressing member. The anti-rotation part includes at least one of an inner corner structure, a convex rib, or a groove.

[0017] In an alternative embodiment, a limiting protrusion is provided at the axis of the end of the valve ball part away from the core rod part, and a limiting groove is provided on the valve body corresponding to the limiting protrusion. The limiting protrusion is accommodated in the limiting groove.

[0018] In an alternative embodiment, the operating assembly includes an operating handle and a handle cover. A through hole is provided in the center of the operating handle, the core rod part is located in the through hole of the operating handle and is limited and fixed to the operating handle, the valve body contacts the operating handle, and the handle cover is installed on the end face of the through hole of the operating handle.

[0019] In an alternative embodiment, a third sealing member is further included, and the third sealing member is provided at the connection of the valve body, the core rod part, and the operating assembly.

[0020] In an alternative embodiment, the valve body includes a first diameter part and a second diameter part. The diameter of the first diameter part is larger than the diameter of the second diameter part, and the first sealing assembly is installed on the second diameter part.

[0021] The present invention has the following beneficial effects:

[0022] The present invention provides a plastic ball valve. By using the valve core as an insert and performing injection molding with the valve body, an integrally formed plastic ball valve is formed. Since the sealing structure does not participate in the integrally formed process, the holding force on the valve body during the insert injection molding process is small, and it will not cause deformation of the valve core, which is beneficial to reducing the torque required for opening and closing the plastic ball valve. In addition, through the design of the first sealing assembly, the connecting pressing member limits the first sealing ring and the second sealing ring at the connection between the valve body and the valve core. By forming an inclined surface on one side of the second sealing ring, when water flows through, when the water flows in the direction close to the valve core, it will continuously push the first sealing ring towards the direction of the second sealing ring, improving the sealing effect of the plastic ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the plastic ball valve provided by the embodiment of the present invention;

[0025] Figure 2 Exploded view of the structure of the plastic ball valve provided by the embodiment of the present invention;

[0026] Figure 3 Cross-sectional view of the plastic ball valve provided by the embodiment of the present invention;

[0027] Figure 4 For Figure 3 Enlarged view of the structure A;

[0028] Figure 5 Structural schematic diagram of the connecting pressing member provided by the embodiment of the present invention;

[0029] Figure 6 Structural schematic diagram of the second sealing ring provided by the embodiment of the present invention.

[0030] Main element symbol description: 100 - plastic ball valve; 110 - valve body; 111 - limiting groove; 112 - first diameter part; 113 - second diameter part; 120 - valve core; 121 - core rod part; 122 - valve ball part; 1221 - sealing area; 1222 - limiting protrusion; 130 - operating assembly; 131 - operating handle; 132 - handle cover; 140 - first sealing assembly; 141 - connecting pressing member; 1411 - anti-rotation part; 142 - first sealing ring; 143 - second sealing ring; 1431 - straight section part; 1432 - protruding part; 1433 - inclined surface; 144 - sealing receiving groove; 150 - third sealing member. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the accompanying drawings in the embodiments of the present invention will be used hereinafter to clearly and completely describe the technical solutions in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0035] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] First Embodiment

[0038] Please refer to Figure 1 and Figure 2 , this embodiment provides a plastic ball valve 100, which includes a valve body 110, a valve core 120, an operating assembly 130 and a first sealing assembly 140.

[0039] The inventors' research found that plastic ball valves 100 generally include two types, one is an assembled type, and the other is an integrally injection-molded type. Among them, the assembled type has problems such as many connection positions, difficult positioning, and low product pressure-bearing capacity. And the existing integrally injection-molded type is to use the valve core 120 and the sealing structure together as inserts for injection molding. Since the valve core 120 and the sealing structure are two independent structures, in order to ensure the fixed position of the two during the injection molding process, a large force needs to be applied to the valve core 120 and the sealing structure, which easily causes the valve core 120 to be deformed by force, such as changing from a spherical shape to an ellipsoidal shape, greatly affecting the yield rate of the plastic ball valve 100. At the same time, it will cause an increase in the rotational resistance of the plastic ball valve 100 during use, affecting the use experience of the plastic ball valve 100.

[0040] Therefore, for the plastic ball valve 100 provided in this embodiment, after the valve core 120 is first manufactured, the valve core 120 is then placed as an insert into the mold and injection-molded with the valve body 110 to obtain an integrally formed structure of the valve core 120 and the valve body 110. Since the valve body 110 and the valve core 120 are integrally formed, the assembly of the valve core 120 is omitted, reducing the assembly difficulty of the plastic ball valve 100. In addition, during the integrally forming process, only the valve core 120 and the valve body 110 are formed together, and the sealing structure is assembled after the valve core 120 and the valve body 110 are formed. Therefore, during the insert injection molding process, there is only one structure of the insert, which is the valve core 120. The core used to control the position of the insert applies a small pressure to the insert, and the valve core 120 will not be deformed, improving the yield rate of the plastic ball valve 100. At the same time, the plastic ball valve 100 rotates more smoothly during use, improving the use experience of the plastic ball valve 100.

[0041] Please refer to Figure 2 and Figure 3 , specifically, the valve core 120 includes a core rod portion 121 and a valve ball portion 122. The valve ball portion 122 is accommodated in the valve body 110, and the core rod portion 121 extends out of the valve body 110; the operating assembly 130 is fixedly connected to the core rod portion 121 of the valve core 120 and is in contact with and limited by the end face of the valve body 110 to control the rotation of the valve ball portion 122 in the valve body 110, thereby controlling the opening and closing of the passage of the plastic ball valve 100.

[0042] In this embodiment, the through-hole of the valve body 110 for water passage includes a first diameter portion 112 and a second diameter portion 113. The diameter of the first diameter portion 112 is greater than that of the second diameter portion 113, and one end of the second diameter portion 113 away from the first diameter portion 112 contacts the valve ball portion 122 of the valve element 120.

[0043] In this embodiment, the first sealing assembly 140 is arranged on the second diameter portion 113 of the valve body 110. This not only facilitates the installation and positioning of the first sealing assembly 140, but also the diameter of the second diameter is smaller than that of the first diameter portion 112. At the same time, the first sealing assembly 140 is arranged on the second diameter portion 113, so the inner diameter of the second diameter portion 113 is further reduced. When water flows into the plastic ball valve 100, the water flow pressure will push the first sealing assembly 140 in the direction close to the valve element 120, thereby ensuring the sealing performance between the valve element 120 and the valve body 110.

[0044] The first sealing assembly 140 is located in the through-hole of the valve body 110 and contacts the valve element 120. Therefore, it can be understood that there are two sets of the first sealing assemblies 140, which are respectively arranged on opposite sides of the valve element 120 to seal the area where the valve element 120 contacts the valve body 110.

[0045] Please refer to Figure 4 , the first sealing assembly 140 includes a connecting and pressing member 141, a first sealing ring 142 and a second sealing ring 143 arranged in sequence.

[0046] Please refer to Figure 5 in conjunction, in this embodiment, the connecting and pressing member 141 is threadedly connected to the second diameter portion 113 of the valve body 110. The connecting and pressing member 141 has an external thread, and the second diameter portion 113 has an internal thread, and the two are threadedly engaged to prevent the connecting and pressing member 141 from shifting.

[0047] Please refer to Figure 4 , a sealing accommodation groove 144 is formed between the connecting and pressing member 141, the second sealing ring 143 and the wall surface of the through-hole of the valve body 110. The groove wall of the sealing accommodation groove 144 on the side close to the valve element 120 is an inclined surface 1433, and the inclined direction from the groove opening to the groove bottom is the direction close to the valve element 120. The first sealing ring 142 is accommodated in the sealing accommodation groove 144, and the side of the second sealing ring 143 away from the first sealing ring 142 contacts and abuts against the surface of the valve ball portion 122.

[0048] The inclined surface 1433 on the groove wall of the sealing accommodation groove 144 is located on one side of the second sealing ring 143, that is, the part where the second sealing ring 143 contacts the first sealing ring 142 is the inclined surface 1433. By setting the inclined surface 1433 and controlling its inclination direction, the cross-section of the sealing accommodation groove 144 presents a trapezoidal structure, which not only realizes the limit of the first sealing ring 142 in the sealing accommodation groove 144, but also when water flows into the through hole of the valve body 110, the pressure of the water flow makes the first sealing ring 142 continuously move and press towards the direction close to the valve core 120, thereby making the contact between the second sealing ring 143 and the valve core 120 closer and strengthening the sealing effect.

[0049] In this embodiment, in order to ensure the installation of the first sealing assembly 140, the through hole diameter of the valve ball part 122 of the valve core 120 is smaller than the through hole diameter of the second diameter part 113 of the valve body 110, and when the first sealing assembly 140 is installed on the second diameter part 113, the inner diameter of the second sealing ring 143 is equal to the through hole diameter of the valve ball part 122 to ensure the stable installation of the second sealing ring.

[0050] In this embodiment, when the through hole of the valve core 120 rotates to be coaxial with the through hole of the valve body 110, the arc area where the valve ball part 122 protrudes from the valve body 110 is the sealing area 1221, and the side of the second sealing ring 143 away from the first sealing ring 142 contacts and abuts against the sealing area 1221 to achieve the sealing effect.

[0051] Please refer to Figure 6 , in this embodiment, the second sealing ring 143 includes a straight section part 1431 and a convex part 1432. The convex part 1432 protrudes from the straight section part 1431 along the side close to the valve ball part 122. The end face of the convex part 1432 away from the straight section part 1431 contacts the second diameter part 113 of the valve body 110. Both the straight section part 1431 and the convex part 1432 contact the valve ball part 122, and the connection part between the straight section part 1431 and the convex part 1432 does not contact the valve ball part 122.

[0052] It can be understood that the cross-section of the second sealing ring 143 presents a structure similar to an L shape, but at the corner of the L shape, the side away from the valve core 120 is cut to form an inclined surface 1433, so that a trapezoidal sealing accommodation groove 144 is formed between the second sealing ring 143, the connecting pressing part 141 and the second diameter part 113; the side of the corner of the L shape close to the valve core 120 does not contact the valve core 120 to reduce the resistance required for the valve core 120 to rotate in the valve body 110; both ends of the L-shaped structure on the side close to the valve core 120 contact the sealing area 1221 of the valve core 120 to form a stable seal.

[0053] Please refer to Figure 5, in order to reduce the installation difficulty of the connection pressing member 141, an anti-rotation portion 1411 is provided on the inner wall surface of the connection pressing member 141. In this embodiment, the anti-rotation portion 1411 is an inner octagonal structure. In other embodiments, the anti-rotation portion 1411 can also be structures such as an inner hexagonal shape, a convex rib, or a groove.

[0054] Please refer to Figure 3 , in this embodiment, a limiting protrusion 1222 is provided on the axis of the end of the valve ball portion 122 away from the core rod portion 121. A limiting groove 111 is provided on the valve body 110 corresponding to the limiting protrusion 1222. The limiting protrusion 1222 is received in the limiting groove 111 so as to position the valve core 120 when the valve core 120 rotates in the valve body 110.

[0055] In this embodiment, the operation assembly 130 includes an operation handle 131 and a handle cover 132. A through hole is provided in the center of the operation handle 131. The core rod portion 121 is located in the through hole of the operation handle 131 and is limited and fixed to the operation handle 131. The valve body 110 contacts the operation handle 131, and the handle cover 132 is installed on the end face of the through hole of the operation handle 131.

[0056] In an alternative embodiment, a third sealing member 150 is further included. The third sealing member 150 is provided at the connection of the valve body 110, the core rod portion 121, and the operation assembly 130 to prevent water leakage at the connection.

[0057] By providing the operation assembly 130, an operator can drive the valve core 120 to rotate in the valve body 110 by screwing the operation handle 131, thereby completing the process control of the water flow ball valve switch.

[0058] This embodiment provides a plastic ball valve 100, and its assembly process and working principle are as follows:

[0059] First, the valve core 120 is manufactured, and then the valve core 120 is placed as an insert in the mold for manufacturing the valve body 110. The core rod positions the valve core 120 without using a large pressure. The valve ball portion 122 of the valve core 120 is received in the mold of the valve body 110, and the core rod portion 121 extends out of the mold of the valve core 120. Then, insert injection molding is performed on the valve body 110 to obtain a structure in which the valve body 110 and the valve core 120 are integrally formed.

[0060] Install the second sealing ring 143 into the second diameter portion 113 of the valve body 110. Both the straight section portion 1431 and the convex portion 1432 are in contact with the sealing area 1221 on the valve ball portion 122, and the connection between the straight section portion 1431 and the convex portion 1432 is not in contact with the valve ball portion 122 to reduce the resistance of the valve core 120 to rotate within the valve body 110. Then install the first sealing ring 142 into the second diameter portion 113 of the valve body 110 and make it contact with the inclined surface 1433 of the second sealing ring 143. Finally, threadedly fit and install the connection pressing member 141 with the second diameter portion 113, and the connection pressing member 141 is in contact with the first sealing ring 142, thus completing the installation of the first sealing assembly 140 on one side of the valve core 120. The installation process of the first sealing assembly 140 on the other side is the same as above.

[0061] After the installation of the first sealing assembly 140 is completed, install the operating handle 131 on the core rod portion 121 of the valve core 120 and cooperate with the core rod portion 121 for limiting. For example, a first limiting platform can be set in the through hole of the operating handle 131, and a second limiting platform can be set at the corresponding position of the core rod portion 121. The second limiting platform of the core rod portion 121 can be inserted into the through hole from the non-first limiting platform area of the through hole, and then rotate the core rod portion 121 to make the first limiting platform and the second limiting platform limit and cooperate to prevent the operating handle 131 from coming out. Install a third sealing member 150 at the connection of the operating handle 131, the valve body 110 and the core rod portion 121 to prevent water leakage. Finally, cover the handle cover 132 in the through hole of the operating handle 131. The handle cover 132 can be provided with a limiting strip, and the limiting strip is accommodated in the through hole, which can not only improve the connection stability between the handle cover 132 and the operating handle 131, but also the limiting strip can position the first limiting platform and the second limiting platform to prevent the two from rotating and causing the operating handle 131 to disengage from the valve core 120.

[0062] By operating the operating handle 131, the valve core 120 can be driven to rotate within the valve body 110 to realize the opening and closing of the channel. When the channel is opened, water flows through the plastic ball valve 100, applying a force in the direction of the valve core 120 as a whole to the first sealing assembly 140, strengthening the sealing effect. At the same time, since the contact position of the second sealing ring 143 with the valve ball portion 122 is not the entire sealing area 1221, and the valve ball portion 122 will not be deformed by force during the insert molding process, therefore, the opening and closing torque of the plastic ball valve 100 provided in this embodiment is reduced, and the opening and closing rotation process is smoother.

[0063] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plastic ball valve, characterized in that: It includes a valve body, a valve core, an operating assembly and a first sealing assembly; The valve core and the valve body are integrally formed by insert injection molding, the valve core comprises a core rod portion and a valve ball portion, the valve ball portion is accommodated in the valve body, and the core rod portion extends out of the valve body; the operating assembly is fixedly connected to the core rod portion of the valve core to control the valve ball portion to rotate in the valve body; The first sealing assembly includes a connecting clamp, a first sealing ring and a second sealing ring which are arranged in sequence; the connecting clamp is fixedly connected to the wall of the through hole of the valve body, and a sealing receiving groove is formed between the connecting clamp, the second sealing ring and the wall of the through hole of the valve body. The groove wall of the sealing receiving groove close to the valve core is an inclined surface, and the inclination direction from the groove mouth to the groove bottom is the direction close to the valve core. The first sealing ring is accommodated in the sealing receiving groove, and the second sealing ring is in contact with and abuts against the surface of the valve ball part on the side away from the first sealing ring.

2. The plastic ball valve according to claim 1, characterized in that: The through hole diameter of the valve ball portion of the valve core is smaller than the through hole diameter of the valve body. When the valve core rotates until the through hole of the valve core is coaxial with the through hole of the valve body, the area where the valve ball portion protrudes from the valve body is a sealing area, and the side of the second sealing ring away from the first sealing ring contacts and resists the sealing area.

3. The plastic ball valve according to claim 1 or 2, characterized in that: The second sealing ring includes a straight section and a raised section, wherein the raised section protrudes from the straight section along a side close to the valve ball section, and the end surface of the raised section away from the straight section contacts the wall surface of the through hole of the valve body, and both the straight section and the raised section contact the valve ball section.

4. The plastic ball valve according to claim 3, characterized in that: The connection between the straight section and the raised portion does not contact the valve ball portion.

5. The plastic ball valve according to claim 1, characterized in that: The connecting and pressing member is threadedly connected to the wall surface of the through hole of the valve body.

6. The plastic ball valve according to claim 5, characterized in that: The inner wall surface of the connecting and pressing member is provided with a rotation-stopping portion, and the rotation-stopping portion includes at least one of an inner angle structure, a convex ridge or a groove.

7. The plastic ball valve according to claim 1, characterized in that: A limiting protrusion is arranged at the axis of one end of the valve ball portion away from the core rod portion, and a limiting groove is arranged at a position of the valve body corresponding to the limiting protrusion, and the limiting protrusion is accommodated in the limiting groove.

8. The plastic ball valve according to claim 1, characterized in that: The operating assembly includes an operating handle and a handle cover. A through hole is opened at the center of the operating handle. The core rod is located in the through hole of the operating handle and is fixed to the operating handle. The valve body contacts the operating handle, and the handle cover is installed on the end face of the through hole of the operating handle.

9. The plastic ball valve according to claim 1 or 8, characterized in that: It also includes a third sealing component, which is arranged at the connection between the valve body, the core rod part and the operating assembly.

10. The plastic ball valve according to claim 1, characterized in that: The valve body includes a first diameter portion and a second diameter portion, the diameter of the first diameter portion is larger than the diameter of the second diameter portion, and the first sealing assembly is mounted on the second diameter portion.

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