CN104653810B - Composite ceramics spheroid and preparation method thereof - Google Patents
Composite ceramics spheroid and preparation method thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 130
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 73
- 239000010959 steel Substances 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 14
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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Abstract
本发明涉及一种用于高压陶瓷球阀的复合陶瓷球体及其制作方法，复合陶瓷球体包括钢制圆筒、钢制圆筒内设置的陶瓷内套、设置在钢制圆筒上端的上阀杆座、设置在钢制圆筒下端的下阀杆座，通过热套工艺或者粘合剂在钢制圆筒内设置陶瓷内套，陶瓷内套一端设置有球面头，陶瓷内套另一端设置有陶瓷外套，陶瓷外套设置在钢制圆筒外侧，上、下阀杆座与陶瓷外套紧密配合，上阀杆座底面和下阀杆座底面均设置有凸起，钢制圆筒外表面设置有与凸起相啮合的凹槽，陶瓷外套上设置有锥形孔，上、下阀杆座与陶瓷外套接触面设置为锥形面，本发明解决了复合陶瓷球体上的陶瓷材料不容易安装，陶瓷材料和钢制球体结合不紧密，阀杆座向陶瓷球体传递扭矩不可靠的问题。
The invention relates to a composite ceramic sphere used for a high-pressure ceramic ball valve and a manufacturing method thereof. The composite ceramic sphere includes a steel cylinder, a ceramic inner sleeve arranged inside the steel cylinder, and an upper valve stem arranged at the upper end of the steel cylinder. Seat, the lower valve stem seat set at the lower end of the steel cylinder, a ceramic inner sleeve is set in the steel cylinder through a shrink-fit process or an adhesive, one end of the ceramic inner sleeve is provided with a spherical head, and the other end of the ceramic inner sleeve is provided with a Ceramic casing, the ceramic casing is set on the outside of the steel cylinder, the upper and lower valve stem seats are closely matched with the ceramic casing, the bottom surface of the upper valve stem seat and the bottom surface of the lower valve stem seat are provided with protrusions, and the outer surface of the steel cylinder is provided with The groove engaged with the protrusion is provided with a tapered hole on the ceramic casing, and the contact surfaces of the upper and lower valve stem seats and the ceramic casing are set as conical surfaces. The invention solves the problem that the ceramic material on the composite ceramic sphere is not easy to install, The combination of ceramic material and steel ball is not tight, and the torque transmission from the stem seat to the ceramic ball is unreliable.
Description
技术领域technical field
本发明属于陶瓷球阀技术领域，尤其涉及一种用于高压陶瓷球阀的复合陶瓷球体及其制作方法。The invention belongs to the technical field of ceramic ball valves, and in particular relates to a composite ceramic ball used for high-pressure ceramic ball valves and a manufacturing method thereof.
背景技术Background technique
陶瓷球阀由于陶瓷材料变形量很小，结合强度较高，因此具有良好的抗拉性、抗压性、耐磨性和耐腐蚀性，随着近些年陶瓷材料的发展和进步，基本解决了陶瓷材料较脆的不足，使陶瓷材料的韧性和强度得到了较大的提高，逐步代替了金属球阀，解决了金属球阀易泄漏、扭矩大、密封面不耐腐蚀、可靠性低、使用寿命短的缺点，再加上制造陶瓷的原料广泛，成本低廉，大大节约了金属材料和稀有的矿产资源，因此陶瓷球阀被广泛地应用于电力、石油、化工、冶金、采矿、污水处理等工业领域，尤其是面对高磨损、强腐蚀、高温、高压等恶劣工作环境，陶瓷球阀更显示出其卓越的性能。陶瓷球体作为陶瓷球阀的重要组成部分，直接影响着陶瓷球阀的质量和使用，现在市场上的陶瓷球阀主要分为纯陶瓷球体陶瓷球阀和钢制球体毛胚陶瓷球阀，纯陶瓷球体陶瓷球阀具有整体性好，易安装的优点，但是不能承受较大的启闭扭矩和压力强度；用钢制球体毛胚做成的陶瓷球体，具有更高的强度和可靠性，这种陶瓷球体是在钢制球体毛胚内安装陶瓷内套，在钢制球体毛胚外安装陶瓷镶片，使所有与介质接触的部分均为陶瓷材料，然而这种陶瓷球体由于在安装陶瓷材料时会产生较多的缝隙，不仅使陶瓷球体加工变得复杂，而且无法保证陶瓷材料和钢制球体毛胚紧密的结合，此外，虽然陶瓷材料的自润滑性可以减小阀门的开闭扭矩，但是仍然无法满足阀杆座向陶瓷球体传递扭矩的要求。Due to the small deformation of ceramic materials and high bonding strength, ceramic ball valves have good tensile, compressive, wear-resistant and corrosion-resistant properties. With the development and progress of ceramic materials in recent years, basic problems have been solved. The lack of brittleness of ceramic materials greatly improves the toughness and strength of ceramic materials, and gradually replaces metal ball valves, solving the problems of easy leakage, large torque, non-corrosion-resistant sealing surface, low reliability and short service life of metal ball valves. The disadvantages, coupled with the wide range of raw materials for manufacturing ceramics, low cost, greatly saving metal materials and rare mineral resources, so ceramic ball valves are widely used in electric power, petroleum, chemical industry, metallurgy, mining, sewage treatment and other industrial fields, Especially in the face of harsh working environments such as high wear, strong corrosion, high temperature, and high pressure, ceramic ball valves show their excellent performance. As an important part of ceramic ball valves, ceramic balls directly affect the quality and use of ceramic ball valves. The ceramic ball valves on the market are mainly divided into pure ceramic ball ceramic ball valves and steel ball blank ceramic ball valves. Pure ceramic ball ceramic ball valves have overall It has the advantages of good performance and easy installation, but it cannot withstand large opening and closing torque and pressure strength; ceramic spheres made of steel sphere blanks have higher strength and reliability. This ceramic sphere is made of steel A ceramic inner sleeve is installed inside the sphere blank, and ceramic inserts are installed outside the steel sphere blank, so that all parts in contact with the medium are made of ceramic materials. However, this ceramic sphere will produce more gaps when installing ceramic materials. , not only complicates the processing of the ceramic ball, but also cannot ensure the tight combination of the ceramic material and the steel ball blank. In addition, although the self-lubricating property of the ceramic material can reduce the opening and closing torque of the valve, it still cannot meet the requirements of the valve stem seat. Requirements for torque transmission to ceramic balls.
发明内容Contents of the invention
本发明目的在于克服现有技术中存在的不足而提供一种用于高压陶瓷球阀的复合陶瓷球体及其制作方法，解决了陶瓷球体上的陶瓷材料不容易安装，陶瓷材料和钢制球体结合不紧密，阀杆座向陶瓷球体传递扭矩不可靠的问题。The purpose of the present invention is to overcome the deficiencies in the prior art and provide a composite ceramic sphere for high-pressure ceramic ball valves and its manufacturing method, which solves the problem that the ceramic material on the ceramic sphere is not easy to install, and the combination of the ceramic material and the steel sphere is not easy. Tight, the problem of unreliable torque transmission from the valve stem seat to the ceramic ball.
本发明是这样实现的：一种复合陶瓷球体，包括钢制圆筒、钢制圆筒内设置的陶瓷内套、设置在钢制圆筒上端的上阀杆座、设置在钢制圆筒下端的下阀杆座，其特征在于：陶瓷内套一端设置有球面头，陶瓷内套另一端设置有陶瓷外套，陶瓷外套设置在钢制圆筒外侧，上阀杆座和下阀杆座与陶瓷外套紧密配合，上阀杆座底面和下阀杆座底面均设置有凸起，钢制圆筒外表面设置有与凸起相啮合的凹槽。The present invention is achieved as follows: a composite ceramic sphere, including a steel cylinder, a ceramic inner sleeve set in the steel cylinder, an upper valve stem seat set at the upper end of the steel cylinder, and a The lower valve stem seat is characterized in that: one end of the ceramic inner sleeve is provided with a spherical head, the other end of the ceramic inner sleeve is provided with a ceramic jacket, the ceramic jacket is arranged on the outside of the steel cylinder, the upper valve stem seat and the lower valve stem seat are in contact with the ceramic The jacket is closely matched, the bottom surface of the upper valve stem seat and the bottom surface of the lower valve stem seat are both provided with protrusions, and the outer surface of the steel cylinder is provided with grooves engaged with the protrusions.
所述的上阀杆座和下阀杆座上均设置有螺钉，通过螺钉将上阀杆座和下阀杆座固定安装在钢制圆筒上。Both the upper valve stem seat and the lower valve stem seat are provided with screws, and the upper valve stem seat and the lower valve stem seat are fixedly installed on the steel cylinder through the screws.
所述的陶瓷外套上设置有锥形孔。The ceramic outer casing is provided with a tapered hole.
所述的上阀杆座和下阀杆座与陶瓷外套接触的面设置为锥形面。The surfaces of the upper valve stem seat and the lower valve stem seat in contact with the ceramic jacket are set as tapered surfaces.
所述的凸起为键。The protrusions are keys.
所述的凹槽为键凹槽。The groove is a key groove.
一种复合陶瓷球体的制作方法，其特征在于：A method for making a composite ceramic sphere, characterized in that:
步骤1）、钢制圆筒选用：钢制圆筒根据陶瓷球阀公称压力和公称直径的大小选用不同强度等级的钢种，以满足强度要求；Step 1), selection of steel cylinder: Steel cylinders are selected with different strength grades of steel according to the nominal pressure and nominal diameter of the ceramic ball valve to meet the strength requirements;
步骤2）、陶瓷内套加工：在陶瓷内套的一端设置球面头，另一端连接陶瓷外套；Step 2), ceramic inner sleeve processing: set a spherical head on one end of the ceramic inner sleeve, and connect the other end to the ceramic outer sleeve;
步骤3）、陶瓷外套加工：在陶瓷外套上开设有锥形孔；Step 3), ceramic jacket processing: a tapered hole is opened on the ceramic jacket;
步骤4）、陶瓷内套装配：用热套工艺或者粘合剂从钢制圆筒一端安装设置有球面头一端的陶瓷内套；Step 4), assembly of the ceramic inner sleeve: install the ceramic inner sleeve with the end of the spherical head from one end of the steel cylinder with a shrink-fit process or an adhesive;
步骤 5）、陶瓷外套装配：用热套工艺或者粘合剂从钢制圆筒的另一端安装设置有锥型孔的陶瓷外套；Step 5), assembly of the ceramic jacket: install the ceramic jacket with tapered holes from the other end of the steel cylinder with shrink-fitting process or adhesive;
步骤 6）、上阀杆座、下阀杆座装配：钢制上阀杆座和下阀杆座上均设置有螺钉，通过螺钉与钢制圆筒固定连接，同时，将钢制上阀杆座和下阀杆座的锥形面与陶瓷外套上的锥形孔紧密配合；Step 6), assembly of upper valve stem seat and lower valve stem seat: there are screws on both the steel upper valve stem seat and the lower valve stem seat, which are fixedly connected with the steel cylinder through the screws, and at the same time, the steel upper valve stem The tapered surfaces of the seat and the lower stem seat fit closely with the tapered hole on the ceramic casing;
步骤 7）、键装配：将钢制上阀杆座和钢制下阀杆座底面凸起的键与钢制圆筒外表面的键凹槽相互啮合。Step 7), key assembly: the keys protruding from the bottom surface of the steel upper valve stem seat and the steel lower valve stem seat are engaged with the key grooves on the outer surface of the steel cylinder.
本发明具有如下积极效果：The present invention has following positive effect:
1、由于复合陶瓷球体采用钢制圆筒作为钢制球体毛胚，因此可以选用高强度钢来满足制造高压、大口径球阀的强度要求，同时陶瓷内套和陶瓷外套连接在一起，使陶瓷球体整体性更强，易于陶瓷球阀的安装，改善了现有陶瓷球体存在的不足；1. Since the composite ceramic sphere uses a steel cylinder as the steel sphere blank, high-strength steel can be selected to meet the strength requirements for manufacturing high-pressure and large-diameter ball valves. At the same time, the ceramic inner sleeve and ceramic outer sleeve are connected together to make the ceramic sphere The integrity is stronger, and it is easy to install the ceramic ball valve, which improves the shortcomings of the existing ceramic ball;
2、陶瓷内套和陶瓷外套不仅可以采用热套工艺装配，而且可以用粘合剂胶粘装配，使陶瓷内套、陶瓷外套与钢制球体结合更加紧密，装配更加可靠；2. The ceramic inner sleeve and ceramic outer sleeve can not only be assembled by shrink-fitting process, but also can be assembled with adhesive, so that the ceramic inner sleeve, ceramic outer sleeve and steel sphere can be combined more closely, and the assembly is more reliable;
3、由于陶瓷外套为一个整体，使陶瓷球体表面只有一道接缝，比之前的陶瓷球体多缝隙设计更加简单，强度更高，加工也更加方便；3. Since the ceramic jacket is a whole, there is only one seam on the surface of the ceramic sphere, which is simpler, stronger and more convenient to process than the previous multi-slit design of the ceramic sphere;
4、将上阀杆座和下阀杆座与陶瓷外套紧密配合的面设置为锥形面，上、下阀杆座锥形面与陶瓷外套上的锥形孔紧密配合，使得陶瓷外套与钢制圆筒的结合更加紧密和牢固；4. Set the surfaces where the upper valve stem seat and the lower valve stem seat are closely matched with the ceramic jacket as tapered surfaces. The combination of the cylinder is more compact and firm;
5、上、下阀杆座的键和钢制球体的键槽相互啮合，从而更有利于阀杆座向陶瓷球体传递扭矩。5. The keys of the upper and lower valve stem seats and the key grooves of the steel ball are engaged with each other, which is more conducive to the torque transmission from the valve stem seat to the ceramic ball.
附图说明Description of drawings
图1为复合陶瓷球体的纵切剖面结构示意图。Fig. 1 is a schematic diagram of a longitudinal section structure of a composite ceramic sphere.
图2为复合陶瓷球体沿A-A纵切剖面结构示意图。Fig. 2 is a schematic diagram of the composite ceramic sphere's longitudinal section along A-A.
具体实施方式detailed description
实施例：如图1和图2所示，一种复合陶瓷球体，包括钢制圆筒1、钢制圆筒1内设置的陶瓷内套2、设置在钢制圆筒1上端的上阀杆座3、设置在钢制圆筒1下端的下阀杆座4，陶瓷内套2一端设置有球面头5，陶瓷内套2另一端设置有陶瓷外套6，陶瓷外套6设置在钢制圆筒1外侧，上阀杆座3和下阀杆座4与陶瓷外套6紧密配合，上阀杆座3底面和下阀杆座4底面均设置有凸起7，钢制圆筒1外表面设置有与凸起7相啮合的凹槽8，所述的上阀杆座3和下阀杆座4上均设置有螺钉9，通过螺钉9将上阀杆座3和下阀杆座4固定安装在钢制圆筒1上，陶瓷外套6上设置有锥形孔，将上阀杆座3和下阀杆座4与陶瓷外套6接触的面设置为锥形面10，所述的凸起7为键，凹槽8为键凹槽。Embodiment: As shown in Figure 1 and Figure 2, a composite ceramic sphere includes a steel cylinder 1, a ceramic inner sleeve 2 arranged in the steel cylinder 1, and an upper valve stem arranged at the upper end of the steel cylinder 1 Seat 3, the lower valve stem seat 4 arranged at the lower end of the steel cylinder 1, one end of the ceramic inner sleeve 2 is provided with a spherical head 5, the other end of the ceramic inner sleeve 2 is provided with a ceramic jacket 6, and the ceramic jacket 6 is arranged on the steel cylinder 1 outside, the upper valve stem seat 3 and the lower valve stem seat 4 are closely matched with the ceramic jacket 6, the bottom surface of the upper valve stem seat 3 and the bottom surface of the lower valve stem seat 4 are provided with protrusions 7, and the outer surface of the steel cylinder 1 is provided with The groove 8 engaged with the protrusion 7, the upper valve stem seat 3 and the lower valve stem seat 4 are provided with screws 9, and the upper valve stem seat 3 and the lower valve stem seat 4 are fixedly installed on the On the steel cylinder 1, the ceramic outer casing 6 is provided with a tapered hole, and the surfaces where the upper valve stem seat 3 and the lower valve stem seat 4 are in contact with the ceramic outer casing 6 are set as a tapered surface 10, and the protrusion 7 is Key, groove 8 is a key groove.
一种复合陶瓷球体的制作方法，有以下步骤：A method for making a composite ceramic sphere comprises the following steps:
步骤1）、钢制圆筒1选用：钢制圆筒1根据陶瓷球阀公称压力和公称直径的大小选用不同强度等级的钢种，以满足强度要求；Step 1), selection of steel cylinder 1: Steel cylinder 1 selects steel grades of different strength grades according to the nominal pressure and nominal diameter of the ceramic ball valve to meet the strength requirements;
步骤2）、陶瓷内套2加工：在陶瓷内套2的一端设置球面头5，另一端连接陶瓷外套6；Step 2), processing of the ceramic inner sleeve 2: setting a spherical head 5 at one end of the ceramic inner sleeve 2, and connecting the ceramic outer sleeve 6 at the other end;
步骤3）、陶瓷外套6加工：在陶瓷外套6上开设有锥形孔；Step 3), processing of the ceramic jacket 6: a tapered hole is opened on the ceramic jacket 6;
步骤4）、陶瓷内套2装配：用热套工艺或者粘合剂从钢制圆筒1一端安装设置有球面头5一端的陶瓷内套2；Step 4), assembly of the ceramic inner sleeve 2: install the ceramic inner sleeve 2 provided with the end of the spherical head 5 from one end of the steel cylinder 1 with a shrink-fit process or an adhesive;
步骤 5）、陶瓷外套6装配：用热套工艺或者粘合剂从钢制圆筒1的另一端安装设置有锥型孔的陶瓷外套6；Step 5), assembly of the ceramic jacket 6: install the ceramic jacket 6 with a tapered hole from the other end of the steel cylinder 1 using a shrink-fit process or an adhesive;
步骤 6）、上阀杆座3、下阀杆座4装配：钢制上阀杆座3和下阀杆座4上均设置有螺钉9，通过螺钉9与钢制圆筒1固定连接，同时，将钢制上阀杆座3和下阀杆座4的锥形面10与陶瓷外套6上的锥形孔紧密配合；Step 6), assembly of upper valve stem seat 3 and lower valve stem seat 4: the steel upper valve stem seat 3 and the lower valve stem seat 4 are provided with screws 9, which are fixedly connected to the steel cylinder 1 through the screws 9, and at the same time , the tapered surface 10 of the steel upper valve stem seat 3 and the lower valve stem seat 4 is closely matched with the tapered hole on the ceramic jacket 6;
步骤 7）、键装配：将钢制上阀杆座3和钢制下阀杆座4底面凸起7的键与钢制圆筒1外表面的键凹槽8相互啮合。Step 7), key assembly: the key with the protrusion 7 on the bottom surface of the steel upper valve stem seat 3 and the steel lower valve stem seat 4 is engaged with the key groove 8 on the outer surface of the steel cylinder 1 .
本发明解决了复合陶瓷球体上的陶瓷材料不容易安装，陶瓷材料和钢制球体结合不紧密，阀杆座向陶瓷球体传递扭矩不可靠的问题。The invention solves the problems that the ceramic material on the composite ceramic sphere is not easy to install, the combination of the ceramic material and the steel sphere is not tight, and the torque transmission from the valve rod seat to the ceramic sphere is unreliable.
Claims (7)
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| CN104896134A (en) * | 2015-06-05 | 2015-09-09 | 王照业 | Floating spherical crown type sphere |
| CN107237899A (en) * | 2017-07-01 | 2017-10-10 | 宁波华成阀门有限公司 | A kind of high-wear-resistance long-service-life ball valve and its manufacture method |
| CN107314124B (en) * | 2017-08-31 | 2018-10-12 | 郑州鼎盛新技术有限公司 | A kind of processing method of the compound ball valve core of ceramet |
| CN113062998B (en) * | 2021-03-29 | 2023-03-03 | 浙江球特阀门有限公司 | Wear-resistant ball and production process thereof |
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| CN101660618A (en) * | 2009-09-25 | 2010-03-03 | 四川苏克流体控制设备有限公司 | Hard sealing ball valve and production process thereof |
| CN102635700A (en) * | 2012-04-28 | 2012-08-15 | 郑州鼎盛工程技术有限公司 | Ball body of rupture-preventing heavy-caliber composite ceramic ball valve, composite ceramic ball valve and manufacture methods thereof |
| CN103291951A (en) * | 2013-06-19 | 2013-09-11 | 杨涛 | Scouring-resistant wear-resistant corrosion-resistant mid-high pressure ceramic ball valve and manufacturing method thereof |
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| WO1999040348A1 (en) * | 1998-02-06 | 1999-08-12 | Hydraulic Engineering S.A. | Shutter for ball valves |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660618A (en) * | 2009-09-25 | 2010-03-03 | 四川苏克流体控制设备有限公司 | Hard sealing ball valve and production process thereof |
| CN102635700A (en) * | 2012-04-28 | 2012-08-15 | 郑州鼎盛工程技术有限公司 | Ball body of rupture-preventing heavy-caliber composite ceramic ball valve, composite ceramic ball valve and manufacture methods thereof |
| CN103291951A (en) * | 2013-06-19 | 2013-09-11 | 杨涛 | Scouring-resistant wear-resistant corrosion-resistant mid-high pressure ceramic ball valve and manufacturing method thereof |
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Effective date of registration: 20201112 Address after: 224000 604, building 31, Hongya Mingju, Hede Town, Sheyang County, Yancheng City, Jiangsu Province Patentee after: Liu Jingjing Address before: 450007 the Great Wall garden, No. 3, friendship road, Zhongyuan District, Henan, Zhengzhou 805 Patentee before: Yang Tao |
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Application publication date: 20150527 Assignee: Yancheng Yidao Translation Technology Co.,Ltd. Assignor: Liu Jingjing Contract record no.: X2023980045845 Denomination of invention: Composite ceramic sphere and its production method Granted publication date: 20170926 License type: Common License Record date: 20231110 |
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Effective date of registration: 20240320 Address after: 325000 He Yi Village, Oubei Street, Yongjia County, Wenzhou City, Zhejiang Province (within Yongjia Yihao Metal Products Co., Ltd.) Patentee after: Maoye Valve Co.,Ltd. Country or region after: China Address before: 224000 604, building 31, Hongya Mingju, Hede Town, Sheyang County, Yancheng City, Jiangsu Province Patentee before: Liu Jingjing Country or region before: China |
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Denomination of invention: Composite ceramic sphere and its manufacturing method Granted publication date: 20170926 Pledgee: Zhejiang Yongjia Rural Commercial Bank Co.,Ltd. Qingshuibu Branch Pledgor: Maoye Valve Co.,Ltd. Registration number: Y2024330002570 |
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