原文：
1、结构特点 1.1、半球体 双偏心半球阀（图1）的半球体采用双偏心设计,密封效果可靠,瞬间脱开,力矩小,使用寿命长。可应用在输送颗粒类介质的苛刻工况中。其结构原理是半球体（图2）中线与阀杆中线偏置尺寸a,与阀座中线偏置尺寸b,全开时球体与阀座xx脱开,并有一定的间隙,回转半径分为长半径和短半径,在长半径转动轨迹的切线会与阀座密封面形成一个θ角,在阀门启闭时,半球相对阀座面有一个渐出脱离（如图在开度10°时,芯已经xx脱离）和渐入挤压的作用,从而降低了启闭时阀座与半球之间的机械磨损和擦伤,提高了使用寿命。 1.护圈2.阀座3.半球体4.阀体 （2）阀座与阀体间的密封采用硬密封结构,适合高温、高压工况。阀座与阀体密封接触面尺寸c值小,各自密封面精度要求高,在装配时,护圈用电动冲击扳手安装,不仅是护圈与阀体啮合,防止松动,而且是阀座摩擦转动,符合机械振动啮合原理,使阀座与阀体可靠密封。 （3）阀座与阀体及阀座与半球体采用两点硬密封, 因此该阀可以应用在高温、高压工况。 1.3、其他零部件 阀门整体采用模块化设计,结构简单,可靠性好,通用性较高。阀杆采用防喷出结构。驱动方式多样化,阀杆、支架与执行机构的连接尺寸符合ISO5211标准,可直接与各种规范执行机构组配。常用的驱动方式有手动、气动、液动、气液联动和电动等,从而提高了双偏心半球阀运用性能。 2、使用范围 双偏心半球阀适合各类通用行业的要求用阀,如水、污水、废水、蒸汽、气、纸浆等介质。如果密封副采用Cr-Mn-Si硬质合金,并有耐火、防爆和防静电功能,则适合中高温介质要求,如煤气、焦炉煤气、水煤气和天然气等场合。如果密封副（半球体、阀座）和阀体流道经过碳化钨特殊工艺处理,则具有高效节能,耐磨性好,密封性能可靠,操作轻便,启闭迅速,使用寿命长等优点,是工业硅行业管道上用阀的理想选择。因其半球体与阀座瞬间脱离及瞬间压紧特性,适合介质中含有颗粒的苛刻工况,可广泛应用于冶金、选矿、电力等生产工艺中高炉煤粉喷吹、制粉系统以及除尘系统中的各种管线控制。在瞬间脱离及瞬间压紧过程中,半球体与阀座有挤切作用能除去密封面上的结垢与粘连物,能保证密封严紧可靠。是输送易沉淀结垢、结晶析出的溶液矿浆、料浆灰渣等工艺流程中两相混流体介质用阀的理想选择。 3、结语 目前,双偏心半球阀的多种规格产品已应用在不同行业的各种项目上,效果良好,并逐步在扩大使用范围。 x

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译文：
1, structural features 1.1, hemisphere Double eccentric semi-ball valve (Figure 1) of the hemispheric body double eccentric design, reliable sealing effect, instantaneous disengagement, torque, long service life. The transport of particles can be applied to the medium class in harsh conditions. The structural principle is the hemisphere (Figure 2) middle and middle-biased stem size a, and the middle seat bias size b, fully open and the valve seat when the ball completely torn off, and there is a certain gap, radius of gyration divided into Long radius and short radius, the radius of rotation in the long trajectory of the tangent with the valve seat sealing surface to form a θ angle, the valve opening and closing, the hemisphere has a relative valve seat gradually depart from the surface (see Figure in the opening 10 °, , the core has been completely out), and gradually into the role of compression, which reduces the headstock between the hemispheres when the valve seat and mechanical wear and abrasion, increased service life. 1,. Retainer 2. Valve seat 3. Hemisphere 4. Valve (2) seal between the valve seat and valve seal with a hard structure, suitable for high temperature and pressure conditions. Valve seat and valve sealing contact surface size c value is small, each sealing surface with high precision in the assembly, the retaining ring electric impact wrench to install, not only retaining ring and valve gear, prevent loosening, but also friction rotating seat meet the mechanical vibration engagement theory, so that reliable sealing valve seat and valve body. (3) and the valve seat and valve seat and valve body with two seal hemisphere, so the valve can be used in high temperature and pressure conditions. 1.3, other parts Valve overall modular design, simple structure, good reliability and high versatility. Stem with anti-emitting structure. Drive modes, stem, frame and executing agencies comply with ISO5211 standard connection size, can be directly implementing agency group with a variety of specifications. Commonly used driving method of manual, pneumatic, hydraulic, Pneumatic and electric, etc., thus enhancing the performance of dual-use eccentric semi-ball valve. 2, range Double eccentric semi-ball general industry requirements for all types of valves, such as water, sewage, waste water, steam, gas, pulp and other media. If the sealing ring Cr-Mn-Si alloy, and a fire, explosion, and anti-static feature, suitable for high-temperature media requirements, such as gas, coke oven gas, water, gas and natural gas and other occasions. If the seal pair (hemispheric body, valve seat) and the valve body flow through tungsten carbide special treatment, then with high efficiency, good wear resistance, sealing performance and reliable operation of light, open and close rapidly, and long life, is silicon industry pipeline valves ideal. And the seat of their hemisphere and the transient moment from the compression characteristics of particles for media containing harsh conditions, can be widely used in metallurgy, mineral processing, electricity production process blast furnace pulverized coal injection, milling systems and dust removal system in a variety of pipeline control. And the moment in an instant from the compression process, the hemisphere with a squeeze cutting action of the valve seat sealing surface to remove fouling and adhesion properties, can ensure a reliable seal tight. Is easy to transport scale precipitation, crystallization slurry solution, slurry and other process ash mixed in the two fluid media valves ideal. 3, Conclusion At present, the double eccentric semi-ball of a variety of specifications of products have been used in various projects in different sectors, the result is good, and gradually expand the scope of use.