主要零件和材质 Main parts and materials

产品结构特点 afeatures

1)密封比压高：水煤浆工况用硬密封球阀由于采用金属材料为密封面，所需要的密封比压比软。
 密封要高得多：因此如何从设计上保证适当的密封比压，提高零件的形位公差以及提高表面光洁度要求是十分重要的。
 2)球体表面硬度高：煤粉颗粒的硬度较高，此工况情形下，在阀门关闭的状态时要求球体表面。
 硬度层有较高的硬度,否则,当阀门开启的过程中会有煤粉颗粒镶嵌在球体表面上，
 从而破坏球体表面,以至于影响到阀门的整体密封性能。
 3)喷焊层结合强度高：煤粉在管线中的流动速度很快，因此要求球体密封面必须有较高的硬度。
 和强度,同时还要求所喷焊的密封材料和基体材料有较高的结合强度，以及基体材料本身的强度较好，这样喷焊层才不能从基体表面脱落，而失去密封性能。
 4)自洁功能：煤浆的吸附性较强，容易粘在球体表面上。在阀门启闭过程中，介质颗粒被带到。
 阀座与球体的密封面之间，破坏了球体与阀座之间的密封副，从而影响阀门的密封性能，使阀门的使用寿命大大缩短。这就要求阀门具有很好的“自洁”功能，从而保证球体和阀座密封副不被破坏。
 5)加工难：由于水煤浆工况用硬密封球阀的密封表面均采用超硬材料或表面硬化处理，用普通刀具无法加工,即使能加工其加工精度也不能满足要求，同时还要求加工设备具有足够的强度，因此选择合适的刀具非常重要。

1) The sealing ratio is higher than the pressure: the sealing ball valve in the working conditions of the coal slurry USES the metal material as the sealing cover and the required sealing ratio is softer than the pressure ratio.
 The sealing is much higher: therefore, it is very important to ensure proper sealing ratio of the design, improve the position tolerance of the parts and improve the surface finish.
 2) The surface hardness of the ball is high: the hardness of coal particles is higher, and the surface of the sphere is required when the valve is closed in this condition.
 Hardness layer has high hardness, otherwise, when the valve is opened in the process of coal particles are embedded in a sphere surface, undermining the sphere surface, that affect the overall sealing performance of the valve.
 3) The bonding strength of the spray welding layer is high: the coal powder is flowing fast in the pipeline, so it is necessary to have a high hardness on the sealing surface of the ball.
 And intensity, and at the same time also requires the spray welding sealing material and base material has high bonding strength, and the strength of the
 substrate material itself is good, so just can't fall off from the substrate surface spray welding layer, and lose the sealing performance.
 4) Self-cleaning function: the adsorption properties of coal pulp are strong and easy to stick to the surface of the ball. During the valve opening process, the medium particles are carried.
 Between the seat and the ball's sealing surface, the seal between the ball and the seat is broken, which affects the sealing performance of the valve and greatly reduces the service life of the valve. This requires the valve to have a good "self-cleaning" function to ensure that the ball and seat seal are not damaged.
5) Processing hard: as the working condition of coal water slurry with hard seal ball valve sealing surface adopt superhard material or surface hardening treatment, use common tool will not be able to process, even to the machining precision can't meet the requirements, at the same time also require processing equipment has enough strength, therefore is very important to choose the appropriate tools.

技术规范 Technical specification

试验压力 Test prssure

球阀结构长度和外接尺寸 Main connection dimensions