(法兰式、焊接式)进口超高温球阀的球体和阀座硬化技术,球体与阀座完全采用金属对金属的密封方式，为了确保阀门在各种温度和压力下的可靠密封，针对用户的不同使用工况和要求，可以采用多种先进的球体和阀座的硬化技术，包括超音速喷涂、镍基喷焊、表面特殊硬化、硬质合金喷焊以及采用高强度高硬度陶瓷材料等，具有很好的耐磨擦、耐冲击等性能 RETZ The ball and valve seat hardening technology of (flange type, welding type) ultra-high temperature ball valve. The ball and valve seat are completely metal to metal sealing. In order to ensure the reliable sealing of the valve under various temperatures and pressures, a variety of advanced ball and valve seat hardening technologies can be used according to different operating conditions and requirements of users, including supersonic spraying, nickel based spray welding, special surface hardening Cemented carbide spray welding and the use of high-strength and high hardness ceramic materials have good wear resistance, impact resistance and other properties

采用标准Standards

设计制造Design and Manufacture∶API 6D、ASME B16.34（BS5351）、API608、MSS-SP-72

结构长度Faceto Face Dimension∶ ASME B16.10、API 6D 

法兰连接Flange Connection Dimension∶ ASME B16.5 

对焊端BW Connection Dimension∶ ASME B16.25 

检验和试验 Test and Inspection∶ API 598、API 6D 

防火结构设计Fire-safe Design∶API 607

(法兰式、焊接式)进口超高温球阀性能描述 Performance description

金属硬密封球阀的主要技术解决方案: Metal Seated Ball Valve technical solutions:

A: 超音速火焰喷涂技术： 一般涂层厚度在: 0.3mm左右, 硬度可以达到HRC74以上, 结合力在68~76MPa左右.主要喷涂的材料有: 碳化钨钴, 碳化钨钴铬, 镍基合金, 碳化铬, 陶瓷等 retz品牌  kness normally: 0.3mm, Hardness higher than HRC74 Binding Force between: 68~76 Mpa.HVOF Material: Tungsten carbide Cobalt, Tungsten carbide cobalt chromium, Nickel base Alloy, Chromium carbide, Ceramic and so on.

B: 镍基合金热喷焊技术： 一般涂层厚度在: 0.5~1.0mm左右, 硬度可以达到HRC55~65, 结合力在400MPa左右镍基合金主要特点: 耐磨, 耐腐蚀, 耐高温等Spray Welding Nickel Base Alloy The thickness of welding normally: 0.5~1.0mm, Hardness between: HRC 55~65 Binding Force nearly 400Mpa.Feature: Abrasion Resistance, Corrosion Resistance, High Temperature Resistance

球体的圆度及加工制造工艺 The Roundness of ball and the machining process.

在高压差工况下,如果阀门存在一定的泄漏量,在阀门泄漏部位很容易被高速流动的介质冲刷,从而发生更大的泄漏.. 因此球体的圆度直接关系到阀门的密封性能 Under the condition of high pressure difference, if the valve has a certain amount of leakage, it is easy to be flushed by the high-speed medium at the valve leakage position, thus causing greater leakage. Therefore, the roundness of the ball is directly related to the sealing performance of the valve

对于喷涂后的球体先采用数控球面磨床进行加工, 然后采用球面的研磨机进行精密研磨, 再通过三维坐标测量仪的检测, 确保球体的圆度在0.02mm以内 For the coated sphere, the CNC spherical grinder shall be used for processing, and then the spherical grinder shall be used for precision grinding. The roundness of the sphere shall be within 0.02mm through the detection of three-dimensional coordinate measuring instrument

金属材料高温下的热膨胀 Material thermal expansion in high temperature

金属硬密封球阀通常应用在高温工况, 必须考虑到材料在高温下的热膨胀.通常在阀座背后设置弹簧, 通过弹簧来调整和补偿高温下材料的膨胀问题.

In high temperature working application, the valve seat and ball can easily get stuck due to thermal expansion, and the valve could not be open or closed.Chaozhong’s metal seated ball valve design came from beveling spring loading seat, which can absorb the thermal expansion from the ball and seat.It can provides a easily operation and without a stuck risk.

硬密封球阀密封面的磨损问题 Friction Problem in Metal Seated Ball Valve

球阀在全开状态下, 流阻系数最小, 而且阀座和球体没有暴露在流动的介质中. 因此基本没有磨损和冲刷的问题.在关闭状态下的球阀, 如果阀门完全密封, 管路中的介质没有流动, 阀门也不会被磨损和冲刷.但是在球体刚开启时, 阀座与球体最先分离的部位, 由于管路两端压差很大, 介质流速很高, 此时最容易被磨损. 针对此问题, 我们有以下措施减缓阀门的磨损 Swash and attrition from soild particle When valve is full open, the seat and ball not exposed to the flow.When valve is full close, the medium is stop, there is no swash and attrition on the valve.It provide basically no swash and attrition.When valve start opening, the area which ball separte the seat is easlier to been attrition casue the pressure difference and flow speed of medium.To slove this problem we have bellow soluation:

A: 提高阀门的启闭速度可以有效的减少阀门的磨损, 尤其是开关频繁的球阀 Increase the open/close speed to reduce the valve’s friction, specifci the frequently operation valves

B: 在开启球阀前通过旁通阀对球阀前后的压力进行平衡  Through a bypass system to balance the pressure difference

C: 适当的增大球体的直径, 使球体的密封部位不容易被磨损, 即使出现了磨损, 也不会影响阀门的密封性能Appropriate increase the ball dimension, it provide the sealing face is not easy to swash.Even with a attrition, does not affect the sealing performance of the valve

D: 在球体和阀座容易被磨损的部位喷焊耐磨材料 Coating a higher wear resistant on the area which will be easy to been attrition on the seat and ball.

固定式硬密封球阀下阀轴与球体的配合间隙 Clearance between ball and stem Metal Seated Trunnion Mounted 

固定式硬密封球阀采用上下支撑轴定位的结构设计, 上下支撑轴与阀体静配合.不会因为介质在球体关闭时的巨大推力发生一定的倾斜. 从而可以有效的控制扭矩, 并减少发生泄漏的可能.

Ball Valve within support shaft construction.The shaft install with body by bolts.It provide position the ball no move and also avoid tilt with ball when meidum thrust on the ball when valve in closing. Can be effectively control the torque, and reduce the possibility of a leakage.

防火结构 Inherent fire safe construction.

硬密封球阀的密封面采用金属对金属密封结构,填料采用柔性石墨, 垫片采用不锈钢缠绕石墨结构.因此即使阀门在火灾等异常情况下也能确保可靠的密封

The metal seated ball valve ‘s seal surface came from a metal to metal construction, a graphite packing and the gasket between bodies made of S.S spiral wound with graphite.This design provides a inherent fire safe construction, the valve can assure reliable tightness even if under fire condition

防静电结构 Inherent anti-static construction

硬密封球阀的阀体,阀座,球体等金属零件紧密接触,自然行程了静电通道.因此,金属硬密封球阀不需要额外设置专门的防静电装置 

Metal seated ball valve construction includes: valve body, seat, ball, and other metal material parts, All of those contact together closely provide a inherent anti-static system

双阻双排放 Double-block and bleed 

硬密封固定球阀一般采用球前阀座密封结构. 硬密封球阀的两个阀座能独立切断进口段和出口端的介质, 实现双阻断功能.当球阀关闭时, 即使阀门进出口两端同时受压, 阀门中腔和两端通道也可以被相互阻断, 中腔内的剩余介质可以通过些泄放阀排除.硬密封浮动球阀采用球后阀座密封结构, 一般采用单向密封, 并在阀体上标有流向.如客户有特殊要求, 也可以采用双向密封结构

Double block and bleed function Each seat shuts off the process media independently on the upstream and downstream side of the ball, allowing double block operation.When the pressure is simultaneously applied to both sides of the ball when in the closed position, the valve bore and body cavity will be isolated from each other, and the pressure within the body cavity can be released through the relief valve

主要零部件材料 Main parts and materials