控制阀连接方案的选择

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原文：
控制阀连接方案的选择 1、控制阀与上、下游切断阀的连接有多种方式，几种常用的连接方案。图中，方案A的结构布置紧凑，占地面积小，容易维护和操作，系统的放空或排液容易。但常常不能够满足足够的直管段长度，造成噪声增强。方案B的结构占地面积较大，控制阀位置可安装在下部或上部，容易适应操作要求，但直管段长度不易保证。方案C的结构适用于角形控制阀，可减少弯头数量，占地面积较小。对底进侧出的流向，可有较长的上游直管段长度。方案D的结构与方案B类似，占地面积较大。方案E的结构适用于角形阀，与方案C比较，上游侧的直管段长度缩短，不利于流体的稳定。方案F的结构是最常见的连接结构。它占地面积大，管路阻力较小，但操作和维护空间较小。 2.泄放阀、放空阀、排污阀的连接，为便于控制阀拆卸，应在拆卸前进行阀前和阀后压力的泄放，泄放阀应安装在控制阀与上、下游切断阀之间。 3、放空阀、排污阀用于排放流体中夹带的不凝气体和冷凝液。安装时，被控流体，是气体或蒸汽时，为便于冷凝液排放，排污阀宜安装在控制阀组的最低处。被控流体是液体时，为便于不凝气体的放空，放空阀宜安装在控制阀组的最高处。 4、旁路阀。控制阀拆卸维修时，可用旁路阀对生产过程进行操作。当被控流量过大。用控制阀无法正常调节时，作为应急措施，也可用旁路阀作为控制阀的并行连接方案，对过程进行控制。为降低成本，大口径控制阀安装手轮执行机构，可代替旁路阀进行操作。旁路阀的安装应便于操作，它与控制阀上、下游切断阀一起组成控制阀组，因此，安装时应与它们配套，并同时完成施工安装。旁路阀公称直径与管道公称直径相同，耐压等级也与工艺耐压等级一致。 5、执行机构的安装通常，执行机构与控制阀阀体直接连接，但液动执行机构、长行程执行机构等执行机构与控制阀阀体分开时，安装执行机构时应注意，执行机构的连杆和机械活动部件应灵活，无松动或卡扭等现象。连杆长度应在全行程范围内动作稳定、灵活可靠。当与工艺管道有热位移的控制阀阀体连接时，应保证执行机构与控制阀阀体之间相对位置保持不变。手轮执行机构有侧装和顶装两种，安装时应留有操作空间。手轮操作应灵活，没有卡死或扭转现象。应有手轮转动方向与阀开度关系的标注。限位装置应调整合适，起到保护作用。液动执行机构应低于控制器安装，如果必须高于控制器时，其高差应不超过1.0m，并且应在管路集气处安装排气阀，靠近控制器处安装止逆阀或自动切断阀。 6、阀门定位器的安装阀门定位器的阀位检测装置与控制阀阀杆或阀轴直接连接，因此，安装时应保证反馈信号能够正确、及时反映阀位信号和变化。通常，阀门定位器与控制阀配套供应，由制造厂完成两者的连接。当生产过程控制需要添加阀门定位器时，应保证阀门定位器阀位检测装置动作的正确、可靠和灵活。反馈杆支点的机械间隙应尽量小。阀门定位器的信号管线应正确连接，气源管线和输出管线、输入管线应标记铭牌。阀门定位器的阀位显示信号应有利于操作和维护人员观测。 7、其他附件的安装其他附件包括阀位传感器、电磁阀、限位开关、继动器、电气转换器等，安装应符合产品说明书有关规定。小流量控制阀宜在上游安装过滤器。紊流严重时，应在上游侧安装整流装置。

“Self-control valve works ”是由中国控制阀网提供的阀门行业新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：自动控制阀、水力控制阀、执行器和附件、更多控制阀产品、控制阀价格等。

译文：
Control valve is the choice of connectivity solutions. A control valve on the downstream shut-off valve to connect a variety of ways, several common connectivity solutions. Figure, the structure of the program A compact layout, small footprint, easy to maintain and operate, easy system to vent or drain. But often can not meet a sufficient length of straight pipe, resulting in noise enhancement. Structure covers an area of Option B, the location of the control valve can be installed in the lower or upper, easy to adapt to the operational requirements, but the length of straight pipe is not easy to guarantee. Option C structure for angular control valve, can reduce the number of elbows, and a smaller footprint. The end of the flow into the side, may have a longer upstream straight pipe length. Option B Option D is similar to a larger area. The structure of the program E, angle valve, compared with Option C, shorten the length of straight pipe upstream side of the, is not conducive to the stability of the fluid. The structure of the program F is the most common connection structure. It covers an area of the pipeline resistance is smaller, but less space to operate and maintain. (2) relief valve, vent valve, drain valve connection, in order to facilitate the demolition control valve should be carried out prior to demolition the pressure of the bleed valve before and after the relief valve should be installed on the control valve, shut-off valve downstream room. 3, the vent valve, drain valve for the discharge fluid entrained non-condensable gases and condensate. Installation, charged with fluid, gas or steam, in order to facilitate the condensate discharge drain valve should be installed at the lowest point of the control valve. Charged fluid is a liquid, in order to facilitate the non-condensable gas venting, the vent valve should be installed on the highest point of the control valve. 4, the bypass valve. Control valve maintenance of the demolition, the available bypass valve to operate the production process. When charged with the amount of traffic. The control valve can not be normal adjustment can also be used as an emergency measure, the bypass valve as a control valve connected in parallel program, the process control. To reduce costs, control valves of large diameter handwheel implementing agencies, can replace the bypass valve to operate. The installation of the bypass valve should be easy to operate, and control valve, the downstream shut-off valve together form a control valve, the installation should be supporting them, and at the same time to complete construction and installation. The bypass valve nominal diameter pipeline same nominal diameter, pressure rating, consistent with the process pressure rating. The installation of the executive body is usually the executing agency and the control valve body directly connected, but the fluid separated from the executive body of the implementing agencies, long-stroke actuator and control valve body, install the implementing agencies should note that the implementing agencies lever and mechanical moving parts should be flexible, loose or card twist phenomenon. The connecting rod length should be stable, flexible and reliable action in the full travel range. When the process piping and thermal displacement control valve body is connected, should ensure that the relative position between the executing agency and the control valve body remains unchanged. The executive body of the hand wheel side mounted and roof-mounted, the installation should leave the room for maneuver. Handwheel operation should be flexible, not stuck or reverse the phenomenon. Label should be hand wheel rotation direction and the valve opening relations. Limit device should be adjusted to the appropriate protective effects. Hydraulic actuators should be lower than the controller is installed, must be higher than the controller, their height difference does not exceed 1.0m, and should be installed in the pipeline gathers gas exhaust valve, close to the controller to install a check valve or Automatic shut-off valve. 6, valve positioner, install the valve positioner valve position detection device and the control valve stem or valve shaft directly connected, so the installation should be to ensure that the feedback signal to correct in a timely manner to reflect the valve position signal and changes. Typically, the valve positioner and control valve supporting the supply by the manufacturer to complete the connection between the two. When the production process control need to add the valve positioner, the positioner valve position detection device action is correct, reliable and flexible. The mechanical clearance of the feedback lever fulcrum should be as small as possible. Valve locator signal line should be properly connected to the gas supply lines and output lines, the input line should be marked nameplate. The valve positioner valve position signal should be conducive to the operation and maintenance personnel observations. 7, the installation of other accessories other accessories, including valve position sensors, solenoid valves, limit switches, relay, electrical converters, etc., the installation shall comply with the relevant provisions of the product manual. The flow control valve should be installed upstream of the filter. Severe turbulence, should be installed at the upstream side rectifier unit.

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原文来源：http://www.1kongzhifa.com/

2012-02-03 06:01