控制阀安装位置和方位

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原文：
控制阀安装位置和方位： 1、按照设计图纸和设计文件的规定，安装位置应具有足够的操作空间，用于安装、操作和维护；其位置应避免安装在有振动、潮湿、易受机械损伤、有强电磁干扰、高温、温度变化剧烈和有腐蚀性气体的场所；安装应牢固、平整；安装方位应使控制阀的执行机构在调节机构上部，图6—8显示了直行程控制阀的各种安装方位。其中，位置有是首选的位置、次选的位置。 2、控制阀内流体的流向控制阀内流体的流向应与控制阀阀体上标注的箭头一致。特殊情况下可不受本规定的限制。 3、控制阀连接控制阀的连接有螺纹连接、法兰连接和焊接连接等。螺纹连接用于小口径控制阀，安装螺纹连接的控制阀时，必须同时安装可拆卸的活动连接件。法兰连接有法兰连接和夹持式连接两种，连接法兰的公称直径应与控制阀的接管直径一致。法兰也有不同耐压等级，法兰的耐压等级应与控制阀耐压等级一致。法兰内径应与管道内径相等。法兰面与管道轴线的垂直度允许偏差为l°。法兰密封面应平齐。法兰与管道的同轴度允许偏差t应满足： t≤0.015D（1/β）（6—27）式中，D是管道内径；夕是工作条件下节流件内径与管道内径之比。法兰连接时应受力均匀合适，避免局部受到过大压力。尽量避免采用焊接连接，焊接连接时必须同时安装可拆卸的活动连接件。控制阀连接时，不应使连接管道内部引成新的凸出物。例如，密封垫片、焊接缝等不应在管道内凸出。 4、控制阀与上、下游切断阀、旁路阀的连接控制阀上、下游切断阀和旁路阀应与控制阀同时安装。上、下游切断阀与控制阀之间的管段长度应考虑管路阻力和对流体流动状态的影响。直管段长度长，有利于流体经切断阀后的稳定，可使流体流动平稳，减少紊流影响，降低噪声；直管段长度短，流体经切断阀后还未稳定就进入控制阀，使噪声增强，但管段长度短有利于降低管路阻力，提高控制阀两端压降，使流量特性的畸变减小，有利于控制系统的稳定运行。因此，应权衡和综合考虑。通常，上游侧应有10D～20D的直管段，下游侧有3D～7D的直管段。D是管道公称直径，必要时应设置整流装置。

“Control valve position and orientation ”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 position and orientation: 1, in accordance with design drawings and design documents, installation location should have sufficient operating space for installation, operation and maintenance; its location should be avoided in a vibration, moisture, susceptible to mechanical damage, there is strong electromagnetic interference, high-temperature , severe temperature changes and corrosive gases; installation should be strong, smooth; control valve should be installed position of the upper part of the implementing agencies in the regulation of body, Figure 6-8 shows a variety of direct travel control valve installation position. Among them, there is the preferred location of the position, the second best position. 2, the fluid flow control valve within the fluid flow control valve and control valve should be marked on the arrow on the valve body. The special circumstances are not the limits. 3, the control valve to connect the control valve connected to threaded connections, flange connections and solder connections. Threaded connection for small-caliber control valves, control valves installed threaded connection, you must also install removable connectors activity. Flange with flange and clamp connecting the two, the nominal diameter of the flange connections and control valves should be taken over the same diameter. Flanges have different voltage levels, flange pressure rating should be consistent with the level of pressure control valve. Flange diameter pipe diameter should be equal. Flange surface and the vertical axis of the pipeline to allow deviation of l °. Flange sealing surface should be flush. Coaxial with the pipe flange tolerance t should satisfy: t ≤ 0.015D (1 / β) (6-27) where, D is the pipe diameter; evening was cutting pieces of work under the conditions of the ratio of diameter and pipe diameter . Flange force uniform should be appropriate to avoid excessive pressure by the local. Avoid use of welded connections, welded connections must be installed detachable connection activities. Control valve connection, connection pipe should not be cited as the new internal projections. For example, the sealing gasket, welded joints and other projections should not be in the pipeline. 4, the control valve with upstream and downstream shut-off valve, bypass valve connecting the control valve on the downstream shut-off valve and bypass valve and control valve should be installed. Upstream and downstream shut-off valve and control valve length of pipe between the pipe should be considered for the fluid flow resistance and the impact of the state. Length of straight pipe length is conducive to the fluid through the valve off the stability of steady fluid flow can reduce the turbulence effect, reduce noise; straight pipe length is short, after the fluid has not been stable through the shut-off valve to enter the control valve, so that the noise enhancement However, the short length of pipe line will help to reduce resistance and improve the voltage drop across the control valve, reducing the flow characteristics of the distortion, is conducive to stable operation of the control system. Therefore, we should weigh and consider. Typically, the upstream side should be 10D ~ 20D of straight pipe upstream and downstream side of 3D ~ 7D of the straight pipe. D is the nominal pipe diameter, as necessary, set the rectifier unit.

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原文来源：http://www.1kongzhifa.com/

2011-12-22 05:33