原文：
             VPR气动阀门定位器(简称VPR定位器)是日本山武——霍尼韦尔公司VFR凸轮挠曲调节阀的专用附件。它按照气动调节器的信号，使调节阀正确快速动作，从而精确调节阀门流量及保证流量特性。我厂于八十年代中期引进生产，德标阀门目前已广泛应用于石化、电力、轻工与化工等行业的自控系统中。 为了正确使用与维修，需要说明其工作原理。输人信号增加后，波纹管膨胀来推动挡板(即杠杆)*近喷嘴端面。间隙减小则喷嘴背压升高，日标阀门通过继动器膜片推动阀芯下移。进气口开大排气口关小使输出压力增加，因此执行机构推杆向下移动使调节阀阀芯开启或关闭。随着阀芯转动，凸轮也转动，通过凸轮随动件拉动反馈弹簧，使挡板趋于离开喷嘴，直到波纹管产生的力矩与反馈弹簧力矩相互平衡。由于这种力矩平衡，保证了调节阀开度与输人信号之间对应关系准确，美标阀门实现了阀芯正确定位。 以下分析常见故障原因及措施。简单的排除措施将省略说明。 故障一定位器无输出压力

    1.无信号压力，①气动调节器故障；英标阀门②信号管线大量漏气。 2.波纹管大量漏气，补焊锡或更换 3.无供气压力或者供气压力过低。 4.波纹管节流孔堵塞，使用直径小于0.2mm的金属丝进行疏通。 5.定位器零点位置调节不妥，即挡板与喷嘴间隙太大。使用工具重新调节。 6.凸轮安装位置错误。ISO国际标准阀门因为一个凸轮分别包含气开式与气关式等百分比；气开式与气关式线性特性，有四个安装孔，容易装错。 7.挡板与喷嘴端面不垂直，挡板与喷嘴端面接触后仍然大量排气。 8.喷嘴孔端面有凹坑，需要更换。端面有毛刺，重新研磨。 9.喷嘴与基座粘接处漏气。

“ VPR pneumatic valve principle and the five major fault locator service ”是由中国气动阀门网提供的阀门行业新闻，译文仅供参考。另外，中国气动阀门网还提供相关产品搜索： 气动球阀、 气动蝶阀、 气动闸阀、 气动截止阀、 气动隔膜阀 等。

译文：
        VPR pneumatic valve positioner (the VPR Locator) is Yamatake - Honeywell VFR Cam flexure control valve of the special annex. It pneumatic regulator according to the signal, so that quick actionCast Gate, Globe, Check Valves right valve, the valve to accurately adjust the flow and ensure the flow characteristics. I plant in the mid-eighties the introduction of the production, has been widely used in petrochemical, power, light industry and chemical industry in the automatic control system. For proper use and maintenance, a description of how it works. Input signal increases, expansion bellows to push theBall Valves bezel (the lever) * near the nozzle end face. Gap reduces the nozzle back pressure, diaphragm actuators push through following the spool down. Large intake vents open so that the output pressure off small increase, thus putting downward movement so that implementing agencies spoolForged Gate, Globe, Check Valves valve to open or close. With the spool rotation, the cam also rotates with the moving parts driven by cam feedback spring, so that the faceplate tends to leave the nozzle until the bellows and feedback spring torque generated by torque balance each other. Because of this torque balance, ensure the valve opening and the corresponding relationship between the input signal accurately to achieve the correct positioning of the spool. The following analysis of common Resilient Seated Gate Valvescause of the malfunction and measures. Simple explanation for excluding measures will be omitted. Fault-free output pressure of a locator 1. No signal pressure, ① pneumatic regulator failure; ② signal large pipeline leak. 2. Bellows large leak, complement or replace solder 3. No air pressure or air pressure too low. 4. Bellows orifice plug, use a diameter less than 0.2mm metal wire to clear. 5. Locator zero position adjustment Automatic Control Valvesis wrong, that baffle and the nozzle gap too. Use the tool to re-adjust. 6. Cam installation location error. Because a cam were open and the gas containing gas such as percentage of the relevant type; air open-and gas-related type of linear features, there are four mounting holes, easy to install wrong. 7. Baffle and the nozzle end face is not perpendicular to the baffle and the nozzle end face contact is still a lot of exhaust. 8. Nozzle hole face a pit, to be replaced. Face a burr, re-grinding. 9. Nozzle leaking of bonding with the base.

原文来源：http://www.1qidongfamen.com/

2010-08-26 07:04

返回