行业新闻
原文：
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 action right Butterfly Valves
valve, the valve to accurately adjust the flow and ensure the flow characteristics. Introduced in the mid-eighties 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 the bezel (the lever) * near the nozzle end. 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 spool valve to open or close. With the spool rotation, the cam also rotates with the moving parts driven byForged Steel Valves
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. Play a role on the industry Web site, industry information to inform the work of
The following analysis of common cause of the malfunction and measures. SimpleSafety valves
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 wireGauge Valves
to clear.
5. Locator zero position adjustment is 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 theReducing Valves
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
原文来自： http://www.shreveporttimes.com/article/20091205/NEWS01/91205007/1060
“Gas line valve release investigated”是由 上海天阀实业有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：
中国调节阀网 调节阀产品 调节阀知识 调节阀厂商 调节阀博客 调节阀行业新闻
以下是参考译文：
译文：气动阀门的工作原理和定位器五大故障维修
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凸轮挠曲化工泵
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。于八十年代中期引进生产，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，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，实现了阀芯正确定位。 关于发挥行业网站作用、推进行业信息工作的通知
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；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。使用排污泵
工具重新调节。
6.凸轮安装位置错误。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，挡板与喷嘴端面真空泵
接触后仍然大量排气。
8.喷嘴孔端面有凹坑，需要油泵
更换。端面有毛刺，重新研磨。
9.喷嘴与基座粘接处漏气
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