Wenzhou EAA Electric Co Ltd — valve positioners, I/P transducers and limit switches built to the patterns your plant already runs [email protected] +86 577 6516 5096
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Valve Positioner and Transducer Knowledge Centre

Reference articles for instrument technicians, valve shops and buyers. Written around the questions we get asked before an order, not around keywords.

Product Guide What A Valve Positioner Is and When You Need One The plain explanation of what a positioner does on a control valve, why it is fitted, and the situations where a valve will not control properly without one. Read Article →
Process Guide How A Valve Positioner Works Step By Step The force balance principle behind a pneumatic valve positioner, how the feedback linkage closes the loop at the valve, and what happens inside the unit when the input signal changes. Read Article →
Buying Guide Types of Valve Positioner and How To Choose Between Them Pneumatic, electro pneumatic and smart positioners, single acting against double acting, and linear against rotary. What each classification actually changes for the buyer. Read Article →
Comparison Article Electro Pneumatic Positioner Against Pneumatic Positioner The practical differences between a positioner that takes an air signal and one that takes a current signal, and which one belongs on a modern control loop. Read Article →
Process Guide How A Pneumatic Valve Actuator Works The working principle of a pneumatic valve actuator, the relationship between air pressure, spring force and stem travel, and where the positioner fits into that chain. Read Article →
Product Guide The Parts of A Pneumatic Valve Actuator A component by component walk through a pneumatic valve actuator, so you know what you are looking at when you specify accessories or troubleshoot a valve that will not move. Read Article →
Installation Guide YT1000L Valve Positioner Installation Mounting and connection reference for the YT1000L linear valve positioner, including the published installation drawing from the original catalogue. Read Article →
Installation Guide YT1000R Valve Positioner Installation Mounting and connection reference for the YT1000R rotary valve positioner, including the published installation drawing from the original catalogue. Read Article →
Comparison Article I/P Transducer Against Valve Positioner Which One To Fit The single most common ordering mistake is buying a transducer when the job needs a positioner. Here is the distinction and how to decide from what the valve is doing. Read Article →
FAQ

About These Guides

Who writes these articles?

Our own sales and technical staff, based on the questions buyers actually ask before an order. They are reference notes, not marketing copy.

Can I use this to specify a unit for my valve?

Use it to narrow down whether you need a positioner or a transducer, and which pattern. Then send a photo of the valve and the existing instrument so we can confirm the exact model.

Where do the technical details come from?

From the series datasheets on our downloads page and from the product documentation we publish. Where a figure is not in those documents, we do not state it.

Do you have installation instructions for a specific model?

The YT1000L and YT1000R installation drawings are published here. For other models, ask on WhatsApp and we will send what applies to your unit.

Can you help troubleshoot a valve that will not control?

Send a short video of the valve responding to a signal change plus a photo of the instrument. Most cases come down to air quality, air pressure or a linkage that has slipped.

Still Not Sure Which Unit You Need

Send a photo of the valve and the old instrument. We will tell you which model matches, or tell you that we do not have one.

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