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04

2016-04

Precautions for Selecting Valves Under Various Operating Conditions

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2016-04-29

1. Matters Requiring Attention in the Selection of Standard Valves Valve Usage Requirements ① Ordinary gate valves, ball valves, and globe valves, by their structural design, are strictly prohibited from being used for regulation. However, in process design, they are commonly employed for regulating purposes. When used for regulation, the valve’s sealing elements remain in a throttling state for extended periods, during which impurities in the fluid erode the seals and damage the sealing surfaces, leading to poor shut-off or, in an attempt by operators to compensate for damaged sealing surfaces and achieve tight closure, to over‑closing or over‑opening of the valve. ② Improper installation location of valves: when the service medium contains impurities, failure to install a filter or strainer upstream of the valve allows these impurities to enter the valve interior, resulting in…

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05

2016-05

On-board Charger “User Manual for the Handheld Operator”

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2016-05-10

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07

2017-07

What is the principle of a valve positioner?

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2017-07-07

Principle of the valve positioner: The feedback lever detects changes in the valve opening position. When the electromagnetic torque generated by the input signal equals the torque produced by the positioner’s feedback system, the positioner’s force-balance system reaches equilibrium, and the positioner stabilizes. At this point, the input signal is proportionally related to the valve position. However, if the input signal changes or external forces such as fluid flow act on the system, the balance of the force-balance system is disrupted, resulting in an imbalance between the force exerted by the magneto-electric assembly and the force generated in the feedback loop due to changes in the valve stem position. A wide variety of valve positioners are used in field applications, including pneumatic valve positioners and electric…

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07

2017-07

Valve Positioner Selection Guide

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2017-07-11

A valve positioner (also known as a pneumatic valve positioner) is a key accessory for control valves and is typically used in conjunction with pneumatic control valves. It receives the output signal from the controller and uses this signal to regulate the pneumatic control valve. Once the control valve actuates, the displacement of the valve stem is fed back to the positioner via a mechanical linkage, and the valve position is transmitted to the higher-level control system in the form of an electrical signal. In numerous control applications, the valve positioner is one of the most important accessories for control valves. Particularly when selecting the most suitable valve positioner for a specific application, the following factors should be carefully considered: 1) Valve positioning

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07

2017-07

How is the valve positioned by the valve positioner?

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2017-07-18

Valve positioners are classified according to their input signals into pneumatic valve positioners, electric valve positioners, and smart valve positioners. Pneumatic valve positioners receive standard pneumatic signals as input—for example, a 20–100 kPa pneumatic signal—and their output is also a standard pneumatic signal. Electric valve positioners, on the other hand, accept standard current or voltage signals as input—such as a 4–20 mA current signal or a 1–5 V voltage signal—and internally convert these electrical signals into electromagnetic force before generating a pneumatic output to drive the pilot control valve. Based on the direction of operation, valve positioners can be further categorized into single-action valve positioners and double-action valve positioners. Single-action valve position

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07

2017-07

How to Select a Valve Positioner

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2017-07-20

Among the many control applications, valve positioners are one of the most important accessories for control valves. In particular, when selecting the most suitable valve positioner for a specific application, the following factors should be carefully considered: 1) Whether the valve positioner can implement “split-ranging,” and how easy and convenient it is to do so. The “split-ranging” function means that the valve positioner responds only to a specific range of the input signal (e.g., 4–12 mA or 0.02–0.06 MPaG). Therefore, if “split-ranging” is available, it allows the system to be tailored to actual needs,

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