When the electrical valve positioner is used, we need to understand its operating principle, and after understanding, install and use it according to the principle, so as to obtain accurate data. Then the editor below will introduce you to the relevant knowledge of valve positioner.
The operating principle of the electrical valve positioner:
In order to open the valve to increase the current signal, the torque motor generates an electromagnetic field, and the baffle is driven away from the nozzle by the electromagnetic field. The distance between the nozzle and the baffle is increased, and the air pressure above the spool inside the pilot valve is discharged. Affected by this, the spool moves to the right, pushing the spool that blocks the base, and the air pressure is input to the actuator through the base.
As the internal pressure of the actuator air chamber increases, the actuator push rod descends, and the displacement change of the actuator push rod is transmitted to the slide plate through the feedback rod. This displacement change is transmitted to the range feedback lever, which pulls the range spring.
When the force of the span spring and the torque motor is balanced, the baffle returns to its original position, reducing the distance from the nozzle, and as the amount of air discharged through the nozzle decreases, the air pressure above the bobbin increases, the bobbin returns to its original position, and the valve core re-blocks the base, stopping the air pressure input to the actuator. When the movement of the actuator stops, the positioner remains steady.
When installing the electrical valve positioner, please observe the following precautions: in order to prevent the system from shutting down, the control valve should be isolated from the system through a bypass valve-like device; There can be no air pressure inside the actuator; All air and input signals from the valve actuator and other peripheral accessories must be completely cut off prior to installation.
The above introduces the basic knowledge of the electrical valve positioner, and I hope it will be helpful to you in the later use.
|
More on that
|
Fisher - As global demand for valves increases, opportunities and challenges coexist for valve suppliers
The world's water treatment equipment giant United States Watts Industrial Group recently made a forecast that the total annual demand of China's valve market is not less than 10 billion yuan. According to the scientific concept of development, in order to ensure the coordinated development of the economy and improve the people's living standards in the future, China will inevitably build infrastructure, such as water.
|
|
Fisher control valves
Fisher control valves are divided into electric control valves, pneumatic control valves and manual control valves, and the following mainly introduces pneumatic control valves and electric control valves.
Fisher pneumatic control valve is based on compressed air as the power source, cylinder as the actuator, and with the help of electric/pneumatic valve positioner, converter, ...
|
|
Fisher – Eight Misconceptions About Using Pipeline Pumps
1. The pipeline of the pipeline centrifugal pump is matched
Some users of pipeline centrifugal pumps think that this can improve the actual head, but in fact, the actual head of the pump = total head - loss head. When the pump model is determined, the total head is fixed; The loss head is mainly due to the resistance of the pipeline, and the smaller the pipe diameter ...
|
|
Fisher - Valve installation, maintenance, and operation
To extend the life of a Fisher valve, most of us pay attention to installation and maintenance, but operation is also important. For valves, it is necessary to be able not only to install and maintain, but also to operate. Dongguang valve pointed out: valve installation, maintenance, operation, no one is missing...
|
|
Industrial Automation - Reason for the Popularity of Smart Valve Positioner Fisher(DVC2000/6200)
Fisher (DVC2000/6200) intelligent valve positioner, just we have the quantity, good price, high quality, choose Dr. Xiangjing valve instrument inventory dealer, is your wise choice, there is a first-class technical team to escort you.
With the process of industrial automation, the ...
|
|
Emerson has appointed Peter Zornio as Chief Technology Officer
Zornio, a veteran automation and software leader, drives Emerson's innovation and technology strategy
ST. LOUIS (November 29, 2022) – Emerson (NYSE: EMR), a global leader in automation technology and software, has appointed Peter Zornio as a ...
|
|
Fisher - Fisher Fisher controller trivia sharing
There are many different types of Fisher Fisher controllers, and today I will share with you some small knowledge of Fisher valve controllers.
Fisher Fisher Valve Controller Classification:
Pneumatically operated valves are operated by means of a positioner to receive an input signal from the process controller.
|
|
Emerson introduces the healthcare industry's first integrated manifold solution for respiratory therapy equipment
ASCO Series 588 manifolds will reduce engineering and installation timelines for manufacturers, improving energy efficiency, product life and equipment reliability
FLORHAM PARK, NJ (July 19, 2023) — Emerson has released the ASCO™ Series 588 benchtop oxygen concentrator manifold, which is a medical ...
|
|
Fisher Fisher - Teaches you how to improve the life of your valves
In the valve design or use experience, the lifting valve packing is mostly asbestos packing or graphite packing or PTFE V-type packing, but these packings are limited by the number of valve opening and closing, that is, with the increase of the number of valve opening and closing, the packing will wear out, and the gap will gradually increase, to a certain number of times.
|
|
Fisher Fisher - Butterfly Valve Test & Installation & Troubleshooting
1. Testing and adjustment
1. Whether it is manual, pneumatic, hydraulic or electric, all parts of this product have been seriously debugged before leaving the factory, and the user should uniformly fix both ends of the import and export when re-checking the sealing function
Fixed, close the disc valve, apply pressure to the inlet side, and check whether there is any leakage on the outlet side, ...
|
|
Fisher Fisher - The online platform has become a new marketing channel for the Fisher valve industry
The power of Fisher is huge, the power of example is infinite, in today's market to achieve a better survival of our goods, we must have the characteristics of our own products, from the development of our valve industry, in the current market, such equipment ...
|
|
Fisher Fisher - What role butterfly valves play in today's industry
Butterfly valve is used in industry, its characteristics can withstand high temperature, the applicable pressure range is also high, the valve nominal diameter is large, the valve body is made of carbon steel, and the sealing ring of the valve plate is made of metal ring instead of rubber ring. The butterfly valve is a circular butterfly plate as the opening and closing part and rotates with the valve stem to open, close and adjust the fluid.
|
|
Fisher Fisher - Performance comparison of electric control valves and pneumatic control valves
Performance characteristics of electric control valves
The electric control valve is composed of a combination of electric actuator and control valve, and its main features are:
1. Light weight and beautiful appearance.
2. Functionally, it can replace many products with incomplete functions, simplify the modeling, and solve the complex factory management, complex selection, ...
|
|
Inlet and outlet piping design of the pump
Cavitation: When the static pressure of the liquid entering the first-class impeller in the pump is lower than or equal to the saturated vapor pressure at this temperature, the liquid vaporizes and produces bubbles. This vaporization and condensation produce ...
|
|
Fisher Fisher - Introduction to commonly used valve sealing face materials
1. Soft sealing material
(1) Butadiene rubber (NBR). Butadiene rubber has excellent oil resistance; The heat resistance is better than that of natural rubber and styrene-butadiene rubber; Good air tightness and water resistance. Dingjing rubber can be divided into Dingjing-18, Dingjing-26 and Dingjing-40. Xiangjing rubber is suitable for temperatures from -60 to +120 degrees ...
|
|
Fisher Fisher - Analysis of the future trends of global valve products
With the development of large-scale complete sets of foreign technology, a series of new complete sets of equipment and stand-alone machines have emerged. The development of new sets of valve-related complete equipment is characterized by large-scale, high-parameter, high-performance automation and complete sets, which are compatible with the control mode of these complete sets of equipment. In the past 20 years, the country ...
|
|
Fisher Fisher – Overcoming the difficulty of selecting control valve trims
Rules of thumb for flow characterization selection
Different applications favor different valve flow characteristics. These rules of thumb do not cover all situations, but they can address many of the typical situations encountered in the process industry.
Linear control valves are often chosen for pressure control, including near-constant ...
|
|
Fisher Fisher - Dead Band Adjustment for Electric Actuators
1. Definition of dead zone
In the field of instrumentation, it is also known as the insensitive area of the instrument. A finite interval in which a change in the input does not cause any perceptible change in the output of the instrument. The dead zone is mainly caused by friction and intermittent intermittent between the internal components of the instrument.
In the field of valves, valves are dead ...
|
|
Fisher Fisher – filters, pressure reducing valves, lubricators
The filter, pressure reducing valve and lubricator together form a pneumatic triplet. The filter is mainly responsible for filtering liquid water, oil and impurities in the compressed air, the pressure reducing valve is mainly responsible for controlling the system pressure, and the lubricator is responsible for the oil lubrication of the back-end components. In general, the lubricator is not used much, because ...
|
|
Classification and precautions for use of Fisher valve positioners
Fisher Fisher Valve Positioner Type, according to the structure, is divided into Fisher 3660/3661/3710/Pneumatic Valve Positioner, FISHER3528I Electric-Pneumatic Valve Positioner and Fisher DVC6200/DVC2000 Digital Intelligent Valve Positioner, which has single acting and double acting, and is the main attachment of the control valve.
|
|
Contact
working hours
