Regulating Valves Manufacturers

Regulating valve, also known as control valve, is the final control element in the Regulating Valves refers to valves that perform proportional switching of 4-20ma or 0-10V signals to the valve drive，manual valves can have an open scalefield of industrial automation process control, which changes the process parameters such as medium flow, pressure, temperature and liquid level through power operation by receiving the control signal output by the regulating control unit. It is generally composed of actuator and valve. According to the stroke characteristics, the regulating valve can be divided into straight stroke and angular stroke; According to the power used by the actuator, it can be divided into three types: pneumatic control valve, electric control valve and hydraulic control valve; According to its functions and characteristics, it can be divided into linear characteristics, equal percentage characteristics and parabolic characteristics. The regulating valve is applicable to air, water, steam, various corrosive media, mud, oil and other media. English Name: control valve, the tag number usually starts with FV. Common classification of control valve: pneumatic control valve, electric control valve, hydraulic control valve and self-propelled control valve.

In the automatic control of modern chemical plants, the regulating valve plays a very important role. The production of these plants depends on the correct distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction or simple container feeding, require some final control elements to complete.
Regulating valve, also known as control valve, is the final control element in the Regulating Valves refers to valves that perform proportional switching of 4-20ma or 0-10V signals to the valve drive，manual valves can have an open scalefield of industrial automation process control, which changes the process parameters such as medium flow, pressure, temperature and liquid level through power operation by receiving the control signal output by the regulating control unit. It is generally composed of actuator and valve. According to the stRegulating valve, also known as control valve, is the final control element in the Regulating Valves refers to valves that perform proportional switching of 4-20ma or 0-10V signals to the valve drive，manual valves can have an open scalefield of industrial automation process control, which changes the process parameters such as medium flow, pressure, temperature and liquid level through power operation by receiving the control signal output by the regulating control unit. It is generally composed of actuator and valve. According to the stroke characteristics, the regulating valve can be divided into straight stroke and angular stroke; According to the power used by the actuator, it can be divided into three types: pneumatic control valve, electric control valve and hydraulic control valve; According to its functions and characteristics, it can be divided into linear characteristics, equal percentage characteristics and parabolic characteristics. The regulating valve is applicable to air, water, steam, various corrosive media, mud, oil and other media. English Name: control valve, the tag number usually starts with FV. Common classification of control valve: pneumatic control valve, electric control valve, hydraulic control valve and self-propelled control valve.roke characteristics, the regulating valve can be divided into straight stroke and angular stroke; According to the power used by the actuator, it can be divided into three types: pneumatic control valve, electric control valve and hydraulic control valve; According to its functions and characteristics, it can be divided into linear characteristics, equal percentage characteristics and parabolic characteristics. The regulating valve is applicable to air, water, steam, various corrosive media, mud, oil and other media. English Name: control valve, the tag number usually starts with FV. Common classification of control valve: pneumatic control valve, electric control valve, hydraulic control valve and self-propelled control valve.
The regulating valve acts as a variable resistance in the pipeline. It changes the turbulence of the process fluid or provides a pressure drop in the case of laminar flow, which is caused by changing the resistance or “friction” of the valve. This pressure reduction process is commonly referred to as “throttling”. For gas, it is close to isothermal adiabatic state, and the deviation depends on the non ideal degree of gas (Joule Thomson effect). In the case of liquid, the pressure is consumed by turbulent flow or viscous friction, both of which convert the pressure into heat, resulting in a slight increase in temperature.

A common control loop includes three main parts. The first part is a sensitive element, which is usually a transmitter. It is a device that can be used to measure the regulated process parameters, such as pressure, liquid level or temperature. The output of the transmitter is sent to the regulator, which determines and measures the deviation between the given value or expected value and the actual value of the process parameter, and sends the correction signal one by one to the final control element – the regulator. The valve changes the flow of the fluid and makes the process parameters reach the expected value.

The regulating valve belongs to the control valve series, and its main function is to regulate the pressure, flow, temperature and other parameters of the medium. It is the final control element in the process loop.
Valve body type

There are many kinds of valve bodies for regulating valves. The commonly used valve bodies include straight single seat, straight double seat, angle, diaphragm, small flow, three-way, eccentric rotation, butterfly, sleeve, spherical, etc.

In specific selection, the following considerations can be considered:

(1) Valve core shape and structure

It is mainly considered according to the selected flow characteristics, unbalanced force and other factors.

(2) Wear resistance

When the fluid medium is a suspension containing high concentration of abrasive particles, the internal material of the valve should be hard.

(3) Corrosion resistance

As the medium is corrosive, the valve with simple structure shall be selected as far as possible.

(4) Temperature and pressure of medium

When the temperature and pressure of the medium are high and the change is large, the valve with small temperature and pressure change on the material of the valve core and valve seat shall be selected. When the temperature is ≥ 250 ℃, the radiator shall be added.

(5) Prevent flash and cavitation

Flash and cavitation occur only in liquid media. In the actual production process, the flash and cavitation will cause vibration and noise, which will shorten the service life of the valve. Therefore, the flash and cavitation of the valve shall be prevented when selecting the valve.
Control valve actuator

In order to make the regulating valve work normally, the matched actuator shall be able to generate enough output force to ensure high sealing and valve opening.

For double acting pneumatic, hydraulic and electric actuators, there is generally no return spring. The magnitude of the force has nothing to do with its running direction. Therefore, the key to selecting the actuator is to find out the maximum output force and the rotational torque of the motor. For single acting pneumatic actuators, the output force is related to the opening of the valve, and the force on the control valve will also affect the motion characteristics. Therefore, it is required to establish force balance in the entire opening range of the control valve.

After the output force of the actuator is determined, the corresponding actuator shall be selected according to the requirements of the process use environment. When explosion-proof requirements are required on site, pneumatic actuators shall be selected. From the perspective of energy saving, electric actuators shall be selected as much as possible. If the adjustment accuracy is high, the hydraulic actuator can be selected. Such as speed regulation of transparent machine in power plant, temperature regulation and control of catalytic device reactor in oil refinery, etc.

The action mode of the control valve is only available when the pneumatic actuator is selected. Its action mode is formed by the combination of the positive and negative actions of the actuator and the valve. There are four types of combination, i.e. positive (gas closing type), positive and negative (gas opening type), reverse (gas opening type) and negative (gas closing type). The regulating valve formed by these four combinations has two modes of action: gas opening and gas closing.

The selection of the action mode of the regulating valve is mainly considered from three aspects: A. process production safety; b. Characteristics of the medium; c. Ensure product quality and minimize economic loss.

The regulating valve can be divided into straight stroke and angular stroke according to the stroke characteristics. Straight stroke includes: single seat valve, double seat valve, sleeve valve, cage valve, angle valve, three-way valve and diaphragm valve; Angular stroke includes: butterfly valve, ball valve, eccentric rotary valve and full-function ultra light regulating valve.

The control valve can be divided into manual control valve, pneumatic control valve, electric control valve and hydraulic control valve according to the driving mode, that is, the pneumatic control valve with compressed air as the power source, the electric control valve with electricity as the power source, and the hydraulic control valve with liquid medium (such as oil) pressure as the power;

According to the regulation form, it can be divided into regulation type, cut-off type and regulation cut-off type;

According to the flow characteristics, it can be divided into linear, logarithmic (percentage), parabolic and fast opening.

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