CV300 Electric Series Regulating Valve

• Temperature: Ordinary Temperature
• Certification: GS
• Media: Gas, Oil, Water, Acid
• Standard: Standard
• Connection Mode: Flange
• Power: Manual
• Model NO.: CV300
• Material: Stainless Steel
• Type: Self-Operated
• Use: Adjust
• Pressure: Normal Pressure
• Port of Ningbo: Class IV (Standard, Metal Seat)
• Body Type: Straight Through, Angle, Z Shape
• Transport Package: Wooden Box
• Specification: DN15-DN500
• Trademark: xc
• Origin: China
• HS Code: 8481804090
• Production Capacity: 10000

Product Description

Electric control valve is an important unit instrument in industrial automation process control. With the increasing degree of automation in the industrial field, it is being used more and more in various industrial production fields. pneumatic control valveCompared with the traditional  has obvious advantages: electric control valve energy saving (only at work to consume electric energy), environmental protection (no carbon emissions), fast and easy to install (no complex pneumatic pipeline and air pump workstation). percentageAccording to the power used by the actuator, the valve is divided into linear characteristics, equal  characteristics and parabolic characteristics according to its function and characteristics
Main parts
Body, bonnet, packing gland, stem
Materials
Gray cast iron, cast steel, stainless steel
Input control signal
DC4-20MA or DC1-5V
 

Valve Construction

The electric actuator and regulating valve are connected and assembled by mechanical connection, debugging and installation to form an electric regulating valve.

Main parts

Parts materials: valve body, valve cover, packing gland, valve stem, valve disc, sealing ring, indicator, valve stem nut, nut sleeve
Material: gray cast iron, cast steel, stainless steel, brass

How it works

Power supply: DC24V,AC220V,AC380V and other voltage levels.
Input control signal: DC4-20MA or DC1-5V.
Feedback control signal: DC4-20MA (load electrical obstruction below 500 ohms)
By receiving the signal of the industrial automation control system (such as: 4~20mA) to drive the valve to change the cross-sectional area between the spool and the seat to control the flow, temperature, pressure and other process parameters of the pipeline medium. Realize the automatic adjustment function.
The new electric regulating valve actuator contains the feeding function, accepts the unified 4-20mA or 1-5V·DC standard signal, converts the current signal into the corresponding linear displacement, automatically controls the opening of the regulating valve, and achieves the continuous adjustment of the process parameters such as pressure, flow rate, temperature and liquid level of the fluid in the pipeline.

Flow characteristics

The flow characteristics of the electric control valve is the relationship between the relative flow of the medium flowing through the electric control valve and its opening under the condition that the pressure difference at both ends of the valve remains constant.
The flow characteristics of the electric regulating valve are: linear characteristics, equal percentage characteristics and parabolic characteristics of three kinds.

Application areas

Electric power, chemical industry, metallurgy, environmental protection, water treatment, light industry, building materials and other industrial automation systems.

Installation

The electric regulator is most suitable for installation with the upper end of the working piston under the horizontal line. The temperature sensor can be installed in any position and the entire length must be immersed in the controlled medium.
The electric regulating valve generally includes a driver, which accepts the driver signal (0-10V or 4-20MA) to control the valve for adjustment, and can also be composed of an intelligent network control system according to the control needs to optimize the control to achieve remote monitoring.

Electrical principle

Action principle: Motor power 220VAC or 380VAC, control signal 4~20mA, there is a controller inside the valve, the controller converts the current signal into the Angle stroke signal of the stepper motor, the motor rotates, by the gear, lever, or gear plus lever, drive the valve stem operation, to achieve straight stroke or Angle stroke
Feedback: the motor runs, runs through the gear, the positioning signal of the valve is output by the sliding rheostat of the tripper, in addition, there is a limit signal of the three wires (fully open, fully closed. Common wire)

Categories

ZAZP type electric through single seat regulating valve ZAZN electric through two seat regulating valve
ZAZM/P electric sleeve regulating valve
ZAZQX electric three-way combination (shunt) regulating valve
ZAZS type electric Angle regulating valve ZAZS type electric Angle regulating valve
HTNT961Y deheated water regulating valve
ZAZT, ZAZTC type electric diaphragm regulating valve
ZAZPF46-10W type electric fluorine lined bellows regulating valve
ZDLP type electronic electric single-seat regulating valve
ZDLN type electronic electric two-seat regulating valve
ZDLM(P) type electronic electric fine small sleeve regulating valve
ZDZDLPM type intelligent electric regulating valve
ZDLQ, ZDLX electronic electric three-way regulating valve
ZDLW electronic electric regulating valve

Similar products

Similar to the function of electric regulating valves are: self-operated regulating valves.
Self-operated regulating valves do not need external energy and control the temperature by adjusting the set point. When the temperature rises, the valve closes in proportion to the temperature change.
Self-operated regulator valves contain a control valve and a thermostat (containing a temperature sensor, a set point regulator, a capillary and a working piston), and electric actuators rely on selecting different temperature states for application. The temperature regulator operates on the principle of liquid expansion. If the temperature on the sensor is raised, the liquid filling will heat up and expand at the same time. The valve is closed under the action of the working piston, and the key can bemedium will be cooled. Through the set point  adjusted step by step, the electric two-way valve can be read on the scale. All thermostats are equipped with an overtemperature safety protection device.

Use Maintenance

With the rapid development of China's industry, the electric control valve in metallurgy, petrochemical and other fields are more and more widely used, its stability, reliability is also becoming more and more important, its working status will directly affect the automatic control process, this paper will elaborate the use and maintenance of electric control valve.
Electronic electric single-seat regulating valve, is composed of straight travel full electronic electric actuator and top guided through low flow resistance single-seat valve. With compact structure, light weight, sensitive action, fluid channel is streamlined S, small pressure drop loss, large valve capacity, accurate flow characteristics, directly accept the input of regulating instrument (4-20mA DC 0-10mA DC or 1-5V DC) and other control signals and single-phase power supply can control operation, to realize the automatic regulation and control of process pipeline fluid media. Widely used in the accurate control of gas, liquid, steam and other media process parameters such as pressure, flow, temperature, liquid level and other parameters to maintain at the given value.

Installation precautions

The newly designed and installed control system, in order to ensure that the regulator can work normally when driving, and make the system operate safely, the new valve should first check whether the nameplate mark on the valve is consistent with the design requirements before installation. At the same time, the following items should also be debugged.
Basic error limits; Full stroke deviation; Return difference;Dead zone ;And the amount of leakage  (performed in demanding situations).
If the regulating valve in the original system has been overhauled, in addition to the above verification, the sealing of the stuffing box and joints of the old valve should also be checked.
In field use, many are often not caused by the quality of the regulating valve itself, but by the improper installation and use of the regulating valve, such as the installation environment, installation position and direction, or the pipeline is not clean and other reasons. Therefore, the electric regulating valve should pay attention to the following aspects when installing and using:
(1) The regulating valve belongs to the field instrument, requiring that the ambient temperature should be in the range of -25 ~ 60 ° C, and the relative humidity is less than 95%. If it is installed in the open air or high temperature occasions, waterproof and cooling measures should be taken. In the place where there is a source, keep away from the vibration source or add anti-vibration measures.
(2) The regulating valve should generally be installed vertically, and in special cases it can be tilted, such as when the tilt Angle is very large or the valve itself is too heavy, the valve should be protected by adding supporting parts.
(3) The pipeline of the valve should not be too high from the ground or the floor, and the platform should be set as far as possible when the pipeline height is greater than 2 m, so as to facilitate the operation of the handwheel and facilitate maintenance.
(4) The regulating valve should be cleaned before installation of the pipeline, remove dirt and welding slag. After installation, in order to ensure that no impurities remain in the valve body, the valve should also be cleaned again, that is, all valves should be opened when entering the medium, so as not to jam impurities. After using the handwheel mechanism, it should be restored to the original neutral position.
(5) In order to make the control valve in the case of failure or maintenance so that the production process can continue, the control valve should be added by-pass pipeline.
At the same time, special attention should be paid to whether the installation position of the regulating valve meets the requirements of the process.
The installation of the electrical part of the electric regulating valve should be carried out according to the relevant electrical equipment construction requirements. If the flameproof products should be installed according to the requirements of the "Installation code for electrical equipment in explosive dangerous places". If the site wire is SBH type or other six core or eight core, the outer diameter is?? 11.3mm rubber installation cable. In the use of maintenance, it is strictly forbidden to open the cover of the explosive place and pry the flameproof surface. At the same time, do not hurt or scratch the flameproof surface during disassembly, and restore it to the original flameproof requirement state after maintenance.
The reducer of the actuator should pay attention to refueling and lubrication after disassembly and repair, and the low-speed motor is generally not disassembled, washed and refueled. After assembly, it should also be checked whether the valve position is consistent with the valve position opening indication.

Innovation

Control valve series selection system application
The reason why the valve selection software rises to the selection system, there are its innovation points:
1) With the help of the Internet, the selection system automatically transmits the ordering information of the sales outlets throughout the country to the information system of the headquarters of the enterprise, carries out sales business processing (automatic quotation, contract review, planning and scheduling, etc.), and changes the previous working mode of sending emails and then manually repeating the entry.
2) Remote automatic identification of ordered products are conventional products or special products, regulating valve product selection system can enable sales personnel outside the company and customers before signing a contract, the use of software system, automatically determine whether the selected products are special products, to provide a basis for business negotiation technology.
3) The software version can be updated remotely, and the updated information of the product can be released to the sales outlets at any time, to ensure that the sales selection personnel get the latest product data, so as to ensure that the product information selected by the selection personnel is consistent with the internal design information of the enterprise, reducing the middle of the error link.

Advantages

 

1.  

Because there is no need to debug the system, so save a lot of trouble, save a lot of time, shorten the completion date;

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2.  

Because there is no need to use valve groups and valves for layered control, so you save more pipe, insulation materials and installation costs and time;

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2.  

The water system is always in a state of balance, so no matter the installation phase construction or equipment phase use will not affect the balance of the water system.

1.  
2.  

Even if the design of the water system in some areas needs to be changed due to the change of some uses after the project is put into operation, it will not affect the design of the water system in other areas, let alone the balance of the water system in the region.

1.  
2.  

Because the whole system is in a state of dynamic balance, the refrigeration unit and the water pump will operate in the most energy saving state, saving the operation and maintenance costs.

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2.  

Because the flow balance of the system is automatically carried out, the installation and maintenance is more convenient, and the possibility of destroying the balance by human error is eliminated.

1.  

Feature use

It has the characteristics of small size, light weight, simple connection, large flow and high adjustment accuracy, and is widely used in the industrial process automatic control system of electric power, petroleum, chemical industry, metallurgy, environmental protection, light industry, teaching and scientific research equipment and other industries.
Electric regulating valve internal components: spool type: upper guide single seat (sleeve) plunger type spool
Flow characteristics: linear characteristics, equal percentage characteristics or fast opening characteristics
Material: 1Cr18Ni9Ti 0Cr18Ni12Mo2Ti
The use and function of electric regulating valve
Used to adjust the flow, pressure, temperature, liquid level and other process parameters in the field of industrial automation process control.
Electric regulating valve application range
Air conditioning, heating, ventilation, domestic hot water and other civil systems and chemical industry, petroleum metallurgy, electric power light industry and other industries in the production process of automatic control.

Key points of selection

The main control parameters of electric regulating valve selection are: nominal diameter, design nominal pressure, medium allowable temperature range, flow coefficient, etc.
For the strict occasions that require the flow rate and the opening height to be proportional to each other, special regulating valves should be used. Ball valve and butterfly valve generally coarse adjustment can be selected.
The sealing performance of the valve is one of the main indicators to evaluate the quality of the valve. The sealing performance of the valve mainly includes two aspects, namely, internal leakage and external leakage. Internal leakage refers to the degree of sealing of the medium between the seat and the closing piece. External leakage refers to the leakage of the packing part of the valve stem, the leakage of the gasket part of the middle mouth and the leakage of the valve body caused by casting defects. External leakage is not allowed to happen.
The ideal flow characteristics of the regulating valve have four kinds of fast opening, parabola, linear, and so on. It is necessary to choose the regulating valve with appropriate flow characteristics according to the actual working flow characteristics. The selection principle of flow characteristics is shown in Table 1.
Table 1 Select the characteristics of the valve according to the piping situation

Piping status	S = 1.0 ~ 0.6	S = 0.6 ~ 0.3	S < 0.3
Actual working characteristics	Straight line	Equal percentage	Straight line	Equal percentage	Controls out of place
Selected flow characteristics	Straight line	Equal percentage	Equal percentage	Equal percentage

Note: S= Pressure loss when the regulator is fully open/Total pressure loss on the series branch where the regulator is located.
In order to avoid the flow rate of water through the valve is too high and try to save the power consumption of the pump, it is appropriate to make the valve working state S≤0.7.
5. The selection of the nominal diameter of the regulating valve should be determined according to the required valve flow capacity. The nominal diameter of the regulator should not be too large or too small. Too large, increase the engineering cost, and the valve is in the low percentage range, the adjustment accuracy is reduced, so that the control performance is worse. Too small, increase the system resistance, and even when the valve is 100% open, the system still cannot meet the set capacity requirements.
6. Adjust the pressure difference of the valve and the pressure difference of the valve
For the regulating valve, its allowed adjustment pressure difference and off pressure difference is an important indicator of its selection. If the actual pressure difference is higher than the adjustment pressure difference allowed by the regulator, the valve will not be accurately adjusted, which will seriously damage the valve actuator.