Pipeline valve under what circumstances do you need to enter the PLC

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

In the case of remote control.

The contact point in the switch enters the PLC to better monitor the fault of the valve in operation, such as 30 seconds and 60 seconds have not been disengaged, indicating that the valve has a card fault. You can also use the switch in place and the time to judge, depending on how you design.

The stop button is used when it is misoperated or when it does not need to be fully on or off, and I personally think it is necessary.

Be prepared for any trouble

It is completely OK to use a control instrument without PLC.

Do you know how many types of electric valves there are? Electric valves can be divided into adjustment type and switch type, and the adjustment is divided into 4 20mA adjustment and 1k adjustment. Look at the name should be able to see that the switch type does not need to stop in the middle, if you want to stop, you can use the adjustable one, and you can also see the valve opening when adjusting.

And then there's valve control, it depends on your control system, it depends on how your system is designed, and the on/off valve can be designed to stop in the middle, but it's not necessary.

Point 2 The valve switch has a time of 30 seconds and 60 seconds (the time of the valve switch).

Some of these are personal habits, and the design process is simple and reliable, not necessarily what others have to have.

I don't know what PLC you use, this is the program of Siemens 200 Make a set reset switch button on the configuration screen (upper computer control screen), link variable this button function: 1 when pressed, 0 when pressed again).

Make two indicators in the configuration screen, link them separately, read directly, status, no programming).

I don't understand the function.

You can add a startup condition between and as a startup button.

This is a very simple program.,It's the basic start and stop.,Plus the fault alarm protection in place.,Have you learned PLC programming?,54 62 32134 QQ

Crown valve pushing.

All valves need to be installed on the pipeline, and only the following points can be roughly distinguished: Cast iron valves are ordinary water. Fire water tap water cast steel valves are used in chemical industry.

Stainless steel valves are used for corrosive ones.

That's pretty much it.

There's a request. Very professional and varied.

But at least the requirements are: it can be operated and easy to maintain. The landlord is engaged in design, or do you want to summarize this aspect of the stuff and write a **?

It depends on the specific installation location, and it is generally designed by the design institute.

Switch valve, two inputs, two outputs on the line, respectively open in place, close in place, open the valve, close the valve on the line. Regulating valve, one analog input, one analog output is enough, and there is no need for a signal in place. In the field, the regulating valve does not have a shut-off function, so if the signal is not in place, only the valve opening needs to be collected.

The switching quantity is a point, on/off, a little can represent on, no electricity represents off, equivalent to 1 and 0; The valve signal is a point, a switch, the general solenoid valve is a point, these with PLC an output point is enough, the switch to detect this valve with a PLC input point is enough, some valves are proportional valves, at this time you need to give the analog quantity, that is, with the analog module to achieve.

It's up to you to see the process requirements! If you need to operate ajar and remotely on the spot, you can operate 3 inputs and 2 outputs! They are: centralized, on-in-place, and off-in-place output is an on-command, off-command.

If it's an electric input, it has to be a fault signal!

There are many valves, some of which are analog, but 2 are controlled by digital outputs. There are also analog control analog feedback.

It's mainly about the process!

Thinking too much, I will say the simplest Oh, called automatic reset, one signal controls the opening or closing of the solenoid valve, and the other can be reset with a spring or other reset. As long as the parameters are reasonably designed, it is feasible.

To be complex, please refer to:

The on-off valve status signals (inputs) usually are: local remote, comprehensive fault, running, on, closing, fully on, and fully closed. Commands (outputs) usually have:

On, off, and stop. The status signal is generally a switching (digital) signal (0 1) adjustment type valve, the valve opening is usually a 4 20 mA signal (analog), and the command is generally a 4 20 mA signal (analog), corresponding to an opening of 0% 100%.

Field status signals--- DI module (digital input module) - CPU --- human-machine interface (at this time the status is seen from the HMI).

Human-machine interface (command issued from HMI) - CPU --- DO module (digital output module) - field device (at this time the device makes corresponding actions).

First of all, the system samples the temperature at the top of the tower into the PLC system through the temperature sensor, and the system compares this temperature value with the temperature value you set, and obtains a deviation value, which is the value of 0-100 for the deviation PID operation, which is usually called the PO value, that is, the valve opening of the medium that needs to be adjusted, which is often displayed on the system screen, and the PO value is often converted by the AO module, and the value of 0-100 is converted into 4-20mA output to adjust the control valve. Usually the PO value is related to the size of the deviation value of the top temperature of the tower and the PID calculation, not a fixed value, the larger the deviation, the greater the valve opening (reaction adjustment).

Analog output control valve The output of 0-10V corresponds to the closing and maximum opening of the valve.

Then you're going to have to use a proportional valve. There is also an analog output.

Well, you're a bit of a big project. Theoretically, it's not impossible, it's just a bit troublesome, and the estimated effect is not ideal. First of all, the PLC must communicate with a computer with Internet access and can control the actions of the PLC on the computer, and secondly, establish remote assistance between the two remote computers (for example, QQ can do ......).Then, the manipulated computer gets the control of the controlled computer, and finally, you can basically achieve the effect you want.

Look at what kind of valve it is! The normal is to directly control the solenoid valve!

If it's a proportional valve, you need an analog module! A proportional amplification board is required, as well as an analog module.

OK! You can also use the mobile network!

Solenoid valve coil voltage is appropriate.

Just do it.

To realize PLC remote control and PLC program remote control, only one HINET intelligent gateway is required.

You say that Chongqing's Internet and Shanghai's network have a large latency, what should you do if the PLC malfunctions?

J61H-250, DN20 is the valve code.

Wherein: the first unit J - globe valve;

The second unit is omitted, indicating that the valve is a manual valve;

The third unit is the connection mode, and 6 represents welding;

The fourth unit is the valve structure type, 1 means the straight-through type;

The fifth unit is the sealing surface, and h indicates that the sealing surface is stainless steel;

The sixth unit is the nominal pressure of the valve, which has a nominal pressure of 250 bar, or 25 MPa;

The seventh unit is the valve body material, which is omitted in this unit, which means that the valve body material of the valve is carbon steel.

DN20 refers to the valve specification, which is the nominal diameter DN20.

J61H-250, the full name of DN20:

DN20 welded steel straight-through globe valve.

Commonly used labeling methods for domestic valves:

J: Globe valve.

The vacancy here is indicated as manual.

6: Welded connection.

1: The structure of the valve is straight-through type.

H: The sealing surface is CR13 stainless steel.

250: Indicates that the valve design pressure is 250 bar

DN20: means that the valve diameter is 20mm

If the valve plays the role of opening and closing, then the diameter of the valve should be the same diameter as the pipeline, which is a big waste and a small increase in resistance.

If the function of the valve is to adjust, the diameter will be different from the diameter of the pipe, which is not a matter of reducing the cost, but a calculation result, and this calculation result is related to the flow rate, pressure drop and valve resistance curve.

For example, the regulating valve will generally be one size smaller than the pipe diameter, and the pressure reducing valve will also be one to two smaller than the pipe diameter.

The pipe you choose is an outer diameter of 60·· D60 pipes with DN50 valves, for example, D89 pipes with DN80 You don't understand the concept of OD and NOM diameter.

The valves on the pipe should be the same size, which can save costs and reduce head loss.

You mean the welding form, the size of the valve can be changed according to the size of the pipe!