Why can t the electric butterfly valve with a diameter of 1.4 meters open when the flow rate is larg

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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.

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It should be that the torque of the electric is not enough.

The pressure difference between the two sides is large, the butterfly plate is stressed, and the pressure on both sides is balanced, and other valves can be opened first.

Electric butterfly valve fault and troubleshooting method.

1. Before the installation of the electric butterfly valve, confirm whether the performance of the senmi product and the direction of the medium flow arrow are consistent with the moving conditions, and clean the inner cavity of the valve, and do not allow impurities and foreign substances attached to the sealing ring and butterfly plate, and never close the butterfly plate before cleaning, so as not to damage the sealing ring.

2. It is recommended to use the special flange for disc valve for the installation of electric butterfly valve, that is, the HGJ54-91 socket welded steel flange.

3. The position of the electric butterfly valve installed in the pipeline, the best position is vertical installation, but it cannot be reversed.

4. The flow rate needs to be adjusted during the use of the electric butterfly valve, and there is a pneumatic actuator to control it.

5. For manual butterfly valves that are opened and closed more times, open the worm gear box cover in about two months to check whether the butter is normal, and an appropriate amount of butter should be maintained.

6. Check the compression of each connecting part, which not only ensures the tightness of the packing, but also ensures the flexible rotation of the valve stem.

7. The metal sealed electric butterfly valve is not suitable for installation at the end of the pipeline, if it must be installed at the end of the pipeline, it is necessary to install the outlet flange to prevent the backlog of the sealing ring and overposition.

8. The valve stem installation and use reaction regularly check the valve use effect, and eliminate the fault in time.

Troubleshooting of electric butterfly valve seal surface leakage.

1. There are sundries between the butterfly plate and the sealing surface.

2. The closing position of the butterfly plate and the sealing surface is not correct.

3. The flange bolts on the outlet side are unevenly stressed.

Troubleshooting of leakage at both ends of the electric butterfly valve.

1. The sealing gaskets on both sides fail.

2. The tightness of the pipe flange is uneven or not compressed.

3. The upper and lower sealing gaskets of the sealing ring fail.

The faults of the electric butterfly valve are: the valve can not be reversed or the reversing action is slow, gas leakage, and the electromagnetic pilot valve is faulty.

1) The electric butterfly valve cannot be reversed or the reversing action is slow, which is generally caused by poor lubrication, the spring is stuck or damaged, and the oil or impurities are stuck in the sliding part. In this regard, you should first check whether the lubricator is working normally; Whether the viscosity of the lubricating oil is appropriate. If necessary, the lubricating oil should be replaced, the sliding part of the electric butterfly valve should be cleaned, or the spring and electric butterfly valve should be replaced.

2) After long-term use, the electric butterfly valve is prone to wear of the valve core sealing ring and damage to the valve stem and valve seat, resulting in gas leakage in the valve, slow action of the valve or abnormal reversing and other failures. At this point, the seal, stem and seat should be replaced, or the electric butterfly valve should be replaced.

3) If the inlet and exhaust holes of the solenoid pilot valve are blocked by sludge and other debris, the closure is not tight, the movable core is stuck, and the circuit is faulty, etc., it can lead to the abnormal reversal of the electric butterfly valve.

For the first three cases, the sludge and impurities on the pilot valve and the movable core should be cleaned. Circuit faults are generally divided into two categories: control circuit faults and electromagnetic coil faults. Before checking the circuit fault, the manual knob of the electric butterfly valve should be turned a few times to see whether the electric butterfly valve can be reversed normally under the rated air pressure, if it can be reversed normally, it is a fault in the circuit.

When checking, the voltage of the electromagnetic coil can be measured by the instrument to see if the rated voltage is reached, and if the voltage is too low, the power supply in the control circuit and the associated travel switch circuit should be further checked.

If the electric butterfly valve cannot be reversed normally at the rated voltage, the joint (plug) of the solenoid coil should be checked for looseness or improper contact. The method is to unplug the plug and measure the resistance of the coil, if the resistance is too large or too small, it means that the solenoid coil is damaged and should be replaced.

The most common problem with valves is generally a variety of leaks caused by poor sealing, and the same is true for electric butterfly valves.

The common problems in the use of electric butterfly valves are: improper parameter selection of the electric device, resulting in too large or too small output torque, causing the damage of the weak structure or the burning of the motor of the electric device; The technical communication between the electric power design institute, the complete set of units and the manufacturer is insufficient, which makes the design of the design institute's electronic control system of the electric butterfly valve inconsistent with the actual electronic control system of the product, resulting in the product being unusable; The feedback signal is not consistent with the actual position of the valve, the self-feeding performance of the valve is poor, and the control accuracy is low. There are many reasons for the above problems of electric butterfly valves, which involve the selection of products, the combination of valves and electric devices, and the manufacturing of products.

In order to avoid the occurrence of the above problems, users must pay attention to the selection, and at the same time, the technical standards after the complete set of electric valves must be formulated.

The centrifugal pump uses the rotation of the impeller to make the water centrifugal move to work. Before the pump is started, the pump casing and suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and the water to do high-speed rotation motion, and the water undergoes centrifugal motion, which is thrown to the outer edge of the impeller, and the mold is not flowing into the pressurized water pipeline of the pump through the flow channel of the snail pump casing.

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According to the flow rate of 3ms, it is normal to about 8000 cubic meters per hour.

It is usually calculated according to the flow rate of the water in the pipe. Generally 1700 17000 cubic meters an hour is normal.

If the flow rate of water is 1 meter per second, the flow rate is cubic meters.

The calculation method is that the area of the water flow section multiplied by the flow velocity multiplied by the time equals the flow rate, all in SI units.

You're not perfect.

The first is whether there is an open stream or a full stream, and what the head is.

You're so studious.........

Yes, if you don't use the bypass you said before.

Now, the butterfly valve is definitely a good choice. This is because the "opening-flow" curve of a butterfly valve is essentially linear in the flow range of 25%-75%. That is to say, if the opening is 40%, the flow rate is about 40%.

It's okay to turn on the full power after power-on, but under normal conditions (according to your meaning, it should be a power-off state) it is also hoped that a small part of the fluid can pass through this butterfly valve, not by the valve itself, but by the driving mechanism of the valve

1] If it is a motorized head, an quarter-travel switch can be installed.

When the valve is about to be closed, the switch will be electrically turned off, then the valve will not be closed, of course, the angle at this time is not 15 degrees, the above is 25%-75%, 15% is not ** range, how many degrees to be determined by experiments.

2] If it is an electro-pneumatic (or hydraulic) head, you can use a mechanical stopper, that is, to make an obstacle on the valve stem (put between the stem and the control head, do not put it inside the valve), when the valve stem is about to be completely closed, it is prevented from continuing to close, and the valve will not be closed.

If the pressure gauge is installed between the pump outlet and the valve, adjust the valve to open up or when the valve is open, the pressure at the outlet will also become larger or smaller, and the vacuum gauge at the inlet will not change much.

Inlet, a Bernoulli equation, gives inlet pressure = 10m (atmospheric pressure) + 1m-v 2 2g - loss. As the flow rate increases, the v, loss increases, the inlet pressure decreases, and the vacuum increases.

The larger the q, the smaller the head, and the smaller the outlet pressure.

The relationship between the relative flow rate q qmax and the relative opening l lmax of the control valve: q qmax = f (l lmax).

The relationship between the relative flow rate q qmax of the regulating valve and the relative opening l lmax and the pressure difference on the valve: q qmax = f (l lmax) (dp1 dp) 1 2).

The inherent flow characteristics of the control valve itself depend on the shape of the spool, the simplest of which is the linear flow characteristicThe relative flow rate of the control valve is in a linear relationship with the relative opening, that is, the flow change caused by the change of a single stroke is a constant.

There is no definite formula for calculating the relationship between valve opening and flow rate and pressure. Their relationship can only be expressed as a general function, and the specific test curve should be checked.

Different flow characteristics will have different valve openings, and the quick-opening flow characteristics will vary greatly at first, and then be relatively gentle. The linear flow characteristics are that the opening of the valve is proportional to the flow rate, that is to say, the valve opening reaches 50%, and the flow rate of the valve also reaches 50%.

I only know the formula for the flow capacity:

Flow coefficient = flow rate x open root number (specific gravity pressure difference).

As for the valve opening, the different openings of various valves should correspond to different pressure drop flow curves. I don't think there's a formula to follow.

Different flow characteristics will have different valve openings, and the quick-opening flow characteristics will vary greatly at first, and then be relatively gentle. The linear flow characteristic is that the opening of the valve is proportional to the flow rate, that is, the valve opening reaches 50%, and the flow rate of the valve also reaches 50%; The equal 100 flow characteristics, contrary to the quick opening type, are small changes at the beginning and larger later. Think about the graph for yourself.