What is the reason why the pneumatic valve is not closed tightly, and what is the reason why the pne

Fault 1: Pneumatic device failure.

1. Insufficient air pressure to perform.

2. The seal of the pneumatic device is damaged, and the air leakage and low pressure lead to insufficient stroke and cannot be completely opened and closed.

Fault 2: Valve failure.

1. The valve core is not closed tightly due to foreign body blockage or valve core damage. Clean or replace the spool. It is also recommended to install a filter at the valve inlet.

2. The connection between the valve and the pneumatic actuator is loose, and it is adjusted and fixed in time.

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.

Failure of pneumatic actuators (cylinders).

Due to improper assembly and long-term use of the cylinder, the pneumatic actuator (cylinder) is prone to internal and external leakage, insufficient output force and unstable action, poor buffering effect, damage to the piston rod and cylinder head and other fault phenomena.

1) The internal and external leakage of the cylinder is generally caused by the eccentricity of the piston rod installation, the lack of lubricating oil, the wear or damage of the sealing ring and the sealing ring, the impurities in the cylinder and the scars of the piston rod. Therefore, when there is internal and external leakage in the cylinder, the center of the piston rod should be readjusted to ensure the coaxiality of the piston rod and the cylinder barrel; Always check whether the lubricator works reliably to ensure that the actuator is well lubricated; When the sealing ring and sealing ring are worn or damaged, they must be replaced in time; If there are impurities in the cylinder, they should be removed in time; If there is a wound on the piston rod, it should be replaced.

2) The output force of the cylinder is insufficient and the action is not stable, which is generally caused by the piston or piston rod being stuck, poor lubrication, insufficient air supply, or condensate and impurities in the cylinder. For this, the center of the piston rod should be adjusted; Check whether the lubricator works reliably; Whether the air supply line is blocked. When there is condensate and impurities in the cylinder, it should be removed in time.

3) The poor cushioning effect of the cylinder is generally caused by the wear of the buffer sealing ring or the damage of the adjusting screw. At this point, the sealing ring and adjusting screw should be replaced.

4) The piston rod and cylinder head of the cylinder are damaged, which is generally caused by the eccentricity of the piston rod installation or the failure of the buffer mechanism. In this regard, the center position of the piston rod should be adjusted; Replace the buffer seals or adjustment screws.

Causes.

The compressed air pressure is insufficient.

The inner sealing face of the valve is locked.

The medium in the valve cavity jams the opening and closing parts, preventing them from rotating.

Solution. Increase the source gas supply and source pressure.

Check the valve for rust in the opening and closing parts, or problems with other fittings that fit with it.

Clean the valve cavity with foreign matter.

The question is very professional. Specific problems must be analyzed on a case-by-case basis.

It is possible that the valve is stuck, locked, causing excessive torque, and the output torque of the pneumatic actuator is not enough to open the valve.

The actuator torque was not reached.

The valve cannot be opened.

Pneumatic head causes.

Generally buy better quality products, at that time from Shanghai Guardian Valve to buy, because the quality of this product is assured...

Summary. We'll be happy to answer this question for you.

There are many reasons why the pneumatic butterfly valve is not closed tightly, and it can be adjusted according to the specific situation, such as impurities on the sealing surface of the valve, the valve can be adjusted and then closed, and repeated operation can be eliminated; Secondly, it may be that the stem thread is rusty, it is recommended to adjust the valve switch more, or it is not possible, only to overhaul or replace the sealing surface; Finally, adjust the opening and closing flexibility of the valve, and it is best to add lubricating oil in an appropriate amount. Hope it helps.

Hello, I have seen your question and am sorting out the answer, please wait a while and I'm glad to answer this question for you. There are many reasons why the pneumatic butterfly valve is not closed tightly, and it can be adjusted according to the specific situation, such as impurities on the sealing surface of the valve, the valve can be adjusted and then closed, and repeated operation can be eliminated; Secondly, it may be that the stem thread is rusty, it is recommended to adjust the valve switch more, or it is not possible, only to overhaul or replace the sealing surface; Finally, adjust the opening and closing flexibility of the valve, and it is best to add lubricating oil in an appropriate amount. Hope it helps.

Summary. 1.Piston seal failure:

Piston seal failure is the most common cause of air leakage, piston seal will wear out for a certain period of time, and when worn to a certain extent, air leakage will occur. 2.Damaged valve body:

If the valve body itself is damaged, or if there is a crack, it can cause air to seep out of the gap in the piston ring. 3.Stem damage:

Damaged valve stem can also lead to air leakage, usually due to a crack in the valve stem or a damaged seal ring on the valve stem. 4.Piston ring damage:

Piston rings are often damaged, and if there is a crack in the piston ring, then air will seep out of the gap in the piston ring.

This is most likely due to oxidation of the tube at the interface.

Or not tightened.

The zero setting of the actuator is not accurate, and the full closing position of the valve is not reached. Adjust the method of answering the slow decay: 1) manually close the valve (must confirm that it has been completely closed); 2) Manually close the valve by re-clearing the leak, and the valve shall not be screwed with a little force; 3) Twist back (valve opening direction) half a turn; 4) Then adjust the limit.

1.Piston seal failure spring collapse: piston seal failure grinding beam is the most common cause of air leakage, piston seal will wear out in a certain period of time, when the wear to a certain extent, there will be air leakage.

2.Body damage: If the valve body itself is damaged, or if there is a crack, it can cause air to seep out of the gaps in the piston rings.

3.Stem damage: Stem damage can also lead to air leakage, usually caused by cracks in the stem or damage to the sealing ring of the stem.

4.Piston Ring Damage: Piston rings are often damaged, and if there is a crack in the piston ring, then air will seep out of the gap in the piston ring.

Summary. 1. The air source pressure is insufficient, and the solution is to increase the air source pressure and set up a gas storage tank on the way to reduce the pressure change. 2. If the flow rate is not enough or there are other devices with large air consumption working at the same time, the solution is to add an air compressor and an air storage tank to reduce the pressure change.

3. The torque of the pneumatic actuator of the pneumatic ball valve is small, and the solution is to increase the specification of the pneumatic actuator. 4. The load of the pneumatic ball valve is too large, and the assembly of the pneumatic ball valve spool or other valve parts is too tight. The solution is to reconfigure and adjust the torque of the pneumatic ball valve.

5. The friction of the pneumatic ball valve cylinder changes too much, and the solution is to carry out appropriate lubrication.

1. The air source pressure is insufficient, and the solution is to increase the air source pressure, and set up a circle and embed a gas storage tank on the way to reduce the pressure change. 2. If the flow rate is not enough or there are other devices with large air consumption working at the same time, the solution is to add an air compressor and an air storage tank to reduce the pressure change. 3. The torque of the pneumatic actuator of the pneumatic ball valve is small, and the solution is to increase the specification of the pneumatic actuator.

4. The load of the pneumatic ball valve is too large, and the assembly of the valve core or other valve parts of the pneumatic orange ball valve is tight. The solution is to reconfigure and adjust the torque of the pneumatic ball valve. 5. The friction of the pneumatic ball valve cylinder changes too much, and the solution is to carry out suitable lubrication.

Dear, I hope the above methods can help you <>

First of all, let's analyze what are the reasons why the pneumatic control valve + pneumatic valve cannot be closed?

Valves have a certain amount of leakage, depending on whether the leakage of the valve exceeds the standard specified value, more than the quality problem.

Secondly, whether the output of the electrical converter matches the valve diaphragm pressure.

Whether the valve is stuck with debris. + Whether the spring force of the valve is appropriate.

Whether the stem is jammed or not. + Serious wear of the valve core and valve seat + air leakage of the diaphragm of the membrane head.

Locator failure. + Air opening valve, zero point spring preload is too large.

The stem is adjusted too short.

The pressure difference between the front and rear of the control valve is too large, and there is a problem with the selection.

Whether the output force of the actuator is too small, the effective output pressure can be adjusted (+pf to increase the output force, for the air-closed valve, the adjustment part is left-handed (loosened), that is, the PO PL is moved forward, but attention should be paid to whether the full stroke is changed.

We can first find out the cause from the above description and then implement a solution.

Pneumatic control valves: Several solutions for pneumatic valves that cannot be closed.

If your pneumatic valve has a manual operation, then stop every time and let the hand shake to death, or let the instrument personnel re-adjust the zero point and positioner;

The stroke of the closing position is not in place, the valve stem is seriously worn, and the pressure of the compressed air is up to standard, for many reasons.

Whether the valve is air-open or air-closed. If it is an air-closed valve, you can see whether the pressure of the air source, the adjustment of the zero range of the positioner is normal, and whether the valve core is stuck or not.

If it is a gas open valve, the air source is disconnected, and the valve should be closed, if it is not closed, it may be a problem of whether there is a foreign object stuck in the valve body;

If the valve is randomly closed, it is recommended to check whether the wind pressure of the instrument is sufficient, that is, whether the wind pressure output by the positioner can reach the pressure when the regulating valve is closed; + See if the pressure of the air source is enough, and then see if the valve is stuck, or if it is leaking, this is also not dead. Try to adjust the locator first;

Air opening valve: 1. The preload of the spring is not enough, so it can be appropriately increased.

2. When the working conditions allow, the valve should be removed for a pressure test, so that the sealing of the valve core and valve seat can be checked, and whether the valve core and valve seat are damaged.

3. If the situation of closing does not die again, you can cut out the valve and check whether there is any foreign object at the valve core seat.

4. Check whether the zero point of the valve is too high.

Air shut-off valve: 1. The preload of the spring is too large, and the preload can be appropriately reduced.

2. When the working conditions allow, the valve should be removed for a pressure test, so that the sealing of the valve core and valve seat can be checked, and whether the valve core and valve seat are damaged.

3. If the situation of closing does not die again, you can cut out the valve and check whether there is any foreign object at the valve core seat.

4. Check whether the air pressure of the valve is normal.

5. Check whether the diaphragm is.

How to solve the optimization problem if the motor valve is not opened in place? So first, this situation is relatively easy to solve, as long as you get to Naxi Five.

1. Insufficient air pressure; 2. The range of the electrical positioner is not adjusted enough; 3. The medium is too dirty and adheres to the inner wall of the valve.

The pneumatic valve is stuck and not in place, and you can find a professional person to overhaul it, so as to achieve a better solution and effect.

It is recommended that you refer to the relevant manuals, under normal circumstances, you can find the corresponding solution, and you can solve it.

It is recommended to take a look at the manual, or you can find a professional manufacturer to repair it.

How to solve the problem that the pneumatic valve is stuck and not opened in place, you go to the top to add a little lubricating oil to see, and then open it, does it feel good?