DN800 pneumatic check valve can t be opened

Take a look at the pneumatic head and see if there is a problem?

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 the user's stove.

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 changing rapidly, and the rankings may vary by time and region. For the latest ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

The diaphragm is damaged, the valve core is stuck, and the air intake is blocked.

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.

Is it not enough pressure, most actuators need an air supply.

Because there is no wind, the check valve disc cannot be opened.

The conditions that cause the slow-closing check valve to not open may be as follows.

First, it may be caused by the pressure of the pipeline is not enough, some slow-closing check valves need pressure drive to open the valve, from kilograms to 2 kg and 10 kg, if the pressure of the water does not reach the minimum pressure of the valve, it will not be opened.

Second, it may be a mistake in operation, the customer must operate the product in accordance with the product manual (operation pilot valve, and ball valve, open and closed), please operate the valve in strict accordance with the manual or consult the engineer to consult the usage.

3. The valve is damaged due to (needs to be tested), and it needs to be returned to the factory for maintenance in time.

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 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...

Crown valve pushing.

Multi-function water pump control valve Model DJ745X When the pump is started, it will open by itself, there should be no one that cannot be opened!

The check valve does not need to be opened manually, look at the manual.

The general solenoid valve is DC, and the mechanical suffocation is eliminated first. Then check whether the coil is in good condition, whether the diode is in good condition, and whether the DC voltage can be sent to the solenoid valve coil.