What are the common problems with pneumatic butterfly valves? Before understanding this issue, I would like to tell everyone that instead of resolving the problem when the pneumatic butterfly valve fails, it is better to do a full job during the installation and use. Some failures can be avoided completely.
First, the pneumatic butterfly valve must be strictly examined and tested before leaving the factory. When testing the sealing performance of a pneumatic butterfly valve, the two sides of the inlet and outlet are evenly fixed, and then the butterfly valve is closed and the inlet end of the valve is pressed. End observation is not a leak. If you want to do a strength test on the valve on the pipe, the butterfly plate of the pneumatic butterfly valve should be in the open state to prevent the pressure from destroying the valve sealing pair.
In addition, after the pneumatic butterfly valve is shipped from the factory, it is necessary to pay attention to it during transportation, and it is not possible to bump the valve. Before the installation, check all the components of the pneumatic butterfly valve. Confirm whether the valve performance and parameters purchased are in accordance with the working conditions of the circulating medium of the pipeline. If it is found to be inconsistent, it must be replaced with the manufacturer in a timely manner. It is worth noting that when purchasing the valve product, it must be their own needs and work. Say it clearly so as not to cause unnecessary trouble.
Finally, we must pay attention to the cleaning and maintenance of pneumatic butterfly valves. Before the installation, ensure that the inner cavity of the valve is clean, including the magazine and foreign objects on the seal ring and the butterfly plate. Before cleaning, the butterfly plate must not be closed to prevent impurities from damaging the seal ring and affecting the sealing performance of the valve. The only requirement for the position of the pneumatic butterfly valve in the pipeline is that it cannot be flipped in the horizontal pipeline to prevent leakage of the medium from the stem packing, causing danger. For pneumatic butterfly valves with frequent opening and closing, maintenance and maintenance should be done every two to three months on average to lubricate the various parts of the valve. Pneumatic wafer butterfly valve is recommended to use butterfly valve flange when installed in the pipeline.
The attention of pneumatic butterfly valve installation has been introduced. If you want the pneumatic butterfly valve not to fail in the process of use, we need to check the use effect of the valve regularly and find out the failure in time.
Pneumatic butterfly valve installation has been introduced attention to the finished, if you want to use pneumatic butterfly valve in the process of failure, we need to regularly check the valve to use the effect and found that the failure to rule out.
The common faults of pneumatic butterfly valves are:
1. Pneumatic butterfly valve has gas source, signal, no output.
2. Constant orifice blockage Torque motor short circuit.
3. The valve position exceeds or lags after a given signal.
4. Air leakage in the amplifier.
5. Steady movement of the stem after the signal is given The amplifier does not match the charge and exhaust.
- Published in PRODUCTS NEWS
Introduction of manual butterfly valve
Butterfly valve is a common type of valve,its function is to install on the pipeline and cut off and throttle the circulating medium in the pipeline.
In the common valve types, the structural length and overall height of the butterfly valve are relatively small, the opening and closing is very rapid, and which has good fluid control characteristics. These structural characteristics of the butterfly valve make it the most suitable among many valve types.
Manual butterfly valves are used most in all types of butterfly valves, not only because of their simple structure and light weight, but also because of the good sealing performance of manual butterfly valves. The manual butterfly valve not only can be used to circulate the medium in the cut-off pipeline, but also regulate the flow of the medium in the pipeline.What are the common types of manual butterfly valves? This article will give you an introduction based on the manual butterfly valve.
The manual butterfly valve can be divided into two kinds: handle butterfly valve and worm gear operated butterfly valve, and there are differences between the wafer type butterfly valve and the flange type butterfly valve according to the connecting mode.Commonly used models of Manual butterfly valve, we can be divided into a pair of wafer manual butterfly valve and flanged manual butterfly valve to introduce.
From the point of structure characteristics, manual butterfly valve is used in middle type and short structure steel plate welding, a new type of structure is more compact, small weight, simple installation, and small flow resistance, flow is larger.In addition, there are no connecting rods and bolts inside the manual butterfly valve, which can be used more safely and reliably, and the service life can be extended.The manual butterfly valve is usually a two-way seal. If there is no special requirement, the installation on the pipeline is not affected by the flow of the medium.
Manual butterfly valve, especially handle butterfly valve, has limited operating torque, so it is not suitable for large diameter valve.Normally the diameter of the handle butterfly valve is 250mm, which requires the installation of turbo head or electric and pneumatic device according to the situation.Manual butterfly valves in water supply and drainage, electric power, chemical, petroleum, water conservancy, municipal construction and other fields have a wide range of applications, if you have a need to purchase, please contact with professional butterfly valve manufacturer – Bkvalve.
To figure out the difference between wafer butterfly valve and flanged butterfly valve,we should look at the features of wafer butterfly valve and flanged butterfly valve.The big difference is that flanged butterfly valve with two more flanges,the wafer butterfly valve has two less flanges,and of course the price is cheaper, the price is about 2/3 of the flange.The flanged butterfly valve is more reliable than the connecting butterfly valve.It is not as convenient as the flanged butterfly valve when installing the butterfly valve, because it is necessary to add flange pieces, and it is easy to leak.
From the specific working conditions, when the imported valves are selected, the wafer type butterfly valve is used as much as possible. It is light and easy to replace. However, the length of the bolt of wafer butterfly valve is longer, and the construction accuracy is higher. If the flange between two sides is not right, the bolt will be subjected to great pressure, and the valve will leak easily.
There is no flange at both ends of the wafer butterfly valve body, only a few guiding bolt holes, and the valve is connected with a set of bolts / nuts with the flanges at both ends.Under high temperature conditions, the bolt expansion of the wafer butterfly valve may cause leakage, so it is not suitable for large pipe diameter under high temperature condition.
Moreover, the wafer butterfly valve can not be used for the downstream and downstream parts of the pipeline, because when the downstream flange is removed, the wafer valve will fall, so we must make joint in other parts to disassemble.
Compared with flanged butterfly valve, wafer butterly valve is more convenient to disassemble, the valve cost is lower, but the disadvantage is that a sealing surface issue, both sealing surface have to be opened.Flanged butterfly valve body has flanges on both ends, connected to pipe flange.The seal is relatively more reliable.The flanged butterfly valve does not have the above problem, but also has to pay higher cost.
- Published in PRODUCTS NEWS