Case
Case
Valves can regulate the flow of fluids in pipelines to ensure that sewage can flow according to design requirements during treatment.
Valves can divert fluids to different pipelines or combine fluids from different pipelines to achieve treatment and control of different parts of sewage.
Valves can isolate different sections of a pipeline to allow for maintenance, repair, or equipment replacement, while also shutting off fluid flow for emergency treatment or to prevent leaks.
Valves regulate the pressure in the pipes to ensure that the proper pressure is maintained during the treatment process.
The valve can prevent the backflow of sewage during the treatment process and ensure the normal operation of the treatment system.
In general, valves play an important role in sewage treatment and can effectively control and manage the flow of sewage to ensure the normal operation of the treatment system.
According to the classification of valves, they can be divided into gate valves, globe valves, throttle valves, check valves, etc.
According to the classification of valves, they can be divided into gate valves, globe valves, throttle valves, check valves, etc.
According to the structural characteristics of the gate, it can be divided into wedge type and parallel type.
The sealing surface of the wedge gate valve is at an angle to the vertical center, and most of them are made of a single gate; the sealing surface of the parallel gate valve is parallel to the vertical center, and most of them are made of double gates.
The sealing performance of the gate valve is better than that of the globe valve, and the fluid resistance is small. It has certain adjustment performance. The rising stem type can adjust the degree of sealing according to the height of the valve stem.
The disadvantage is that the structure is more complex than the stop valve, the sealing surface is easy to wear and difficult to repair. Gate valves are suitable for large-diameter valves. In addition to being suitable for steam, oil and other media, they are also suitable for media containing granular solids and high viscosity; and are used as vent valves and low vacuum system valves;
Resilient gate valves are less likely to get stuck after being heated. It is suitable for media such as steam, high-temperature oil, oil and gas, and locations with frequent switches. It is not suitable for media that are prone to coking.
The wedge-type single gate valve has a simpler structure than the elastic gate valve, and its sealing performance at higher temperatures is not as good as that of the elastic or double gate valve. It is suitable for high-temperature media that are prone to coking.
Among wedge gate valves, the double gate type has good sealing performance and is easy to repair after the sealing surface is worn. It has more parts than other types. It is suitable for steam, oil and media with large sealing surface wear losses, or in locations with frequent switching. It is not suitable for media that are prone to coking.
Compared with gate valves, stop valves have good adjustment performance, simple structure, easy manufacturing and maintenance, and are cheap. They are suitable for steam and other media. They are not suitable for media with high viscosity and containing particles that are easy to precipitate. They are also not suitable for use as vent valves and low vacuum systems valve.
The throttle valve has small dimensions, light weight, and better adjustment performance than the disc globe valve and needle valve, but the adjustment accuracy is not high. When the flow rate is large, the sealing surface is easily eroded. It is suitable for media with lower temperature and higher pressure, as well as locations where flow and pressure need to be adjusted. It is not suitable for media with high viscosity and solid particles. It is not suitable to be used as a isolation valve.
Check valves can be divided into lift type and swing type according to their structure.
The lift check valve has better sealing performance than the rotary check valve. The fluid resistance is large and the horizontal type should be installed on the horizontal pipeline:
The vertical type should be installed on vertical pipelines.
The swing check valve should not be made into a small diameter valve. It can be installed on horizontal, vertical or inclined pipelines. If installed on vertical pipelines, the medium flow direction should be from bottom to top.
Check valves are generally suitable for clean media and are not suitable for media containing solid particles and high viscosity.
The ball valve has a simple structure, rapid opening and closing, easy operation, small size, light weight, few parts, and small fluid resistance. The structure is simpler than the gate valve and globe valve, and the sealing surface is easier to process and less likely to be scratched than the plug valve. It is suitable for low temperature, high pressure and high viscosity media, and cannot be used to adjust the flow rate.
The plug valve has a simple structure, quick opening and closing, easy operation, small fluid resistance, few parts, and light weight. It is suitable for media with lower temperature and higher viscosity and parts that require quick opening and closing. It is generally suitable for steam and high-temperature media. medium.
Compared with parallel gate valves of the same nominal pressure level, butterfly valves are small in size, light in weight, and open and close quickly. They have certain adjustment performance and are suitable for making larger diameter valves. They are suitable for temperatures less than 80°C and pressures less than 1.0 MPa crude oil, oil products, water and other media.
The opening and closing part of the valve is a rubber diaphragm, which is sandwiched between the valve body and the valve cover. The middle protruding part of the diaphragm is fixed on the inverted rod, and the valve body is lined with rubber. Since the medium does not enter the inside of the valve cover, there is no need for a stuffing box.
The diaphragm valve has a simple structure, good sealing performance, easy maintenance, and small fluid resistance. It is suitable for oil, water, acidic media and media containing suspended matter with a temperature less than 200°C and a pressure less than 1.0MPa. It is not suitable for organic solvents and strong oxidants. medium.
