Double flange soft seal gate valve is a type of valve commonly used in water supply and drainage, sewage treatment and industrial pipeline systems. It has been widely used and praised for its reliable sealing performance, convenient installation, and low maintenance costs.
This article will introduce in detail the basic definition, material selection, installation, and maintenance precautions of the double flange soft seal gate valve, as well as the advantages and applicable working conditions of the extension stem design.
What is a double flange soft seal gate valve?
The double flange soft seal gate valve has soft material as the sealing member. It adopts a double-flange connection structure, making it easy to install and disassemble. The soft seal design embeds flexible sealing materials, such as rubber or polytetrafluoroethylene (PTFE), between the gate and the valve seat to ensure a good sealing effect when the valve is closed, achieving zero leakage. This type of valve is commonly used in systems that require a high degree of sealing, such as water treatment, power, construction, and petrochemical industries. The double flange design increases the stability of the installation, allowing the valve to operate safely at higher pressures.
Material selection of soft seal gate valve
The valve body and seals of soft seal gate valves are made of various materials. Different materials have their advantages and are suitable for different working conditions.
Valve body material
Cast iron:
Cast iron is one of the most common materials for soft seal gate valves. Due to its low cost and good processing performance, cast iron soft seal gate valves are widely used in water supply and drainage systems. It is suitable for non-corrosive and low-pressure environments but is not suitable for use under high-pressure or high-temperature conditions.
Ductile iron:
Compared with ordinary cast iron, ductile iron has higher strength and toughness and can withstand higher pressure and impact. Ductile iron soft-sealing gate valves are suitable for use in more severe industrial environments, such as high-pressure water conservancy projects, urban water supply pipe networks, etc.
Cast steel:
The soft-sealing gate valve made of cast steel has good high-temperature resistance and high-pressure resistance and is suitable for industrial fields, such as steam pipelines, oil transportation pipelines, etc. Valves made of this material can maintain good performance under more severe temperatures and pressures.
Stainless steel:
Stainless steel has excellent corrosion resistance and is suitable for pipeline systems in chemical, food, pharmaceutical, and other industries that require a high degree of hygiene and anti-corrosion. A stainless steel soft seal gate valve can be used in high-temperature and corrosive media for a long time.
Seal material
Rubber:
Rubber seals have good elasticity and sealing performance, and are suitable for occasions where the temperature is not high and the medium is non-corrosive, such as clean water, air, non-corrosive liquids, etc.
Polytetrafluoroethylene (PTFE):
PTFE seals are resistant to high temperatures and corrosion and are suitable for use in chemical media, corrosive gas or liquid environments. It has a wide operating temperature range and can maintain stable sealing performance under extreme temperatures.
Precautions for installation and maintenance of double flange soft seal gate valve
Installation precautions
Flange alignment and flatness:
When installing a double-flange soft-sealed gate valve, ensure that the flange surface is aligned and flat to avoid leakage or damage caused by uneven stress after the valve is installed. Before installation, the flatness and cleanliness of the flange connection surface should be carefully checked to prevent impurities from damaging the sealing surface.
Bolt tightening sequence:
When tightening flange bolts, alternate diagonal tightening should be used to ensure uniform stress on the flange surface. The tightening torque of the bolts should comply with the valve manufacturer’s recommendations to prevent over-tightening or looseness from affecting the sealing performance.
Pipe Support:
During installation, ensure that the pipe is adequately supported to prevent the valve itself from bearing the weight and stress of the pipe. Especially in horizontal pipelines, proper support can effectively extend the service life of the valve.
Maintenance precautions
Regular inspection:
During the use of the double flange soft seal gate valve, the status of the seals should be checked regularly. Especially in the case of high-frequency opening and closing, the aging and wear of the seals will affect the sealing performance of the valve. If aging or damaged seals are found, they should be replaced in time.
Lubricate the valve stem:
The valve stem is an important part of the gate valve opening and closing, and its lubrication should be checked regularly. For manually operated valves, good lubrication can reduce opening and closing resistance and extend the service life of the valve stem.
Environmental suitability inspection:
According to the installation environment of the valve, regularly check whether corrosion or other environmental factors have adverse effects on the valve, and take protective measures if necessary.
Why is there a DN1000 Extension stem double flange soft seal gate valve?
The extended rod double flange soft seal gate valve is based on the conventional double flange soft seal gate valve and has been improved and designed for specific usage scenarios. Its main feature is to lengthen the valve stem to adapt to buried installation or long operating distance conditions.
Advantages of Extension stem double flange soft seal gate valve
Convenient operation:
The Extension stem design allows operators to directly operate the valve on the ground or from a long distance, avoiding operating difficulties caused by the deep position of the valve or the narrow space. This is particularly important in areas such as municipal water supply systems, underground pipe networks and industrial wastewater treatment.
Reduce corrosion:
The underground or deep well environment is often humid, and ordinary valve stems are easily corroded. The extended stem double flange soft seal gate valve can place the operating parts in a relatively dry environment, effectively reducing the risk of corrosion and extending the service life of the valve.
Suitable for a variety of environments:
The Extension design makes the valve suitable for various special working conditions such as deep wells, underground, and long-distance operations, increasing the scope of application and flexibility of the valve.
Applicable working conditions of Extension stem soft seal gate valve
The Extension stem soft-sealing gate valve is particularly suitable for pipeline systems that are deeply buried, underground, or require a remote operation.
For example:
Municipal water supply and drainage:
In municipal water supply and drainage systems, valves are usually installed in underground pipes. Ordinary operation methods are inconvenient for maintenance and control, but the extension rod design makes operation easier.
Industrial wastewater treatment:
In wastewater treatment systems, pipes are usually buried deep or in inaccessible places. Extended rod soft-sealing gate valves can ensure the normal operation and maintenance of the system.
Agricultural irrigation:
In agricultural irrigation systems, the valve may be installed far away from the operator. The extension rod design can meet the needs of long-distance operation and improve the management efficiency of the irrigation system.
Double flange soft seal gate valves are widely used in many industries due to their good sealing performance, flexible material selection, and simple installation and maintenance methods. Understanding the advantages and applicable working conditions of different materials can help users choose the most appropriate valve type to ensure the efficient operation of the pipeline system.
At the same time, the double-flange soft-sealing gate valve with an Extension stem design provides a convenient solution for underground or remote operation, further broadening the application scope of the soft-sealing gate valve. In practical applications, selecting the appropriate valve type and installation and maintenance methods according to working conditions is the key to ensuring the safe and efficient operation of the system.
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