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  • Common Valve for Natural Gas Pipeline - Balanced Oil Seal Plug Valve
    Common Valve for Natural Gas Pipeline - Balanced Oil Seal Plug Valve Oct 26, 2022
    The pipe plug valve is a shut-off valve used for long-distance natural gas pipeline and station control system, which is a special valve to meet the special requirements of natural gas pipeline. The valve is required to have special technical performance such as adaptability to harsh environment, service life of more than 30 years, two-way zero leakage, fire resistance and anti-static, acid medium corrosion resistance, and labor saving operation. The pipeline plug valve has the following characteristics compared with the traditional bushing plug valve: ① It has reliable sealing, long service life and is sealed by the cone surface. The sealing contact surface is large, and the oil film plays the role of lubrication and sealing. ② The valve torque is small and the operation is labor-saving. The plug cone is installed upside down. ③ The valve cover at the bottom of the valve body is equipped with an adjusting support, which can adjust the position of the valve core. Under high temperature working conditions, the thermal expansion of the plug can avoid the sealing pair from being wedged by its lifting. ④ The design of valve stem anti fly out, O-ring and graphite packing, and triple valve stem seal filled with sealing grease meet the leakage requirements. It can work reliably for a long time without fastening and maintenance, and has fire protection function.
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  • Performance Characteristics and Application of Plug Valve
    Performance Characteristics and Application of Plug Valve Oct 10, 2022
    The plug valve is a quick opening and closing straight through valve. Because the movement between sealing surfaces has a wiping effect, the sealing surface can completely prevent contact with the flowing medium when it is fully opened, so it can usually be used for media with suspended particles. Plug valves are also widely used in industry. Performance Characteristics of Plug Valve: 1. Excellent high and low temperature performance, good pressure resistance. 2. Excellent sealing performance. 3. The material has strong adaptability and wide temperature range. The applicable temperature range of the material is - 40~+200 ℃. Application of Plug Valve: 1. Plug valves are widely used in oilfield exploitation, transportation and refining equipment, petrochemical industry, gas, natural gas, liquefied petroleum gas, HVAC industry and general industry. 2. The plug valve is also suitable for conveying liquids containing suspended solids and particles. The straight through plug valve can transport materials containing crystals with thermal insulation measures. The application scope of the plug valve is becoming wider and wider, and the oil seal plug valve with forced lubrication has also appeared, which has better sealing performance, saves effort in opening and closing, and prevents the sealing surface from being damaged.
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  • Difference Between Ball Valve and Traditional Valve
    Difference Between Ball Valve and Traditional Valve Sep 01, 2022
    Valves are widely used and have many kinds. Ball valve is one of the most important valve products. Next, Dervos will introduce the difference between ball valve and traditional valve! Comparison between ball valve and traditional valve: 1. From the perspective of energy conservation and environmental protection, the ball valve is an energy-saving product. It has good circulation capacity and small flow resistance, which is very important in engineering application. 2. The ball valve has the advantages of small fluid resistance, quick and convenient opening and closing, small external size, light weight, good sealing, long service life, high safety and reliability, and convenient maintenance. Moreover, it is welcomed for its characteristics of self pressure relief and ball cleaning. 3. The opening and closing stem of the ball valve performs rotary motion. Compared with the linear motion valve, it is convenient to open and close and easy to realize the automation of valve operation. 4. It can be used for various media, pressure and temperature conditions, and the valve diameter range is also expanding. In recent years, with the breakthroughs in new structure, new materials and processing technology, ball valves are used more and more widely, and the market share increases year by year. It is one of the fastest developing valve varieties.
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  • Suggestions on Installation and Maintenance of Lift Check Valve
    Suggestions on Installation and Maintenance of Lift Check Valve Aug 24, 2022
    Lift check valve refers to a valve that automatically opens and closes the valve disc depending on the flow of the medium itself to prevent the medium from flowing backward. The function of the check valve is to only allow the medium to flow in one direction and prevent the reverse flow. Installation and Maintenance of Lift Check Valve 1. Both ends of the passage of the lift check valve must be blocked and stored in a dry and ventilated room. If it needs to be stored for a long time, please check whether there is rust and corrosion every day. 2. Before installation, the valve should be cleaned and the defects caused during transportation should be eliminated. 3. Before installation, please carefully check whether the marks and nameplates on the valve meet the use requirements. 4. The lift check valve shown in above picture can only be installed on the horizontal pipeline. 5. When installing the check valve, pay attention to the flow direction of the medium. The flow direction of medium should be consistent with the arrow direction indicated on the valve body.
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  • Advantages of Soft Seal Gate Valve in Application
    Advantages of Soft Seal Gate Valve in Application Aug 16, 2022
    Under the condition that the valve body, bonnet and all parts of the existing gate valve are in good condition, the valve cannot be used only if the sealing surface is slightly deformed or corroded, resulting in great waste. Therefore, the customer hopes that the valve seat and the sealing surface of the valve plate are not easy to deform, corrosion resistant, and the vulnerable sealing materials can be replaced. The valve plate and the sealing surface should not have friction or minimize friction during opening and closing. Dervos soft seal gate valve can meet the needs of customers. Advantages of Soft Seal Gate Valve in Application: 1. Low flow resistance. The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small. 2. Compared with the globe valve, opening and closing is labor-saving. Whether it is open or closed, the movement direction of the wedge is perpendicular to the medium flow direction. 3. The closing time is long and the water hammer phenomenon is not easy to occur. 4. The medium can flow in any direction on both sides, which is easy to install. 5. The structure length (i.e., the distance between the two connecting end faces of the shell) is small. 6. Simple shape, short structure length, good manufacturing process and wide application range. 7. Compact structure, smooth channel and long service life. 8. PTFE packing is used for reliable sealing. The operation is light and flexible.
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  • Characteristics of High Performance Triple Eccentric Two-way Hard Sealing Butterfly Valve
    Characteristics of High Performance Triple Eccentric Two-way Hard Sealing Butterfly Valve Aug 03, 2022
    At present, as a component used to realize the on-off and flow control of pipeline system, butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. However, due to the limitation of its structural characteristics, it is not suitable for high temperature resistance, high pressure resistance, corrosion resistance, wear resistance and other industries. There is a more advanced butterfly valve, namely the high performance triple eccentric two-way hard sealing butterfly valve. Compared with the traditional butterfly valve, it has the advantages of high temperature resistance, light operation, frictionless opening and closing, high sealing performance and long service life. Characteristics of High Performance Triple Eccentric Two-way Hard Sealing Butterfly Valve: 1. The valve seat seal ring is composed of multiple layers of stainless steel sheets on both sides of the soft T-shaped seal ring, which has the dual advantages of metal hard seal and soft seal, and has zero leakage sealing performance at low and high temperatures. 2. The sealing surface of the valve plate and the valve seat is an inclined cone structure, and the surface of the inclined cone of the valve plate is overlaid with heat-resistant and corrosion-resistant alloy materials. 3. The spring fixed between the pressing plates of the adjusting ring is assembled with the adjusting bolt on the pressing plate. This structure effectively compensates the elastic deformation of the valve stem under medium pressure caused by the tolerance between the shaft sleeve and the valve body.
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