News Center

10-19

How to extend the service life of the valve packing

WATO Wuhan Weituo Fluid Equipment Control Equipment Co., Ltd The valve is a control component in the fluid delivery system, with the functions of cut-off, regulation, diversion, prevention of backflow, pressure stabilization, diversion or overflow pressure relief. Valves for fluid control systems, from the most simple cut-off valve to a very complex automatic control system used in a variety of valves, its varieties and specifications quite a wide range. In the valve design or use experience, the lift valve packing is mostly asbestos packing or graphite packing or PTFE V packing, but these kinds of packing are limited by the number of valve opening and closing, that is, with the increase of the number of valve opening and closing, the packing will wear and the gap will gradually increase, and the valve will leak from the packing to a certain number of times (according to statistics, no more than 2000 times). After leakage, the packing gland needs to be pressed again. This scheme is suitable for the number of valve opening and closing occasions. If the valve open and close frequently, (such as a year open and close 500000 times), which will undoubtedly increase the use of the valve, maintenance costs. Is there a design that can seal the valve after 100-2 million times? The answer is yes. One way is to add a gasket under the packing and add a spring under the gasket (the preload of the spring needs to be calculated). When the packing is worn, due to the action of the spring, the packing will be re-compressed to make it sealed. At present, this method can only reach 50-1 million times of opening and closing without leakage through use inspection. It requires the user to re-press the packing gland during annual overhaul, which can only reduce normal maintenance. Another way is to use hydraulic and pneumatic sealing technology to change the original valve design idea, use the cylinder seal slip ring at the packing, and increase the O-ring (need to calculate the friction force and seal pressure to determine the number of slip ring and O-ring). This method can be used to open and close 2 million times without leakage, but the O-ring seal is aging, the use time is only 5 years, and the cost is high.

09-13

Understand the installation requirements of the safety valve on the boiler

WATO Wuhan Weituo Fluid Equipment Control Equipment Co., Ltd Safety valve is the opening and closing parts under the action of external force in the normally closed state, when the equipment or the medium pressure within the pipeline increases more than the specified value, by discharging the medium to the outside of the system to prevent the medium pressure within the pipeline or equipment exceeds the specified value of the special valve. Safety valves are automatic valves, mainly used for boilers, pressure vessels and pipelines, control pressure does not exceed the specified value, personal safety and equipment operation plays an important role in protection. Note The safety valve must be pressure tested before it can be used. Safety valve is a special branch of the valve family, its particularity is because it is different from other valves only play the role of switch, more important is to protect the safety of equipment. With the rapid development of China's economic construction, there are more and more equipment projects with pressure control. In view of the need for equipment pressure relief, safety valves play a vital role in the protection of equipment. Safety valve installation should meet the following requirements: 1. Boilers with rated evaporation capacity greater than 0.5 t/h shall be equipped with at least two safety valves; boilers with rated evaporation capacity less than or equal to 0.5 t/h shall be equipped with at least one safety valve. Safety valves must be installed at the outlet of the divisible economizer and the outlet of the steam superheater. 2. The safety valve should be installed vertically in the higher position of the pot dealer and the header. Outlet pipes and valves for taking steam shall not be installed between safety valve and drum or header. 3, lever type safety valve to prevent the hammer to move their own device and limit the lever deviant guide frame, spring type safety valve to have a lifting handle and prevent casually twist the adjustment screw device. 4. For boilers with rated steam pressure less than or equal to 3.82MPa, the safety valve throat diameter should not be less than 25mm; For boilers with rated steam pressure greater than 3.82MPa, the safety valve throat diameter should not be less than 20mm. 5, the safety valve and the boiler connecting pipe, its cross-sectional area should not be less than the inlet cross-sectional area of the safety valve. If several safety valves are jointly installed on a short pipe directly connected to the drum, the passage cross-sectional area of the short pipe shall not be 1.25 times of the exhaust area of all safety valves. 6, the safety valve should generally be installed exhaust pipe, exhaust pipe should be straight to a safe place, and have enough cross-sectional area, to ensure the smooth flow of exhaust steam. The bottom of the safety valve exhaust pipe should be put on airs and have a drain pipe connected to a safe place. No valve is allowed to be installed on the exhaust pipe and the drain pipe.

07-01

How to Avoid Failure of Butterfly Valve in Use

WATO Wuhan Weituo Fluid Equipment Control Equipment Co., Ltd Butterfly valve is a widely used valve, originated in the 30 s of last century, butterfly valve is a 90 degree switch, or adjust the flow of a valve, due to the butterfly valve structure is simple, small size, light weight, simple operation, resulting in butterfly valve in many conditions can be applied. Butterfly valve connection flange connection, wafer type connection, welding connection, etc., can also be based on different working conditions of the medium to choose different materials, butterfly valve can be made of cast iron, cast steel, stainless steel and so on. Of course, in the use of the process will inevitably have a fault, so we should try to avoid the butterfly valve in the use of the process of failure. Butterfly valve installation use matters needing attention: 1. Before installation, confirm whether the product performance and medium flow arrow of our factory are consistent with the movement conditions, and insert and wash the inner cavity of the valve. Impurities and foreign matters on the sealing ring and butterfly plate are not allowed. Before cleaning, the butterfly plate is never allowed to be closed to avoid damage to the sealing ring. 2. It is recommended to use special flange for disc valve for disc plate installation, namely HGJ54-91 socket welding steel flange, as shown in Figure 3 3. The best position for installation in the pipeline is vertical installation, but it cannot be inverted. 4, the use of the need to adjust the flow, a worm gear box to control. 5. For butterfly valves with more opening and closing times, open the worm gear box cover in about two months to check whether the butter is normal, and keep an appropriate amount of butter. 6, check the connection parts of the requirements of compression, that is, to ensure that the packing of the bee, but also to ensure that the stem rotation flexible. 7. Metal sealed butterfly valve products are not suitable for installation at the end of the pipeline. If they must be installed at the end of the pipeline, the matching outlet is required to prevent the sealing ring from overstock and overposition. 8. The valve stem installation and use reaction regularly check the use effect of the valve, and eliminate the failure in time.

07-01

What are the characteristics of ball valve widely used

WATO Wuhan Weituo Fluid Equipment Control Equipment Co., Ltd Ball valve is a new type of valve in the 1950 s. In a short period of more than 30 years, it is one of the valve varieties that have developed rapidly in the past ten years. It is mainly used to cut off, distribute and change the flow direction of the medium on the pipeline. The ball valve designed as a V-shaped opening also has a good flow adjustment function. Ball valve only need to rotate 90 degrees of operation and a small torque can be closed tightly. Completely equal body cavity for the medium to provide a small resistance, straight-through flow. The ball valve is not only simple in structure, good in sealing performance, but also small in size, light in weight, low in material consumption, small in installation size, small in driving torque, simple in operation, easy to realize rapid opening and closing, easy to operate and maintenance, suitable for general working media such as water, solvent, acid and natural gas, but also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined. Ball valve features: 1. The ball valve has low fluid resistance and low flow resistance (actually zero) 2. The ball valve opening and closing switch is quick and convenient. 3. The ball valve has good sealing performance. 4. The ball valve has a long service life. 5. The high reliability of the ball valve is mainly due: The ball and the valve seat a pair of sealing will not happen to scratch, rapid wear and other failures, in the work will not be stuck (in the absence of lubricant), it can be reliably applied with corrosive media and low boiling point liquid.; The built-in valve stem structure eliminates the potential accident that the valve stem may fly out due to the loosening of the packing gland under the action of fluid pressure; The use of anti-static, fire-resistant structure of the ball valve, suitable for transporting oil, natural gas, gas pipeline. 6. The smooth passage in the valve body is more suitable for conveying viscous fluid. slurry, and solid particles. Because it will not get stuck at work (when there is no lubricant), it can be reliably applied to corrosive media and low boiling point liquids. 8. The ball type closing part can be automatically positioned in position and can withstand the high pressure difference when closing. 9, in a large pressure and temperature range, can achieve complete two-way sealing. 10. When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface. 11, compact structure, light weight, it can be considered a reasonable valve structure for low temperature medium system.

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Wuhan Weituo Fluid Control Equipment Co., Ltd

Address: 1706, Building D, Wuhan Living Room, No.8 Hongtu Avenue, Dongxihu District, Wuhan City

Telephone:0086-18942929031 0086-18571829295

Landline:0086-027-83612831

Fax: 0086-027-83612830

E-mail:watosong@watovalve.com

Website:www.watovalve.com

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