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Stainless steel gate valve principle knowledge popularization and matters needing attention in use

by:Sino Valves     2021-11-28
Stainless steel gate valve is one of the most widely used gate valves. It is loved by the public because of its low resistance and simple shape. So how does it work? then, let's watch it together. The working principle of the stainless steel gate valve: the gate plate of the gate valve moves linearly with the valve stem, which is called the lifting stem gate valve (also called the rising stem gate valve). Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust. The sealing surface can be sealed only by the pressure of the medium, that is, relying on the pressure of the medium to press the sealing surface of the gate against the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface. The characteristics of stainless steel gate valve: 1. Exquisite selection of materials, in line with relevant domestic and foreign standards, and high overall quality of materials. 2. It meets the requirements of advanced standards at home and abroad, with reliable sealing, excellent performance and beautiful appearance. 3. The sealing pair is advanced and reasonable. The sealing surface of the gate and the valve seat is made of Stellite cobalt-based cemented carbide with different hardness. The sealing is reliable, high hardness, wear resistance, high temperature resistance, and corrosion resistance. , Good scratch resistance and long life. 4. After quenching and tempering and surface nitriding treatment, the valve stem has good corrosion resistance, scratch resistance and wear resistance. 5. It adopts wedge-type elastic gate structure, with thrust bearing in medium and large diameter, with small friction force, and equipped with impact manual operation, which makes it easy to open and close. The electric gate valve can be installed on a horizontal or vertical pipeline. The double gate valve should be installed on a horizontal pipeline, and the first wheel is located above the valve, and it is not allowed to be installed downwards. The gate valve is not restricted to the flow direction of the medium. Electric gate valves cover explosion-proof electric gate valves, stainless steel electric gate valves, electric flat gate valves, etc. The electric gate valve actuator can be selected according to the customer's intelligent integrated type, ordinary outdoor type, etc. The connection method is usually flange connection, and it is also useful for welding connection in special occasions. At high temperature and high pressure, the medium of the electric gate valve may wedge the gate due to temperature changes, and at the same time, because of the uneven temperature of the medium everywhere, it is easy to produce poor sealing. The wedge gate valve is especially obvious. When the opening and closing torque of the electric gate valve is large, in order to reduce the opening and closing torque, for large-diameter and high-pressure gate valves, a bypass valve can be installed. The bypass valve is installed outside the main gate valve, and the inlet and outlet are connected to and communicated with both sides of the gate valve. The bypass valve should be opened before the main valve is opened. After the medium enters the valve, the pressure difference between the front and rear of the main gate valve plate is reduced, thereby reducing the opening torque of the main gate valve. The selection of the diameter of the bypass valve should be considered according to the available requirements of the main gate valve diameter. The sealing performance of the gate valve is not as good as that of the stop valve. The gate valve is a stop valve. The gate valve is usually suitable for working conditions that do not need to be opened and closed frequently and keep the gate plate fully open or fully closed. It is not suitable for adjusting the flow and pressure of the medium. If used for long-term adjustment, the sealing surface is easily eroded and worn by the medium, which will affect the sealing performance. In order to ensure the normal operation of the stainless steel gate valve and extend the service life, regular inspection and maintenance work must be done: aquatic organisms, weeds, dirt, and stagnant water that often adhere to the stainless steel gate valve should be removed in time to prevent floating debris in front of the gate. Blocks and debris fall into the door slot. Gates on sediment-laden rivers must be discharged regularly to prevent siltation; trash racks must be cleaned regularly. To prevent the gate from being subjected to static ice pressure in winter, non-freezing tanks or other measures can be taken to separate the gate from the ice layer. Check the working status of the gate frequently, and take measures to remove rust, prevent leakage, prevent leakage, prevent vibration, and prevent cavitation in response to defects that may appear or have been exposed to ensure the maintenance of stainless steel gate valves, gate piers, working bridges and other buildings. Safety. The stainless steel gate valve should be locked when suspended in the door groove, and the bottom of the door should be a certain distance above the top of the orifice to prevent the gate from blocking water. Lubricating oil should be added to the rotating parts frequently, and the gate should be checked for deformation, cracks, desoldering, etc., whether various couplings and embeddings are loose or falling off, whether the structure of the lifting point is firm, and whether the water seal is aging or damaged Whether it is in close contact with the water seal, if there is any problem, it should be dealt with in time. Open and close stainless steel gate valves must strictly abide by the operating procedures to prevent the gate from being damaged or causing other undesirable consequences. If vibration occurs when the stainless steel gate valve is discharged, the gate opening should be adjusted through tests, or other anti-vibration measures should be taken. This article was edited and published by Valve (Technical Department)
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