The flue gate valve is an indispensable and important boiler accessory in large coal-fired boiler factories. Its function is to close the flue gate valve when entering the boiler maintenance period. The flow of flue gas prevents high-temperature corrosion flue gas from backflowing into the flue and causing damage to the dust removal equipment inside the flue and the boiler body. Absolute zero leakage of flue gas can also ensure the health of boiler maintenance personnel, so choose a high-quality , A sturdy and durable flue gate valve is necessary.
According to different drive structures, flue gate valves are divided into screw actuator type gate valves, hydraulic cylinder type gate valves and electric reducer type gate valves. Due to its driving structure problems, the screw actuator type flue gate valve has its disadvantages fully exposed after long-term use by customers, so it is gradually eliminated in the market.
The hydraulic cylinder gate valve uses a hydraulic oil pump to push the cylinder oil rod to expand and contract to open and close the gate. However, due to the harsh use environment in the factory, the hydraulic cylinder gate valve is not used in the factory. During use, due to the high-temperature corrosiveness in the flue gas, long-term use can easily cause the oil cylinder oil seal ring inside the plug-in plate to fall off and be damaged. Oil leakage from the oil cylinder will cause power loss, and the plug-in plate cannot be opened and closed, which can easily lead to serious smoke. leakage phenomenon. Since the power structure of the hydraulic flue gate valve is in the middle of the gate, when dust accumulation causes different friction resistance on both sides, the gate is prone to jitter and jamming during the opening and closing process. In severe cases, the plug-in board may become stuck, ranging from flue gas leakage to severe cases in which the plug-in board cannot be closed or is even damaged. The cost of using the flue gate valve is greatly increased.
The electric reducer-type flue gate valve is a new patented product launched on the market. It retains the high torque of the hydraulic cylinder flue gate valve and has been communicated with customers for many times. After actual observation at the customer's site, a flue gate valve was designed from the perspective of the customer's actual use. The electric reducer drives the gears on both sides of the bearing and runs precisely and smoothly on the racks on both sides of the flue gate valve frame, which solves the problem of plug-in plate jamming and shaking caused by different frictional resistances.
All power structures are located above the plug-in plate, which not only solves the problem of power loss caused by damage to the sealing ring of the hydraulic flue plug-in plate valve, but the internal space of the plug-in plate can also be filled with high-temperature corrosion-resistant aluminum silicate material, greatly extending the service life of the plug-in board. According to customer feedback, after long-term use, dust in the flue gas tends to accumulate at the bottom of the plug-in board, and the plug-in board may not close properly. Therefore, the new electric flue gate valve has a patented bottom cleaning tank, which not only solves the problem of dust accumulation at the bottom, but also saves the maintenance time and cost of maintenance personnel.