Valve type: Low load butterfly valve
Caliber range: DN50 to DN2000
Pressure range: PN2.5-PN10, ANSI 150
Temperature range: -29 to+600 ℃
Leakage level: 2% (open), 0.4% (inclined plate)
Main material: Q235, 304, 316, etc
Drive device: pneumatic, electric

Analysis of the actual use of low load butterfly valves:

The sealing performance requirements for low load regulating butterfly valves used for medium regulation are somewhat different from those for metal sealed butterfly valves. As a dust containing flue gas control device in the pipeline network, leaving a certain gap in the closed position will not affect the automatic control of the furnace pressure by adjusting the pipeline opening. The fluid characteristics of low load butterfly valves are similar to those of metal sealed butterfly valves, and the relationship between butterfly valve opening and flow rate is basically a linear proportional system. If used to control flow, its flow characteristics are closely related to the flow resistance coefficient of the supporting pipeline. If the diameter and form of the valves installed in two pipelines are exactly the same but the loss coefficients of the pipelines are different, the flow rate of the valves will differ greatly. If the valve is in a state with a large throttling amplitude and the butterfly plate is in the middle opening during the closing process, the upper and lower sides of the butterfly plate can form completely different states. One side of the butterfly plate moves in the direction of the medium flow, while the other side moves against the direction of the medium flow. Therefore, one side of the valve body and butterfly plate form a nozzle shaped opening, while the other side has a throttle hole shaped opening. The flow rate on the nozzle side is much faster than that on the throttle side, and negative pressure is often generated on one side of the throttle side. Therefore, when installing low load butterfly valves horizontally, the nozzle side should be placed at the lower part of the pipeline to avoid the occurrence of ash blockage at the valve connection of the pipeline.