Patented design of "large flat key (pin) of embedded valve shaft": butterfly valve is mainly opened by driving the "valve shaft" to rotate 90 degrees through worm gear and other transmission mechanisms. The connection between the "valve shaft" and the "valve plate" (or "butterfly plate") is mainly fixed by the "pin". Traditional pins are mostly "pins", regardless of the torque of "taper pin", "through pin", "across the seam pin", "oblique pin", etc The diameter of. As the valve plate is subject to long-term impact and vibration (or co shock) of water power, the pin will fall off or twist off from the valve plate, thus making the valve unable to open and close. The "embedded valve shaft large flat key (PIN)" designed by our company is based on the traditional design. A rectangular flat key is embedded in the "shaft hole" of the combination of the valve shaft and the valve plate, which increases the torque area by 3 times compared with the traditional pin diameter without weakening the strength of the valve shaft. Thereby providing a permanent connection between the valve shaft and the valve plate.

Connection design of "valve shaft spline": traditionally, the valve shaft and worm gear box and other transmission mechanisms are connected by "flat key". Its disadvantage is that the flat key will be squeezed and deformed in the process of long-term opening and closing, resulting in excessive clearance, which will cause the valve to not be completely closed. The "spline" connection design adopted by our company has the following advantages: 1. Due to the large number of spline teeth and large contact area, the bearing capacity is large. 2. Worm gear and other transmission mechanisms are well aligned with the shaft, and the fit clearance is small. 3. The operating direction of the transmission mechanism can be adjusted at will according to the user's needs. Spline connection is generally used in aircraft, automobile and machine tool manufacturing.

"Full waterproof worm gear box" design: since the pipeline valves are usually installed in the field environment, there is water in the valve well and the worm gear box will rust due to water inflow after long-term dampness. The "fully waterproof worm gear box" designed by our company is sealed with "O" ring at the connection of parts. Each worm gear box is delivered after passing the gas seal pressure test and inspection to ensure that it is sealed under the water level of 5m. It is especially suitable for use under harsh environmental conditions such as seaside, saline alkali land and underground pollution.

"Plastic spraying" process: the inner cavity and outer part of the valve are treated with epoxy resin, which effectively prevents corrosion of various acid and alkali media and meets the national drinking water safety evaluation standard for drinking water transmission and distribution equipment and protective materials (GB/T 17219).