Connection form: the connection form of the handle butterfly valve mainly has the wafer and the flange two kinds, usually, the flange price will be slightly higher than the wafer.
Drive form: the drive form of handle butterfly valve is the handle, the common handle has the big iron handle, the punching handle, the aluminum handle. There is not much difference in price between the heavy iron handle and the ram handle, but the heavy iron handle is more robust and corrosion resistant. Aluminum handles are relatively expensive.
Material of valve body: common material of handle butterfly valve is cast iron, ductile iron, carbon steel, stainless steel, etc.
Structure: handle butterfly valve because of its own restrictions, can only be the form of the middle line butterfly valve, the middle line butterfly valve is generally soft seal, affect its price is sealed valve seat material, commonly used epdm, NBR, ptfe.