Both the handle butterfly valve and the worm gear butterfly valve are valves that require manual operation. They are commonly referred to as manual butterfly valves, but there are still differences in the use of the two.
1. Handle butterfly valve The handle rod directly drives the valve plate, which switches quickly but is laborious; the worm gear butterfly valve drives the valve plate through the worm gear, which switches slowly but saves effort. Therefore, when the pressure in the pipeline is high, it will be particularly laborious to select the handle butterfly valve. Dongsheng Valve recommends that you use the worm gear butterfly valve.
2. The butterfly valve commonly used in engineering is generally the worm gear butterfly valve, because in addition to saving effort, its sealing performance is also better than that of the handle butterfly valve, especially in the environment with high switching frequency, the service life of the worm gear butterfly valve will be longer than that of the handle butterfly valve.
3. Handle butterfly valves are generally used with small diameters (within DN200), because generally small-diameter butterfly valves have lower torque and can be opened and closed directly by hand, while worm gear butterfly valves use a gear box to drive the valve stem to rotate, which is more labor-saving.
Selection principle of handle drive and worm gear drive
When the torque of the valve stem is greater than 300N·M, it is driven by a gear box, and the rest is generally driven by a handle.
Post time: Nov-11-2021