The Difference Between Several Common Butterfly Valves

What is the difference between a worm gear butterfly valve and a manual butterfly valve?

The worm wheel can open and close the valve very lightly, which is labor-saving, and reliably closes and opens in place. Manually, it is relatively laborious to open and close, but the manual action is fast. Switch quickly. Worm gears are generally used for large diameters.

What is the difference between a wafer handle butterfly valve and a worm gear butterfly valve, and where are they used?

The main difference between the wafer handle butterfly valve and the worm gear butterfly valve is the different transmission mode, which is mainly determined by the size and opening and closing torque of the two valves.

The handle butterfly valve usually adopts a small diameter, because the torque of a small diameter is relatively small, and it can be opened and closed by hand

Worm gear butterfly valves generally use a gear box to drive the valve stem to rotate

The selection principle is that when the torque of the valve stem is greater than 300N.M, the gearbox is used for driving, and the gearbox is controlled by the handwheel, and the handwheel force is not more than 300Nm.

3. What is the difference between a worm gear wafer butterfly valve and a centerline worm gear butterfly valve?

The structure is the same, but the model is different. The center line refers to an eccentric structure of the butterfly valve (371). The wafer butterfly valve can be made of 371 or 373. In more detail, the pair clamp can be a center line type 1 single eccentric 2 double eccentric 3 is 371372373 center line, then it can be flange connection or a clamp connection

4. What is the difference between a manual rubber-lined butterfly valve and a manual butterfly valve?

From the appearance point of view, the difference between the manual rubber-lined butterfly valve and the manual butterfly valve is:

For general manual butterfly valves, the material of the valve plate is carbon steel, and the surface appears to have a certain metallic luster.

Manual rubber-lined butterfly valve, the valve plate is lined with a layer of glue, which does not look like metal luster.

The difference in media:

Manual butterfly valve can not be used in corrosive medium, mainly used in water medium.

The manual rubber-lined butterfly valve can be used in a certain corrosive medium, because the manual rubber-lined butterfly valve has a certain resistance to alkali salt and weak acid corrosion.