1. Butterfly valve for skylight

2. Electronic butterfly valve adjuster having continuous fault monitoring system

3. Actuated ball valve and Actuated butterfly valve options from Grainger help automate the starting and stopping of flows

4. The invention is useful for controlling the position of the air admission butterfly valve for internal combustion engines.

5. An engine braking system includes a butterfly valve located in the exhaust system upstream of a partial admission engine turbocharger.

6. According to the butterfly valve device of the present invention, a guide groove is formed in a guide unit to guide rotation and vertical operation of a main shaft and thus friction, that is, contact stress does not occur during contact between a blade and a fluid passage, thereby preventing abrasion of an O-ring.