... material: Carbon steel, Stainless steel, Alloy steel, Bronze, etc Operation: Hand Wheel, Gear, Electric, Pneumatic, etc Medium: Air, Water, Oil Main ... is opened or closed by the valve clack moving to-and-fro through the valve body guiding axle under the spring effect ... can be installed on horizontal and vertical pipelines. 2. The valve body passageway is designed in a wing-shaped streamline type ...