View our wide range of brass pneumatic angle seat valves. Angle seat valves are designed to have the valve seat placed at an angle in a Y-shape, which is advantageous because it allows the medium to flow through relatively easily (few bends) for minimal flow and pressure loss. They have better flow characteristics than vertical globe valves. It operates by having a spindle move in a linear motion by an air-operated piston to move the seal towards or away from the valve seat. This seal is usually PTFE (teflon) and the valve housing is brass. Angle seat valves are reliable, durable, require low maintenance and are characterized by a long lifespan with millions of cycles. They can be used in applications for gases, vacuum or (viscous) liquids and offer a seal in both in and out directions. Other names for these valves are shut-off valves, Y-valves or angle seat piston valves. The valve generally closes in the same direction as the flow direction. There are special versions where the valve closes against the flow direction, in order to reduce the risk of water hammer.