Regulating or Throttling Valves
Valves are used to control or throttle the flow of fluids.
GLOBE VALVE
Globe valves are generally used in small-diameter piping
When a globe valve is opened, the surface of the disc moves away from the valve seat
The fluid flows through the valve and changes direction as it moves up and over the valve seat.
Because globe valves are designed for through they resist fluid flow well and the disc wears evenly.
Globe valves are adjusted with very few turns compared with gate valves.
Globe valves are often used in service requiring frequent valve opening and closing
NEEDLE VALVE
Needle valves use a long narrow, pointed plug to provide precise control of flow.
Needle valves are normally used in small diameter piping. Because the diameter of the valve seat is smaller, the amount of fluid flow is reduced even when the valve is fully open.
Fluid flow is easily controlled by moving the needle point of the plug into the seat.
ANGLE VALVE
Angle Valves have the same basic design and operating characteristics as globe valves.
When installed in the piping system, they provide the 90o turn of a piping elbow. As a result, fewer fittings and pipe joints are needed.
Valve seat Design
