What is a Globe Valve
A globe valve is a linear motion valve used to stop, start, and regulate fluid flow.The globe valve disk can be totally removed from the flow path or it can completely close the flow path. Distinguished property or advantage of this flow control valve is throttling of fluids with good characteristics.You might have often see this valve at the discharge side of pumps for flow control. At the pump discharge side,this valve is often used in combination with check valve and gate valve for better operation and isolation.
Principle of globe valve operation
The essential principle of globe valve operation is the perpendicular movement of the disk away from the seat. This causes the annular space between the disk and seat ring to gradually close as the valve is closed.
This characteristic gives the globe valve good throttling ability, which permits its use in regulating flow.Therefore, the globe valve may be used for both stopping and starting fluid flow and for regulating flow. When compared to a gate valve, a globe valve generally yields much less seat leakage. This is because the disk-to-seat ring contact is more at right angles, which permits the force of closing to tightly seat the disk.
Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow. When the disk closes against the direction of flow, the kinetic energy of the fluid impedes closing but aids opening of the valve. When the disk closes in the same direction of flow, the kinetic energy of the fluid aids closing but impedes opening. This characteristic is preferable to other designs when quick-acting stop valves are necessary.