Globe valve control the flow by the linear motion of disk, they are used in many industries, and it's vital to learn about the valve before using it.
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There are several basic components of a Globe valve.
Bonnet provides a leakproof closure for the globe valve body. Globe valve can have two types of bonnets. Screw-in Bonnet; is a simple type of bonnet bolted to the body with high bolting torque. It provides a durable and pressure-tight seal. The other one is Union Bonnet; it is suitable for places where frequent cleaning and inspecting is done.
The part that surrounds the plug is called the cage. It is present inside the valve's body and significantly influences the flow through the valve. As the plug or disk is moved, more part of the cage is exposed, and the flow will increase.
The stem is the component that joins the handwheel to the disk/plug. It transfers the force from the handwheel to the disc, which consequently controls the flow. Stem is a smooth rod with threaded ends to move up and down with the rotation of the handwheel.
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The disk is the part that sits on the seat and stops the flow. Disk is attached to the stem and moves with the rotation of the handwheel. There are two types of plugs. Unbalanced plugs are solid and typically used in small globe valves with low-pressure drop. While the balanced plug has holes, it is easy to shut this plug because we don't have to fight with static force.
The last part is the seat; it provides a stable surface for the disk to shut off. It is either screwed or integrated into the body.
The working of the globe valve is straightforward. When the handwheel is rotated in a clockwise direction, the stem will move downward, pushing the disk towards the seat. Lesser the difference between the seat and plug, the lesser will be the flow and vice versa. In the end, the disk will sit tightly over the seat ring, completely shutting off the fluid flow.
Similarly, the anti-clockwise movement will pull the disk away from the seat, which will open the valve allowing the fluid to flow freely.
Globe Valve Cast Iron (25 mm) is an innovative valve design that allows water to flow through the valve without clogging or leaking. The unique shape of the GLOBE Valve creates a seal around the stem of the valve, preventing any debris from entering the system. This prevents sediment build up which can cause problems such as reduced pressure, leaks, and poor performance.
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