The globe valve comprises the disc, stem, seat, bonnet, hand wheel, and packing gland. The disc moves in a straight line along the seat's centreline to open and close the valve. In the globe valve, the stem axis is perpendicular to the sealing surface of the valve seat. This facilitates a quick opening and closing, making the globe valve apt to adjust and throttle the flow.
Also Read : Globe Valve Parts And Types
In a gate valve, the gate plate moves in a straight line parallel to the stem. These valves are lightweight with a flat bottom seat gate, integral glue coating and precision casting valve body. Gate valves are shut-off valves designed to close and open completely to allow unrestricted flow.
The butterfly valve is simple and small in comparison to the gate and globe valves. Their lightweight and compact design make them suitable for installation in compact spaces. In addition, the disc has a 90-degree reciprocating rotation capacity which makes it suitable to regulate the flow and facilitate a complete, leak-proof shut-off.
The globe valve is designed to raise and lift the stem when the handwheel is operated. The flow can happen only in one direction and only as indicated by the arrow on the valve. It can handle high pressures and temperatures, regulate the flow in the pipeline and is very useful for throttling purposes.
The disc moves around its own axis in a butterfly valve to facilitate complete or partial opening and closing. This makes the butterfly valve very apt for flows that need to be regulated and for particle isolation. The main characteristic of this valve is the change in the deflection of the butterfly disc, making it suitable for large diameter applications.
The gate valve is a compete on and off valve. The media is controlled by the gate plate, which can only open or close completely. As a result, the pressure drop is very less, and the flow is bi-directional. The design of the gate is mostly wedge-shaped or knife-shaped and does not facilitate flow regulation. The ends of the valve are either flanged or threaded.
Globe valves have a high-pressure drop when they function even in fully open conditions. They provide a good resistance to fluid flow because the stem opening and closing is very short and has a reliable cut-off function. However, globe valves tend to trap a lot of media. Therefore, globe valves are highly preferred in functions where the flow has to be calculated with precision. The complexity of its design allows the valve to cover a wide flow of ranges, services and applications.
The butterfly valve incredibly fast opening and closing speed also make it suitable for flow regulation, throttling, and adjustment control. However, the pressure loss is larger than the globe and gate valve. Hence, when choosing a butterfly valve, the pressure loss should be taken into consideration. In addition, the operating temperature limitations should also be taken into account.
The gate valve has the most minimum pressure drop, thanks to its competitive open and close mechanism. It offers no resistance to the flow of media, which makes it unsuitable for controlled applications. The straight-through flow path ensures minimum turbulence and erosion. Media accumulation is almost nil in gate valves.
When it comes to cost, globe valves are on the higher end. On the other hand, gate and butterfly valves are more economical, and their design is quite compact. They are also lightweight. However, all three valves can be customised as per the application.
As a foremost industrial valve supplier, Oilway has a global presence and an extensive network of operations to cater to our client's requirements. We manufacture the finest, high-precision industrial globes for large and small industries across several countries. Customisation is one of our specialities, and prompt delivery is a promise.
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