1. What is the difference between the gate valve and the globe valve?
Gate Valve VS. Globe Valve
1. The difference in structure
The structure of the gate valve is more complicated than that of the globe valve.
First of all, according to the structure of the gate valve, there are two types of gate valves: rising stem gate valves and non-rising stem gate valves, but globe valves don’t have this different design.
Secondly, in terms of appearance and structure, the face to face(length) of the gate valve is shorter than that of the globe valve, but the height is higher than that of the globe valve.
Therefore, the gate valve requires more installation space, especially the rising stem gate valve.
The rising stem gate valve is also called OS&Y design, which means Outside Stem and Yoke.
2. The difference in principle
The operation method of the gate valve and globe valve is the same, all can use a pneumatic actuator, electric actuator, or handwheel to drives the valve stem open and close the valve.
The difference between them is that the gate valve can only be fully opened and fully closed. And its travel/stroke is larger than the globe valve. It means that the opening and closing time of the gate valve is longer than the globe valve.
Due to the distance of plug to seat is short of globe valve, globe valve can be stopped at any travel during the movement for flow throttling. This is not available in gate valves.
In addition, when the gate valve is installed in the pipeline, there is no requirement for the direction of the inlet and outlet, and the medium can circulate in both directions. But the globe valve definitely has a direction of inlet and outlet. The flow direction of the globe valve can be down to up or up to down. Most flow type is from down to up for globe valve.
3. The difference in flow resistance
Because the gate valve can only be fully open and fully closed, when it is in a fully open state, the flow path in the entire pipeline is straight. When the medium flows through the valve body, there is nearly no obstruction, and the flow resistance is almost zero. In the globe valve, when the medium flows through the valve body, the flow direction is from top to bottom, and the resistance of the valve plug is relatively large.
4. The difference between maintenance costs
When the gate valve is maintained and repaired, the gate valve needs to be disassembled completely from the pipeline, so the labor costs are relatively high. But for the globe valve, In most cases, the valve seat and plug can be directly replaced on the site without disassembling the complete valve. Therefore, the globe valve is suitable for welding connection applications.
2. What is the difference between the globe valve and the ball valve?
Globe Valve VS. Ball Valve
The ball valve and globe valve both can be shut off the fluid of the pipeline.
The ball valve is evolved from the plug valve. Its opening and closing part is a sphere, which uses the sphere to rotate 90° around the axis of the valve stem to achieve the purpose of opening and closing.
Advantages of ball valves:
1. Ball valve has the lowest flow resistance.
2. It can action fast opening and closing.
3. With compact structure and lightweight, the ball valve can be considered as the most reasonable valve structure for cryogenic media systems.
4. The ball valve body uses an asymmetrical design, especially the welded valve body structure, which can withstand the stress from the pipeline well.
Disadvantages of ball valves:
The throttling performance is worse than that of the globe valve, especially the pneumatic globe type control valve (or electric globe type control valve).
The globe valve is used to cut off the flow of the medium and is suitable for occasions that need to be opened very frequently. The most commonly used is in a chemical plant.
Advantages of globe valve:
1. Simple structure, convenient manufacturing, and maintenance.
2. The working stroke is small, and the opening and closing time is short.
3. Good sealing performance, small friction between the sealing surfaces and plug, and long service life.
Disadvantages of globe valve:
1. The fluid resistance is large, and the force required for opening and closing is large.
2. It is not suitable for media with particles, high viscosity, and coking medium.
3. The fluid resistance is large, and the reliability of the seal is not suitable during long-term operation.
3. What is the difference between the globe valve and the butterfly valve?
Globe Valve VS. Butterfly Valve
Globe valve and butterfly valve both are common valves in industrial processes. What is the difference between the globe valve and the butterfly valve? The globe valve and the butterfly valve have similar functions, both of globe valve and butterfly valve can be used for flow regulating or cut off. The difference is that the globe valve has a better flow adjusting function when it is used to controlling the flow rate. The advantage of the butterfly valve is that it is more widely used, has a large flow capacity, shorter structure length, and a simpler structure.
The globe valve only allows the medium to flow in one direction when installed. The opening or closing stroke of the valve stem of the globe valve is relatively short, and it has a reliable shut-off function. Due to the response of the valve seat is proportional to the stroke of the valve plug, it is very suitable for flow adjustment. Therefore, this type of shut-off valve is very suitable for cutting off or regulating and throttling. The structural length of the globe valve is larger than butterfly valve.
A Butterfly valve is a rotary motion valve, which consists of four main parts: valve body, stem, disk and seat. A butterfly valve has a disc which is mounted on a rotating shaft. When the butterfly valve is fully closed, the disk back to seat and completely blocks the line. When the butterfly valve is fully opened, the disc is at a right angle to control the flow of gas or liquid.
Butterfly valve is a simple regulating valve, and it can also be used for on-off control of low-pressure pipeline media. There are many types of butterfly valves and used for wide range application. Butterfly valves are suitable for pipelines that transport various corrosive and non-corrosive fluid media in engineering systems such as generators, natural gas, petroleum, air, chemical and power plant, and are used for controlling and on/off medium. Butterfly valves have two-way sealing and one-way sealing.
4. What is the difference between the globe valve and the plug valve?
Globe Valve VS. Plug Valve
In total plug valve has a compact structure and a small volume, compared with a gate valve, the height of the valve is greatly reduced, also fluid resistance is greatly reduced.
A plug valve is a rotary type valve, the plug shaped like a cone or cylinder. It can be rotated inside the valve body to control the flow of fluids.
The opening process of the plug valve: When opening the valve, you need to rotate the handwheel to raise the plug and disengage it from the sealing surface. Rotate the handle 90° to make the passage of the plug communicate with the passage of the valve body, then to achieve the purpose of opening. The process of closing the valve is to rotate the handle 90° to make the passage of the plug perpendicular to the passage of the valve body, and then rotate the handwheel to lower the plug to achieve the seal.
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