The main components of gate valve are stem and disc, and the disc will move up and down under the drive of stem. Although the gate valve has good tightness and strong regulating function, its large volume, complex structure and long maintenance time are greatly restricted in the application of chemical system.
In the role of vertical rotation of the switch control, butterfly valve mainly plays a role of cutting and interception in the pipeline. The structure of butterfly valve is simple with strong ability to adapt to the environment. Control effect is more ideal.
Here are our gate valve and butterfly valve.
As the china DIN globe valve factory, ZJCLV also produce ball valve and butterfly valve. See more: www.clvvalve.com.
The globe valve is one of the most widely used valves in life. However, to reduce cost, butterfly valves can also be used in some places to replace globe valves. Although the butterfly valve is not used for adjustment, it has simple structure, seldom waste of materials and light weight. This also makes the price of butterfly valves low. This article will tell you about these two valves and compare them.
The Globe Valve
The globe valve is a forced sealing valve. The closing member (disc) of globe valves moves along the centerline of the valve seat. The opening and closing parts of the globe valves are plug-shaped discs, the sealing surface is flat or conical, and the disc moves linearly along the center line of the valve seat.
The Butterfly Valve
Butterfly valve uses circular butterfly plate as the opening and closing part and rotates with the valve stem to open, close and regulate the fluid channel. The butterfly plate is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis. The rotation angle is 0 ° ~ 90 °. When it rotates to 90 °, the valve is fully open.
The butterfly valve is applicable to the pipelines conveying various fluid media in the engineering systems of generator, gas, natural gas, liquefied petroleum gas, city gas, cold and hot air and so on.
1.The Working Principle
The globe valve closes when the sealing surface of the valve disc and the globe valve seat closely fit with the pressure of the valve rod to prevent the medium from flowing. A valve that uses a disc to open, close, or regulate the medium flow by reciprocating about 90 °. With good flow regulation function and closing sealing characteristics, the butterfly valve is not only simple in structure, small in volume, light in weight, low in material consumption, small in installation size and driving torque, simple and rapid in operation.
The globe valve has better regulating performance than the butterfly valve, while the butterfly valve perform not well. This is generally used in the occasion where only the switch is required.
The price of globe valves are higher than that of butterfly valves.
The globe valve is simple in structure, easy to manufacture and maintain, which also has good regulating performance. It is widely used in the transmission pipeline of various media. However, there is a change of direction when the fluid passes through the globe valve, so the resistance is large. Therefore, it is not suitable for the pipeline with high viscosity, containing suspended substances and easily crystallized materials, nor for the vent valve and the valve of low vacuum system. Globe valves are widely used in various pressure fluid pipelines, steam and compressed air pipelines. They are commonly used block valves, which are mainly used to connect or cut off the medium in the pipeline and regulate the flow. The globe valve is applicable to a wide range of pressure and temperature, but it is generally used for medium and small diameter pipes.
Butterfly valves, also known as flap valves, are simple control valves. Since the butterfly valve could not be closely matched with the pipe wall, it is only suitable for regulating the flow but cannot be used to cut off the pipeline. It is often used to regulate the flow on the pipeline conveying air and flue gas. Butterfly valves use the circular butterfly plate rotating with the stem as the opening and closing part. The butterfly valve is mainly used to cut and off. At the present, butterfly valves are used in low-pressure and large-diameter pipelines more frequently.
The valve stem of the globe valve has a relatively short opening or closing stroke with a reliable cut-off function. Because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating the flow.
The reason why the stop valve is popular is that the sealing surface friction is small when opening and closing, which is relatively durable. The opening height is not high, the manufacturing is easy, and the maintenance is convenient. It can also be made into a large caliber. Both valves can work well, but attention should be paid to the functions and characteristics of each valve when selecting.
We have more information about valves, it includes the globe valve size chart.