The development of my country's economy and science and technology has been inseparable from the work of many types of equipment. For example, in the process of regulating flow, the role of valves is very prominent. With the use and development of valves, the types and models of valves have gradually increased. Gate valves and globe valves are two of the most representative products. What are the differences between gate valves and globe valves?
Gate valve: The gate of the gatevalves moves linearly with the valve stem, which is called a lift-rod gate valve and an open-road gate valve. Usually, there is a trapezoidal thread on the lift rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into a linear motion, that is, the operating torque is changed into an operating thrust.
Globe valve: The valve plays an important role in cutting and throttling the medium in the pipeline where it is located. As an extremely important cut-off valve, the valve is sealed by applying torque to the valve stem, and the valve stem is in the axial direction. Pressure is applied to the valve disc in the direction to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit, preventing the medium from leaking along the gap between the sealing surfaces.
Advantages and disadvantages of gate valve: small flow resistance. The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small. It is more labour-saving when opening and closing. Compared with the valve globe type, whether it is open or closed, the direction of movement of the gate is perpendicular to the flow direction of the medium. However, it is easy to cause erosion and scratches between the sealing surfaces, and maintenance is more difficult. The external size is large, a certain space is required to open, and the opening and closing time is long. The structure is more complicated.
Advantages and disadvantages of globe valve: The structure of globe valve is simpler than that of gate valve, and it is more convenient to manufacture and maintain. The sealing surface is not easy to be worn and scratched, and the sealing performance is good. There is no relative difference between the valve disc and the valve body sealing surface when opening and closing.
The maintenance of the gate valve is not suitable for on-site pipelines, and the valve seat and disc of most globe valves can be replaced online without removing the entire valve control systems from the pipeline that is very suitable.
Through the analysis of the working principle, advantages and disadvantages, structure, maintenance process and other contents of the gate valve and globe valve, we have been able to further understand the characteristics of the valve. Although in some fields, the difference between which valve is used is not so important, but with the economic With the development of the industry, the needs of many industries are also increasing, and choosing the right valve may have a very important impact on the work.
