Working principle of globe valve:

Assuming there is a water supply pipe with a cover, water is injected from the bottom of the pipe and discharged toward the mouth of the pipe. The cover of the outlet pipe is equivalent to the closing part of the stop valve. If the pipe cover is lifted up by hand, the water will be discharged outside. Cover the tube cap with your hand, and the water will stop swimming, which is equivalent to the principle of a stop valve.

The characteristics of globe valve:

Simple structure, high precision, convenient production and maintenance, large water friction resistance, can control flow; when installed, low in and high out, directional; specifically used in hot and cold water supply and high pressure steam pipelines, not applicable Solvents with particulate matter and high viscosity.

Ball valve working principle:

When the ball valve rotates 90 degrees, the spherical surface should be fully displayed at the inlet and outlet, and then the valve is closed to cut off the swimming of the solvent. When the ball valve rotates 90 degrees, there should be ball openings at the entrance and the intersection, and then open and swim, and there is basically no flow resistance.

Characteristics of ball valves:

The ball valve is very convenient, fast, and labor-saving to use. Usually, it is enough to turn the valve handle 90 degrees, and the ball valve can be used on fluids that are not very pure (containing solid particles) because its spherical valve core acts on the fluid when it is opened and closed. is the cutting motion.

Working principle of gate valve:

Gate valve, also called gate valve, is a widely used valve. Its closing and closing working principle is that the sealing surface of the gate plate and the sealing surface of the valve seat are highly smooth and consistent, and they fit together to block the flow of the medium liquid, and improve the sealing performance by means of the spring or the physical model of the gate plate. actual effect. The gate valve mainly plays the role of cutting off the flow of liquid in the pipeline.

Features of gate valve:

The sealing performance is better than that of the globe valve, the fluid friction resistance is small, the opening and closing is less labor-saving, the sealing surface is less eroded by the solvent when fully open, and is not limited by the flow direction of the material. The size is high, a certain space is required for opening and closing, and the opening and closing time interval is long. The sealing surface is easy to be eroded and cut when opening and closing. The two sealing pairs pose difficulties for production, processing and maintenance.

Summary of the differences between globe valves, ball valves and gate valves:

Ball valves and gate valves are usually used for fluid control switch and cut-off, usually not for flow regulation, while globe valves can be used for flow control in addition to fluid control switch and cut-off. When you need to adjust the flow rate, it is more suitable to use a stop valve behind the meter. Control switch and cut-off applications use gate valves in consideration of economy, and gate valves are much cheaper. Or use gate valves on large-diameter, low-pressure oil, steam, and water pipelines. Considering the tightness, ball valves are used. Ball valves can be used in working conditions with high leakage standards, suitable for rapid opening and closing, and their safety performance and life expectancy are better than those of gate valves.