What's the difference between a globe valve and a gate valve?Globe valves, gate valves, butterfly valves, check valves, ball valves, etc., are now indispensable control components in various piping systems.
Each type of valve differs in appearance, structure, and even functional use. However, the globe valve and the gate valve have some similarities in appearance, and at the same time they all have the function of truncating in the pipeline. Therefore, many friends who have little contact with the valve will confuse the two. In fact, if you look closely, the difference between the globe valve and the gate valve is still quite large.
1 The operating principle of globe valve and gate valve is different
When the globe valve is opened and closed, it is in the form of a rising stem, that is, it turns the handwheel and the handwheel will follow the stem to rotate and lift.And the gate valve is to turn the hand wheel, so that the stem do lifting movement, the hand wheel itself position is unchanged.In addition, the gate valve can only be fully opened or fully closed. The trip of the gate plate is large and the opening and closing time is long.The movement stroke of the stop valve's disc is much smaller, and the stop valve's disc can stop at a certain point during the movement for flow regulation.Gate valves can only be used for truncation and have no other functions.
2 Performance difference between globe valve and gate valve
Globe valve can be used for truncation and flow adjustment.The fluid resistance of the globe valve is large, and it is more difficult to open and close, but because the distance between the valve plate and the sealing surface is short, the opening and closing stroke is short.
Gate valves can only be fully open and close, it in the fully open, the body channel within the medium flow resistance is almost zero, so the valve opening and closing will be very effort, but the sealing face distance gate distance, opening and closing time is long.
3. Difference of installation flow between globe valve and gate valve
The effect of gate valve flow is the same in both directions. The installation has no requirement of inlet and outlet direction, and the medium can flow in both directions.Globe valves may need to be done in strict accordance with the valve body in the direction of the arrow installation, import and export direction and a clear stipulation about the globe valve, China valve "three for" the flow of globe valves shall be applied.
4. Structural differences between globe valve and gate valve
The structure of gate valves is more complex than that of globe valves. In terms of appearance, in the same caliber, gate valves are higher than globe valves, and the globe valves are longer than gate valves.In addition, gate valves also have the distinction of ring stem and non ring stems.No globe valve.