The Difference between Globe Valves and Gate Valves

Due to some similarities in appearance between globe valves and gate valves, as well as their ability to cut off in pipelines, many people may confuse the two valves. If you observe carefully, the difference between globe valves and gate valves is quite significant.

1. Valve structure

The structure of gate valves is more complex than globe valves. From the appearance, the gate valve is higher than the globe valve, and the structural length of the globe valve is longer than the gate valve. In addition, there are two types of gate valves: rising stem gate valves and non-rising stem gate valves.

2. Sealing surfaces

The sealing surface of the globe valve is a small trapezoidal side of the valve core (depending on the shape of the valve core). The gate valve is sealed by the outer edge of the wedge.

3. Specific functions

The globe valves can be used for both cut-off and rough flow regulation. The globe valve is an S-shaped flow channel, so the fluid resistance is relatively high; the opening and closing stroke is short, about 1/4 of the valve seat diameter. When the gate valve is fully opened, the medium flow resistance in the valve body channel is almost zero. The travel of the gate valve is slightly larger than the diameter of the valve and pipeline, so the opening and closing time is long.

4. Installation

There are differences in the installation of globe valves and gate valves. The flow direction of the gate valve has the same effect in both directions, and there is no requirement for inlet and outlet direction during installation. The medium can flow in both directions. The globe valve needs to be installed strictly in the direction indicated by the arrow on the valve body.