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The Difference Between Electric Gate Valve and Electric Globe Valve

 1. Different sealing surfaces
Motorized Cuniform Gate Valve is always in contact with and rubs against the sealing surface of the valve seat when opening and closing, so the sealing surface is easy to wear, especially when the valve is close to the closed state, the pressure difference between the front and back of the valve core is very large Larger, the sealing surface wear is more serious; and once the valve flap of the shut-off valve is in the open state, there is no longer contact between its valve seat and valve flap sealing surface, so its sealing surface mechanical wear is small, but the medium If it contains solid particles, it is easy to damage the sealing surface. The sealing surface of the gate valve has a certain self-sealing ability, and its valve core is tightly contacted with the sealing surface of the valve seat by the pressure of the medium, so as to be tight and leak-proof.
The inclination of the spool of the wedge gate valve is generally 3-6 degrees. When the valve is forced to close excessively or the temperature changes greatly, the spool is easily stuck. Therefore, high-temperature, high-pressure wedge gate valves have taken certain measures to prevent the valve core from jamming. The sealing surface of the shut-off valve must be forced to close the valve to achieve the seal. Under the same caliber, working pressure and the same driving device, the driving torque of the shut-off valve is 2.5-3.5 times that of the gate valve. This should be paid attention to when adjusting the torque control mechanism of the electric valve.
The sealing surfaces of the shut-off valve only contact each other when they are fully closed, and the relative sliding amount of the forcibly closed valve core and the sealing surface is very small, so the wear of the sealing surface is also very small. The wear of the sealing surface of the globe valve is mostly due to the presence of debris before the valve core and the sealing surface, or due to the lack of tightness in the closed state, which causes high-speed erosion of the medium.

2. Different structure
Motorized globe valve is more complex in structure and larger in height than the globe valve. From the perspective of appearance, the gate valve is shorter and taller than the globe valve, especially the open stem gate valve requires a higher height space, which is limited when the installation space is limited. Pay attention to the following selection.
3. Different flow resistance
When the gate valve is fully opened, the entire flow path is straight through. At this time, the pressure loss of the medium operation is minimal. Compared with the globe valve, its main advantage is that the fluid flow resistance is small. The flow resistance coefficient of the ordinary gate valve is about 0.08~0.12, while the ordinary The resistance coefficient of the globe valve is about 3.5~4.5. Opening and closing force is small. The gate valve is generally suitable for working conditions that do not require frequent opening and closing, and keep the gate fully open or fully closed. It is not suitable for regulation and throttling.
The flow resistance of the globe valve during the entire stroke is very large, the unbalanced force is large, and the required driving force or torque is correspondingly much larger. But it is very suitable for the regulation and throttling of fluid. For high-speed flowing medium, the gate can cause vibration of the valve when it is partially opened, and the vibration may damage the sealing surface of the gate and the valve seat. Throttling will cause the gate to be eroded by the medium.
4.Different itinerary
The stroke of the gate valve is greater than that of the globe valve.
5. Different directions
During the installation of the shut-off valve, the medium can enter from below the spool and from above. The advantage of the medium entering from below the spool is that the packing is not under pressure when the valve is closed, which can extend the service life of the packing and can be used to replace the packing when the pipeline in front of the valve is under pressure. The disadvantage of medium entering from below the spool is that the driving torque of the valve is relatively large, which is about 1.05~1.08 times of entering above, the axial force on the valve stem is large, and the valve stem is easy to bend. For this reason, the medium entering method from below is generally only applicable to small-diameter shut-off valves (below DN50). For the shut-off valves above DN200, the medium inflow method is selected from above.
The electric shut-off valve generally adopts the way that the medium enters from above. The shortcomings of the medium entering from above are just opposite to the way of entering from below. The flow direction of the gate valve is the same for both sides.
Compared with the gate valve, the advantage is that the structure is simple, the sealing performance is good, and the manufacturing and maintenance are convenient; the disadvantage is that the liquid resistance is large, and the opening and closing forces are large.
6. Different maintenance procedures
The maintenance of the gate valve is not suitable for on-site pipelines, and most seats and discs of globe valves can be replaced online without removing the entire valve from the pipeline. This is the case where the valve and pipeline are welded together. Is very suitable. Of course, the difference between the gate valve and the globe valve is not limited to these types. We must distinguish their similarities and differences in selection and use to avoid errors.
The application range of globe valves and gate valves is determined according to their characteristics. In smaller channels, when better shut-off tightness is required, shut-off valves are mostly used; in steam pipes and large-diameter water supply pipes, gate valves are used because fluid resistance is generally required to be small.

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