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What is the difference between electric gate valve and electric globe valve

2018-07-31

What is the difference between electric gate valve and electric globe valve? Electric globe valve refers to the valve that closes the valve along the center line of the valve seat. Electric gate valve is an opening and closing valve plate. The direction of movement of the plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened or fully closed to achieve no leakage effect. Gate valves are shorter and taller than globe valves in appearance. Here I briefly introduce the difference between globe valve and gate valve.

1. Distinguish from the structure:

The length of the gate valve is shorter than the cut-off valve, and the height is higher than the cut-off valve. The installation of the famous stem gate valve requires attention to height. This in the case of limited installation space to pay attention to the selected model, the gate valve can rely on the medium pressure tightly closed with the sealing surface. So as to achieve the effect of not leaking. When the opening and closing of the valve core and valve seat sealing surface always contact and friction with each other, the gate valve is close to close, the pipeline before and after the pressure difference is very large, easy to seriously wear the sealing surface.

2. Different sealing surfaces

Gate valve in the opening and closing of the valve core and valve seat sealing surface always contact and friction with each other, so the sealing surface is easy to wear, especially in the valve is close to close, before and after the valve core pressure difference is very large, the sealing surface wear is more serious.

Once the valve flap of the globe valve is in an open state, his valve seat and the sealing surface of the valve flap are not in contact, so his sealing surface is less mechanically worn, but if the medium contains solid particles, it is easy to damage the sealing surface.

Gate valve sealing surface has a certain self-sealing ability, its valve core by medium pressure tightly contact with the valve seat sealing surface, to achieve tight leakage. In the structure, certain measures are used to prevent the valve core from being stuck.

3, from the installation

The flow of the gate valve is the same in both directions. There are two ways to install the stop valve. A medium can enter from the bottom of the valve core. When the valve is closed, the packing is not under pressure to extend the service life of the packing, and the packing can be replaced under pressure in the pipeline. However, the driving torque of the valve is large, which is about twice the upper flow. The valve stem is subject to large axial force and is easy to bend.

4. The journey is different

The stroke of the gate valve is larger than that of the stop valve.

5. Different maintenance processes

The maintenance of gate valves is not suitable for on-site pipelines, and most of the valve seats and discs of stop valves can be replaced online.

The above contents hope to help everyone.

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