The difference between gate valve and globe valve

The gate valve can be closed tightly according to the medium pressure, thus achieving no leakage. When the valve is opened and closed, the sealing surfaces of the disc and seat are always in contact and rub against each other, so the sealing surfaces are prone to wear. When the gate valve is about to close, the pressure difference between the upstream pressure and the downstream pressure is very large, which will make the sealing surface wear more seriously.

Globe valve, also known as cut-off valve, is the most widely used valve. The reason why it is popular is that the friction between the sealing surfaces is small during the opening and closing process, it is more durable, the opening height is not large, it is easy to manufacture, and it is easy to maintain. Convenient, not only for medium and low pressure, but also for high pressure. The closing principle of the globe valve is that relying on the pressure of the valve stem, the sealing surface of the disc and the sealing surface of the valve seat are closely fitted to prevent the flow of the medium.

The valve plays an important role in cutting off and throttling the medium in the pipeline where it is located. As an extremely important cut-off valve, the globe valve is sealed by applying torque to the valve stem, and the valve stem moves upward in the axial direction. The disc applies pressure to make the sealing surface of the disc and the sealing surface of the valve seat closely fit, preventing the medium from leaking along the gap between the sealing surfaces.

1. Different structural characteristics: the disc of the gate valve is a gate, the shape is relatively simple, and the casting process is better; while the structure of the globe valve is more complex, with spherical, tapered and flat valve cores, which are pressed down to the valve seat to seal .

2. Different usage conditions: the external force required for opening and closing the gate valve is small, the fluid resistance is small, and the flow direction of the medium is not restricted; the globe valve has a large flow resistance due to its structural characteristics , and it is always laborious during the opening and closing process. When fully open, the sealing surface of the gate valve is less eroded by the working medium than the globe valve.

3. Different sealing performance: The sealing performance of the gate valve is poor, and the globe valve has the characteristics of good one-way sealing effect, so it is also useful in the case of preventing the reverse flow of the working medium.

4. The working principles are different: the work of the globe valve is a rising stem type, and the handwheel rotates and rises together with the valve stem; the gate valve works by rotating the handwheel, and the valve stem moves upward.

5. Different installation methods: when the globe valve is installed, the medium can enter from below and above the spool, while the flow direction of the gate valve has the same effect from below and above. The gate valve has no requirement on the direction of import and export, and the globe valve has specified inlet and outlet.

6. The flow and function are different: the gate valve requires full opening, and the globe valve does not require full opening. Globe valves are generally used for pressure flow control, and gate valves are used for isolation.

Zhejiang Shunlin Valve Co., Ltd. is a professional valve manufacturer, if you are interested, please visit our official website.