Globe valves, gate valves, butterfly valves, check valves and ball valves are all indispensable control components in various pipeline systems. Each valve is different in appearance, structure and even functional use. What are the specific differences? Let's find out together.
Structurally, attention should be paid to the selection when the installation space is limited. The gate valve can be tightly closed with the sealing surface by the medium pressure, so as to achieve the effect of no leakage. When opening and closing, the valve core and valve seat sealing surfaces are always in contact and rub against each other, so the sealing surface is easy to wear. When the gate valve is close to closing, the pressure difference between the front and rear of the pipeline is large, which makes the sealing surface wear more seriously. The structure of the gate valve will be more complicated than that of the globe valve. From the perspective of appearance, the gate valve is taller than the globe valve and the globe valve is longer than the gate valve under the same diameter. In addition, gate valves are divided into open rods and dark rods. The shut-off valve does not.
Working principle When the globe valve is opened and closed, it is of a rising valve stem type, that is to say, when the handwheel is turned, the handwheel will rotate and lift together with the valve stem. The gate valve rotates the handwheel to make the valve stem move up and down, and the position of the handwheel itself remains unchanged. Flow rates vary, gate valves require fully open or fully closed, and globe valves do not. Globe valves have specified inlet and outlet directions; gate valves do not have requirements for inlet and outlet directions.
