DIFFERENCE BETWEEN GATE VALVES AND GLOBE VALVES

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. However, the globe valve and the gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline, so many friends who have little contact with the valve will confuse the two. In fact, if you look closely, the difference between a globe valve and a gate valve is quite big.

　　structurally

　　When the installation space is limited, attention should be paid to the selection. 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 the valve seat sealing surface 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, the gate valve is divided into the open rod and the dark rod. 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.

　　In addition, the gate valve only has two states of fully open or fully closed, the gate opening and closing stroke is large, and the opening and closing time is long. The movement stroke of the valve plate of the globe valve is much smaller, and the valve plate of the globe valve can stop at a certain place during the movement for flow regulation. The gate valve can only be used for truncation and has no other functions.