Compared with the gate valve, the globe valve has the advantages of simple structure, good sealing performance and convenient manufacturing and maintenance; The gate valve and the globe valve are full-open and fully-closed valves.
The disadvantage of globe valve is that the fluid resistance is larger than gate valve, and the opening and closing forces are larger too.The structural feature of the gate valve is that it has a sealing surface formed by two sealing discs, and the valve flap is inserted into the valve seat like a gate. When the working fluid flows through the gate valve, the flow direction is constant, so the flow resistance is small; the opening and closing direction of the valve flap is perpendicular to the flow direction of the medium, so the opening and closing force is small. When the gate valve is fully open, the working fluid does not directly flush the sealing surface of the valve, so the valve line is not easily damaged. The gate valve is only suitable for full or full closing and is not suitable for adjustment.
The main difference between globe valve and gate valve is:
The globe valve structure is that the hand wheel rotates together with the valve stem to perform the opening and closing motion, and the gate valve structure is a rotating hand wheel, and the valve stem performs the lifting movement.
2. Different flow's requirement
The gate valve is required to be fully open or fully closed, and the globe valve is not required.
3. Flow direction requirements are different
The globe valve has a flow direction requirement, and the gate valve does not have an inlet and outlet end requirement.
4. Different sealing
The sealing surface of the gate valve is a small trapezoidal side, and the valve core is detached, which is equivalent to closing the valve. The gate valve is sealed by the side of the valve core, and the sealing effect is not as good as the globe valve. The valve core will not fall off like the globe valve when the valve station is closed.
The globe valve is one of most widely used valves. Due to the small friction between the sealing surfaces during the opening and closing process, it is durable, the opening height is not high, the production is simple, and the maintenance is convenient. It is not only suitable for medium and low pressure, but also suitable for high pressure. If working with high pressure condition,the valve type suggestion is gate valve or ball valve or other type valve with same functions.The gate valve is one of the common valves. The opening and closing part of the gate valve is called the gate. The gate could be up and down. It is perpendicular to the fluid direction. The gate valve can only be fully open and fully closed, and cannot be used for regulation and throttling.
The application range of the globe valve and gate valve is determined according to its characteristics. In smaller passages, globe valves are often used when better globe sealing is required. In steam pipes and large-diameter water supply pipes, gate valves are used because fluid resistance is generally required to be small.