Gate valves flow in both directions with the same effect. Installation does not require inlet or outlet direction. Media can flow in both directions. The globe valve should be installed strictly in accordance with the direction marked by the arrow of the valve body. There is also a clear regulation on the inlet and outlet direction of the globe valve. China's valve "three to give" rules that the flow direction of the globe valve should be top-down.

Globe valves are low into the high, from the outside view there is a significant pipeline is not a phase level. Gate valve port is on a level line. Gate valves have greater travel than globe valves.

From the point of view of flow resistance when fully open gate valve flow resistance is small, load stop valve flow resistance is large. The flow resistance coefficient of ordinary gate valve is about 0.08~0.12, small opening and closing force, medium can flow in two directions. The flow resistance of ordinary globe valves is 3-5 times that of gate valves (public number: pump house). The valve core of the globe valve does not contact the sealing surface until it is completely closed, so the wear of the sealing surface is very small. As the flow main force needs to add actuator to the globe valve, attention should be paid to the adjustment of torque control mechanism.

Globe valve in the installation of two ways, one is the medium can enter from the bottom of the spool, the advantage is that when the valve is closed the root does not suffer pressure, can extend the service life of the root, and can be in front of the valve under the pressure of the pipeline, to replace the work of the root; Disadvantages are that the valve drive torque is large, is the upper flow into about 1 times, the axial force by the valve stem is large, the valve stem is easy to bend. Tianjin gate valves

Therefore, this method is generally only applicable to small-diameter globe valves (below DN50), and the globe valves above DN200 choose the way of medium inflow from the top. (Electric globe valves generally use the medium from above to enter the way.) The disadvantage of the way the medium enters from above is the opposite of the way it enters from below.