Valve manufacturers of the cut-off valve flow is a straight-through valve, its flow resistance is small, the general choice as cut-off and closure of the medium used valves. Downward closed valve (cut-off valve, plunger valve) because of its flow path winding, flow resistance than the rest of the valve is high, so less choice. A closed type valve is available for a place with high flow resistance. Master the flow of the valve generally choose easy to adjust the flow of the valve as master flow. A downward closed valve (such as a cut-off valve) is suitable for this purpose, as it is inversely proportional to the distance between the seat and the open part.
Wind-filled valves and flex-valve valves can also be used for diet control, but generally can only be unlimited valve caliber within the scope of practical, the gate valve is a disc-shaped gate for the circular valve to do crosscutting activities, it as long as it is on the verge of open position, the ability to better grasp the flow, it is generally not necessary to master the flow. Valve manufacturers of reversing shunt valves based on the demand for directional diversion, this valve can have three or more channels. Plug valves and ball valves are more practical for this means, therefore, the large all used for reversing the flow of valves are selected plug valve and ball valve of this type of valve. However, in some cases, the remaining types of valves, only two or more valves are properly connected to each other rise, can also be used for reversing diversion.