Why should the stop valve have low inlet and high outlet?

Why should the stop valve have low inlet and high outlet?

　　stop valve, also known as stop valve , is a forced-sealing valve, which is a kind of stop valve . According to the connection method, it is divided into three types: flange connection, thread connection, and welding connection.

　　 China’s valve “Sanhua” once stipulated that the flow direction of the stop valve should be selected from top to bottom, so there is a directionality when installing.

　　This type of shut-off shut-off valve valve is very suitable for blocking or regulating and throttling. Because the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable blocking function, and because the change of the valve seat port is directly proportional to the stroke of the valve disc, it is very suitable for flow regulation.

　　 The stop valve is designed for low inlet and high outlet, the purpose is to make the flow resistance small and save effort when opening the valve. When the valve is closed, the gasket between the valve casing and the valve cover and the packing around the valve stem are not stressed, and the effect of not being exposed to medium pressure and temperature for a long time can prolong the service life and reduce the probability of leakage. Otherwise, the packing can be replaced or added when the valve is closed, which is convenient for repairing.

Not all globe valves have low inlet and high outlet. Generally, it is difficult to close the valve when selecting low inlet and high outlet under large diameter and high pressure. The pressure is simple to deform and twists, which affects the safety and sealing of the valve; if the high inlet and the low position are selected, the diameter of the valve stem can be smaller, which will also save a little cost for the manufacturer and the user.