Why does the refrigeration globe valve have to be low in and out of high?
Globe valve, also known as door shutoff valve, belongs to forced sealing valve, is a kind of truncated valve. According to the connection mode, it can be divided into three kinds: flange connection, wire buckle connection and welded connection.
The flow direction of the globe valve is top-down, so the installation is directional.
This type of cut-off valve is ideal for cutting off or regulating and throttling. Because the stem opening or closing stroke of this kind of valve is relatively short, and has a very reliable cutting function, and because the change of seat pass is proportional to the stroke of disc, it is very suitable for the adjustment of flow rate.
The globe valve is designed to be low in and high in order to reduce flow resistance and save effort when opening the valve. At the same time, when the valve is closed, the gasket between the valve shell and the valve cover and the packing around the valve stem are not subjected to force, and the service life can be prolonged and the probability of leakage can be reduced without being subjected to the action of medium pressure and temperature for a long time. In addition, the packing can be replaced or added when the valve is closed, which is convenient for maintenance.
In general, the globe valve is low in and out, but there are also some special cases in which the globe valve is high in and out:
1. The high pressure globe valve with diameter greater than 100mm.
2. Two stop valves in series on the bypass pipe, and the second globe valve requires "high in and low".
3. Vent globe valve.
4. Electromagnetic speed break valve.