The three-position four-way reversing valve consists of a two-position four-way reversing valve and a rest position. The three-position four-way reversing valve has a variety of neutral functions (as shown in the figure, the neutral function is M-type). In the working position shown in the figure, the oil inlet P is connected with the working port B, and the working port A is connected with the oil return port T.. The three-position four-way reversing valve can be a slide valve structure or an on-off valve structure.
Extended data
Reversing valve, also known as Chris valve, is a kind of valve with multi-directional adjustable channel, which can change the flow direction of fluid in time. It can be divided into manual reversing valve, electromagnetic reversing valve and electro-hydraulic reversing valve.
When working, the drive shaft is driven by the drive transmission mechanism outside the valve, and the valve plate is started by the rocker arm, so that the working fluid sometimes leads from the left inlet to the lower outlet of the valve, and sometimes changes from the right inlet to the lower outlet, thus achieving the purpose of periodically changing the flow direction.
This shift valve is widely used in petroleum and chemical production, most commonly used in synthetic ammonia and gas production systems. In addition, the reversing valve can also be made into disc structure, which is mostly used in small flow occasions. When working, the flow direction of working fluid can be changed as long as the handwheel is rotated by the disc.
Baidu encyclopedia-reversing valve