German DrBreit valves DrBreit models DrBreit prices

DrBreit valves are directional control valves with more than two flow patterns and more than two oil ports. They are valves that realize the communication, cutoff, and reversal of hydraulic oil flow, as well as pressure unloading and sequential action control. These are directional control valves that rely on the relative motion between the spool and the valve body. There are two types: rotary valve type and slide valve type. They are classified into two-position, three-position, etc., according to the number of working positions where the spool stays within the valve body; they are classified into two-way, three-way, four-way, and six-way, etc., according to the number of oil circuits connected to the valve body. The methods for operating the spool movement include manual, mechanical, electric, hydraulic, and electro-hydraulic types.

DrBreit valve working principle

The six-way reversing valve is mainly composed of the valve body, sealing components, cam, valve stem, handle, and valve cover (Figure 1). The valve is driven by the handle, which rotates the valve stem and cam. The cam has the functions of positioning drive and locking the opening and closing of the sealing components. When the handle is rotated counterclockwise, the two sets of sealing components close the two lower channels under the action of the cam, while the two upper channels are connected to the inlet of the piping device. Conversely, the two upper channels are closed, and the two lower channels are connected to the inlet of the piping device, achieving reversal without stopping.

DrBreit valve advantages

Accurate action, high degree of automation, and stable and reliable operation, but it requires additional drive and cooling systems, resulting in a relatively complex structure; the disc-type structure is simpler and is mostly used in production processes with smaller flow rates. In industries such as petroleum, chemical, mining, and metallurgy, the six-way reversing valve is an important fluid reversal equipment. This valve is installed in the pipelines of thin-oil lubrication systems that transport lubricating oil. By changing the relative position of the sealing components within the valve body, the various channels of the valve body are connected or disconnected, thereby controlling the reversal and start-stop of the fluid.

DrBreit valve functions and applications

Reversing valves, also known as Christie valves, are a type of valve with multi-directional adjustable channels that can change the fluid flow direction in a timely manner. They can be divided into manual reversing valves, solenoid reversing valves, electro-hydraulic reversing valves, etc. During operation, the drive shaft is rotated via the external drive transmission mechanism, which drives the rocker arm to activate the valve plate. This allows the working fluid to flow from the left inlet to the lower outlet of the valve, or from the right inlet to the lower outlet, achieving the purpose of periodic flow direction change. This type of reversing valve is widely used in petroleum and chemical production, and is most commonly used in synthetic ammonia gas making systems. In addition, reversing valves can also be made with a disc-type structure, mostly used for occasions with smaller flow rates. During operation, only the handwheel needs to be turned to change the flow direction of the working fluid through the valve disc.

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