German KUHNKE valves KUHNKE models KUHNKE prices

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

KUHNKE valve operating principle

The six-way reversing valve mainly consists of components such as the valve body, sealing assembly, 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 provides positioning drive and locks the opening and closing of the sealing assembly. 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 connect to the inlet of the piping device. Conversely, the two upper channels close, and the two lower channels connect to the inlet of the piping device, achieving reversal without stopping.

KUHNKE valve advantages

Accurate action, high degree of automation, stable and reliable operation, but requires additional drive and cooling systems, resulting in a more complex structure; disc-type structures are simpler and are 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 device. 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 fluid reversal and start/stop operations.

KUHNKE valve functions and applications

Reversing valves, also known as Christ valves, are a type of valve with multi-directional adjustable channels that can change fluid flow direction as needed. They can be divided into manual reversing valves, solenoid reversing valves, electro-hydraulic reversing valves, etc. During operation, the drive shaft outside the valve rotates via the external drive transmission mechanism, driving 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 periodic flow direction changes. This type of reversing valve is widely used in petroleum and chemical production, and is most commonly used in synthetic ammonia gas manufacturing systems. In addition, reversing valves can 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 via the valve disc.

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