Z2FS type of dual / single way stacking throttle valves is used for controlling the main runoff of pioneering oil quantity at 1 - 2 oil passes, which is allowed to connect at the same time 2 oil pipes for a working oil cylinder. 2 symmetric single-way throttle valves control flux via reed to change the cross section of the internal flowing area, and at the other hand, upward to pass the one-way valve pass. Main runoff control is installed between direction and chassis. Control of pioneering runoff is installed between pioneering valve and main valve.

MK / MG type of throttle valves is directly installed in the pipeline, as it is the pipe type of one-way gate valve / throttle valve, which uses axial triangle groove structure to form throttle opening. There are 7 specifications and 2 kinds of connecting threads, which are used for controlling the implementing speed for element.