Flow rate is varied by a handwheel with a threaded stem and a tapered nose that passes through a fixed orifice. A locknut is provided on the threaded stem. The valve is installed in a hydraulic pressure line to provide variable flow in one direction whilst allowing free flow in the opposite direction, for instance limiting the maximum speed of a cylinder movement. When the required speed is set, the valve can be locked in position if required. If used in a test rig the valve can apply variable and progressive back pressure to the test piece.
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1/4" BSP, 3/8" BSP, 1/2" BSP, 3/4" BSP, 1" BSP