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hydraulic press decompression control
When the directional control valve (1) is activated to extend the cylinder, fluid enters the cylinder (5) via the check valve (2). Pressurization of the cylinder during extension closes the pressure reducing valve (3), so that when the directional control valve (1) is activated to retract the cylinder (5) the compressed volume of fluid is metered across the orifice (4). When pressure upstream of the orifice (4) falls below the setting of the pressure reducing valve (3) the remaining fluid in the cylinder flows back to tank across the pressure reducing valve (3). The sequence valve (6) prevents pressurization of the rod side of the cylinder before the piston side has decompressed and the pressure reducing valve (3) has opened.
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