High-efficiency circuit operates 100-ton trim pressFigure 23-1 is a schematic circuit diagram for a 100-ton trim press, shown at rest with the pump running. This press has a 24-in. total stroke with a 1.0-in. high-tonnage stroke. It completes a dry cycle in about 10 seconds.Pump PUMP01 is rated at 13 gpm. Its compensator is set at approximately 3000 psi. Output from the pump flows through flow meter FM01 to directional valve DV01, which has ports "P," "B," and "T" connected in center position. From there, fluid flows to back pressure check valve CK02 and 3-micron filter RF01. Pressure at gauge PG01 holds between 75 and 100 psi with the press at rest, providing ample pilot pressure for directional valve DV01.
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