EPN Pump
Biach's "EPN" Series Electric/Hydraulic Pumping System is a major step forward in improving tensioner performance through the pumping unit. This new unit offers greatly increased hydraulic flow rate along with improved accuracy through a closed loop pressure circuit. The result is faster tensioner operation and more repeatable loading from series to series of studs leading to "trim pass" reduction.
How The Pump Works:
Stage 1: An electric motor drives a low pressure pump. This fills the system at a high flow and low pressure. When pressure reaches approximately 3,000 psi, the system shifts to pressurizing a booster which raises it to the target pressure.
Stage 2: The low pressure pump has a compensator on it that controls the minimum and maximum pressure of the low pressure pump as well as a pressure control line. An electronically controlled pressure reducing valve modulates this control pressure and therefore controls the pressure of the low pressure pump. This pressure reducing valve is controlled by the control system.
Stage 3: Feedback of the system pressure through a calibrated pressure transducer determines the control signal to the pressure reducing valve connected to the compensator. This feedback enables the high pressure to be maintained accurately. Directional valves redirect the flow to the auxiliary systems as necessary.
Biach Industries, Inc., 75 Chestnut Street, P O Box 280, Cranford, NJ 07016. Tel: 908-276-3110; Fax: 908-276-0815.