Pressure controlled directional system

Abstract

Abstract A PRESSURE CONTROLLED DIRECTIONAL SYSTEM FOR A HYDRAULIC PRESS MOTOR CHARACTERIZED IN THE PROVISION OF A MOTOR REVERSING VALVE ASSEMBLY INCLUDING TWO SUPPLY VALVES AND TWO RETURN VALVES WHICH ARE CLOSED WHEN PILOT PRESSURE IS CONDUCTED THERETO AND WHICH ARE OPENED BY FLUID PRESSURE WHEN PILOT PRESSURE IS VENTED THEREFROM, AND A FOURWAY PILOT VALVE WHICH SELECTIVELY CONDUCTS PILOT PRESSURE TO SAID VALVES AND VENTS PILOT PRESSURE THEREFROM THUS TO ACTUATE THE PRESS MOTOR IN OPPOSITE DIRECTIONS. THE PILOT VALVE IS CHARACTERIZED IN THAT IT HAS A NEUTRAL POSITION WHEREAT ALL OF SAID VALVES HAVE PILOT PRESSURE VENTED THEREFROM SO THAT THEY MAY OPEN TO CONDUCT SYSTEM PRESSURE TO THE RESERVOIR AND WHEREAT THE PILOT PRESSURE INLET PORT THEREOF IS BLOCKED SO THAT PILOT PRESSURE STANDS AT THE PILOT VALVE PREPARATORY TO CONDUCTION TO SELECTED SUPPLY AND RETURN VALVES. THE SYSTEM HEREIN IS FURTHER CHARACTERACTERIZED IN THAT THE SUPPLY AND RETURN VALVES ARE SPRINGBIASED AGAINST THE DIRECTION OF FLOW OF FLUID THERETHROUGH AND IN THAT IT HAS A DUAL PUMP ARRANGEMENT TO PROVIDE FOR RAPID ACTUATION OF THE PRESS MOTOR IN EITHER DIRECTION BY THE CONJOINT FLOW OF FLUID FROM A HIGH PRESSURE-LOW VOLUME PUMP AND A LOW PRESSURE-HIGH VOLUME PUMP.

Inventors

• 👤 Raymond S Conabee
• 👤 Melville E Lawrence

Bibliographic Details