PNEUMOHYDRAULIC PUMPING STATION

摘要

PNEUMOHYDRAULIC PUMPING STATION The herein-proposed pneumohydraulic pumping station comprises two-position three-way control directional valves featuring two-end differential air piloting and adapted to shfit two-position power directional valves which are intended to control the travel of the sliding member of one of the intensifiers in accordance with the travel of the sliding member of the other intensifier 1. One control chamber of each of the control directional valves is periodically communicated with the source (B) of compressed gas or with the atmosphere through the air chamber of the respective pneumohydraulic intensifier . The inlet of each of the control directional valves is communicated with the source (B) of compressed gas, whereas the outlet of one of the control directional valves adapted to shift the power directional valve of one of the intensifiers is so connected to the control chamber of the power directional valve of the other intensifier as to alternately communicate the control chamber of the power directional valve of the other intensifier with the source (B) of compressed gas and with the atmosphere. The pumping station incorporates also air-flow dividing valves one for each of the control directional valves , The outlet of each of the air-flow dividing valves is connected to the other control chamber of the control directional valve so as to switch over the inlet and the outlet thereof depending upon whether a pressure is effective in the air chambers of the respective intensifier . Fig. 1.