| 摘要 |
<p>PURPOSE:To reduce the manufacturing cost of converging control valve and to simplify the piping by coupling both circuitry systems of boom cylinder circuit and arm cylinder circuit through single converging control valve. CONSTITUTION:In the converging control valve, a spool S containing a piston is provided in a body formed with first port 59 communicating with a pump in one circuitry system and second port 60 communicating with a pump in the other circuitry system where esternal pilot pressure is applied onto the opposite ends of sad spool. It is constructed such that upon variation of the external pilot pressure, said spool can take tha neutral position for communicating to the first and second ports 59, 60, one position fr allowing communication only from the second port 60 to the first port 59 and the other position for communicating with both ports while providing restricting resistance.</p> |
