10电磁换向阀概论.ppt

* Series I Solenoid Direct actuated valve Spool Style Valve 12 gpm capacity 5in3/ min leakage 50 msec response time NO/NC option Manual override available also Push style operation * Series 1 Solenoid operated poppet valve 10 gpm capacity Low leakage [ less than 10 drops/min @ 5000 psi ] 50 msec response time NO/NC options Due to their low leakage characteristics, these valves can be used in load holding applications. * Solenoid Operated spool valve 2pos-3 way 12 gpm 5 in3/min @ 3000 psi 50ms response time 5 different spool configurations 2 of which have a closed transition Closed transition between positions have 10 gpm capacity * Series 1 Soft Shift Solenoid actuator Orifice in solenoid armature dampens armature shift when coil is energized and de-energized Because of the wetted armature design – when the armature moves it displaces oil therefore we can meter this through an orifice thus slowing it down and creating a soft shift – fluid viscosity tends to have an effect on response time Helps soften the hydraulic shock when shifting a valve or unloading a mainstage valve * Left Graph – std solenoid stepped response 50 msec response time Right Graph – soft shift solenoid sloped response extended response time of 150-300msec * Series 1 solenoid with P-series valve t-8a Cavity NO/NC configurations ? gpm capacity Less than 10 drops/min leakage Interchangeable w/ existing P-series valves providing that there is enough external clearance * T-8A controlling a mainstage valve complete with solenoid operated pilot stage and manual override control keep in mind that the pilot stage and main stage have different installation torques therefore they are assembled and disassembled in a sequence. just as an example a daal has 25/30 lb-ft installation torque and a series 3 LO*D-8 has 150/160 lb-ft of install torque * DWDA valve 7.5 gpm Capacity Less than 10 drops/min @ 5000 psi 50ms response time * 50ms response time Transitional effects shown in symbol are