Rexroth SV / SL 4X series of pilot controlled check valve 
 Diameter :6-32mm 
 Pressure up to 31.5MPa 
 Flow to 550L/min 
 For backplane mounting surface according to DIN24340 Type, ISO5781 and CETOP-rp, 121H backplane 
 For the thread to understand 
 3, with or without unloading port 
 4, with or without the uninstall feature 
 5, with the uninstall feature of the model: for smooth operation (reduce the possibility of opening impact) 
 6, four opening pressure