If my assumptions are correct...you will find the part you require at ISIS Fluid Control...part number 204052.
This part number is for a 1/2" BSP 316 stainless steel flow control valve with integrated check valve. The working pressure is 400 BAR...but I don't think 10 BAR will be a problem.
If my assumptions are wrong and you do need a pressure relief valve with a check valve...you will have to build one...if you are not in the U.K...?????