*VALLOUREC: SUBSCRIPTION PERIOD 11 APRIL '16 TO 22 APRIL
*VALLOUREC: LAUNCH OF RIGHTS ISSUE FOR C. €480 MLN
*VALLOUREC: RIGHTS OFFER 8 NEW SHRS FOR 5 EXISTING SHRS
*VALLOUREC: SUBSCRIPTION PRICE: €2.21 PER NEW SHR
*VALLOUREC: REMAINING PART UNDERWRITTEN BY SYNDICATE OF BANKS
*VALLOUREC: ROTHSCHILD & CIE IS FINL ADVISOR