SECUMS Interlocks BV is a leading manufacturer of trapped key interlocks, Interlock systems and safety interlock switches (safety gate switch interlocks) to protect people, machine and equipment from harm. The SECULOK series of Interlocks covers the total area of machine and equipment safety-guarding, and the SECULOK IVL series of valve interlocks do secure any predetermined operating sequence of valves in any industry. SECULOK Key operated Pneumatic and Hyraulic valveinterlocks as well as ATEX safety switch interlocks are available to safeguard any equipment in the Bulk and Powder Industry.