astra egr valve problem?

I have a 2010 Vauxhall Astra 1.7cdti ecoflex. When i turn the engine off, the egr valve is clicking 4 or 5 times, its quite loud u can hear it every time. Was wondering if any1 knows what it could be and how to sort it. Ive been debating to take it off my self and clean it. Ive been told the valve itself or whatever its called isn't closing 1st time. So not sure what to do. Can any1 help please.