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Turbo valve

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What is the valve on the underside of the exhaust side of my 300tdi turbo? It looks as if it might be a butterfly valve. Looking at equivalent units on 'google images', it is operated by an adjustable metal linkage that comes from a valve (Diaphram??) that has a rubber pipe from the inlet side of the turbo.

Mine is siezed but the engine still seems to work perfectly well. Any help gratefully received.

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What does it do? I have WD40'd it and will get pliers to some time but is it important?

Yes, it is important for your turbo,

the reason why it's fitted ------------

A wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharged engine system. Diversion of exhaust gases regulates the turbine speed, which in turn regulates the rotating speed of the compressor. The primary function of the wastegate is to regulate the maximum boost pressure in turbocharger systems, to protect the engine and the turbocharger. One advantage of installing a remote mount wastegate to a free-float (or non-WG) turbo includes allowance for a smaller A/R turbine housing, resulting in less lag time before the turbo begins to spool and create boost.[1]

borrowed from ---- http://en.wikipedia.org/wiki/Wastegate

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