Help please MegaFlow Heatrae Sadia unvented system

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Really appreciate some help please.
I have recently moved into a new house and not familiar with my heating hot water system.

Can someone please tell me what the red wheeled gate valve is for? I recently tried to isolate the hot water and did try to close this valve and I believe it was shut. When opened the system lost its pressure. I have closed this valve and pressurised the system back to 1 bar. I have since realised the isolation for the HW is the black plastic valve.
The hot water and heating system appears to be working ok now, my concerns really are I cannot remember if the valve was shut tight or slightly cracked open.
I will attach some pictures of the pipework in my airing cupboard an hope someone can identify
1. What the valve is for
2. Should it be open or closed
Many thanks in advance!!
 
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Joined
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Its a bypass and should be slightly open so that if your motorised valves are shut heated water still has a path to flow through
 

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