bsa scorpion problem

[ukace1958]

hope someone can help , if I fill my single shot scorpion to anything over 100 bar it will not open knock valve , everything is working ok , just as pressure goes up the valve refuses to open

[Bigorro]

weak hammer spring...

[CuppaT]

Replace knock off valve.
They do have a limited lifespan and tend to get a radius of wear on them - my guess is that yours is probably worn to the point it is sticking.

Open her up and have a butchers

[gc93]

hi, first is your filling gauge reading/working as it should, if ok then the hammer spring broke/weak or hammer seizing up/stiff, all that can be looked at without emptying the res as its on the non pressure side of things, if ok then its go to be emptied of air. quite possible the valve stem at fault bent/stiff/deformed . if you feel confident and know what you are doing then that's the way I would go. if any doubts then get it looked at. hpa is a dangerous thing. atb gc...

[ukace1958]

having stripped it right down , seems like the knock of valve seems to be sticking, going to replace it and the hammer spring,
thanks for all your help

[CuppaT]

having stripped it right down , seems like the knock of valve seems to be sticking, going to replace it and the hammer spring,
thanks for all your help

There will be nothing wrong with the hammer spring mate. Knock off valves on BSA are a service part, they need replacing every now and then.

[ukace1958]

thanks will try valve first

[lensman57]

There will be nothing wrong with the hammer spring mate. Knock off valves on BSA are a service part, they need replacing every now and then.

A very apt description.

A.G