base-valve-exploded

This exploded view shows the BV: tap and shims set out in order with the nut on the top right (then note the tiny float spring) then the first shim which is actually a thick metal washer called the 'check plate', then a piston, then many large 24mm shims before (in the lower row) the shims then get smaller, finishing with the dark and small 9mm@.3 thick shim.

This exploded view shows the BV: tap and shims set out in order with the nut on the top right (then note the tiny float spring) then the first shim which is actually a thick metal washer called the ‘check plate’, then a piston, then many large 24mm shims before (in the lower row) the shims then get smaller, finishing with the dark and small 9mm@.3 thick shim.