The PPS LT valve is quieter but more importantly will be more efficient and actually allow you to run a lighter mainspring.
The AKALMP valve allows you to run lower input pressures, but that does not mean it uses lighter springs. The PPS would be my preferred valve even if it cost the same as an AKALMP valve. Both are upgrades to the CCM valve performance wise. Not to say that CCM valves are anything but nice valves.
Originally Posted by Leo Tolstoy
It is amazing how complete is the delusion that beauty is goodness.