Salvimar Predator maintenance

[tromic]

This is from Spanish forum:

 

[Breezy123]

Wow thank you! This is incredibly helpful! My spanish is rusty but he says something in the beginning about hi/lo power, “if load spear at low power never switch to hi” i think is what he said, what is the reasoning behind this? His custom tools are pretty sweet, i need To make one of those cutaway screw drivers and t handle tail cap removers.

 

[popgun pete]

On these Salvimar guns the use of the low power setting for loading means you utilize the easy loading or progressive loading feature of the gun. Once the gun is cocked the selector lever can be set to either high power or low power. If you carry out a low power shot and leave the selector setting at low power then you don’t release the air in the main tank that was compressed during loading and then only have to recompress what was used for the actual shot for the next reload. On the other hand if you flip the selector lever to high power after a low power shot that pressurized air is lost and the gun is back to even pressure throughout its inner chambers. Unfortunately due to the reversed gate positions and a different upstream valve used in the Salvimar guns a lower pressure in the inner barrel to that in the main tank makes it virtually impossible to budge the selector lever from low to high as the higher pressure in the main tank will hold the valve shut because it is operating an upstream valve. Most other pneumatic speargun brands use downstream valves and they don’t have this problem. If the power selector will not budge then the cure is to add more air to the gun with the hand pump and once the pressure equalizes throughout the upstream valve will open with a slight push on the selector. If you just reload the gun after the low power shot this has the same effect.

 

[popgun pete]

More on high or low power operation here: https://forums.deeperblue.com/threads/pneumatic-speargun-compression-ratio.86054/page-2#post-981221

 

[tromic]

Salvimar disassembly and maintenance:



Assembly Salvimar Predathor 115 Integral Video:

 

[tromic]

The use of power regulator - loading tips.



This is a quote from Italian forum:
"The important thing is that if you shoot at minimum you load at minimum. You must not move at maximum with the rifle "fired" at minimum.
If you shoot at minimum, before reloading the rod, you CANNOT move the variator lever to maximum, otherwise you will damage it. You must first recharge the rod in minimum and, if you want, you can then move the lever to the MAX position. When you finish the shot, it is always better to shoot with the variator at maximum."

 

[popgun pete]

Which is what I said in post #3. Another gun with an upstream valve is the Mares Titan mid-handle series, they have the same problem.

 

[tromic]

Which is what I said in post #3. Another gun with an upstream valve is the Mares Titan mid-handle series, they have the same problem.

I also see an advantage of this design. The choking action at full power is much lower because there are four holes for air passage.

 

[popgun pete]

I also see an advantage of this design. The choking action at full power is much lower because there are four holes for air passage.
View attachment 59450

I commented on this here.

https://forums.deeperblue.com/threads/salvimar-vent-air-plus.96856/#post-901055

The small strut that bifurcates each hole is to prevent the flat seal face extruding down the hole by offering some support, so there are really only two holes. That upstream valve acts as both the gun's "easy loading" non-return valve and the power regulator valve and although I have never had it happen the rubber seal could detach from the curved plastic backing plate that supports it. Forcing the valve open against a pressure imbalance in the two chambers could bust that curved plastic backing plate or drive the shoulder step in the metal rod that it sits on right through it, so the design has its risks.

 

[tromic]

I commented on this here.

https://forums.deeperblue.com/threads/salvimar-vent-air-plus.96856/#post-901055

The small strut that bifurcates each hole is to prevent the flat seal face extruding down the hole by offering some support, so there are really only two holes. That upstream valve acts as both the gun's "easy loading" non-return valve and the power regulator valve and although I have never had it happen the rubber seal could detach from the curved plastic backing plate that supports it. Forcing the valve open against a pressure imbalance in the two chambers could bust that curved plastic backing plate or drive the shoulder step in the metal rod that it sits on right through it, so the design has its risks.

One should read the user manual before using his new toy and must be familiar with it...

 

[tromic]

https://cache.tradeinn.com/images/pdf/manuales/eng_salvimar_manu_pneumatic_spearguns.pdf