Routine 16 : LPR adjustment & optimization
LPR adjustment
The low-pressure regulator controls the pneumatic cycle of the Angel and is located in
the left-hand chamber at the front of the Angel body. The pressure needs to be at
82 PSI (5.7 BAR) output at a pressure of 350 PSI at the second stage regulator.
LPR adjustment is achieved by the removal of shims. Each shim equals approximately
5 PSI/0.35 BAR. We recommend the use of the optional service tools and lubrication of parts
with Love Juice Extreme Grease only.
· Ensure the Angel is degassed and switched off.
· Remove the pressure gauge adaptor and insert a 2.5mm screw or the piston
extracting tool (optional extra) into the brass piston and withdraw slowly.
· Remove the four piston springs.
· Add or subtract shims as necessary, note the number of shims may vary from
the diagram shown (maximum 20).
· Replace piston springs in correct order onto the piston.
· Re-insert the piston ensuring that it is located correctly.
· Insert the optional pressure gauge adaptor into the hole that the end cap was
removed from.
· Re-Gas the Angel and switch the Angel to live.
· Ensure a barrel blocking device is fitted to the Angel
· Ensure the hopper is removed from the Angel
· Ensure that there are no paintballs in the Angel
· Fire 6 shots with no paintballs present to stabilize the LPR pressure.
· The Angel can hold a small residual charge of gas, typically 2 shots, with the
first stage regulator removed. Always discharge the marker in a safe direction to
relieve this residual gas pressure.
· Ensure the Angel is degassed and switched off.
(repeat if necessary)
Volumizer Functionality
The Angel has been designed to accept volumizers that attached to the front of the
Angel. Attachment of volumizers will allow the working pressure of the Angel to be
reduced to suit specific customer requirements. The Angel volumizer come in 3 sizes
that will reduce the working by approximately the values shown in below.
· Each volumizer will change the operating pressure of the Angel as follows:
– approx 325psi (no volumizer)
– approx 275psi (shortest volumizer)
– approx 225psi (medium volumizer)
– approx 175psi (longest volumizer)
With the LPR piston removed, note the 4 springs. It is imperative that they are configured this way in the LPR for functionality. Note also the location of the shims in regards to the spring stack. LPR pressures will vary from marker with a 4 shim configuration.
With the LPR end cap removed, you can insert the LPR extraction tool to remove the top piston, exposing the spring stack and shims. It might be easier to remove the volumizer before this process but it isn't necessary as the LPR piston can still be removed using the tool with the volumizer present.
Insert the LPR extraction tool as shown and applying some light force, turn the tool clockwise. You're "threading" the tool into the piston for removal. The tool will cease turning when the tool is thread properly and you can then remove the piston and spring stack.
This photo shows the piston with spring stack as connected to the extraction tool. Notice the way the washers sit, there are 4 present. Ensure the piston is clean and a light coat of lubricant is applied on the o-ring prior to reinsertion.
Each shim is valued at 5.0psi and the LPR can be function with as little as 0 shims or as many as 20 shims. The amount of shims will directly indicate the LPR pressure, the more shims will result in a higher LPR.
The LPR gauge as found in the toolkit. The gauge is currently reading 55psi, with approximately 200psi input and 4 shims. The LPR gauge should snap back to the same mark each time and not creap between cycles.
The mini-reg flash tank gauge. The gauge currently reads 200-210psi going into the marker from a 450psi input preset. This pressure amount can be increased (or decreased) by the velocity screw on the mini-reg. This range is deemed acceptable based on the largest volumizer and a 285fps chronograph reading. When setting the LPR, you want the gauge to display between 300-350psi input.
The LPR pressure must be checked with the volumizer installed over the exhaust plug to simulate operating conditions. The largest volumizer (5) will result in a lower operating pressure and thus lower lpr (50-60psi), the medium volumizer (4) will result in a mid-range operating pressure and a medium lpr (55-65), the smallest volumizer (3) will result in higher-range lpr (65-75) and no volumizer will have the LPR operate at 80-85psi.
Depending on the volumizer that is installed on your marker, the LPR and dwell can be changed accordingly. A low LPR (50-60psi) means you'd want to run a higher dwell (15+) and vice-versa. Various settings will work better on different markers. The low LPR/high dwell will result in more air consumption per shot though, however it will provide a greater volume of air hitting the ball and thus further "cushioning" the shot.
Watch video of LPR testing