Adjusting your APEX Modular Regulator

The APEX Modular Regulator is supplied with the output pressure and stack number engraved on the regulator body. The position of the adjuster is marked with a laser engraved circle, so you know exactly where the regulator is set to and the pressure. We also engrave dots/markings to help you easily adjust the regulator, with no chance of markings or stickers coming off in use or during installation, giving you 100% confidence. The biggest issue when tuning is unknown regulator pressures, and working blind in this way requires a lot of trial and error, taking time and making tuning difficult. We prefer the easy way.
The APEX Regulator is supplied with a tool to hold the regulator body when adjusting it. Using the information in the table below, identify your stack number, check the marked setting on your adjuster, and you can see what adjustments you make will do to the output pressure. Holding the hex securely in the tool you can turn the adjuster with a 5mm Allen key, clockwise will reduce pressure, anticlockwise will increase the output pressure.
Stack Number | Working Pressure | Belleville Quantity, Thickness & Stack | Output Pressure of Regulator | ||||||||
Pressure (bar) with Adjuster touching Piston | 0.5T | 1T | 1.5T | 2T | 2.5T | 3T | 3.5T | 4T | |||
1 | 25-75 bar | 8x0.6mm )()()()( | 0 | 25 | 40 | 50 | 55 | 60 | 65 | 70 | 75 |
2 | 40-155 bar | 8x0.6mm ))(())(( | 0 | 40 | 70 | 105 | 130 | 155 | Open | Open | Open |
3 | 20-130bar | 6x0.7mm )()()( | 0 | 20 | 45 | 55 | 75 | 90 | 110 | 130 | Open |
4 | 50-180bar | 8x0.7mm ))(())(( | 0 | 50 | 90 | 135 | 180 | Open | Open | Open | Open |
Actual pressures may vary slightly due to parts tolerances.
The APEX Regulator has a 0.5mm pitch thread, so one full turn of the 5mm Hex moves the adjuster 0.5mm from the piston. As you can see in the table below, the different Belleville thicknesses and stack arrangements give varying levels of output depending on the adjuster position. Adjusting too far will leave the regulator open, passing fill pressure to your firing valve or closing the adjuster against the piston may leave the output at 0bar. You may not be able to drain the PCP of air if you cannot get air through to the firing valve or degassing point. So make sure you are confident in your adjustments.
We recommend using a spring stack with your regulator pressure between 30% and 80% compression of the Belleville washers for optimum performance.
Stack Number | Working Pressure | Belleville Quantity, Thickness & Stack | Use the arrangements listed below for specific pressure needs, also think of the plenum volume losses when your rifle is fired, you need a stack that can accurately and reliably compensate for the pressure drop and refill time to give reliable performance. |
1 | 25-75 bar | 8x0.6mm )()()()( | 2-10FT/Lbs Low power rifles and pistols with small plenum area |
2 | 40-155 bar | 8x0.6mm ))(())(( | 10-50 FT/Lbs rifles, or for use as an extra regulator, e.g in a HW100 Cylinder |
3 | 20-130bar | 6x0.7mm )()()( | 10-40FT/Lbs Medium power rifles, covering most rifles needs with mid-sized plenums |
4 | 50-180bar | 8x0.7mm ))(())(( | 40-200FT/Lbs High power output with large plenum area e.g FX, AGT, Kalibrgun |