Competition Arms

Regolatori di Pressione PCP


What is an air gun regulator ?

  • An air gun regulator is a very simple mechanical valve (Imagine a simple light switch or push button) that operates when pressure in the regulated Outlet Valve Chamber falls below a set pressure.

  • A regulator will in general be one of two designs, either an Opening and Closing Valve (Valve Opens its self with a drop in pressure) or a Closing and Opening Valve (Valve pushes open a valve when pressure drops and then closes it when pressure rises). It is designed and set up so as to keep the air pressure in the Outlet Valve Chamber at a constant pre set pressure, as the variable pressure within the Main Air Reservoir Chamber falls.

  • You have most likely been using a regulator valve in your day to day life’s that works on exactly the same principle as an airgun regulator but you don’t know it! Most flush toilets and house hold gas supplies have a regulator that works in EXACTLY the same way.


    Why would you fit a regulator ?

  • A PCP air gun in essence is quite a primitive mechanism. It has a high pressure air reservoir and the compressed air in the reservoir holds the energy. When you pull the trigger a hammer (Weight) is propelled forwards by a spring and it simply hits the Outlet Valve, which opens a little and a small blast of the compressed air (Energy) escapes and propels your pellet down the barrel.


  • In a standard unregulated PCP air gun you will normally fill the air reservoir to about 200bar (2900p.s.i) and the last good shot is about 100bar (1450 p.s.i).

  • So you can imagine with your first shot after filling to 200bar (1900 p.s.i.) the Hammer has to hit against and over come 200bar (1900 p.s.i.), so as to let out a little blast of air. Then by the point of you last shot the hammer only has to hit against 100bar (1450 p.s.i) an so it lets out a bigger blast of lower pressure air.

  • The force propelling the hammer stays constant and so the hammer weight, distance of travel, force of spring pushing it forwards is balanced against the size of the Outlet Valve and the Outlet Valve Spring pushing the valve shut so as the pressure in the air reservoir drops the energy released from the compressed air within the air reservoir is roughly constant.

  • However you will notice that this system is not perfect and power will alter over the 100bar drop in pressure in the air reservoir. This may be a slow constant fall in power, a slow rise then rapid drop of or most commonly a slow rise and fall - Curve / Arc.

  • Installing a Regulator creates an Out Let Valve Chamber (Pre Chamber, Plenum Chamber), so dividing your air reservoir into two sections. The Main Air Reservoir Chamber which you fill up and the Outlet Valve Chamber, separated from the Main Air Reservoir Chamber by the Regulator. The high pressure air from the Main Air Reservoir Chamber enters into and through the Regulator, which only allows a constant set pressure to be stored in the Out Let Valve Chamber (Pre Chamber, Plenum Chamber).

  • So during every shot the regulator valve opens and shuts and so keeps the pressure in the Out Let Valve Chamber (Pre Chamber, Plenum Chamber) constant for every shot, until the pressure in Main Air Reservoir Chamber is equal to or lower than the set pressure of the regulator.

  • By keeping the air in the Outlet Valve Chamber at a set constant pressure you stabilize your shot to shot (Feet Per Second / Meters Per Second) consistency at the muzzle. Which leads to greatly improved accuracy. It also means that the Outlet Valve Assembly can be tuned to use the energy stored within the compressed air far more efficiently.

  • Once a regulator is installed and the Outlet Valve Assembly rebalanced then you can in general use your rifle over a larger pressure range, this combined with the more efficient use of energy stored in the reservoir means that shot count remains the same for most high power air guns and some 12ft/lb. rifles (Not ultra carbines) can experience a good percentage rise in shot count.

  • Greater efficiency of energy used means that there can also be a reduction in muzzle blast ‘Kick’ - ‘Flip’ and a reduction of muzzle noise ‘Blast’.

  • For more details upon air gun regulators and the most informative and comprehensive information upon air gun regulators available in anywhere world wide please view all the relevant videos & FAQ’s upon Air gun Regulators You Tube channel: https://www.youtube.com/user/AirgunRegulators




Regulator Pressure Adjustment 


  • 1: There is a red dot / hole in the rear face of the Pressure Adjusting Screw (PAS) (When installed this end of the Regulator will be facing the Main Air Reservoir Chamber (MARC) / inlet valve) and a small slot / dot punch mark on the Regulator Body Case. These two marks should be roughly inline and they are for your visually reference.

  • 2: The Regulator will have been set and marked at either 95 bar or what-ever pressure you requested it to be set at, at the time of ordering.

  • These two marks are incase you wish to adjust the regulator to either a higher or lower pressure setting in the future, so as you know where it was set to originally. (If stripping the regulator 1: Make a note of the number of screw turns you have to make to take the PAS out. So as you can put back in to the same place or 2: Use a vernier to measure the distance down the hole to the head of the PAS as well).
    Note: If you have asked the Regulator to be marked at i.e. 80, 100 & 130 Bar etc then 1 Mark in the Body Case will be for the lower pressure, 2 For the intermediate and 3 Marks for the highest pressure.

  • 3: It has been set on a test rig with a calibrated gauge. However the small ‘Indicator’ fitted to your air guns, is only a ROUGH INDICATOR not a accurate gauge in general all come from ‘The Miniature Pressure Gauge Co’ Birmingham (They place the Logun, AA, etc. Logo in the dial at time of manufacture) and are on a + / - of between 5 & 7 % so if it reads under or over what you know the regulator is set at on your guns gauge, take a note of this and keep it for reference as the regulator will be set more accurately, than what the Indicator says upon your gun.

  • 4: To Increase + the Regulators working / output pressure, simply - turn the Pressure Adjuster Screw anti-clockwise. One (1) Full turn outward will be roughly 40bar e.g. Typically 100 to 130 bar is three quarters (3/4) of a turn.

  • 5: To Lower - the Regulators working / output pressure simply - turn the Pressure Adjuster Screw clockwise. One Full turn outward will be roughly 40bar e.g. Typically 100 to 70 bar is three quarters (3/4) of a turn. 


  • 6: MOST IMPORTANTLY - If you take the Regulator to pieces, removing (Taking Out) the Piston be very very careful with the end of the Piston Stem as it is quite sharp & most importantly seals against the soft Pressure Adjuster Screw Cut Off Face. Damaging this Knife Edge will mean that the Regulator does not work correctly. Protect it, when it is removed from the Body Case, use a plastic or rubber tube etc. slipped over the end.

    7: MOST IMPORTANTLY - If you take the Regulator to pieces, removing (Taking Out) the Piston, there is an o-ring fitted around the Piston Stem from the side of the Pressure Adjuster Screw. This simply fits around Piston Stem and is held in place by friction and when in use by high the air pressure in the reservoir. When you reassemble the Regulator you will need to hold this in place with a small hollow tube such as a ‘Bic Pen’ body, whilst you CAREFULLY WIGGLE the Piston Stem through it. If you ‘Don’t’ drill a breath hole as recommend this seal will become dislodged and the regulator will fail.

  • 8: NOTE - Importantly, when you fill up / top up the Gun from below the Regulators working pressure, the regulated side will more often than not read slightly higher than the regulated pressure initially - So fire the rifle two or three shots after / during final refilling to set it working (Please View: FAQ’s on You Tube for more information upon this).


    Full Service Instructions Video:

    ​Over time (Many years) all the O-rings in your PCP air gun will age, harden and crack. This is the same for your regulator and so we have produced a video that shows you how to fully service your regulator.





Ultimo Aggiornamento 11/11/2010 § G.M.
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