DISCOVERY VALVE SCREW KIT 3200 PSI

$8.00

 These screws are designed by Magnum Airpower LLC and custom manufactured.

 The second and third photos show just one of these screws holding the valve with 3300 PSI in the tube. The pressure on the gauge is clearly visible in the second photo. This is the strongest screw design that exists for Discovery models.  

 These Torx-drive stainless steel screws are far stronger than standard Discovery valve screws. They are the strongest screws in existence that fit Discovery models. They safely allow you to increase the operating pressure to 3200 PSI with a safety ratio above 3:1. They are the same length and thread size as the OEM screws so they are a direct replacement with no modifications to your gun. The head is slightly larger so they fit the holes in the tube perfectly.

 Message me if you have any questions, making modifications to your airgun can be dangerous if not done correctly. 

 Except for the original valve screws, the Discovery PCP tube assembly is as strong as the 3000 PSI pistol tube assemblies. All are made with the same 1020 DOM steel tubing. All of the other pressure containing components are as strong, the stainless steel fill adapter is actually stronger than the aluminum one on the PCP pistols. It is perfectly safe to use more pressure in the Discovery when the valve screws are upgraded. I have destructively tested these parts as the photos confirm. 

THESE SCREWS DO NOT FIT THE MAXIMUS. I have upgrade Maximus valve screws in a different listing. Empty all air or CO2 pressure from your airgun before installing these screws or a fatal injury could occur.

 These are 410 stainless steel heat treated to meet metric class 12.9 with a specified hardness of HRc 39-43. The approximate tensile strength is 185,000 PSI.

 The screws require a T25 driver, a T25 bit is included as shown in the photo. They are designed to fit the threaded holes very tight when fully installed. The last 1/64 of an inch requires a little extra force to get the screw head snug against the valve. Do not over-tighten, they should be hand-tight using a driver handle. Using a wrench or ratchet can damage the threads in your valve. The valves are aluminum so the valve threads will strip out far more easily than the threads on these hardened screws.

 DO NOT PRESSURIZE A TUBE WITH ONLY ONE SCREW AS SHOWN IN THE SECOND PHOTO, A LETHAL ACCIDENT COULD OCCUR. THAT DEMONSTRATION WAS DONE IN A CONTROLLED ENVIRONMENT WITH PREPARATIONS THAT MADE IT RELATIVELY SAFE TO DO.

 The following chrony test results compare a standard Discovery .22 to one modified with a combination of these and other custom parts I offer. 14.3 Grain pellets were used for both tests. Testing was stopped at 100 FPS below peak power. 


Unmodified Discovery .22 starting at 2000 PSI :

1)      888.1   muzzle velocity in FPS (feet per second)
2)      901.0   peak power
3)      899.8
4)      878.8
5)      877.7
6)      871.5
7)      855.6
8)      854.9
9)      849.6
10)    843.0
11)    837.1
12)    836.0
13)    827.6
14)    819..7
15)    813.4
16)    797.1   100+ FPS below peak power

.22 Discovery with custom valve screws, Magnum Adjuster, wide-bore gauge port (or bypass cap), 26" Maximus barrel and a starting pressure of 3200 PSI. 

1)     958.8
2)     965.9
3)     971.2
4)     973.4
5)     977.2
6)     978.9
7)     984.5
8)     991.6
9)     994.7
10)   989.3
11)   997.6
12)   1000
13)   1007
14)   1002
15)   1005
16)   1009   peak power
17)   998.8
18)   1002
19)   990.1
20)   982.7
21)   977.8
22)   965.2
23)   958.3
24)   949.4
25)   938.3
26)   918.7
27)   907.6   100+ FPS below peak power