Posted by: Mark Flores on March 22, 2003 at 23:57:00

: a friend of my son has a spider sonix that leaks air out the barrel. (with the hammer cocked back) it has to be the valve seal, i think. we opened it up and the seal is just a hard piece of plastic. is that all there is to it. if so how the heck does this seal anything? To answer your question the cup seal seals co2, air, or nitrogen from entering any further into your marker using the pressure from the co2 or Nitro until the trigger is pulled and the marker is fired. How this happens is, you may need your parts diagram that came with your gun or visit: http://www.kingmanusa.com/section/support/diagram/pdf/spyder_sonix.pdf for the Spyder Sonix diagram, the gas from the tank enters the gun through the C/A Adapter it flows through the steel braided hose to the vertical adaptor. It is stored in the low pressure chamber and flows into the receiver. The cup seal mounted on the valve pin is forced closed under pressure of the valve spring and the co2 or nitrogen. The pressure must go through the valve body in order for the marker to fire and re-cock itself. The only way air, co2, or nitrogen is supposed to go through the valve body is when the cup seal mounted on the valve pin is moved forward by the striker, when the cup seal is moved forward it creates an opening for the air, co2, nitrogen to enter into the receiver and out of the barrel. Most of the time the leak is caused by the valve body Item # 14 of the Sonix schematic. If it has any dents or the o-rings are mutilated it is a possible candidate of the problem. If you bought it recently and have not taken the valve body out or touched it with any kind of metal or hard object the warranty is not void and it can be replaced for free. If the problem doesn't qualify for option 1, option 2 is to buy an after market valve body which should include a valve pin and a cup seal, and option3 three is to buy a used stock valve body. If everything with your valve body appears to be fine you may want to purchase a spare valve body to put in your sonix to test the old valve body and just to have a spare cause you never know when something may go wrong with it. On very rare occasions the pressure coming out of a co2 tank may be at extreme pressure and that is what is causing the air to leak. I've experienced this after I have used my tank and it is half or less than half full. After I get home from the field I want to clean my marker, oil it, and get the excess oil out by firing it with co2. The co2 has been sitting for a while in my closet at room temperature. When I screw the tank into the C/A Adapter the first few shots are at 1200 psi and that is when my gun leaks even though nothing is wrong with the valve body. You may only need valve body o-rings. Check them and if they’re mutilated in any way replace them. Tank o-rings will not replace the valve o-rings. Only valve o-rings will work.

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