My bostitch framing nailer fires multiple nails each time i pull

Some trigger valves (tva6) are sensitive (defective?) however there are some things you can try to change how the gun acts. I have noticed that the brand of oil has an effect on the orings. Some brands will swell the orings, I like Paslode nail gun oil. Do not wash the gun with gasoline or wd40. Use diesel. Change the nail depth setting one position. Lowering the air pressure will make a difference. I find that most operators use too much pressure. A stronger safety spring under the trigger will separate the trigger and firing pin quicker. Finally you could use single fire trigger. Good luck

Remove the nails and take off the trigger to expose the trigger valve (usually part # tva6). Connect air and spray soapy water on the valve to determine if the air is leaking from the center of the valve or around the outer edge between the body and valve. If leaking from the center, could be defective valve or debris under oring. Pop out the valve and examine internal parts for cut oring or defect. If leaking from between body, you could have cut orings installing the valve. Make sure that there are no rough edges in the body of the gun. Bump fire or single fire happens with the trigger type not the valve. Bump fire trigger is usually black metal and single fire trigger is light color plastic. Good luck

This isn't actually answering your question, but I couldn't figure out how to just post a question.
I have Bostitch BT200. For probably 15 years. Haven't used it much. Mostly used nails abou 1 1/4 inches. But recent project needed 5/8 inch. It will fire 1 fine. But won't fire another unless I pull the magazine open and push it in. Then it will fire 1 only. Have to open and close magazine every time to fire 1 single nail. It fires longer brads fine. What can I do?

Most nailers work better by bump firing the gun. Less likely to double fire. This is a common problem amoung brands. If you place nailer on work then trigger, you may/will have problems as you describe. There is usually an option of triggers or builtin method of single firing the gun. With single fire trigger, you can place gun on work and fire. The will not reset for next round untill you let go of trigger and lift gun off the work. If your gun is double firing even with bump method, then replace the trigger valve.

Bostitch nailers have two triggers available. Black trigger is rapid fire while the gray is single shot. Both triggers are usefull depending on type of work. Most people say that there is a degree of accuracy with single shot allowing for better placement of nail. If speed is your goal then use the black trigger to bump fire. More information and parts can be found at www.bostitch.com , look for "Support" tab, then "service / parts " find your model number from the pull-down list and search for the manual and parts list for needs. Good luck on your projects.

Could have the sequential trip trigger on the gun, there is a single shot trigger available! I believe the single shot is Grey in color!

drive pin o ring is shot. deair the gun remove top pull drive pin replace oring oil the heck out of it and go to work

Make sure that when you run with one gun that your psi is between 90-110. You may need a kit. Is it an RN45 or 46? Go to Stanley Bostitch online and look up parts and schematics. Kits should only be about 15-20 dollars, easy to put in, and come with instructions. Lemme know. Please rate me

check the safty shaft and see if something could be under trigger safty causeing it to fire.

Professional-grade varieties are automatic, and fire a nail directly upon pulling the trigger. A semi-automatic nail gun is more appropriate for beginners, since it requires a two step process: pull the trigger and then tap the barrel against the wood. This safety feature protects the user from accidentally firing a nail gun and injuring himself or others.