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Updated on August 23, 2008
laanguiano
Participant
August 23, 2008 at 3:44 pm
Q:

Understanding the bolt and top hat

So I dont understand how the air comes out of the top hat. The hammer hits the tophat and the air comes out. Okay I get it, but why do we screw the top hat into the valve then? If you tightened the top hat screws too tight would air not come out? Does the screws scrape the valve on every shot since the top hat is pushed down for the air to come out?

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Viewing 8 replies - 1 through 8 (of 8 total)

walkonking
Participant
August 25, 2008 at 1:17 am

get-the-blue-jay
Participant
August 24, 2008 at 3:01 pm

http://talonairgun.com/forum/viewtopic.php?t=353

here are some pics, you should be able to see your answer with them

shrpshotr28
Participant
August 24, 2008 at 2:54 pm
quote laanguiano:

Let me rephrase my question. Im not asking about top hat adjustments, im talking about how the air comes out.

If air comes out the valve by the hammer hitting the top hat, then how does the top hat move if we screw the top hat screws into the valve stem? Shouldnt that stop the movement needed to release air?

The set screws lock the tophat and valvestem together. They both move rearward as a single piece, opening the valve, when struck by the hammer.

Adjusting the TH is changing the limit of how far the valve can open.

laanguiano
Participant
August 24, 2008 at 2:50 pm

Let me rephrase my question. Im not asking about top hat adjustments, im talking about how the air comes out.

If air comes out the valve by the hammer hitting the top hat, then how does the top hat move if we screw the top hat screws into the valve stem? Shouldnt that stop the movement needed to release air?

synopsys
Participant
August 23, 2008 at 11:54 pm

Lets see if I can make this make sense… 😯

First there are two threaded parts to the top hat, the tophat has internal threads that screw it on and off the threaded section of the valve stem changing the distance from the back of the tophat to the front of the valve body. (muzzle of gun=front)

The tophat is set in place by a set screw that pushes against the threaded section of the valve stem. The set screw is the little black one on the side of the tophat and does not enter the air flow area of the valve stem. The valve stem is only threaded under the tophat and on the outside of the tube that goes into the valve assembly.

Screw the set screw in too far or too tight and you will destroy the threads on the valve stem or kink/dimple the valve stem itself, constricting the section of the tube where the air passes through to propel the pellet (really bad deal and removing the whole valve assembly is required).

If you screw the tophat too far onto the valve stem, making the gap between the tophat and the valve body really small it will bind on the section on the outside of the valve stem where it is not threaded and at that point you can no longer decrease the tophat distance to valve body. If the whole assembly continues to spin it is spinning the whole valve stem and tophat insdie the valve assembly…

A tophat that is set too far from the front of the valve body is pushed too far into the valve assembly and releases more air than what is needed to shoot the pellet. In doing so you lose shots per tank from excess air being released from the tank. Adjusting the tophat to an efficient position gains a more consistent shot velocity, more shots per fill and a flatter overall power curve (less variance between shots over the fill of a tank)…

Hope that answers the question… 😕

get-the-blue-jay
Participant
August 23, 2008 at 6:03 pm

if you torque the screws too much all that will happen is the inside of the stem will have a cupel of indents, will not rub on anything as there is nothing there to rub on.

laanguiano
Participant
August 23, 2008 at 5:05 pm

I know the screws are there to secure the top hat… thats not what I was asking.

sotxguy
Participant
August 23, 2008 at 4:57 pm

The Top Hat is threaded onto the valve stem. The screws are there to stop the TH from moving after its been adjusted. Please review the Quick reference section, many questions will be answered plus many diagrams that show how the gun is put together. A picture is worth a thousand words 8)

Viewing 8 replies - 1 through 8 (of 8 total)

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