2" Burrell Governors

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2" Burrell Governors

Post  Steam Traction World on Tue 21 Jul 2009, 4:29 am

Hi All.

Lilyjack asked for an explanation about our 2" Burrell Governor.

The purpose of a governor on full size engine is to maintain the speed of the engine regardless (within limits) of the load. Primarily this would have been when powering a circular saw or threshing drum.

They are notoriously difficult to get to fully operate in miniature even in 4" scale. They can easily be made to look as though they work, i.e. they spin round, as ours will, but to get them to control the engines speed is not so easy.

The problem is that you canít scale nature. The balls that provide the centrifugal force which control the lift of the valve are only 1/216th of the mass of the full size. Our 2" Burrell is 1/6th in length, 1/6th in width and 1/6th in height.

A brief explanation of how the Governor should work would probably be in order. The regulator is opened to control the desired speed of the engine. As the ball weights of the Governor spin round, centrifugal force moves the balls apart. As a consequence of this, the top of the Governor is moved down changing the position of the valve. The Governor valve restricts the amount of steam that can pass to the cylinder steam chest so as the Governor valve is forced down a greater restriction is created. The speed of the engine is reduced, the balls move closer together which lifts the Governor valve and the speed of the engine increases. The worm and wheel adjustment on the side of the Governor provides an adjustable resistance to the down movement of the valve and also provides a return force to the Governor valve.

Hope this helps.

Regards

Steve

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Re: 2" Burrell Governors

Post  hughb on Wed 22 Jul 2009, 10:01 am

Hi thanks for that . I still do not get some of it ..... Very Happy Smile Smile

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Re: 2" Burrell Governors

Post  Big Al on Wed 22 Jul 2009, 10:12 am

Hugh

It means Steve's balls aren't big or heavy enough!!

Alan

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Re: 2" Burrell Governors

Post  hughb on Wed 22 Jul 2009, 11:29 am

Big Al wrote:Hugh

It means Steve's balls aren't big or heavy enough!!

Alan
OK I geuss that is good for him but I do not want to see it . I thuorgh this was searous ????!!
Ho yes lol! flower geek rendeer Basketball Sleep drunken cherry albino farao king
That is better

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Re: 2" Burrell Governors

Post  BUNGLE on Wed 22 Jul 2009, 2:13 pm

AL (NOT SO BIG NOW !), I'M CONCERNED THAT YOU'VE SEEN STEVE SWINGING HIS BALLS AROUND lol!

BUNGLE

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Re: 2" Burrell Governors

Post  Steam Traction World on Wed 22 Jul 2009, 3:46 pm

Hi Not so big now Al, and Bungle

My balls might be small but I've got three of them. Exclamation And I can spin them around and around at about 200 rpm. Bet you can't do that. affraid

Regards

Steve

Steam Traction World

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Re: 2" Burrell Governors

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