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o.k. to use a longer safety valve in Minor 2?

Jerseysteam
Junior Member
Joined: June 9th, 2018, 12:07 am

June 24th, 2018, 7:21 pm #1

The short, ~1” safety valve that came with my Minor 2 is suspect. It doesn’t bubble or release steam even with a new gasket where the valve meets the boiler. I have a handful of longer, ~1.5” valves for Mamod engines that are known to work. Is it o.k. to use a longer valve until the short valve that I have on order arrives? The threads are the same and the longer valve stem doesn’t bottom out. Or... does this present a safety hazard?

Thanks!
Dave

I love the smell of burning Esbit in the morning.

https://m.youtube.com/channel/UCTKROHuNvjsFk_rj3yydUAg
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classixs
Steam Supreme Being
Joined: April 14th, 2012, 5:01 pm

June 24th, 2018, 7:32 pm #2

Shouldn´t make any difference whatsoever, as long as the threads on your replacement, isn´t so long that the "tube" reaches into the water, making it spew boiling water instead of steam, should it decide to lift.
Cheers
Jan

WEBSITE: SteamUp YOUTUBE: SteamUp
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Alan 63'
Steam fanatic
Joined: September 23rd, 2017, 10:31 am

June 24th, 2018, 7:46 pm #3

I cannot say anything more than what Jan said.
Thanks Alan.

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Jerseysteam
Junior Member
Joined: June 9th, 2018, 12:07 am

June 24th, 2018, 8:07 pm #4

The bottom of the tube to the top of the plug hole on the Minor 2 is 1-2mm closer than to the top of the sight glass on a Mamod that uses the longer valve. This indicates sufficient headroom. I’ll give a spin, stand back and report back. Thanks.
Dave

I love the smell of burning Esbit in the morning.

https://m.youtube.com/channel/UCTKROHuNvjsFk_rj3yydUAg
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kevin
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kevin
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Joined: May 14th, 2012, 1:34 pm

June 24th, 2018, 10:30 pm #5

No difference, if it fits it fits
Im not a megalomaniac, I just want to rule the world !
www.ITA-SHOP.co.uk
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Jerseysteam
Junior Member
Joined: June 9th, 2018, 12:07 am

June 25th, 2018, 1:10 am #6

Seems o.k. Thanks!
Last edited by Jerseysteam on June 25th, 2018, 4:48 pm, edited 1 time in total.
Dave

I love the smell of burning Esbit in the morning.

https://m.youtube.com/channel/UCTKROHuNvjsFk_rj3yydUAg
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classixs
Steam Supreme Being
Joined: April 14th, 2012, 5:01 pm

June 25th, 2018, 3:08 pm #7

You´re most welcome.

Have fun steaming your MM2 :-)
Cheers
Jan

WEBSITE: SteamUp YOUTUBE: SteamUp
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Dr. Rog
Steam Supreme Being
Joined: December 30th, 2008, 5:53 pm

June 25th, 2018, 8:31 pm #8

Yo Dave
If you push the pin up, compressing the spring, is it stiff or stuck?
It could be chalked up or a melted washer could have glued it shut.
Cheers Rog https://www.youtube.com/user/DrRogB/videos New positive, and successful motto for 2017: carpe diem
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Jerseysteam
Junior Member
Joined: June 9th, 2018, 12:07 am

June 25th, 2018, 9:30 pm #9

Dr. Rog wrote: Yo Dave
If you push the pin up, compressing the spring, is it stiff or stuck?
It could be chalked up or a melted washer could have glued it shut.
Actually, the original short valve doesn’t appear to be stiff or stuck. Funny thing is, neither valve does much of anything in the Minor 2. I used the new, longer one in another engine (much larger SP6) and it let off steam just prior to being used in the Minor 2. I’m not sure what that means, if anything. The Minor runs great, otherwise. 
Dave

I love the smell of burning Esbit in the morning.

https://m.youtube.com/channel/UCTKROHuNvjsFk_rj3yydUAg
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Dr. Rog
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Joined: December 30th, 2008, 5:53 pm

June 26th, 2018, 8:12 pm #10

So what's the problem?
Have you tried not starting the engine and just letting the pressure rise? That should show it works.
Cheers Rog https://www.youtube.com/user/DrRogB/videos New positive, and successful motto for 2017: carpe diem
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