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Compounddriver

SE4 Boiler pressure

HI
Does any one know the working pressure on an SE4 boiler.
My guess is 10 to 12lbs but would like to know for sure.

Made the first boiler Monday and hydraulic tested to 100psi with no probelms.

Regards Kevin
SPOKESMAN

A tough one mate, around the 15-20 pound mark, you can adjust the safety valves on these a little so it can be varied slightly.
In my own experience the boiler and fittings give very good steam tightness, just a few turns of the cranks by hand on mine will produce enough compression to sound off the whistle went its opened.
Compounddriver

Hi

thanks for tat i had a feeling the pressure would be under 20. il make the safety valves with a range between 10 and 20 psi.

Regards Kevin
tmuir

Safety valves on all 'toy' steam engines are officially set to open at 14.5 PSI or 1 Bar due to safety regulations say steam toys can not have more than 1 atmosphere of pressure.
Don't know if that law was around when Se4s were made though.
Mamodman123

Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly
Chris

Mamodman123 wrote:
Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly


All valves are adjustable slightly. They are dependent on the quality of the biro you steal the spring from.
tmuir

Chris wrote:
Mamodman123 wrote:
Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly


All valves are adjustable slightly. They are dependent on the quality of the biro you steal the spring from.


Aint that true.
SPOKESMAN

Chris wrote:
Mamodman123 wrote:
Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly


All valves are adjustable slightly. They are dependent on the quality of the biro you steal the spring from.


YES AND NO. SE4s and earl;y Mamods/Hobbies and Bowmans had a spring retained by a threaded collar, thus the collar could be rotated on further increasing the compression on the spring and making the valve harder to open, thus increasing the boiler pressure. You can also put a stiffer spring in there.
Mamodman123

Chris wrote:
Mamodman123 wrote:
Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly


All valves are adjustable slightly. They are dependent on the quality of the biro you steal the spring from.


We've all been there Chris
Dauntless

SPOKESMAN wrote:
Chris wrote:
Mamodman123 wrote:
Roughly 15 PSI, they were tested to 100 lbs apparently

As Mike said, the valves are adjustable slightly


All valves are adjustable slightly. They are dependent on the quality of the biro you steal the spring from.


YES AND NO. SE4s and earl;y Mamods/Hobbies and Bowmans had a spring retained by a threaded collar, thus the collar could be rotated on further increasing the compression on the spring and making the valve harder to open, thus increasing the boiler pressure. You can also put a stiffer spring in there.


clever system
better than the modern peened end
SPOKESMAN

Modern ones can easilt be 'modded'!
       The Unofficial Mamod and Other Steam Forum Forum Index -> General discussion
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