Post by fredgraham on Jun 3, 2010 18:59:55 GMT
Hi Folks,
I have noticed that on some commercial engines (E.G. Hemmens & Monahan) they have a water pump which is directly driven off the crank shaft and have the ram operating vertically and the valve boxes disposed horizontally.
In all the model plant descriptions I have seen over the years, pumps are normally geared down by 4 or 5 to 1 and the valve chambers are arranged in a vertical attitude.
I have always thought that pumps were run at a lower speed to improve their perfomance and that valve boxes were arranged in the vertical plane to 'gravity assist ' seating.
If anyone has experience with such a plant having a water pump arranged as described, Is it reliable and does it work efficiently.
All the best, Fred Graham
I have noticed that on some commercial engines (E.G. Hemmens & Monahan) they have a water pump which is directly driven off the crank shaft and have the ram operating vertically and the valve boxes disposed horizontally.
In all the model plant descriptions I have seen over the years, pumps are normally geared down by 4 or 5 to 1 and the valve chambers are arranged in a vertical attitude.
I have always thought that pumps were run at a lower speed to improve their perfomance and that valve boxes were arranged in the vertical plane to 'gravity assist ' seating.
If anyone has experience with such a plant having a water pump arranged as described, Is it reliable and does it work efficiently.
All the best, Fred Graham