Vacuum Ejector

There are two sizes of ejector in the range both by Bob Bransom, designed to create the most vacuum using the least amount of steam. Both provide a reliable and effective means of creating vacuum on steam locomotives for powering the brakes systems fitted to 5”, 7¼” & 10¼” gauge rolling stock.

The Ejector performance has been optimized to achieve the following:

• Create 21″ Hg. Vacuum over a normal working range between 70 – 80 p.s.i using reasonably dry saturated steam.
• The minimum boiler pressure required to create 21″ Hg. to be about 35 p.s.i.
• The ejector to maintain this level of vacuum up to 120 p.s.i.
• The rate of air ejection to be capable of exhausting a brake system appropriate to the size of the locomotive.
• Low steam consumption. The demands for steam to be as low as practicable and in proportion to the locomotives grate area.
• The air clack to remain tight over long periods without maintenance.

If a larger than optimal size ejector is fitted, this is not likely to affect performance but will result in greater steam consumption and provide higher evacuation rates.

What’s in the box?

1 x Vacuum Ejector

Instructions – PNR-4R – Vacuum Ejector – No. 0

Instructions – PNR-12M – Vacuum Ejector – No. 3