Vacuum Ejector – No 1

Part No.  PNR-4R

£78.95 Inc.VAT

Designed to create the most vacuum using the least amount of steam. Provides 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. 1

Installation Instructions
Click mounting diagram below to enlarge:

PNR-4R - Vacuum Ejector Mounting Diagram

Thread sizes are 5/16 – 32

Nuts and nipples for pipe soldering included

See a Schematic of the Vacuum Braking System.

Read our Buying Guide for Vacuum Brakes


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