Hi PD's....I posted this on Model Mayhem earlier this morning.......Derek 

Guys....may seem a simple question  ......but clearly we have two differing locations

1. install the steam control regulator prior to the lubricator as shown in many examples of larger twin cylinder D/A engines...Saito, Stuart D10...JMC....ANTON....etc
2. have the steam control regulator pre installed in the engine assembly ...similar to many oscillator's...or infact the Monahon range of larger twin cylinder engines

Clearly...the only major thing that changes here is that with option 1. the regulator sees hot wet/dry steam, or with option 2. the regulator sees hot wet/dry steam + a mist of steam oil

I suppose a part of the confusion is that there is an absence of documentation on steam control regulators....  ..... or manufacturers ...any comments or thoughts appreciated......Derek

Hi Derek,
If the regulator is the sliding disk type I would place it after the Lubricator, if it is a needle valve style I would place it before the lubricator.
Regards,
Gerald.