steam Zone valve part

jktrammd

Hello, 
Looking for help identifying this part that attaches below the zone valve housing. Inside the part is a bar and a spring below the bar. The bottom is a solid plug. I have two of these zone valves and the unknown part on the other one has a bar inside and a loose ball below the bar( no spring) solid plug on the bottom.
 Thanks in advance, Jim

JUGHNE

Never saw one before in my life.

Could it be a simple vacuum breaker that opens when valve is closed to allow the main to drain back unhindered by vacuum built up by the collapse of the steam as it cools off.
It would let air into the pipe.
Just a WAG.

The U bend of copper? could it be an equalizer tube?
(Thinking of refrigeration expansion valves...another WAG)

DanHolohan

I have no idea. Always something new in what's old!

EBEBRATT-Ed

All it is is a lever operated gate valve. Looks like an electric actuator behind it to open and close the valve.

I am guessing the u shaped tubing bleeds a little steam across the valve to make opening and closing under pressure easier........equalizes the pressure on the gate. I have no clue what the other devise is.

As for parts I am sure your out of luck. That has to be 1950s

EBEBRATT-Ed

Looks like it says" Mar Coil heater Company, New Jersey"

DanHolohan

Ed, you the man!

CLamb

The Smithsonian has a collection of their catalogs--but not online. https://americanhistory.si.edu/collections/search/object/SILNMAHTL_29581

DanHolohan

Nice find!

jktrammd

Thanks for the comments, appreciate them.
This steam system is part of a 100 year old church. Slowly rebuilding steam system and learning a lot from your books and this great website’s experts.
Jim

DanHolohan

Thanks, Jim!