It is currently Sun Nov 19, 2017 1:59 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Cylinder Cocks
PostPosted: Mon Sep 21, 1998 4:18 am 

In my quest to learn more about steam locomotives my question for the month is about cylinder drain cocks. I know they allow (conedensed?) accumulated water to be removed from the cylinders rather than popping off a cylinder head. How could so much water accumulate in a cylinder? I have seen pictures of engines running with the cocks open, and blowing steam out the bottom. Is this just for show (like black smoke)? And finally, how does the engineer control the opening and closing of the cocks from the cab? Steam, pneumatic, hydraulic?<p>Thanks.



Railway Preservation News
hkading@rypn.org


  
 
 Post subject: Re: Cylinder Cocks
PostPosted: Mon Sep 21, 1998 8:16 pm 

Sometimes it is for show. You often see EUREKA running with cocks open because Dan likes the look of the steam blowing off. <p>Throttles all leak to some extent, and hydrostatic lubricators deliver oil in a jet of steam. When the locomotive isn't running it condenses on the cooling cylinder surfaces. <p>Water isn't compressible (which makes hydrostatic testing safe) and must be removed or there is a danger of blowing off a cylinder head with trapped water so we have cylinder cocks to do the job. <p>Some are manually operated with a seried of rods and levers, and some are operated with steam or air. Some will open automatically at set pressures to relieve any condensation which develops even if the engineer forgets to open them. Several designs were described in the old Cyclopedias of the '20s and '30s.<p>New copies of manual Baldwin cocks are available from Backshop - Lou Dahm had to make some for Colo Rr Museum some time back and Bernie has the patterns. <p>Dave<br>



lathro19@idt.net


  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 5 hours [ DST ]


 Who is online

Users browsing this forum: Bing [Bot], Google [Bot], kevin kohls, Mr. Ed, scottychaos and 39 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: