Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #11   Report Post  
Old February 21st 08, 12:40 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2006
Posts: 580
Default Leaky valve problem

In article ,
Bob Engelhardt wrote:

You could put a cap on the output pipe. With a couple of nice handles
for easy & fast removal. Bob


I'll probably do that in any case. The cap will cost $44 (2,5"
firehose) ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/

  #12   Report Post  
Old February 21st 08, 01:00 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jul 2006
Posts: 2,423
Default Leaky valve problem

nick hull wrote:
Bob Engelhardt wrote:
You could put a cap on the output pipe. ...


I'll probably do that in any case.


Well, that's all you'll need - it's only holding 2 1/2 psi (when the
leak has filled behind it) and the valve will hold back all but the leak
when you take the cap off.

The cap will cost $44 (2,5" firehose)


I know that you have a lathe! BG

Bob
  #13   Report Post  
Old February 21st 08, 03:21 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2006
Posts: 580
Default Leaky valve problem

In article ,
Bob Engelhardt wrote:

nick hull wrote:
Bob Engelhardt wrote:
You could put a cap on the output pipe. ...


I'll probably do that in any case.


Well, that's all you'll need - it's only holding 2 1/2 psi (when the
leak has filled behind it) and the valve will hold back all but the leak
when you take the cap off.

The cap will cost $44 (2,5" firehose)


I know that you have a lathe! BG


Yes but the firehose thread is 7 tpi, not listed on my change gear
charts ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
  #14   Report Post  
Old February 21st 08, 11:50 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Mar 2007
Posts: 509
Default Leaky valve problem

On Wed, 20 Feb 2008 21:21:40 -0600, nick hull wrote:

In article ,
Bob Engelhardt wrote:

nick hull wrote:
Bob Engelhardt wrote:
You could put a cap on the output pipe. ...


I'll probably do that in any case.


Well, that's all you'll need - it's only holding 2 1/2 psi (when the
leak has filled behind it) and the valve will hold back all but the leak
when you take the cap off.

The cap will cost $44 (2,5" firehose)


I know that you have a lathe! BG


Yes but the firehose thread is 7 tpi, not listed on my change gear
charts ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/


On my lathe, I have to swap the stud gear from 24 tooth to 48. Then I
get 4 - 7 instead of 8 - 14. Could you do similar somewhere in your
gear train?

Pete Keillor
  #15   Report Post  
Old February 22nd 08, 01:05 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2007
Posts: 3,146
Default Leaky valve problem

On Feb 22, 8:18*am, nick hull wrote:
...
My error, the thread I need is 7 1/2 tpi ;(


Do you have a friend with a South Bend 10L? 7-1/2 is on the 70 speed
gearbox.


  #16   Report Post  
Old February 22nd 08, 01:18 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2006
Posts: 580
Default Leaky valve problem

In article ,
Pete Keillor wrote:

On Wed, 20 Feb 2008 21:21:40 -0600, nick hull wrote:

In article ,
Bob Engelhardt wrote:

nick hull wrote:
Bob Engelhardt wrote:
You could put a cap on the output pipe. ...

I'll probably do that in any case.

Well, that's all you'll need - it's only holding 2 1/2 psi (when the
leak has filled behind it) and the valve will hold back all but the leak
when you take the cap off.

The cap will cost $44 (2,5" firehose)

I know that you have a lathe! BG


Yes but the firehose thread is 7 tpi, not listed on my change gear
charts ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/


On my lathe, I have to swap the stud gear from 24 tooth to 48. Then I
get 4 - 7 instead of 8 - 14. Could you do similar somewhere in your
gear train?


My error, the thread I need is 7 1/2 tpi ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
  #17   Report Post  
Old February 22nd 08, 03:30 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Aug 2006
Posts: 580
Default Leaky valve problem

In article
,
Jim Wilkins wrote:

On Feb 22, 8:18*am, nick hull wrote:
...
My error, the thread I need is 7 1/2 tpi ;(


Do you have a friend with a South Bend 10L? 7-1/2 is on the 70 speed
gearbox.


Unfortunately no ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
  #18   Report Post  
Old February 23rd 08, 04:18 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Mar 2007
Posts: 509
Default Leaky valve problem

On Fri, 22 Feb 2008 07:18:32 -0600, nick hull wrote:

In article ,
Pete Keillor wrote:

On Wed, 20 Feb 2008 21:21:40 -0600, nick hull wrote:

In article ,
Bob Engelhardt wrote:

nick hull wrote:
Bob Engelhardt wrote:
You could put a cap on the output pipe. ...

I'll probably do that in any case.

Well, that's all you'll need - it's only holding 2 1/2 psi (when the
leak has filled behind it) and the valve will hold back all but the leak
when you take the cap off.

The cap will cost $44 (2,5" firehose)

I know that you have a lathe! BG

Yes but the firehose thread is 7 tpi, not listed on my change gear
charts ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/


On my lathe, I have to swap the stud gear from 24 tooth to 48. Then I
get 4 - 7 instead of 8 - 14. Could you do similar somewhere in your
gear train?


My error, the thread I need is 7 1/2 tpi ;(

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/


Nope, can't do that one, sorry. It jumps from 7 to 8, although it
does 6-1/2 and 6-3/4. Now that's a goofy pitch.

Pete Keillor
  #19   Report Post  
Old February 23rd 08, 05:42 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Feb 2007
Posts: 12
Default Leaky valve problem

I was the Engineering Officer on two Coast Guard Cutters, Auxiliary
Chief on one, Main Prop Chief on another, and general engineer on my
first. When a cutter is in drydock the skin valves and other important
valves are routinely removed and tested (the inlet side of the valve is
filled with water and a blank flange with an water fitting attached is
bolted to the valve flange. A predetermined amount of pressure is added
through the fitting (150% of the working pressure? I don't recall
exactly)). A specified amount of leakage is allowed depending on the
size and type of the valve, and the normal operating pressure of the
system. The quantity allowed is in Chapter 505 of the Naval Ships
Technical Manual (NSTM) titled Piping Systems. Small valves did not
allow any leakage, whereas larger valves were allowed XX drops per
minute. Some valves (again depending on the type) weren't allowed any
leakge (ball valves?). I tried to find a copy of this chapter (505) of
the NSTM online without any luck ,to give as a link. I'm sure there are
specifications elsewhere in the civilian world.

I did find two chapters that may be of interest to this group (at
http://www.fas.org/man/dod-101/sys/ship/nstm/ .); Chapter 075 -
Fasteners and Chapter 613 - Wire and Fiber Rope Rigging. One chapter I
couldn't find was Chapter 078 - Seals that is VERY good reading. I wish
now I had kept copies of some of these manuals when I retired as they
are is very good and can be very pertinent to our hobby/job.

Dave Young




nick hull wrote:
I have a gate valve with a small leak I need to fix. The valve is
stainless and in good condition but has a very small leak when closed
tightly. It's a 3" valve with a non-standard flange so replacement is
out of the question. The valve will be seldom operated and I could live
with a fix that sealed the valve tight and allowed the valve to be
opened ONCE (for a fire hose connection).

The big complication is that the valve is welded together and cannot be
taken apart.

I was thinking of putting a thin sheet of plastic on the gate, but if it
washed off when opened it might jam something. Maybe just a thin bead
of silicone on the upstream side? It's a water gravity system with only
5' of water head so pressure is extremely low.

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
leaky tempering valve grodenhiATgmailDOTcom Home Repair 2 October 4th 07 09:09 PM
Leaky main water valve [email protected] Home Repair 5 March 22nd 07 03:25 PM
Leaky Kohler shower valve Stubby Home Repair 4 December 31st 06 01:02 AM
leaky valve for icemaker feed tap. ameijers Home Repair 4 June 5th 06 04:43 PM
Valve,Butterfly valve,Globe valve,Check valve,Ball valve,Plug valve,Marine valve,Gate valve,Flow control valve [email protected] UK diy 1 April 17th 06 09:29 AM


All times are GMT +1. The time now is 12:31 PM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017