Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Search this Thread Display Modes
Old 03-04-2008, 05:13 AM   #1
Join Date: Jul 2007
Posts: 16
Share |

Flow direction

I have a general interest question.On water valves,especially "gate" valves there is an arrow on the body that shows the direction of the water flow.On my icemaker water line, one of these valves were installed backwards,it has been in place for several years and has supplied the icemaker with water.It became clogged up and I had to replace it,that's when I noticed that it was backwards.Now my question: What is the arrow on the body of the water valve for? If it is for water flow,then why did the valve installed backwards work? Just asking for general interest.

jacob is offline   Reply With Quote
Old 03-04-2008, 07:50 AM   #2
Long-Time DIYer
Mike Swearingen's Avatar
Join Date: Mar 2005
Location: On Albemarle Sound In Northeastern NC
Posts: 1,460

Flow direction

Except for a check valve, most all valves will allow flow in both directions. Those with flow direction indicators are just made with built-in internal "funnel" construction to increase pressure a bit past the valve.

Mike Swearingen is offline   Reply With Quote
Old 03-04-2008, 08:56 AM   #3
Join Date: Jan 2008
Location: Iowa
Posts: 23

Flow direction

There is no reason for a gate valve to have a flow arrow on it since when fully open its like an open piece of pipe. Globe valves will have flow arrows so that when shut there is no pressure on the stem seals, but will work in either direction.
Grimace is offline   Reply With Quote
Old 03-04-2008, 09:57 AM   #4
Join Date: Sep 2006
Posts: 1,670

Flow direction

The only gate valves I have seen with directional arrows are the cheaply made ones. They didn't want to pay for the engineering to make the gate beveled properly and the surfaces machined to a certain tolerance. By degignating a direction, they only machine one side of the sealing area. Most will work in either direction though. Inside a Globe valve (made for adjusting the flow rate) you will see the inlet "hole" is lower than the outlet hole.
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 03-04-2008, 12:35 PM   #5
Join Date: Nov 2007
Location: Scottsdale, AZ
Posts: 331

Flow direction

Throughout the years, I thought the arrow was there so that AFTER the valve was correctly oriented and installed and in-service, a person could determine at any time what direction the liquid was actually flowing.
End Grain is offline   Reply With Quote
Old 03-04-2008, 01:21 PM   #6
Join Date: Jul 2007
Posts: 16

Flow direction

Thank you guys for all the info on my question.I now know what I wanted to know,thanks again to all you guys
jacob is offline   Reply With Quote
Old 03-04-2008, 02:18 PM   #7
Join Date: Dec 2007
Location: Baltimore, MD
Posts: 1,802

Flow direction

The arrows are usually there when the valve has a drain plug. It allows the user to drain the downstream section of the pipe when the valve is shut off.

jerryh3 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
very low shower head flow rickard681 Plumbing 7 10-08-2008 06:43 AM
Diagram of dual hot water heater (s) in parallel not series having flow questions-- timlltt Interior Decorating 1 02-29-2008 03:01 AM
Laminate on side of steps and direction 83trekker Flooring 4 02-20-2008 03:42 PM
Flow not Pressure problem??? DonM Plumbing 5 11-29-2007 05:53 PM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.