Why turn valve handle back a half turn from fully seated position.
Why turn valve handle back a half turn from fully seated position.
(OP)
Why is it good industry practice to turn a valve handle back a half a turn from the fully seated position?





RE: Why turn valve handle back a half turn from fully seated position.
What makes you believe that turning a valve handle back half a turn from the fully seated postion is good industry practice?
It also probably depends on the type of valve. For example, with a ball valve that only has 1/4 turn from fully open to fully closed, I can't believe such practice is recommended.
rp
RE: Why turn valve handle back a half turn from fully seated position.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Why turn valve handle back a half turn from fully seated position.
RE: Why turn valve handle back a half turn from fully seated position.
He assumed that the tank valve was stuck closed.
So he got out a pipe wrench to open it.
Of course, the tank was empty, and the valve was full open and backseated.
The valve is still backseated and the tank is empty, and nobody can close the valve.
I don't know about an industry rule, but I've adopted the habit of fully seating (globe) valves to close them, as is required, and of slacking them away from the backseat a bit after opening them fully. So I can grab the valve handle and know instantly that it's open if it moves easily, and it's most likely closed if it doesn't move easily.
WRT a gate valve, I wouldn't back off the wheel after seating the valve in the closed position, for fear that the gate might wiggle loose later, but I would slack the wheel after backseating the valve in the open position, again just so I can easily distinguish open|closed|stuck.
Mike Halloran
Pembroke Pines, FL, USA
RE: Why turn valve handle back a half turn from fully seated position.
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RE: Why turn valve handle back a half turn from fully seated position.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Why turn valve handle back a half turn from fully seated position.
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