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Problems closing a Larner Johnson Valve

Thread starter ddsancho
Start date Jul 30, 2005

Status: Not open for further replies.

Jul 30, 2005

ddsancho

Mechanical

Hi,

We have a 60" Larner Johnson valve mounted in a 20 meters pipe from free discharge.
Water flow (20m3/s).
Head Pressure 6 bar.

When can only open a 30% !!

We think that the actuator can not win the vacuum that water flow generates outlet the valve.
Outlet the valve there are some entries to let atmosphere air go into. We are thinking to opened some more entries. Any other idea?

Thanks