Description
Product recirculation from seal chamber to pump suction via a flow control orifice.
Features
1. Provides continuous vent for vertical pumps.
Use
1. Wherever Plan 11 is not usable due to low-pressure margin between discharge and seal chamber pressure.
2. Used in vertical pumps.
Caution
1. Check margin between seal chamber pressure and suction pressure.
2. Orifice size should be at least 1/8” (3.2mm).