Flowserve Uniseal Series BW Seals - Manual (Page 6)

For Plans 52 and 53:
Shaft Rotation Inlet Outlet
(from exposed end of gland)
Clockwise (CW) Port b Port a
Counterclockwise (CCW) Port a Port b
3.4 For dual pressurized seal (double seal) operation, supply a clean,
compatible barrier fluid at a pressure at least 1.7 bar (25 psi) above the
seal chamber pressure. See Figure 8. The pressure of the barrier fluid
must not exceed the recommended maximum pressure.
Dual pressurized (Plan 53A) Uniseal with Supply Tank Figure 8
CW
Rotation
F
F
V
CCW Rotation
a b
3.3 For dual seals, follow the port
connections listed below, see Figure 7.
Uniseals are unidirectional and piping
the correct inlet and outlet is important
to proper circulation. The liquid barrier
inlet should draw from the bottom of the
support system while the liquid barrier
outlet feeds the top of the system. After
venting, plug the vent port.
6
Dual seal port connections
Figure 7
Image is not to scale