BLACKMER IOM E Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 12 / 52

1901-a00 12
INTERNAL COOLING CIRCUIT
This pump has an internal cooling circuit that circulates some of the pumped fluid through the magnet chamber. The circuit starts at
the discharge port and ends at the suction port. This circuit has three functions:

Cool the inner magnets

Keep fluid in the magnet area from becoming stagnant
 Lubricate and cool the rotor and idler bushings
NOTE: Consult factory at low differential pressures to ensure proper cooling-path circulation.
There are special plugs in the casing and head that must be in the correct position to complete the circuit:
1. The casing needs to be vented on the DISCHARGE side. In some cases, this is done with an orifice plug that has a hole
in it, positioned in the casing hole behind the DISCHARGE port. In other cases, this is done by leaving the casing hole
behind the DISCHARGE port open.
2. The casing block-off plug is solid (no hole). It belongs in the casing hole behind the SUCTION port.
3. The head block-off plug is solid (no hole). It is only used in pumps that have no relief valve, and it belongs in the head
hole on the DISCHARGE side.
4. On pumps with an integral relief valve, the orifice plug hole is located at the bottom of the pilot hole for the spindle in the
head plate. This applies for pump sizes E1-2 to E1-82 only. There are no "head block-off" holes or ports needing to be
changed when switching the rotation (Figure 2), only the casing. The orientation of the relief valve must be rotated 180
degrees so that the spring/poppet portion of the valve is closest to the discharge port.