Flygt 4901, Flush Valve (En); Product Description - ITT Flygt 4901 Instalación, Servicio Y Mantenimiento

FLyGt 4901, FLUsH VALVe
ITT guarantees that a spare part stock will be kept
for 15 years after the manufacture of this product has
been discontinued.
In accordance with our policy to constantly improve
our products, the specifications contained herein are
subject to continuous change.
The manufacturer reserves the right to alter perform-
ance, specification or design without notice.

PRoDUCt DesCRIPtIon

General
The flush valve is primarily designed to flush and
cleanse a pump sump of sewage water and sludge
by mixing the sewage water automatically before
discharge. At the beginning of each pumping period
the valve is open and water from the pump is forced
through the valve into the sump as a jet flushing
stream. The water in the sump is subjected to a violent
motion and the sludge is stirred into suspension.
The flush valve is mounted on the pump housing and
its design is based on the ejector principle with a ball
as closing device. The operation is automatic and
i nduced by the pump flow and pressure, thus elim-
inating the need for electrical components and
cabling.
Applications
Sewage pumping stations equipped with Flygt pumps.
For installation on 3085–3301, on standard
and explosion proof pumps in a -P installation
arrangement.
The pump housing must be pre-drilled and equipped
with a cast flat for the flush valve connection.
Performance
One flush valve 4901 should be sufficient to handle
the flushing of a pump station with a maximum diam-
eter of 2.1 metres.
Liquid temperature
Max. 40°C.
For minimum temperature, refer to the freezing point
of the oil used in the valve oil casing.
14 Installation, Care and Maintenance Flygt 4901, Flush Valve
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Flushing time
The recommended flushing period for the 4901 is 20
sec. (Can be adjusted by the regulating valve.) The
flush valve is open when the pump starts and closes
after a chosen mixing period. The pump continues
pumping until the shut-off level is reached. The flush
valve opens again at the shut-off level.
Complete unit, flush valve, standard version
(556 51 01)
Black painted valve body.
Closing device
Cast iron ball.
Complete unit, flush valve, special version
(556 51 02)
Blue painted valve body.
Closing device
Polyurethane ball. (For low head applications with
3085 and 3102.)
Weight
Flush Valve (standard version)
Flush Valve (special version)
Limitations
As the operation of the flush valve depends on the
pressure and flow performance of the pump, operation
can be predicted by calculation* in borderline cases.
The lower limits at which the limitations should be
calculated are indicated in the table on the following
page.
The maximum allowable geodetic pump head is 70
metres.
(en)
8.0 kg
7.4 kg