Return Valve; Flange Connection; Minimum Pressure - Biral A 402 V2 KW Instrucciones De Instalación Y Funcionamiento

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4.5 Return valve

If a return valve has been installed, the pump has to be set up
(see point 7.2) so that the pump's minimum delivery pressure
can exceed the valve's closing pressure at any time.

4.6 Flange connection

The pump flanges are bored with fixing holes PN6 / PN10 / PN16.
The plain washers «B» provided are to be installed
on the pump side to ensure that the flanges are securely fastened.
Safety elements (such as spring lock washers)
Warning
are not admissible.
Special seals and screws must be used
Warning
for PN 10/16.
Use the appropriate screws
for the given nominal pressure PN.
PN 6
DN 40
DN 50 M 12
DN 65
DN 80 M 16
Admissible screw torque:
for M 12 < 40 Nm
for M 16 < 95 Nm
The installation of combination flange
with combination flange is not admissible.
Install the sluice gate before and after the pump.
This prevents the fluid from being drained and refilled
when the pump is exchanged.

4.7 Minimum pressure

The minimum pressure in the pump connection at –10 °C ... 75 °C
to ensure lubrication of the friction bearings:
Single pumps
A 402/402-1 V2 KW
A 501 V2 KW
A 502 V2 KW
A 651 V2 KW, 651-1 V2 KW
A 652 V2 KW
A 801 V2 KW
The values apply up to 500 m above sea level.
Additions for higher altitudes:
0.01 bar per 100 m of altitude
Addition for:
A
PN 10 / PN 16 PN 6
M 16 Ø 14
M 16
Twin pumps
AD 402-1 V2 KW
AD 501 V2 KW
AD 502 V2 KW
AD 651 V2 KW
AD 652 V2 KW
95 °C
B
PN 10 / PN 16
Ø 18
– –
0,4 bar overpressure
0,2 bar overpressure
0,2 bar overpressure
0,35 bar overpressure
0,35 bar overpressure
0,35 bar overpressure
+ 0,45 bar