Return Valve; Flange Connection; Minimum Presure - ITT HXC 501-1 Betriebsanleitung

HXC 501-LXCD 655 20.10.2006
42
8:16 Uhr Seite 42
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4.6 Return valve

If a return valve has been installed, the pump has to be set up
(see point 6.4) so that the pump's minimum delivery pressure
can exceed the valve's closing pressure at any time.

4.7 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.
Use the appropriate screws
for the given nominal pressure PN.
A
PN 6 PN 10 / PN 16
DN 40
DN 50 M 12
DN 65
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 stop slide valve before and after the pump.
This will avoid having to drain and refill the system
if the pump has to be replaced.
4.8 Minimum pressure
At 75 °C, the minimum pressure at the pump intakes for reliable
lubrication of the sleeve bearings:
HXC/LXC
Single pumps
HXC 501
LXC 655
The values apply up to 500 m (1640 ft) above sea level.
Additional pressure for greater heights:
0.01 bar per 100 m (328 ft) additional altitude.
Additional pressure for: 95 °C
PN 6
M 16 Ø 14
HXCD/LXCD
Twin pumps
HXCD 501 0.5 bar Overpressure
LXCD 655 0.6 bar Overpressure
0.45 bar
B
PN 10 / PN 16
Ø 18