oventrop Oilstop V Notice D'utilisation page 40

Oilstop V anti-siphon valve
Installation
The valve has female threads G 3⁄8 and is suitable for Oventrop
compression fittings.
Connection options:
•
Oventrop brass compression fittings for 6, 8, 10 or 12 mm pipe, item
no.: 212705_ (see Accessories)
•
The threads are designed according to DIN 3858.
Screw-in fittings with short thread R 3⁄8 can also be sealed in.
f
Size the suction pipe according to DIN 4755.
Sizing of the suction pipe according to DIN 4755
The DIN 4755 standard recommends a flow velocity of 0.2 to 0.5 m/s
for suction pipes.
Air may be dissolved in the heating oil. If there is negative pressure in
the upper parts of the suction pipe, the air can outgas together with
volatile oil components. These air bubbles must be transported evenly
to the burner. They can accumulate in pipes that are too large. If a large
surge of air then reaches the burner, it can switch to malfunction.
For one pipe systems, the volume flow of heating oil corresponds to
the quantity of burned oil (approx. 1 litre/hour per 10 kW heating
output).
For two pipe systems, the output of the burner pump is to be taken
into account.
Formula for the flow velocity w in m/s:
w = 0,3537 * V/D
with
V = Volume flow of heating oil in l/h
D = Inner diameter of the suction pipe in mm
Pipe diameters smaller than 4 mm are not recommended.
The suction pressure should not exceed 0.4 bar.
f
Mount the product in the suction pipe above the max. liquid level. Observe
the flow direction (see Illust. 2 on page 35).
The setting scale must be easily accessible.
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210420384-V02.08.2021