2 | Product Description
8 | 36
Instruction Manual Supplement DOLPHIN VL Systems_EN_en
2.2
VL System Description
The VL system description is written on the system’s nameplate. It is defined as in the following ex-
ample:
VL 0320 A T K O ZE M X
1
2
3
4
5
6
7
8
9
Description
1
VL = Compact liquid ring vacuum sys-
tem
2
Size of the vacuum pump
3
Design status of vacuum pump
4
M = Single stage (LM) vacuum pump,
T = Two stage (LT) vacuum pump
5
K = Cast iron construction / 316 stain-
less steel,
M = 316 stainless steel throughout
6
O = Once through liquid system,
P = Partial recirculation liquid system,
T = Total recirculation liquid system
(plate heat exchanger),
S = Total recirculation liquid system
(shell and tube exchanger)
7
Motor reference
8
M = Standard seals (Viton),
P = Chemical seals (PTFE/FFKM seals
and elastomers)
9
X = System suitable for non-hazardous
area,
E = ATEX system
2.3
Start Controls
The machine comes without start controls. The control of the machine is to be provided in the
course of installation.
2.4
Control Concept
2.4.1
Once Through Operation
Operating liquid is continuously supplied to the system whilst it is operating via the inlet pipe. The
process gas and operating liquid are discharged from the vacuum pump together into the separator
vessel (SV) where they are separated. The gas leaves through the discharge connection and the op-
erating liquid through the operating liquid outlet connection at the bottom of the separator.
At the operating liquid inlet the Y-strainer (ST) prevents particles greater than 0.1 mm entering the
vacuum pump.
The pressure reducing valve (PRV) reduces the operating liquid supply pressure to 1 bar(g) maxi-
mum. The solenoid valve (OPV) is linked in to the site control (provided by others) to open and close
with the start and stopping of the vacuum pump to prevent flooding the vacuum pump when
stopped.
