USER’S MANUAL V-line 899x.xxx/LPG
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counterpressure of gaseous phase as generated by the spring pushing the differential piston into the valve
seat from the side of the gaseous phase allows to shift the valve cone of the differential piston off the
valve seat so that the flow through the valve is open.
All defects of the valve shall be repaired by a professional labourer.
The cover of the valve is protected by a seal of the producer or the service shop against unauthorised
intervention.
9.3.
Separator
The separator prevents the inlet of the gaseous phase into the meter.
The separator together with a filter, non-return valve, pressure-release valve and a safety valve for the
gaseous phase form one assembly unit.
ATTENTION!
The filter collects impurities for the substance being pumped. In case the discharge drops,
it is necessary to check the filter, clean or replace it.
The cover of the separator filter can be opened when the substance is displaced by
nitrogen!
Identification of areas exposed to the risk of pressure release of residual nitrogen - see
Enclosure No. 8.
The safety valve of the gaseous phase in the upper part of the separator (adjusted to 1,8 MPa) prevents
the exceeding of the highest working pressure by means of by-passing the liquid phase back to the storage
tank.
When pumping is finished, the non-return valve located in
the bottom part of the separator allows the rise of pressure in the meter therefore the substance stays in
the liquid condition.
A pressure-release valve built-in into the piston of the non-return valve protects the meter against
damage by inadmissible pressure of substance due to its overheating in the hydraulic system of the
dispenser. Under critical gauge pressure the pressure-release valve will connect the pipe between the
separator and the meter to the interior of the separator which results in pressure fall in the meter.
ATTENTION!
Only a qualified labourer of the service-shop may be charged with repairs of the separator
assembly and prospective replacement of the filter.
9.4.
Electromagnetic two-stage valve
It is used for two-stage closing of flow when dispensing the preselected volume. The first stage partially
closes the flow to approximately 10 % of the flow rate just before the set value is achieved. The second
stage closes the flow completely. The operation of the two-level stage closing of the valve shall be
followed and prospective defect shall be repaired in time. The closing and the throttling functions are
eliminated in the service mode. The repair is performed by qualified workers. Fixing bolts of the valve
shall be regularly checked and retighten to prevent any liquid leakage.
9.5.
Breakage coupling
The breakage coupling prevents the damage dispensing hose or the dispenser in case the vehicle leaves
without the dispensing nozzle being uncoupled form the vehicle tank filler. The coupling is fitted with
valves stopping gas leakage when both basic components of the coupling are broken. Only a specialist can
carry out the replacement of the broken coupling.
Bending moment, necessary for the breaking of the breaking coupling, is 300 to 600 Nm.
9.6.
Rupture coupling
The rupture coupling prevents the damage of the dispensing hose or the dispenser in case the vehicle
leaves without the dispensing nozzle being uncoupled from the vehicle tank filler. The coupling is fitted
with valves stopping gas leakage when both basic components are disconnected. Only a specialist of the
service shop can connect both disconnected components of the rupture coupling.
Tearing force, necessary for the disconnection of the rupture coupling, is 200 to 500 N.
