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HYDRAULIC COMPONENTS
Manual ball valve
The manual ball valve is on the dispenser inlet and prevents the entrance of natural gas in the dispenser itself
during any maintenance operations.
This valve is normally installed on a system when a dispenser is also installed.
Particulate filter
The particle filter is on each inlet line of the dispenser and its function is to separate any solid particles from
the compressed natural gas in order to optimize gas flow and avoid particle deposits in the internal
components.
Check valve
The check valve's function is to prevent gas flow in the opposite direction of dispensing.
Mass-flow meter
The CNG dispensers are equipped with mass-flow meters that rely on the Coriolis effect. The mass-flow
meter measures the quantity of gas dispensed and communicates with the electronic head.
Coriolis effect: a force apparently due to the speed of rotation of a non-inertial reference system
compared to an inertial reference system; it is equal and opposite to the product of the mass of
particles on which it acts and the relative Coriolis acceleration
For operating characteristics and more information regarding the mass-flow meter, refer to the specific
technical manuals.
Motorized valve
The motorized valve includes a ball valve, a solenoid and a pneumatic actuator.
When the dispensing selector is switched to the ON position (dispensing), the head sends a command to the
solenoid, which activates the inlet of compressed air into the actuator through the inlet door; at this point the
ball valve opens and the gas starts to flow.
The motorized valve returns to its initial position when the head sends the inverse command to the solenoid,
which activates the inlet of compressed air through the outlet door; in this case the ball valve closes and the
flow of the gas stops.
Pressure gauge
The CNG dispenser has a pressure gauge with a scale division from 0 to 400 bar, which allows a constant
monitoring of gas pressure.
Delivery hose
The CNG dispenser's filling hoses are specifically designed and manufactured to supply natural compressed
gas.
The hoses are wear proof and are high-performance.
There are twin hoses for dispensing and venting.
Standard hoses have an internal diameter of ¼ inch (standard flow) or ½ inch (high flow)
Delivery Nozzle
The CNG dispenser has nozzles capable of satisfying all the requisites of efficiency and safety related to
CNG fuelling.
Generally there are two types of nozzles, for light vehicles (used to fuel automobiles, vans and small trucks)
or nozzles for heavy vehicles (used to fuel buses and trucks). However, there are different nozzles, according
to the characteristics required by different CNG systems (Italy type, NGV1 type, NGV2 type etc).
© Copyright
2008-03-20 V0 Rev.01.0
- 18 -
WT004139
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