4. OPERATION AND MAINTENANCE
©2014 Kraus Global Ltd.
Retail CNG Dispenser Manual
39
4.4.2
KAF 402™ solenoid inlet valve
Kraus’ KAF 402™ solenoid valve has been specifically engineered for
high-pressure CNG service. It is constructed of materials suitable for
use with natural gas and is rated for a burst pressure in excess of
25,000 psi.
To ensure the proper solenoid valve(s) are in proper working
condition please observe the following maintenance guidelines:
The valve(s) must be leak-tested after
every 35,000 cycles or every six months,
whichever comes first.
The valve(s) must be rebuilt at least once
every three years by qualified service
personnel and in accordance with the
rebuild procedure described in the KAF
402™ rebuilding specification sheet.
ATTENTION
Rebuild kits are required to properly rebuild
KAF 402™ solenoid valves
for any maintenance or reparation purposes. They are sold separately
from any dispenser systems; please contact our sales or technical
support department at 204-663-3601, ext. 212, for any questions.
4.4.3 Inline filters
CNG filtering is a balanced, continuous, and steady state condition
occurring at or below rated flow. In order to maintain high-efficiency
filtration for your CNG dispenser, ensure that the bowl is kept clean
and free of waste build-up.
Filter element replacement procedure
1.
Ensure the dispenser is completely vented – SEE Section 4.3.2.
2.
Open the filter drain valve to ensure all pressure has been
vented.
3.
Unthread and remove the bowl—set it aside in a secure location.
4.
Remove and discard used filter element and O-ring.
5.
Install new filter element.
6.
Install new O-ring. Lightly lubricate the new O-ring using a clear
silicon-based grease.
7.
Apply a thin layer of anti-seize onto the filter bowl threads.
8.
Thread the filter bowl to the head, making sure not to pinch O-
ring.
