Zanotti un0 080 - Non Return Check Valves; Check Valve Test

54
Cooling Circuit
3.3 Valves
(d) Unscrew coil fixing nut or seeger ring and
rem
o
ve solenoid coil from valve.
(e) Disconnect YK valve from copper tubes
with soldering
flame.
(f) Clean pipe ends with a special brush and
blow with dr
y nitrogen.
CAUTION
! Never blow with normal air, it
contains to
o much humidity.
(g) Place new valve in position.
CAUTION
! Using test coil check valve
operativity before.
CAUT
ION
! Pay attention to valve flux
directi
on.
(h) Braze new valve
(i) Vacuum unit.
(j) Respect a waiting time and check for leaks.
(k) Charge refrigerant 3.2.4 Section.
Non return Check Valves
Non return Check Valve is a valves that allows
fluid to flow through it in one direction only,
thus equalization is permitted just in one-way.
Check Valve Test
(a) Connect a pressure gauge to service port before check valve in object and another one to service port after.
(b) Recover refrigerant according procedure of 3.2.2 Section.
(c) Close shut-off valve after liquid receiver and remove YK capacity control valve coil.
(d) By service port after increase pressure to test valve efficiency.
(e) Check that pressure are not equalizing.
(f) Vacuum unit according procedure of 3.2.3 Section.
(g) Charge refrigerant according procedure of 3.2.4 Section.