31
www.XSscuba.com
XS Scuba Valves Service Manual
S
ymptom
p
oSSible
C
auSe
S
olution
Air leak between stem(7)
and bonnet(10)
Bad stem o-ring(8)
Replace o-ring(8)
Bent stem(7)
Replace stem(7)
Air leak between
bonnet(10) and the valve
body
Bonnet o-ring(17) damaged or not seated
properly
Replace bonnet o-ring(17)
Bonnet(10) not torqued to proper setting
Apply torque of 30 lbs*ft (420 kg*cm) (40 N*m)
Air leak from valve outlet
when valve is closed
Worn valve seat(5)
Replace valve seat(5)
Debris or particulate matter on the valve seat /
crown orifice interface
Remove valve seat(5) and blow compressed
air into valve inlet as well as the valve seat
chamber
Damaged crown orifice
Replace the entire valve as it cannot be
repaired
Air leak between valve
outlet and regulator first
stage
K or PRO valve - Outlet o-ring damaged or
improperly seated
Replace the valve’s outlet o-ring
DIN valve - DIN connector o-ring on regulator
damaged
Replace the regulator’s DIN connector o-ring
The inlet boss on the regulator is damaged,
either out-of-round, or slightly compressed on
one side. This happens when a tank falls over
and the first stage is attached to it.
Replace the regulator first stage
Air leak from safety
assembly(1)
Bad copper sealing gasket on the safety
assembly(1)
Replace the safety assembly(1)
The wrong safety assembly(1) is being used
Only safety assemblies originating from
XS Scuba / Sea Pearls will work in Thermo
Valves.
Safety assembly(1) not torqued to proper
setting
Apply a torque of 100 lbs*in (115 kg*cm)
(11 N*m)
Damaged seating surface inside valve body
Relace the entire valve. Cannot be repaired.
Air leak between valve
and cylinder
Valve not torqued to proper setting
Apply torque of 50 lbs*ft (690 kg*cm) (68 N*m)
O-ring(3) not lubricated
Lubricate o-ring
O-ring(3) damaged
Replace o-ring(3)
O-ring sealing surface on cylinder dirty,
corroded or damaged.
On aluminum cylinders only, refinish o-ring
sealing area with the TL101 Tank Tool
(see XS Scuba)
Troubleshooting Guide
