Viking SLAL - Manual (Page 9)

fIGURE 10
108
107
fIGURE 11
108
129
111
107
102
128
SECTION TSM 288 ISSUE A PAGE 9 OF 36
For Integral Relief Valve with Manual Lift - see Figure 11.
• To operate the manual lift, turn the hand wheel (111)
clockwise, which will lift the valve head (102/128). To
resume normal operation turn the hand wheel (111)
counter-clockwise.
For Integral Relief Valve with airlift - see Figure 13.
• To actuate the air lift connect an air supply not exceeding 7
Bar for SLA -E and 10 Bar for SLF to the cylinder (123) which
will lift the valve head (112). To resume normal relief valve
operation, exhaust the Cylinder (123).
3.8.2 sETTING aNd OPERaTING aIR
lOadEd ValVE
See Figure 14.
• Connect an air supply, via a regulating valve to the relief
valve connection A in the cylinder (114). Do not turn on the
air supply.
• Start the pump, refer to section 3.5.
• Using the regulating valve gradually increase the air pressure
until required pressure relief setting is reached. The air
pressure must not exceed 7 Bar SLA - E and 10 Bar SLF.
• The relief valve is now set.
• slf Only - If the valve assembly is
disassembled, e.g. for maintenance or
repair, it is necessary to apply a thread
locking compound (loctite 270 or similar)
to the piston retaining screw (120).
NOTE: Care should be taken not to exceed the lower of
either the pumps maximum pressure rating or the system
design pressure.
• To use the air lift system the regulated air supply must be
routed through a change over valve in order to transfer
air from the relief valve load air chamber, connection A,
to the lift air chamber, connection B while depressurizing
the load chamber and vice versa. The change over valve
will actuate the air lift which will lift when the air supply is
diverted to connection B, and will close, restoring normal
relief valve operation, when the air supply is diverted back
to connection A.
Spring Loaded Integral Pressure Relief Valve
SLA – E Typical.
Spring Loaded Integral Pressure Relief Valve with Manual Lift
SLA - E Typical.
WaRNING
daNGER !
Under no circumstances should any
attempt be made to dismantle a pressure
relief valve which has not had the spring
pressure relieved, is still connected to
a pressurized air supply, or is mounted
on a pump that is operating. serious
personal injury or pump damage may
occur.
! !