Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 25)

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- The relief valve is now set.
For Integral Relief Valve with Manual Lift - see Fig 12.
- To operate the manual lift, turn the handwheel (111) clockwise which will
lift the valve head (102/128). To resume normal operation turn the
handwheel (111) counter-clockwise.
For Integral Relief Valve with Air Lift - see Fig 13.
To actuate the air lift connect an air supply not exceeding 105 psi for S1,
S2, S3 and 150 psi for S4 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 Fig 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 3.4.
- Using the regulating valve gradually increase the air pressure until
required pressure relief setting is reached. The air pressure must not
exceed 105 psi S1, S2, S3 and 150 psi S4.
- The relief valve is now set.
- S4 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.
WARNING