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EXTERNAL BYPASS VALVE ADJUSTMENT
1.
Remove the seal wire and loosen the locknut (10).
2.
To increase the pressure setting, slowly turn the
adjusting screw (8) inward, or clockwise.
3.
To reduce the pressure setting, slowly turn the adjusting
screw (8) outward, or counterclockwise.
4.
Ensure that there is an appropriate pressure gauge fitted
to Pumps' main discharge viewable while setting the
Bypass Valve.
5.
Rotate the Bypass Adjusting Screw (8) anti-clockwise
until there is no resistance against the screw. This is the
Bypass Valve's minimum pressure setting.
6.
Ensure that the system is set such that 100% of the
Pump's flow is directed through the Bypass Valve
7.
Start the Pump and ensure that liquid is flowing through
Bypass Valve. This should be detectable audibly (by
listening) or by feeling the valve/pipework (by hand).
8.
Screw in the Bypass Valve Adjusting Screw (8) not
exceeding two turns per minute until the desired
differential pressure is reached.
9.
While retaining the Adjustment Screw (8), tighten the
Locknut (10) against the Bypass Valve Cover (2).
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can cause
serious personal
injury.
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury or property damage.
Hazardous pressure
can cause serious
personal injury or
property damage
If pumping hazardous or toxic fluids,
system must be flushed and
decontaminated, inside and out, prior
to performing service or maintenance
Hazardous or toxic
fluids can cause
serious injury.
Failure to relieve system pressure prior
to performing pump service can cause
serious personal injury or property
damage. Systems with meters will still
be pressurized even after the hose is
Hazardous pressure
emptied
can cause serious
personal injury or
property damage
INSTALLATION
10. After setting the Bypass Valve is completed, wire and seal
the Adjusting Screw, using the holes provided in the head
of Adjusting Screw and lug on Bypass Valve Cover.
NOTE:
Bypass Valves characteristically exhibit two distinct
pressures during their operation:
1) The 'setting' or 'cracking' pressure which occurs when the
Bypass Valve first opens i.e. initial bypassing begins against
the preset spring load.
2) 'Maximum' pressure, which occurs when the full flow of the
bypassed product passes through the Bypass Valve.
It is important to ensure both these above characteristics are
understood fully in order to correctly apply the Bypass Valve.
OPERATIONAL CHECKS
Inspect the external Bypass Valve frequently during the first few
hours of operation for such conditions as leaks, excessive
heating, vibration or unusual noises etc.
MAINTENANCE
Maintenance shall be performed by qualified technicians
only. Follow the appropriate procedures and warnings
as presented in this manual.
LUBRICATION
No 'in service' lubrication is required on Ebsray Model RV18
Bypass Valves.
PERIODIC INSPECTION
Periodic Inspection of the Bypass Valve, Pump System and
Ancillary Equipment is required to maintain safety, conformity,
operational functionality and reliability.
Annual inspection and testing of the internal relief valve
(if applicable) and the external bypass valve operation
and setting is recommended.
Maintenance inspections should be performed at a maximum
interval of three months or 500 hours operation. More
frequent inspections may be necessary dependent upon
usage, site conditions, operation, etc.
If any abnormal condition is discovered, cease operation of
pump system immediately and take action to rectify the
problem.
For safe operation, the following items should be included in
the routine periodic inspection:
a.
Inspect the Bypass Valve for leaks, vibration, abnormal
noises, signs of overheating, discoloration, etc.
b.
Check Bypass Valve differential pressure setting.
551-E00
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NOTICE:
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