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The EBSRAY Model RV26 BYPASS VALVE is a
spring actuated pump and system protection device
that by design cannot be positively shut-off. With the
VRS option, It also provides for controlled and rapid
'bleed-off' of vapour. This enhances the self priming
capabilities of the pump. The valve is installed in the
pump discharge system and normally returns flow to
the supply vessel.
PRIOR TO ANY DISASSEMBLY OR SERVICE, VERIFY THAT ALL REQUIREMENTS OF STATUTORY
REGULATIONS OR CODES ARE MET AND THAT SPECIFIC SITE REQUIREMENTS ETC ARE SATISFIED.
Apart from Housing replacement, other maintenance
tasks and inspections can be carried out with the
valve 'in line', so long as complete isolation,
depressurising and purging have been completed.
4.1 SPARE PARTS
1.
When ordering spare parts, to ensure correct
replacement to original specification, always
quote valve Serial Number, which is located on
the nameplate of the valve. Please advise if
valve has been upgraded with VRS option
original supply from EBSRAY.
2. Advise the name, item number and quantity
required. Refer to Drg CMP112.
3.
Advise
complete
transportation, etc.
4.2 PREPARATION FOR DISASSEMBLY
1.
Obtain the appropriate Work Permit if required.
2.
Isolate valve from liquids/vapour in suction and
discharge lines, depressurise and purge out any
toxic, flammable, corrosive or air hardening
liquid/vapour.
3.
Ensure the associated pump motor power supply
has been isolated, before proceeding with the
valve disassembly.
4.3 DISASSEMBLY
1.
Remove Adjusting Screw Cap (18) (Gasket
sealed version only)
2.
Unlock Adjusting Screw Locknut (10).
3.
Release all spring pressure by rotating Adjusting
Screw (8) anti-clockwise.
4.
Remove Valve Cover (2) from Housing (1).
5.
Remove components from Valve cover (2) and
Housing (1).
SECTION 3 - OPERATION
SECTION 4 - MAINTENANCE
delivery
instructions,
The RV26 Valve is available in various configurations
including 'O'Ring sealed or Gasket sealed versions,
with or without the 'VRS' (Vapour Removal System)
option.
On commissioning, the bypass valve must be set in
accordance
with
differential pressure, ensuring that total system
pressure does not exceed regulatory codes or
requirements of equipment installed.
6.
OPTIONAL VRS ONLY: If disassembly is
necessary, the Ball (12) and Spring (13) will
have to be replaced as heat is required to break
the bond between the Spring Retainer (16) and
the Valve (3).
To disassemble:
a,
Screw a bolt or setscrew (M12) into Spring
Retainer (16) and lock in position with a
locknut (10).
b,
Apply heat to the Valve (3) until the Spring
Retainer (16) can be unscrewed from the
Valve (3).
c,
Remove the Spring Retainer (16), Spring
(13) and Ball (12) from the Valve (3).
4.4 INSPECTION
1.
Inspect Housing and Valve seat for damage or
wear. If required, remove Housing and replace.
2.
Check all components for for damage or
deposits, clean thoroughly, replace if broken or
damaged.
3.
It is advised that 'O'rings and Gaskets be
replaced at every overhaul.
4.
OPTIONAL VRS ONLY:
Check condition of Ball (12), Spring (13) and
Spring Retainer (16). Replace as required.
4.5 REASSEMBLY
(Refer drawing No CMP112).
NOTE: Lightly smear all 'O' rings with a
compatible
good
assembly.
1.
OPTIONAL VRS ONLY:
NOTE: To facilitate assembly, screw a bolt or
setscrew (M12) into Spring Retainer and lock in
position with a locknut.
a.
Insert Ball (12) into Valve (3).
b,
Position Spring (13) on Ball (12).
3
the
required/specified
quality
lubricant
pump
before
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