Ebsray RV Series Guide

Publication # 1910-01
EBSRAY PUMPS
INSTALLATION, OPERATION & MAINTENANCE
INSTRUCTIONS
RV Series
Bypass Valve
Model RV26
EBSRAY PUMPS PTY. LTD
628 Pittwater Road
Brookvale NSW 2100 Australia
Ph: (61 2) 9905 0234
Fax: [phone]
www.ebsraypumps.com.au

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SECTION 1- GENERAL
WARNING NON-COMPLIANCE WITH REQUIREMENTS UNDER THIS HEADING COULD CREATE
CIRCUMSTANCES WHICH MAY LEAD TO PERSONAL INJURY AND/OR WHICH MAY CAUSE
DAMAGE TO THE PUMPSET AND OR ANCILLARY EQUIPMENT
CAUTION
ITEMS UNDER THIS HEADING DRAW ATTENTION TO LEGAL AND/OR STATUTORY
REQUIREMENTS WHICH CONTROL THE INSTALLATION AND USE OF THIS TYPE OF
EQUIPMENT. NON-COMPLIANCE WITH THESE REQUIREMENTS MAY CREATE A
DANGEROUS SITUATION AND/OR RESULT IN DAMAGE TO THE PUMPSET AND
ANCILLARY EQUIPMENT.
NOTE
Items under this heading are to draw attention to assembly procedures, techniques and
methods of operation etc. which are important to ensure correct installation and operation
of equipment and which, if not followed, may result in damage, failure or poor performance
of pumpset and ancillary equipment.
Error! Bookmark not defined.
1.1 - CAUTION
INSTALLATION AND SERVICING OF THESE
VALVES SHOULD BE CARRIED OUT BY
QUALIFIED, COMPETENT PERSONNEL IN
ACCORDANCE WITH RELEVANT STATUTORY
REGULATIONS OR CODES, IN CONJUNCTION
WITH THESE INSTRUCTIONS.
1.2 - WARNING
THESE VALVES MUST BE OPERATED WITHIN
THE ORIGINAL SELECTED DESIGN
PARAMETERS OF PRESSURE, TEMPERATURE,
FLOW AND VISCOSITY. SHOULD ANY CHANGE
BE CONTEMPLATED, PLEASE CONFER WITH
EBSRAY IN ORDER TO VERIFY THE SUITABILITY
OF SUCH A CHANGE.
1.3 TRANSPORTATION AND PACKING
Standard domestic packing is suitable for shipment in
covered transports. Ports must be sealed to exclude
ingress of solids. When received on site the valve
should be stored in a dry covered area.
1.4 INSPECTION ON RECEIPT
On receipt of equipment, check all items against the
dispatch documents and inspect for damage. Any
damage or shortage incurred during transit should be
noted on the packing note and on both your own and
the carrier's copy of the consignment note and a
claim should be made immediately on the transport
company. Should a shortage be evident on receipt,
notify EBSRAY immediately giving full details and
packing note number.
1.5 STORAGE
If storage is required for other than a short period
prior to installation, special preservatives and
protective wrappings will be required.
SECTION 2- INSTALLATION
Ensure pipework is clean before installation. Bypass
Valve must only be installed in accurately aligned
pipework to ensure that pipe stresses are not
transferred to valve housing. The port which is
opposite the Adjusting Screw is the inlet port and the
other port is the outlet port.
The preferred installation orientation is with the
adjusting screw up however the valve may be
mounted in any position as required by the
installation and available space. Ensure that the
adjusting screw is accessible
WARNING
NEVER ALLOW WATER OR
ANY CORROSIVE PRODUCT TO
ENTER THE VALVE AS THIS
MAY DAMAGE THE VALVE AND
WILL VOID THE WARRANTY.

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SECTION 3 - OPERATION
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.
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 the required/specified pump
differential pressure, ensuring that total system
pressure does not exceed regulatory codes or
requirements of equipment installed.
SECTION 4 - MAINTENANCE
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 delivery instructions,
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).
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 quality lubricant before
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).

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c, Apply loctite 620 (High temperature
retaining compound) or equivalent to Spring
Retainer thread.
d, Carefully screw in Spring Retainer (16)
ensuring that Spring (13) enters the bore of
the Spring Retainer (16).
e, Loosen locknut (10) and unscrew bolt or
setscrew from Valve assembly.
2. Fit Locknut (10) to Adjusting Screw (8) and
partially screw Adjusting Screw (8) into Valve
Cover (2). For Gasket sealed versions, screw
Adjusting Screw (8) in to Valve Cover(2) far
enough to allow engagement with Spring Cap 4)
during assembly.
3. Fit Valve (3) into Housing (1), ensuring freedom
of movement.
4. Fit Spring (5) on to top of Valve (3).
5. Fit 'O'Ring (7) or Gasket (17) to Valve Cover (2).
6. 'O'RING SEALED VERSIONS ONLY: Fit
'O'Ring (6) to Spring Cap (4) and fit Spring Cap
(4) onto Valve Cover (2).
7. GASKET SEALED VERSIONS ONLY:
Place Spring Cap (4) on Spring(5).
8. With a new 'O'ring or gasket in place, fit Valve
Cover (2).
4.6 SETTING
NOTE: Final pressure setting is carried out after
the valve is installed or reassembled 'in line'.
Refer to Section 6 for notes on Bypass Valve
setting and operation.
1. For increased bypass pressure, rotate Adjusting
Screw (8) in clockwise direction (i.e. screw in).
DO NOT exceed system design pressure.
2. For decreased bypass pressure, rotate Adjusting
Screw (8) anti-clockwise (i.e. screw out).
3. Lock Adjusting Screw Locknut (10) against
Housing immediately after any adjustment is
made.
4. For Gasket sealed versions, replace Adjusting
Screw Cap with a new Gasket after setting is
completed.
SECTION 5 - PARTS DESIGNATION
Cat # Description Qty Cat # Description Qty
1 Housing 1 9 Setscrew 8
2 Valve Cover 1 10 Locknut 1
3 Valve 1 12* Ball 1
4 Spring Cap 1 13* Spring - Vent 1
5 Spring 1 16* Spring Retainer 1
6* 'O'Ring 1 17* Gasket 1
7* 'O'Ring 1 18 Adjusting Screw Cap 1
8 Adjusting Screw 1 19* Gasket 1
* Items marked with asterisk are not common to all builds of RV26 valves.
Please ensure that parts are identified correctly before ordering.

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SECTION 6 - NOTES ON SETTING AND OPERATION
WARNING SERIOUS INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT MAY OCCUR IF
SYSTEM OR COMPONENT DESIGN PRESSURE IS EXCEEDED. SHOULD THERE BE ANY
DOUBT AS TO THE PRESSURES LIKELY TO BE GENERATED IN THE SYSTEM WITH AN
INOPERATIVE OR INCORRECTLY SET BYPASS VALVE, PLEASE CONTACT EBSRAY FOR
MORE INFORMATION.
NOTE In order to set the bypass valve, a throttling valve must be located in the discharge line
downstream of the bypass valve. A pressure gauge must be installed in the discharge line
between the pump and the throttling valve.
6.1 ADJUSTMENT PROCEDURE
1. First open the throttling valve and any other
valves in the discharge line in order to minimise
the discharge pressure as much as possible.
Failure to do this could cause excessive and /or
dangerous pressures to be generated.
2. Before starting the pump, loosen the locknut on
the bypass valve adjusting screw and screw the
adjusting screw fully in (clockwise). This
increases the tension on the spring and is the
maximum pressure setting for the particular
spring as fitted. [A number of springs are
available to give different pressure ranges]
3. Start the pump and slowly close the throttling
valve (ensuring pump/system maximum
operating pressure is not exceeded) until the
pressure gauge shows expected bypass valve
cracking pressure. (Also called 'set pressure')
Now turn the adjusting screw out (anticlockwise)
until the gauge registers a slight drop in
pressure. At this point the bypass valve has
begun to open ie. cracking. Screw in the
adjusting screw one turn (clockwise) and then
tighten the locknut. The Bypass Valve is now set
6.2 VERIFICATION OF ADJUSTMENT
Re-open the throttling valve. Stop pump then
restart pump. Observe the pressure gauge whilst
again slowly and cautiously closing the throttling
valve. The gauge should register a levelling off
(or reduction) in the characteristic pressure rise
once the bypass valve cracking pressure has
been reached.
6.3 IMPORTANT NOTES
1. The Bypass Valve is only one item controlling
pressure-rise in the bypass system. Other
valves, fittings and pipework downstream of the
bypass valve also cause system resistance, this
may affect maximum system pressure.
2. Bypass valves only control differential pressure -
not total system pressure.
Typical Bypass Valve Characteristics
1 Cracking pressure (set pressure) (Where valve
starts to bypass)
2 Maximum pressure (At the rated operating
parameters)
3 Full flow pressure (bypass) (At the rated
operating parameters)
NOTE: Any pressure rise (or fall) after the cracking
point may depend upon:
a. Flow rate through the bypass valve.
(Excessive pressure rise may signify
restrictions in pipework, fittings etc.)
b. Viscosity of product at pumping temperature.
c. Specific bypass valve design and size.
The graph represents three typical bypass valve
characteristics. Actual performance during operation
will depend on bypass valve design, system design
and may also be affected by the parameters (a. b. &
c.) as listed above.