Flowserve BB 1 User Manual
GESTRA Steam Systems
BB 1...
BB 2...
BB 1... ASME
BB 2... ASME
Installation and Maintenance
Instructions 810677- 03
Dual-Plate Check Valves BB 1..., BB 2...
Dual-Plate Check Valves BB 1... ASME, BB 2... ASME
1
2
Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Pressure Equipment Directive (PED) ........................................................................................................4
ATEX (Atmosphère Explosible) .................................................................................................................4
Explanatory Notes
Scope of supply ......................................................................................................................................5
Description .............................................................................................................................................5
Function .................................................................................................................................................5
Technical Data
Corrosion resistance ...............................................................................................................................6
Sizing .....................................................................................................................................................6
Name plate / marking .............................................................................................................................6
Design
BB 1... ....................................................................................................................................................
BB 1... with dampers ..............................................................................................................................8
BB 2... ...................................................................................................................................................9
BB 2... with dampers ............................................................................................................................10
Key .......................................................................................................................................................11
Installation
Danger .................................................................................................................................................12
Springs .................................................................................................................................................12
BB 1..., BB 2... .....................................................................................................................................12
BB 1... with dampers, BB 2... with dampers ..........................................................................................13
Examples of installation ........................................................................................................................14
Commissioning
BB 1..., BB 2... (with dampers) .............................................................................................................15
Operation
BB 1..., BB 2... (with dampers) .............................................................................................................15
7
Contents – continued –
Page
Maintenance
Danger .................................................................................................................................................16
BB 1... Changing springs and O-rings .............................................................................................16, 17
Tools ....................................................................................................................................................17
Danger .................................................................................................................................................18
BB 2... Changing springs ................................................................................................................18-20
Tools ....................................................................................................................................................20
Torques .......................................................................................................................................... 21-23
Spare Parts
Spare parts list ..............................................................................................................................24, 25
Decommissioning
Danger .................................................................................................................................................26
Disposal ...............................................................................................................................................26
Annex
Declaration of Conformity .....................................................................................................................27
3
4
Important Notes
Usage for the intended purpose
BB 2, BB 1, BB 2 with dampers, BB 1 with dampers:
The swing and dual-plate check valves ensure unidirectional flow in pipes by preventing a backflow
of liquids or gases.
Use this equipment only within the specified pressure and temperature ratings and check corrosion
resistance and chemical suitability for the application in question.
Safety note
The valve must only be installed and commissioned by qualified staff.
Maintenance and service work must only be performed by adequately trained persons who have a
recognised level of competence.
Danger
The valve is under pressure during operation.
When loosening flanged connections or sealing plugs, hot water, steam, corrosive liquids
or toxic gases may escape. This presents the danger of severe burns and scalds to the
whole body or severe cases of poisoning.
Installation and maintenance work should only be carried out when the system is
depressurized.
The valve becomes hot or extremely cold during operation. This presents the risk of
severe burns to hands and arms. Installation and maintenance work should only be
carried out at room temperatures.
Sharp edges on internals present a danger of cuts to hands. Always wear industrial
gloves for installation and maintenance work.
Pressure Equipment Directive (PED)
The equipment fullfills the requirements of the Pressure Equipment Directive PED 97/23/EC. BB...C and
BB...A for applications with fluids of group 1 and 2; BB...G for applications with fluids of group 2.
With CE marking (apart from equipment according to section 3.3).
ATEX (Atmosphère Explosible)
The equipment does not have its own potential source of ignition and is therefore not subject to the
ATEX Directive 94/9/EC.
The equipment can be used in potentially explosive areas 0, 1, 2, 20, 21, 22 (1999/92/EC).
The equipment is not Ex marked.
Explanatory Notes
Scope of supply
BB 1...
1 Dual-plate check valve type BB 1...
1 Installation manual
BB 2...
1 Dual-plate check valve type BB 2...
1 Installation manual
BB 1... D
1 Dual-plate check valve type BB 1... with dampers
1 Installation manual
BB 2... D
1 Dual-plate check valve type BB 2... with dampers
1 Installation manual
Description
Swing and dual-plate check valves BB feature two separately suspended semi-circular plates pivoting
on an independent hinge pin. The two plates open and close automatically allowing fluid to flow
in one direction only. The opening pressure and closing time can be customized by modifying the
spring characteristic. Hydraulic dampers are also available as optional extras to solve waterhammer
problems. Installation in any position, with due regard to our installation recommendations. Our
dual-plate check valves are fitted with eyebolts for easy installation and transit protection.
Please note that dual-plate check valves should not be used on reciprocating compressors, piston
pumps or where pulsating flow exists.
Function
The low opening pressure of the dual-plate check valves is a function of the spring characteristics.
When the opening pressure is reached the hinge sides of the plates open first, thereby eliminating
any possibility of the seats scuffing. As the pressure and flowrate rise, the opening angle increases
symmetrically. Media entering the valve at an unfavourable angle (e. g. due to pipe bends) may cause
an asymmetrical opening of the plates. If centrifugal pumps are installed upstream of the valve it
becomes necessary to arrange for a defined stabilizing section. Systems where pulsating flow exists
require specially designed dual-plate check valves. Make sure to install valves that are not fitted with
springs in a vertical position with upward flow. Please note the installation recommendations outlined
in the following pages.
5
6
Technical Data
Corrosion Resistance
When used for its intended purpose the safe functioning of the valve will not be impaired by corrosion.
Sizing
The valve body must not be subjected to sharp increases in pressure. The dimensional allowances for
corrosion reflect the latest state of technology.
Name Plate / Marking
For pressure & temperature ratings see indication on trap body (DN 50 – DN 125) or specification on
the name plate (DN 150 to DN 1200).
According to EN 19 the following indications are stated on the name plate:
■ Manufacturer’s brand
■ Type designation
■ Pressure class PN or Class
■ Material number
■ Max. temperature
■ Max. pressure
■ Stamp on valve body, e. g. specifies the quarter and the year of production
(Example: 4
th
quarter 2004).
4
04
Name plate BB... DN 150 to DN 1200
Direction of flow
Text on valve body BB... DN 50 to DN 125
Direction
of flow
Item number
Designation
Materials
facturing
date
Size / nominal
pressure
Designation Size / Nominal pressure
Materials
Max.
pressure
Item
number
Min.
temperature
Notified bodyManu-
Max. pressure / temperature
Min. pressure / temperature
Notified body
Design
BB 1...
H
I
I
J
G
J
G
E
F
A
E
A
B
A
C
D
Fig. 1
H
7
8
Design – continued –
BB 1... with dampers
J
J
G
A
E
A
B
C
D
H
I
Fig. 2
I
H
G
E
F
A
M
Design – continued –
BB 2...
G
H
I
I
H
L
J
J
K
F
D
B
C
Fig. 3
G
L
K
9
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