Flowserve BB 1 - Manual (Page 12)

2
Installation
Springs
Note
Installing a dual-plate check valve with spring type “ 5 VO” in horizontal lines or vertical
lines with upward flow may result in loud noises, scuffing and subsequent wear on the
seat.
BB 1..., BB 2...
. Please note our installation recommendations on page 6.
2. Clean plate seats.
3.
Horizontal flow: Insert flange bolts through bottom flange bore and tighten nuts.
Use off-the-shelf seals.
4. Mount and align dual-plate check valve BB, making sure that the eyebolt B is on top.
Insert and tighten flange bolts.
5. Vertical flow: Insert commerical grade seals (bottom).
6. Mount and align dual-plate check valve BB. Insert off-the-shelf seals (top). Insert and tighten flange
bolts.
The dual-plate check valve BB ..., BB 2... with standard springs may be fitted in horizontal pipework
or in vertical pipework with upward flow. For downward flow special springs are required. For more
information refer to our data sheet “Dual-Plate Check Valve BB”.
Spring “7 WA”
Spring for 7 mbar opening pressure, suitable for horizontal installation or vertical installation with
upward flow.
Spring “2 WA”
Spring for 2 mbar opening pressure, suitable for horizontal installation or vertical installation with
upward flow.
Spring “5 VO”
Spring for 5 mbar opening pressure, suitable for vertical installation with downward flow. These
springs are also suitable for horizontal installation, opening pressure 20 mbar.
Danger of severe injuries, death and destruction caused by the explosion of explosive
gas-air mixtures.
An electrically insulated installation between pipe flanges can cause static electricity.
If the equipment is to be installed in explosion-risk areas, appropriate measures have to
be taken in order to discharge static electricity (earthing)!
Danger