BLACOH F
LUID
C
ONTROL
, I
NC
.
4
I
NSTALLATION
N
OTES
Dampening of flow pulsations can only be effective if 5 to 10 psi (0.4 to 0.7 bar) back pressure
downstream of dampener is available. A BLACOH back pressure valve may be required downstream of
dampener.
It is recommended that a BLACOH pressure relief valve be installed in all pump systems to ensure
compliance with pressure limits on system equipment.
To avoid possible damage to bladder/bellows from a system pressure test, do the following:
Adjustable
and Chargeable models
— charge dampener to 80% of the sy
stem test pressure prior to test.
Automatic models
— dampener must be equipped with a constant source of compressed air prior to test;
connect a compressed air line and dampener will pressurize itself.
Install dampener in-line, as close to the pump discharge/inlet or quick closing valve as possible.
Dampener installation should be no more than ten pipe diameters from pump discharge/inlet or quick
closing valve.
It is recommended that an isolation valve be installed between the dampener and system piping.
ATEX S
TANDARD
Certain models made for the European market comply with the ATEX standard for use in potentially
explosive atmospheres. These models have the AT designation at the end of the part number and comply
with EC standard EN-13463-5 with protection degree of II 2GD TXC. AT models have a grounding lug
and must be grounded (earthed) before operation.
M
AINTENANCE
Remove all pressure from dampener AND pumping system before disassembly, removal or maintenance.
Dampeners require very little maintenance. There is only ONE wear part – the elastomeric bladder or the PTFE
bellows. There is no need for lubrication.
Elastomeric bladder replacement should be part of a preventive maintenance program. Dampeners used in
conjunction with diaphragm pumps should have the bladders replaced at least every second time the diaphragms
in the pump are replaced. As with any pumping system, wear is dependent on many factors including material,
temperature, chemicals, fluid abrasiveness and system design. This suggested maintenance program may need
to be adjusted according to specific applications.
Periodic inspection of the dampener and fasteners should
be conducted to visually check for signs of over-
pressurization, fatigue, stress, or corrosion. Body housings and fasteners must be replaced at first indication of
deterioration.
C A U T I O N ! Replace nut and bolt fasteners on metal models at each re-assembly with fasteners
of equal grade/strength value. DO NOT re-use old nuts and bolts.
After the initial torque of fasteners, bo
lts will usually lose up to 20% of their strength when re-torqued. Failure to
replace both nuts and bolts upon each vessel reassembly will void the product warranty given by Blacoh Fluid
Control, Inc. and Blacoh Fluid Control,
Inc. will have no liability whatsoever for any vessel failure or malfunction.
Where dampeners are used in corrosive environments, nut and bolt fasteners should be regularly inspected and
replaced with nut and bolt fasteners of equal grade/strength value if corrosion
is observed. Failure to conduct
such regular inspections and replacement will void the
product warranty given by Blacoh Fluid Control, Inc. and
Blacoh Fluid Control, Inc. will have no liability
whatsoever for any vessel failure or malfunction.
I M P O R T A N T ! AFTER MAINTENANCE OR RE-ASSEMBLY OF METAL MODELS, USE NEW
FASTENERS AND TORQUE FASTENERS ACCORDING TO SPECIFICATION ON DAMPENER TAG.
DO NOT
use dampener if the fasteners (nuts and bolts) are corroded. Check for fastener corrosion
frequently, especially in atmospheres containing salt or corrosive chemicals, or if dampener leakage has
occurred.
