Pulsation Dampers - ProMinent alpha General Operating Instructions

Schematic:
Diaphragm-type pulsation damper
p p p
0 1 2
V V V
0 1 2
2 3
1
p =
Gas filling pressure
0
p =
Minimum operating pressure
1
p =
Maximum operating pressure
2
V =
Effective gas volume
0
V =
Gas volume at p
1 1
V =
Gas volume at p
2
2
V = Change in volume for
pulsation compensation
fig. 38
ProMinent ProMinent
® ®
9.3

Pulsation Dampers

Pulsation dampers are often used in conjunction with oscillatory displacement pumps.
They are necessary when:
• Low-pulsation flow is required, for example, for process reasons.
• Depending on the piping situation, it is necessary to reduce impermissibly high pressure
peaks during operation of oscillatory displacement pumps or pressure loss must
be avoided; in this case, it is necessary to use pulsation dampers both on the intake
side as well as the delivery side.
Diaphragm type pulsation damper
(bubble accumulator)
fig. 37
Function
Their function is based on compression and expansion of a gas cushion in order to release
energy.
As the pressure increases, a part of the medium to be delivered is stored and then released to
the pipe network as the pressure decreases.
In principle, a differentiation is made between pulsation dampers with and without a separating
diaphragm.
In pulsation dampers without a separating diaphragm (e.g. air tank), the medium has direct
contact with the gas cushion which is formed by feeding in compressed air. After start-up, the
compressed air is compressed to the damping volume. Since the compressed air is gradually
released in the medium, venting is necessary from time to time with the system depressurized.
This disadvantage is avoided by using pulsation dampers with a separating diaphragm.
In this case, the damping gas cushion is separated from the delivered medium by a flexible
diaphragm and thus protected from absorption.
Compressed air vessel
Hydraulic Accessories
In-line damper
Page 25