Samson 3381 Series, Mounting And Operating Instructions, Page: 15 / 48

EB 8084 EN 3-3
Design and principle of operation
3.2 Principle of operation
The Type 3381 Silencer provides noise atten -
uation by acting as a fixed restriction. The si -
lencer raises the pressure of the medium flow
at the valve outlet and reduces the pressure
downstream of the silencer to the required
downstream pressure p2. As a result, the
sound pressure level is reduced. In applica-
tions using compressible media, it addition-
ally lowers the flow velocity at the valve out -
let.
The pressure reduction per attenuation plate
(Δp) depends on the flow rate and the pre -
vailing operating temperature. Generally,
the pressure reduction is between 1 and
7 bar.
A five-stage silencer (Type 3381-3-5) nor
-
mally provides a maximum pressure drop of
35 bar.
3.3 Technical data
Noise emissions
SAMSON is unable to make general state-
ments about noise emissions. The noise emis-
sions depend on the valve version, plant fa-
cilities and process medium.
Dimensions and weights
Details on dimensions and weights are avail-
able on request.
More information is available in Data Sheet
u
T 8084.
Note
Table 3-1: Technical data
Type 3381-1, Type 3381-1R, Type 3381-3-X or Type 3381-4-X Silencer
Version according to
DIN ANSI
Material 1) Forged steel
P250GH ·
1.0460
Forged stainless
steel 1.4401
Forged steel
A105
Forged stainless
steel A182 F316
Nominal size DN 40 to 800 NPS 1½ to 32
Pressure rating
2) 3)
PN 10 to 400 Class 150 to 2500
Type of connection All DIN EN versions All ANSI versions
Temperature range
4)
–50 to +400 °C –58 to +750 °F
1)
Other materials on request
2)
Only nominal sizes possible according to the standard
3)
Varying pressure ratings for the inlet and outlet cannot be implemented
4)
Other temperature ranges on request