Preparation For Installation - Samson 3241 Series Mounting And Operating Instructions

Installation
Vent plugs
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic de-
vices. They ensure that any exhaust air that
forms can be vented to the atmosphere (to
avoid excess pressure in the device). Further-
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
Î Locate the vent plug on the opposite side
to the work position of operating person-
nel.
Table 5-1: Inlet and outlet lengths
State of process
medium
Gas
Vapor
Liquid
Flashing
Multi-phase
No saturated steam
1)
5-2
Q
a x DN
Valve conditions
Ma ≤ 0.3
0.3 ≤ Ma ≤ 0.7
Ma ≤ 0.3
1)
0.3 ≤ Ma ≤ 0.7
1)
Saturated steam (percentage of conden-
sate > 5 %)
Free of cavitation/w < 10 m/s
Cavitation producing noise/w ≤ 3 m/s
Cavitation producing
noise/3 < w < 5 m/s
Critical cavitation/w ≤ 3 m/s
Critical cavitation/3 < w < 5 m/s
–
–

5.2 Preparation for installation

Before installation, make sure the following
conditions are met:
− The valve is clean.
− The valve and all valve accessories (in-
cluding piping) are not damaged.
− The valve data on the nameplate (type
designation, valve size, material, pres-
sure rating and temperature range)
match the plant conditions (size and
Q
a
b
b x DN
Inlet length a
Flow rate
Inlet length
Outlet length
Outlet length b
2 4
2 10
2 4
2 10
2 20
2 4
2 4
2 10
2 10
2 20
2 20
10 20
EB 8015 EN