Installing The Valve In The Pipe; General - Samson EB 01b Mounting And Operating Instructions

5.3.2.2 Travel limit for the "actuator stem re-
tracts - fail-open" principle of opera-
tion
Figure 5-3: Assembly situation, travel limit for "fail-open"
The mechanical travel limit for fail-open action is implemented by
two lock nuts (24) that are fi t outside of the stem (12).
The nuts (24) are secured with a safety distance of approx. 2mm
from the top of the stuffi ng box (19).
Theoretical travel (SAMSON actuator) 15 +0.5 to 1 mm
5.3.2.3 Actuator travel limit
In some cases, a travel limit is required for the actuator. Details
about the travel limit can be found in the corresponding actuator
documentation.
For SAMSON actuators:
− Pneumatic actuator type 3271, actuator surface: 1400-
60 cm², see the Installation and Operating Manual

EB 8310-3, Chapter "6.2 Setting travel limits".
− Pneumatic actuator type 3271 and type 3277, actuator sur-
face: 355v2 cm², see the Installation and Operating Manual

EB 8310-4, Chapter "6.2 Travel limits".
− Pneumatic actuator type 3271 and type 3277, actuator sur-
faces: 175v2, 350v2 and 750v2 cm², see the Installation and

Operating Manual EB 8310-5, Chapter "6.2 Travel limits".
− Pneumatic actuator type 3271 and type 3277, actuator sur-
faces: 240, 350 and 700 cm², see the Installation and Oper-

ating Manual EB 8310-6, Chapter "6.2 Travel limits".
− Pneumatic actuator type 3271, actuator surface: 2800 cm²,
see the Installation and Operating Manual
Chapter "6.1.3 Adapting the travel range".
Details about the other actuators can also be found in the corre-
sponding actuator documentation.
EB 01b_EN
February 2022 edition
Subject to technical changes
The dimensions provided in Table 5-3 reach a suitable pretension
that implements the sealing between the seat and the plug.
Table 5-3: Actual travel

5.4 Installing the valve in the pipe

5.4.1
NOTE
Damage to the lined valve surface due to improper transport
and installation!
Before and during installation, the lined surfaces can be dam-
aged and must be specifi cally protected.
Transport the valve in its original packaging to the installation
site and unpack it only there.
Handle the valve with care and observe the instructions for
the fl ange connection.
Damage to the plastic lined surfaces on the body due to
improper installation!
The use of PTFE fl ange seals is recommended.
The counterfl anges must have smooth sealing surfaces.
Other shapes must be agreed upon with PFEIFFER.
Inspect the valve and actuator for transport damage. Dam-
aged valves or actuators may not be installed.
A functional test is to be carried out at the beginning of in-
stallation only for manually-operated valves: The valve must
close and open correctly. Detected malfunctions must be fi xed
before commissioning. See also chapter 8 "Faults".
DANGER
Danger due to exceeding the limits of use!
Exceeding the limits of use can pose a danger to the user and
cause damage to the pipe system.
No valve may be installed whose permissible pressure/tem-
perature range is not suffi cient for the operating conditions.
The max. permissible limits of use are marked on the valve,
see Chapter "2 Markings on the device".
The permissible range is defi ned in Chapter "1 Safety instruc-
tions and safety measures".
Make sure that only valves are installed whose pressure class-

EB 8310-7, es, connection type (fl ow rate), type of lining and connection
dimensions match the conditions of use. See the correspond-
ing marking on the valve.
Travel 15 mm Actual travel 16 to 17 mm
Travel 30 mm Actual travel 31 to 32 mm

General

Installation
5-3