Samson EB 14b, Монтаж и эксплуатация

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3-2
EB 14b_EN
January 2022 edition
Subject to technical changes
Design and principle of operation
3.2 Additional fi ttings
Strainer
PFEIFFER recommends installing a strainer in front of the butter fl y
valve. A strainer prevents the solid content in the medium from
damaging the butter
fl y valve.
Bypass and shut-off valve
PFEIFFER recommends installing a shut-off valve in front of the
strainer as well as behind the butter
fl y valve and to create a by-
pass. By means of the bypass, the entire plant does not have to
be decommissioned during maintenance and repair work on the
butter
fl y valve.
Insulation
The butter fl y valves can be insulated to reduce the passage of
heat energy. Observe the notes in Chapter “ 5 Assembly”.
Test connection
In the version with a double stuf fi ng box, a test connection (e.g.
G¼“) can be used on the upper fl ange to check the tightness of
the butter fl y valve towards the atmosphere.
Grip protection
In the case of conditions of use that require a high level of safety
(e. g. if the butter
fl y valve is freely accessible to untrained spe-
cialist personnel), PFEIFFER offers a safety guard to prevent the
risk of crushing due to moving parts (actuator- and switching
shaft).
The risk assessment of the plant by the operator will indicate if
the installation of this protective device is required for the safe
operation of the butter
fl y valve in the plant.
3.3 Attachments
The following accessories are available either individually or in
combinations:
− Locking device
− Switching shaft extension (100 mm standard)
− Pneumatic or electric rotary actuator
− Positioner (with the control valve option)
− Limit switch
− Solenoid valves
− Filter - reducing station
− Jacket heater
Other additional equipment is possible according to speci fi ca-
tions on request.
3.4 Technical data
The type plates of the butter fl y valve and actuator offer informa-
tion about the valve version, see Chapter “2 Markings on the de-
vice”.
Detailed information is available in the data sheet

TB 14b.
3.5 Butter fl y valve assembly
The BR 14b / 14c butter fl y valves have design differences in the
various versions so that they cannot be documented in one con-
struction manual.
− Chapter 3.5.1 describes the assembly of the butter fl y valve
BR 14b - type WTD and MTD.
− Chapter 3.5.2 describes the assembly of the butter fl y valve
BR 14b - type WNS.
− Chapter 3.5.2 describes the assembly of the butter fl y valve
BR 14c - type WTD and MTD.
Preparation of the assembly
To assemble the butter fl y valve, all parts must be prepared, e.g.
the parts are carefully cleaned and placed on a soft mat (rubber
mat or other). Keep in mind that plastic parts are almost always
very soft and very delicate, and in particular the sealing surfaces
may not be damaged.
Damage due to cold welding of the screws in the body!
PFEIFFER recommends a heavy-duty grease paste (e.g. Gleitmo
805, manufacturer Fuchs) to prevent the cold-welding of the
screws in the bodies.
Ö
Do not use this product for butter fl y valves with use of oxy-
gen.
Ö
A suitable lubricant must be selected for grease-free butter fl y
valves, especially for use with oxygen.
The position and arrangement of the individual parts shown in
the drawings must be observed during assembly.
3.5.1 Assembly of butter fl y valve BR | 14b
with spring washer preloaded V-ring
packing (type WTD and MTD)
3.5.1.1 Preassembly of the butter fl y valves
Ö
Place the valve body (1) on a clean surface at working height
so that the bearing area of the shaft is easy to reach.
Ö
Push the bearing bushing (12a) as far as it will go into the
bearing bore in the valve body.
Info
NOTE
Info