Samson 3331/3278, Монтаж и эксплуатация

Страница: 6 / 12

2 Installation
2.1 Assembling butterfly valve
and rotary actuator
Note!
The butterfly valve may be used for throttling
or on-off service.
For on-off service, the opening angle must
be set to 90° (70° with angle-seated discs)
using the stop screws.
For throttling service, the opening angle
must be set to 70° using the stop screws.
2.1.1 Type 3331-BR 31a, Type SRP
If the valve and actuator have not been pre-
assembled by the manufacturer, proceed as
follows:
Note!
In the standard actuator version (SRP = sin-
gle acting with spring-return mechanism)
the springs turn clockwise.
Should the springs turn counterclockwise,
this must be specified on ordering the actua-
tor.
The rotary actuator can be mounted either
vertically or horizontally on the valve and
may be positioned at 90° around the valve
as required by the on-site conditions over a
square-end shaft.
Valve CLOSED without supply air
1. Place disc (8) in closed position (0° an-
gle of rotation).
2. Fasten yoke (3) with 2 or 4 screws de-
pending on the nominal size of the valve
to the flange of the shaft (4).
3. Place shaft adapter (if required) onto the
shaft. Slide actuator over adapter (or
shaft) and fasten to the yoke using four
screws.
4. Turn the stop screw (12.1 or 12.2, de-
pending on the direction of rotation) un-
til the valve is completely closed.
Align the markings on the shaft with the
markings on the gland flange.
5. Secure the position of the stop screw
with its lock nut.
6. Apply a signal pressure to match the
number of springs (see nameplate) to the
loading pressure connection.
7. Turn the other stop screw until the disc
reaches the opening angle of 90° or
70°.
8. Secure the position of the stop screw
with its lock nut.
Valve OPEN without supply air
1. Place disc (8) in open position (90° an-
gle of rotation).
2. Fasten yoke (3) with 2 or 4 screws de-
pending on the nominal size of the valve
to the flange of the shaft (4).
3. Place shaft adapter (if required) onto the
shaft. Slide actuator over adapter (or
shaft) and fasten to the yoke (3) using
four screws (3.1).
6
EB 8227 EN
Installation