Replacing The Diaphragm - Samson 45-1 Mounting And Operating Instructions

Maintenance – Replacing parts
4.2

Replacing the diaphragm

1. Unscrew the external control line. Re-
move the regulator from the pipeline.
Types 45-1 and 45-2
2. For Type 45-1, unscrew the control
line (11).
3. Loosen the screws (14). Remove the
lower diaphragm case (7) including the
operating diaphragm (6) and dia-
phragm plates (4) from the body.
If applicable, remove the set point
spring (8) from the valve body.
4. Unthread the nut (5). Remove the dia-
phragm plate. Replace the diaphragm.
To reassemble the regulator, proceed in
reverse order. Observe the tightening
torques specified in Fig. 1.
Types 45-2 and 45-4, version without
manual adjuster
2. Completely release the tension from the
spring(s) by turning the set point ad-
juster (9) counterclockwise.
3. For Type 45-2, unscrew the control
line (11).
4. Loosen the screws (14). Take off the
lower diaphragm case including all ac-
tuator parts as well as the diaphragm
and diaphragm plate.
5. Unthread the nut (5). Remove the dia-
phragm plate. Then replace the dia-
phragm.
To reassemble, proceed in reverse or-
der. Observe the tightening torques
specified in Fig. 1.
8
EB 3124 EN
Types 45-2 and 45-4, version with manual
adjuster
1. For Type 45-2, unscrew the control
line (11).
2. Completely release the tension from the
spring(s) (10) by turning the manual ad-
juster (19) counterclockwise.
3. Remove the screws (14). Take off the
bottom section of the valve body (16). If
applicable, remove the set point
spring (8) from the valve body.
4. Unscrew the diaphragm assembly in-
cluding the diaphragm plates, spring,
and support (17) from the spindle (18)
by turning the assembly counterclock-
wise. Remove it from the bottom section
of the valve body.
5. Caution! Push the spring (10) up over
the support (17) so that the spring
plate (15) is tensioned and cannot slide
off the support.
6. Fasten the bottom diaphragm plate.
Unthread the nut (5).
7. Replace the diaphragm. Tighten the
nut (5) to 22 Nm.
8. Push the complete assembly over the
spindle into the bottom section and
screw it onto the spindle by turning it
clockwise one turn.
9. Lift the diaphragm plate to check
whether the thread of the spring
plate (15) has engaged. If not, turn
again.
10. Hold the diaphragm stationary. Turn the
manual adjuster clockwise until the set