Specific Operating Instructions; Opening The Safety Shut-Off Valve; Engaging Actuators K10A, K11A/1 And K11A/2; Specific Maintenance Instructions - RMG 672 Operating And Maintenance Instructions/ Spare Parts

2.

Specific operating instructions

2.1 Opening the safety shut-off valve

The shut-off valve works on the principle of underpressure shut-off. It can be engaged only if the pressure at the measuring point
corresponds to the operating pressure pa.
Actuators K10a, K11a/1 and K11a/2 must engage first.

2.2 Engaging actuators K10a, K11a/1 and K11a/2

Unscrew sealing cap (1), turn round and put on rod (22, 50). Pull rod all the way to limit stop and let slip back slowly.
The actuator is engaged. The shut-off valve may be opened now.
3.

Specific maintenance instructions

3.1 Actuators K10a, K11a/1 and K11a/2

Before dismounting the actuator from the shut-off valve switch device, you must release the actuator.
Devices with underpressure release are released automatically.
NOTE
•
Rod (22) must move easily. If you should find any damages to the switching face
(dents, burs etc.), replace the rod.
•
The contact faces between the spring support (8) and lock bushing (12) must be free of grease and oil at all times.
•
The spheres (28) and their support holes may be greased, but only a very thin layer of grease.

3.2 Actuation tests

Actuation tests with actuators K10a, K11a/1 and K11a/2 for RMG 503, RMG 530 and RMG 711 may be carried out only
with actuators mounted on shut-off valve switch devices. Otherwise, there is a danger of mechanical damage.
Caution
!
3.3 Instructions for testing and adjusting actuators / switch devices
3.3.1 Actuators K10a, K12 and K13 for RMG 402, RMG 408 and RMG 721
Casing
Shut-off valve must be engaged. Switching rod must rest on switch bearing. The value of adjustment Y between joining
piece and pressure spring must be equal to gap X (with respect to casing). In the event of deviations, turn adjusting nut
to adjust. The switch rod must be about 2 mm shorter.
672.20 S.04
If you want to dismount the switch mechanism, you must first initiate the underpressure release
and then pull back the rod (22) at least to its engaging position.
When mounting the switch mechanism, pull back rod (22) and push the lock bushing (12)
over the spheres (28). (Position as in case of underpressure shut-off.)
Before starting, remove sealing cap (1) from rod (22).
X
Pressure spring
Adjusting nut
Switching rod
Switch bearing
Y
2 mm
Switch device