DRESSER RB 4000 Betriebsanleitung Seite 10

Resetting of the shut-off valve with lever reset (Type SSV 8600)
• Close the downstream stop valve
• Slowly operate the resetting lever 27 clockwise until
the internal by-pass is open 26 . This leads to filling the
downstream area 12 and the control chamber 19 .
• When the pressure indicated on the manometer in-
stalled in the downstream pipe is stabilized, continue
to move the lever 27 in order to permit the connection
of the lever system 24; at this point the lever will remain
stable on the opening position .
27
Shut-off Valve Adjustment
The shut-off valve is usually supplied with preset values
according the order . Should be necessary to modify the
calibration value, it must be considered that the modifi-
cation can be effected only within the specific set range
of the spring installed, otherwise it is necessary to substi-
tute with a suitable spring to be selected referring to the
provided tables .
10
26
After these operations, the shut-off valve is into opera-
tion and it is possible to proceed slowly with the opening
of the downstream valve
19
24
When the installed spring is appropriate to obtain the
required pressure, proceed as follows:
• Over pressure shut-off operation
Rotate in a clockwise direction the external screwing
ring 21, increases the set point value, or in a anticlockwise
direction to reduce it .
• Low pressure shut-off operation
Rotate in a clockwise direction the central screwing ring
to increase the set point value or in an anticlockwise di-
rection to reduce it .
21 22