Emerson Fisher OS2 Instruction Manual page 13

TYPE BMS
MANOMETRIC
DEVICE
(KEY 17)
TYPE BMS1
BRACKET KIT
(KEY 25)
TYPE BMS2
BRACKET KIT
(KEY 26)
4. Lubricate screws before tightening (molybdenum
graphite grease).
5. Lightly lubricate O-rings (silicone grease).
6. Replace the cover by tightening the screw manually or
by using a socket (maximum recommended torque is
1.8 ft-lbs / 2.4 N•m).
If the valve plug assembly (key 13) has been disassembled:
7. Lightly lubricate the valve plug O-ring (key 34)
(silicone grease).
8. Lubricate the thread of the valve plug cylinder (key 13B)
(molybdenum graphite grease).
9. Positioning the valve plug O-ring (key 34):
• For NPS 8 / DN 200 Body Size: Screw the valve plug
body (key 13A) partly to the valve plug cylinder (key 13B)
and insert the O-ring (key 34) into the groove before
tightening to reach metal/metal contact.
• For NPS 10 / DN 250 Body Size: Place the O-ring
(key 34) into the groove of the valve plug cylinder
(key 13B), assemble and screw the valve plug body
(key 13A) to reach metal/metal contact.
10. Wipe the valve plug O-ring (key 34) after assembly.
11. Lightly lubricate the stem valve (key 20) (silicone
grease) on the small stem bushing (key 24).
12. Check that the main spring (key 12) is
correctly positioned.
13. Positioning the O-ring (key 10):
• For NPS 8 / DN 200 Body Size: Mount on
connector part.
• For NPS 10 / DN 250 Body Size: Place in the bore of
the body.
17B
33
DIAPHRAGM,
TYPES 162 AND 71
Figure 11. Manometric Sensing Device Types
17D
17C
33
PISTON,
TYPES 27 AND 17
For the following procedures, key numbers are not shown in
the assembly drawings for NPS 8 and 10 / DN 200 and 250
body sizes.
14. Lubricate the mechanism of the release relay
(mechanism box face contact plus cam, spacer, bolt
and resetting latch (keys 121, 114, 113 and 100)
(molybdenum graphite grease).
15. Leave minimum operational space [rotation of the cam
(key 121) / bolt (key 113)] between the locknut (key 98)
and the resetting latch (key 100).
16. Lubricate the BMS spring (key 33) (molybdenum
graphite grease).
Manometric Sensing Device
(Type BMS1 or BMS2)
The Type BMS1 is the first manometric sensing device. The
Type BMS2 is the second manometric sensing device.
Disassembly
1. Disconnect the pressure sensing line from the
manometric sensing device (BMS, key 17).
2. If applicable, remove the BMS tripping hook from the
adjustable stem of the BMS (see Figures 5 and 6).
3. Loosen and remove the hex head cap screws
(key 38A) and O-ring (key 38B) at the mechanism box
(BM, key 16)/manometric device (BMS, key 17) joint.
(See Figure 13).
4. Carefully pull the BMS (key 17) away from the BM
(key 16) followed by a rubber joint gasket (key 38C,
Figure 13).
Type OS2
17C
33
BELLOWS,
TYPES 236 AND 315
13