Emerson Fisher OS2 Instruction Manual page 14

Type OS2
COUPLing
COUPLing
HEaD
W6853_1
Figure 9. Equalizer Bypass and Coupling Assembly for
NPS 1 through 6 / DN 25 through 150 Body Sizes
6. Place the mechanism box (key 16) onto the bonnet
(key 15) and attach using two cap screws (key 39) and
two flat washers (key 40).
7. Hook the sliding clevis to the stem and insert the pin
(refer to Figures 7 and 8). Secure the Pinusing the clip.
8. To reset, see Resetting the Trip Mechanism in the
Adjustment section.
Assembly for NPS 8 and 10 / DN 200 and 250
Body Sizes (Refer to Figure 15)
1. Perform the operations described in Disassembly in
reverse order.
2. Replace O-rings at each disassembly.
3. Be careful when removing or replacing the valve
plug assembly (key 13) to avoid damaging the piston
ring (key 7).
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.
14
EQUaLiZEr ByPaSS
(KEy 5a)
rOLL PinS
COUPLing
HEaD
VaLVE PLUg
(KEy 5H)
PLUg O-ring
(KEy 32)
W6855
Figure 10. Valve Plug and Equalizer Bypass Assembly for
NPS 1 through 6 / DN 25 through 150 Body Sizes
• 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.
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).
HOLES FOr
SPannEr
WrEnCH
EQUaLiZEr
ByPaSS (KEy 5a)
VaLVE PLUg DiSK