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Installation & Maintenance Instructions
Sapag Interlock changeover valves
Interlocking trim assembly
1. Insert the gland flange (and the yoke if removed; the yoke is screwed all the way in on the
side body neck, and then back to the correct orientation with regards to the holes of the gland
flange; the yoke will be further tack-welded in the right position).
2. Assemble the gland flange studs and bolts; they will be tightened at the final stage.
3. Details of the assembly of the entire Morse torque limiter systems is outlined in appendix.
Valve testing
1. Perform the pressure tests of each individual changeover valve as per the Installation &
Maintenance Instructions, Change-Over Valves, reference SAPDR 0009 EN
Overall assembly and settings
1. After satisfactory completion of the tests, assemble the changeover valves and their associated
safety relief valves. The mounting of the safety valves shall be as per the appropriate Safety
Relief Valve Instructions Manuals.
2. Make sure that the two discs are in the corresponding starting position.
3. Adjust (if required) and assemble the chain (2) onto the appropriate cog wheels.
4. The chain should be lubricated using an appropriate mechanical lubricant.
5. Assure that the tension of the chain is loose enough not to increase the required torque, and
tightened enough to avoid the chain to be derailed.
6. Assemble the hand-wheel on the inlet changeover valve cog wheel side.
7. Tack-weld the yokes (if required) and bearing boxes (9).
8. Torque limiter adjustment:
e) The torque is calibrated by tightening three pressure screws located on each torque limiter
nut.
f) Adjust the pressure of the screws of the limiter nuts so that the torque overcomes the friction
of the stems into their respective packing.
g) Finally, tighten the inlet changeover valve torque limiter harder than the outlet changeover
valve; it must remain possible to turn the hand-wheel when the outlet valve disc has reached
its seat and the inlet disc is still travelling to position.
h) The Interlock is securely and fully operated when:
- the position indicators show the correct location of both discs, and
- both torque limiters are slipping while the hand-wheel is operated.
Morse torque limiter and Bearing box sub assembly
1.
The clutch bushing and bearing box can be assembled either before installing it onto the valve
stem or on the valve stem itself, depending on the operator. It is recommended to assemble
the box on the valve directly.
2. Screw the bearing box (9) into the yoke thread ensure the indicator (14) is not damaged during
the assembly; when the bearing box comes to the key groove, insert the key (12); screw the
bearing box all the way in; it shall be tack-welded at the final stage.
3. Prepare the clutch bushing (5) :engage the ball bearing centring ring (8) onto the clutch
bushing (5).
4. Lock the centring ring (8) with the ball bearing nut (15) affix the bearing nut (15) with a pin
into the clutch bushing (5); the pin must not perforate the bushing and just allow to stop the
bearing nut.
5. Assemble the ball bearing with its two rows of balls and plates. The bearing shall be greased
using an appropriate MoS2 lubricant or equivalent.
6. The thread of the stem shall be lubricated using an appropriate MoS2 lubricant or equivalent
7. Engage the clutch bushing (5) and its bearing (8) into the bearing box (9) and screw it onto
the stem threaded end.
8. Lock the bearing (8) into the bearing box (9) with the bearing nut (6) screw the nut (6) all the
way in and then unscrew to allow sufficient clearance (approximately 1/8 to 1/4 turn).
9. Lock the bearing nut in position with a stop screw (10).
10. Insert the torque limiter bottom flange (4) onto the clutch bushing (5) locate the pin holes of
the flange (4) in front of each of the three holes drilled into the clutch bushing (5)
affix the flange (4) with three pins on the clutch bushing (5); stop the flange (4) using the hex
stop screw.
11. Caution ! the friction discs and their counterparts must be absolutely dry and exempt from any
lubricant !
12. Pile the first friction disc up on the torque limiter bottom flange (4) together with the centring
ring.
13. Pile the cog wheel (3) up on the centring ring.
14. Pile the second friction disc up on the cog wheel (3).
15. Pile the bearing plate (with the oblong hole) up on the friction disc.
16. Insert the Belleville washer onto the bearing plate and the Belleville washer centring ring on
top of it.
17. Engage the torque limiter nut all the way to the contact with the assembly and tighten it
moderately. Tighten the three nut adjusting screws evenly and moderately these screws will
be adjusted later.
Emerson reserves the right to change the contents without notice
1
2
3
4 5
10
10
13 14
page 4
6
7
8
9
11
12
10
13
15
Fig. 6
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