Flowserve SMB Series Electric Actuators - Manual (Page 34)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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Worm Shaft (piece #21) cause the trippers to release the Clutch Ring (piece #33) and the Clutch Keys
(piece #23) from their hand position. This is an automatic feature of the actuator.
5.2.2 SMB-0 through SMB-4
Piece numbers refer to Figures 7.9 to 7.11.
The declutching action is similar to that of the smaller SMB actuators. When the Declutch Lever
(piece #10) is depressed, the Declutch Shaft (piece #24) causes the Declutch Fork (piece #12) to
push the Worm Shaft Clutch (piece #50) out of engagement with the worm shaft clutch gear (piece
#41) and into engagement with the Handwheel Clutch Pinion (piece #42). The Clutch Trippers
(piece #32) lock the worm shaft clutch in this position. When the Handwheel (piece #5) is rotated,
the Handwheel Gear (piece #7) turns the Handwheel Clutch Pinion (piece #42) and the Worm Shaft
(piece #43), placing the actuator into manual operation.
When the electric motor is energized, the Tripper Pins (piece #51), which are part of the Worm Shaft
Clutch Gear (piece #41), cause the Trippers to be released, allowing the Worm Shaft Clutch (piece
#50) to be released from hand operation and engage in motor operation.
For all actuator sizes, when the handwheel is turned, the motor does not rotate; and when the motor
is in operation, the handwheel does not rotate in manual operation.
5.2.3 SMB-5 through SMB-5T
Piece numbers refer to Figures 7.13 to 7.16.
The declutching action is similar to that of the smaller SMB-0 through 4 actuators. When the
Declutch Lever (piece #9) is depressed, the rotation of the Declutch Shaft (piece #30) causes the
Declutch Fork (piece #14) to push the Sliding Gear Clutch (piece #51) out of engagement with the
Flexible Jaw Clutch Housing (piece #50) and into engagement with the Handwheel Gear (piece #6).
The Clutch Trippers (piece # 33, 34) lock the Drive Shaft Clutch in this position. When the Handwheel
(piece #10) is rotated, the Handwheel Shaft and Pinion (piece #40) turns the Handwheel Gear (piece
#6) and the Hollow Drive Shaft (piece #55), placing the actuator into manual operation.
When the electric motor is energized, the Motor Clutch Gear Cam Pins (piece #52), which are part
of the Flexible Jaw Clutch Housing (piece #50), causes the Clutch Trippers (piece #33, 34) to be
released, allowing the Sliding Gear Clutch to be released from hand operation and engage in motor
operation.
For all actuator sizes, when the handwheel is turned, the motor does not rotate; and when the motor
is in operation, the handwheel does not rotate.