DeZurik M3 Руководство - Страница 4
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M-Series Manual Actuator
Description
The M3 & M7 M-Series Manual Actuators have a fully enclosed scotch yoke mechanism driven by a
handwheel, chainwheel or 2" nut. The actuator is available as weatherproof or buriable, and has
internally adjustable stops. The actuator conforms to the applicable requirements of ANSI/AWWA
Standard C504.
The actuator is sized for the valve and shutoff pressure specified. Consult the factor for sizing
information if the actuator is used for other applications. The actuator is available for both 300 ft. lb.
input and 450 ft. lb. input. The 450 ft. lb. style has two guide blocks in addition to the guide rail used in
both styles.
Operation
Clockwise rotation of the actuator input shaft closes the valve, and counterclockwise rotation opens the
valve. The M3 requires 29-1/4 turns, and the M7 requires 42 turns of the input shaft to drive the
actuator the 90 degrees from one position to the other.
Required Tools
The actuator is assembled with SAE fasteners. Tools required for adjustment and disassembly include
a set of combination wrenches, a flat-tipped screwdriver, a set of Allen wrenches, a pin punch, a file
and a small hammer.
Lubrication
The actuator does not require lubrication for routine maintenance. If the actuator is disassembled,
however, lubricate all bearing, sealing and threaded surfaces of the components listed below with
EXXON Unirex EP 2 Premium lubricant (recommended) or Petro-Canada Precision XL EP 2
(alternate) during assembly. See Figure 1 for parts location.
•
Actuator shaft, O-ring and bearing
•
Shaft threads
•
Collar(s)
•
Both stop nuts
•
Inner and outer thrust washer, both sides
•
Guide blocks
•
Yoke guide
•
Yoke nut
•
Yoke slots
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Yoke bearing sides
•
Bearing and O-ring where the valve shaft enters the actuator housing
After the actuator is fully assembled, apply a layer of lubricant approximately 1/2" thick to the above
surfaces that are accessible inside the housing. For buried service applications, continue to apply
lubricant until the housing is 90% filled.
Spare Parts
Recommended spare parts are listed below. Replace worn parts as described below.
•
Housing bearing
•
Yoke nut assembly
•
Thrust washers
•
O-ring for valve shaft
•
O-ring for actuator shaft
D10287
Page 4
February 2017