Instruction Manual Form 5132 May 1999
Type 667NS
Type 667NS Diaphragm Actuator Sizes 40, 45, 70, and 80 Contents
Introduction
.............................. 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction
........ 2
................................ 3 Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Direct-Acting (Push-Down-to-Close) Valves . . . . . 3 Reverse-Acting (Push-Down-to-Open) Valves . . . 5 Loading Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation
.............................. 6 Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Discussion of Bench Set . . . . . . . . . . . . . . . . . . . . . 6 Adjustment Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Adjustments
Operation
................................. 7
.............................. 8 Replacement of the Elastomeric Parts . . . . . . . . . . . 8 Size 40, 45, and 70 Actuators . . . . . . . . . . . . . . . . . 8 Size 80 Actuators . . . . . . . . . . . . . . . . . . . . . . . . . 11 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Size 40, 45, and 70 Actuators . . . . . . . . . . . . . . . 11 Size 80 Actuators . . . . . . . . . . . . . . . . . . . . . . . . . 13 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Size 40, 45, and 70 Actuators . . . . . . . . . . . . . . . 13 Size 80 Actuators . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
This manual provides installation, maintenance, and parts list information for the Type 667NS actuator. Refer to separate instruction manuals for information regarding the control valve and accessories. Use qualified personnel when installing, operating, and maintaining the actuator. If you have any questions about these instructions, contact your Fisher Controls sales office or sales representative before proceeding.
Description The Type 667NS actuator is a reverse-acting, springopposed diaphragm actuator that is used for operation of automatic control valves. The Type 667NS actuator yoke construction and special bonnet-to-yoke bolting provides a high structural resonant frequency that exceeds most nuclear service seismic requirements.
Specifications Tables 1 and 2 provide specifications for the various sizes of Type 667NS actuators discussed in this instruction manual.
D102603X012
Maximum Pressure Limitations
Scope of Manual