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Document Number:
OM2-8110-0300
Document Name:
Diaphragm Control Valves
Model: VDC, VAC, VST, VAA
Rating; ANSI Class 600 or under
User’s Manual
Date:
13th edition: Apr. 2023
Issued/Edited by:
Azbil Corporation
64
66
Table of Contents
Main Page
default chapter
3
Safety Guide
3
Safety Precautions
4
Verification of Valve Specifications and Precautions on Storage
4
Installation
6
Caution on Disassembly and Reassembly
10
Assembly
11
Maintenance and Inspection
12
Table of Contents
13
Chapter 1 : General
15
Specification of Control Valves
16
Construction
16
Valve Body Section
16
Actuator
16
Chapter 2 : Installation of a Control Valve
23
Chapter 3 : Inspection and Maintenance of Control Valves
25
Inspection before Starting Operation
25
Periodical Inspection and Maintenance
25
Lubrication of Gland Packing (for Valve with Asbestos Packing) (See Figure.3-1)
26
Chapter 4 : Control Valve Adjustment
27
Lift Adjustment
27
Spring Compression Adjustment
28
Positioner Adjustment
28
Chapter 5 : Disassembly and Reassembly
31
Disassembly
31
Reassembly
31
Disassembly and Reassembly of Bellows-Sealed Valve
32
Chapter 6 : Parts Replacement
37
Replacement of Gland Packing
37
Replacement of Valve Plug and Cage of VDC or VAC Control Valve
39
Replacement of Valve Plug and Seat Ring of VST, VAA, or VAV Control Valve
40
Diaphragm Replacement of Diaphragm Motor (See Figure 1-6, 1-7.)
41
O-Ring Replacement of Diaphragm Motor (See Figure 1-6, 1-7.)
42
Disassembly and Assembly of Model PSA6 Actuator
43
Chapter 7 : Manual Handwheel (Side Handwheel of Actuator)
55
Operation Method
55
Installation
55
Chapter 8 : Trouble Shooting
57
Chapter 9 : Recommended Spare Parts
59
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