Metso VD Series, Инструкция по установке, обслуживанию и эксплуатации

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6 DA 70 en 3
1 GENERAL
1.1 Scope of the manual
This manual provides essential information on Metso series
VD, Pneumatic Linear, Spring Diaphragm Actuators. Valve
body and trims are only discussed briefly. Refer to the indi-
vidual manuals for further information on their installation,
operation and maintenance.
1.2 Structure and operation
Metso series VD are Pneumatic Linear, Spring Diaphragm
actuators. Excellent accuracy and reliability is achieved
through the use of multiple springs and rolling diaphragm
in the actuator.
The use of involute rolling diaphragm permits the long
travel and excellent linearity without the need of expensive
hardware normally associated with diaphragm actuators.
The rugged one piece yoke, pressed steel diaphragm case
and special nylon reinforced diaphragm provide dependa-
ble, high thrust performance.
This series are available to provide a optional handwheel for
manual operation. The detailed structure is revealed by the
type code shown on the valve identification plate. The type
code is explained in Section 10.
1.3 Actuator markings
The actuator is provided with an identification plate, see
Fig. 2. Identification plate markings are:
1. Actuator code (model)
2. Manufacturing site, date, serial no.
3. Supply, air fail to
4. Range and travel
5. Max. supply pressure
Also, provided with an warning plate, see Fig. 3
1.4 Specifications
Table 1. VD Actuators temperature ranges
Note:
1. Temperature: Ambient temperature
2. Type code reference: Please see in page 17 (materials).
3. Other low temperature ranges: Please contact Metso
Table 2. VD Actuators air supply connections
NOTE:
Selection and use of the actuator in a specific application
requires close consideration of detailed aspects. Due to
the nature of the product, this manual cannot cover all the
individual situations that may occur when the actuator is
used.
If you are uncertain about use of the actuator or its suita-
bility for your intended purpose, please contact Metso
Automation for more information.
Fig. 1 VDD, Direct & VDR, Reverse
Fig. 2 Identification plate
Fig. 3 Warning plate
Description Standard VD Low. Temp. VD Arctic VD model
Temp. range -20 °C to +85 °C -40 °C to +70 °C -53 °C to +70 °C
Type code ref.
(sign 6-9)
AEAK AELK ASSK
Stardard 1/4" NPT for all sizes
Optional 3/8", 1/2" NPT and others
ACT'R CODE
SUPPLY AIR FAIL TO
CO NO.
DATE SIZE
TAG NO.
RANGE
TRAVEL
Metso Flow Control
MAX SUPPLY PR.
4. 2B AR (60P S I) MAXIMUM
DIAP HR AGM C AS E P RE S S UR E
A C T U A L R E C O M ME N D E D S U P P L Y P R E S S U R E M A Y B E L O W E R D U E T O M E C H A N I C A L
L I M I T A T I O N O F V A L V E O R P N E U M A T I C A C C E S S O R I E S . … … … … … S E E I D P L A T E
UNDE R S P R ING TE NS ION AND IS E QUIPPE D WITH
LONG E S T HE XAG ON S C R E W WHIC H MUS T B E R E MOVE D LAS T
VD
WAR NING