2 L6 70 en
3
1
GENERAL
1.1
Scope of the manual
This manual provides essential information for users of Nel-
disc® triple eccentric disc valves. If you need further infor-
mation on actuators and other accessories, please refer to
the individual manuals on their installation, operation and
maintenance..
1.2
Valve description
Neldisc series L6 is a double flanged type metal seated tri-
ple eccentric disc valve. Neldisc series L4 is a wafer type
metal seated triple eccentric disc valve.
The disc is elliptical and has a triple eccentric mounting.
When the valve is closed, the elliptical disc at the major axis
displaces the seat ring outward, causing the seat ring to
contact the disc at the minor axis. When the valve is
opened, the contact is released and the seat ring returns to
its original circular shape (see Fig. 1).
The disc is fitted to the shafts with pins and there are no
holes through the disc.
Construction details of individual valves are included in the
type code shown on the valve identification plate. To inter-
pret the type code, please refer to Section 11.
1.3
Valve markings
Body markings are cast on the body. The valve also has an
identification plate attached to it (see Fig. 2).
Identification plate marking:
1.
Body material
2.
Shaft material
3.
Trim material
4.
Seat material
5.
Maximum operating temperature
6.
Minimum operating temperature
7.
Maximum shut-off pressure differential
8.
Type designation
9.
Valve manufacturing parts list no.
10.
Pressure class
1.4
Technical specifications
Type:
L6
Flanged, reduced bore,
metal seated triple eccentric
disc valve
L4
Wafer, reduced bore
metal seated triple eccentric
disc valve
Pressure class:
L6C
ASME Class 150
L6D
ASME Class 300
L6F
Body and trim ASME Class 600
L6F/D
Body ASME Class 600
Trim ASME Class 300
L4F/D
Body ASME Class 600
Trim ASME Class 300
Possible flange drillings:
L6C
ASME B16.5 & B16.47 Class 150
EN 1092-1 PN 10 & PN 16
ISO 7005 PN 20
JIS 2210 10K & 16K
L6D
ASME B16.5 & B16.47 Class 300
EN 1092-1 PN 25 & PN 40
ISO 7005 PN 50
JIS 20K & 30K
L6F
ASME B16.5 Class 600
EN 1092-1 PN 63 & PN 100
Temperature range:
-200 °C to +600 °C
(-328 °F to +1100 °F)
Flow direction:
Free (L6C, L6D, L6F/D, L4F/D)
Flow from shaft side (L6F)
Dimensions:
See Section 10
Weights:
See Section 10
NOTE:
Selection and use of the valve in a specific application
requires close consideration of many different aspects.
Due to the nature of the product, this manual cannot
cover all the individual situations that may occur when the
valve is used.
If you are uncertain about use of the valve or its suitability
for your intended purpose, please contact Metso for more
information.
For valves in oxygen service, please see also the separate
installation, maintenance and operating instructions for
oxygen service (see Metso document id:10O270EN.pdf )
Fig. 1.
Neldisc seating principle
L6C, L6D,
L6F/D
L6F
Fig. 2.
Identification plate
BODY
TRIM
SHAFT
SEAT
TYPE
RATING
No.
t max.
t min.
ps
AT T E N T I O N : R E A D I N S T R U C T I O N S B E F O R E I N S TA L L AT I O N O R S E R V I C I N G. C O N TAC T M E T S O AU TO M AT I O N F O R C O P Y.
M a d e by M e t s o Fl o w C o n t ro l
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Summary of Contents for NELDISC L4 Series
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