4 GV 74 en
3
1
GENERAL
1.1
Scope of the manual
This manual provides essential information on series GW,
Globe 3-way Diverting or Mixing type installed sliding stem
valves. Actuators and positioners are only discussed briefly.
Refer to the individual manuals for further information on
their installation, operation and maintenance.
1.2
Valve construction
Series GW valves are flanged (weld end available) 3-way
sliding stem control valves. Two seat rings and the plug
with stem is a module accessible through the bottom bon-
net opening (bottom entry) of the body.
GW valves are available both diverting and mixing flow for
a most primary application is in temperature control.
Our standard design combines the benefits of more strong
guiding with a top and bottom seat rings, and the solid cylin-
drical plug makes strong support to ensure valve alignment.
GW valves are available both cylindrical and V-port plug trim
depending from the application, standard is cylindrical plug.
This series are available to provide a series of reduced trim
and the standard seat tightness is class II, optional trims can
meet to class III and IV, ANSI/FCI 70.2.
The detailed structure is revealed by the type code shown
on the valve identification plate. The type code is explained
in Section 11.
1.3
Valve markings
The body markings are: manufacturer's trademark, nominal
size, pressure rating and material of the body. The valve has
an identification plate attached to it, see Fig. 2.
Markings on the identification plate:
1.
Type designation (Valve code)
2.
Size, Rating
3.
Cv
4.
Body material
5.
Plug, Stem material
6.
Seat material
7.
Temp. min./max.
8.
Maximum (shut-off ) pressure
9.
Valve manufacturing date
10. Tag
No.
11.
Serial No.
NOTE:
Selection and use of the valve in a specific application
requires close consideration of detailed aspects. Due to the
nature of the product, this manual cannot cover all the indi-
vidual 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 Automa-
tion for more information.
Fig. 1
Construction of the Neles GW series 3-way Valve
Mixing type
Diverting type
Fig. 2
Identification(name) plate example
