3 R 71 EN - Issue 9/2020
3
1 GENERAL
1.1 Scope of the manual
This manual provides essential information on R series V-port
segment valves. Actuators and other accessories are only discussed
briefly. Refer to the individual manuals for further information on their
installation, operation and maintenance..
1.2 Valve construction
R1 series valves are V-port segment valves installed between
flanges. R2 series valves are flanged V-port segment valves. The
body is in one part; the shaft and the segment are separate. Shaft
blow-out is prevented by plates mounted against the shaft shoulder.
The valve is either soft or metal seated. Tightness derives from the
spring force pressing the seat against the segment. The structure of
the valve supplied may vary, depending on the customer’s
requirements. The detailed structure is revealed by the type code
shown on the valve identification plate. The type code is explained in
section 12.
The valve is designed for both control and shut-off applications.
1.3 Valve markings
Body markings are cast on the body. The valve also has an
identification plate attached to it, see Fig. 3.
Identification plate markings:
1.
Body material
2.
Shaft material
3.
Segment 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
11. Model
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 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 Neles for more information.
Fig. 1
Construction of a V-port segment valve
Fig. 2
Identification plate
Sizes 25–80
Sizes
≥
100
(1) (3)
(5)(6)(7)
(4)(9) (8)
(1) (3
(5) (6)
(8) (9)
(2) (4)
(7)
(10)
(11)
(11)
