2 VG8300N & H
Application Overview
Valve bodies are made of nodular cast iron and
are available in sizes from 40 mm to 150 mm.
Flanged connections comply with EN and DIN
standards. These valves also comply with
Pressure Equipment Directives (PED).
Information regarding the CE mark can be found
on the valve ID plate. The valve trim and seat
edge are made of stainless steel. The valve
packing consists of spring loaded Viton-Teflon V-
rings.
The VG8300N & H Bonnet
The valve design incorporates a pressure
equalisation chamber above the valve plug. A
connection between the chamber and the area
beneath the plug allows fluid pressures on both
sides of the plug to find a balance. This means
that with higher close-off pressures, the actuator
required to close the valve need not be of as high
a thrust as would be necessary for a normal valve
under similar conditions.
The VG8300N and VG8300H valve series are
available in two-way PDTC configuration.
These two-way valves have an equal percentage
flow characteristic. An arrow is embossed on one
side of the valve body indicating the direction of
flow for correct installation.
The upper operating fluid temperature range limit
of the VG8300N is 180°C and 200°C for the
VG8300H.
Models where packing includes an optional cup
for glycerine anti-freeze are available for fluid
temperatures as low as -10°C for the VG8300N
and -20 °C for the VG8300H.
Note: This option is imperative where
temperatures can fall below 0°C
A variety of electric actuators are available and
can be ordered as a factory fitted valve/actuator
combination or as a single item for on site
installation.
Ordering codes for Valve Bodies
Two-Way PDTC
VG83 S1
Body Type
N PN 16
H PN 25
Size kvs
E2 DN 40 16
E1 DN 40 25
F1 DN 50 40
G1 DN 65 63
H1 DN 80 100
J1 DN 100 160
K1 DN 125 250
L1 DN 150 350
For ordering a valve with Glycerine cup packing,
add suffix "20" to the ordering code: i.e.
Reduced kvs coefficients are available on request
a longer delivery time should be taken into
account.
Ordering Example:
For a DN 65, kvs 63, PN 16 valve, the ordering
code is: VG83G1S1N
Special models (heavy duty, special coating) are
available on request.
Valve Selection
The valve size for water applications can be
defined using the diagrams below, where the
intersection of the pressure drop across the valve
and the flow must be within the white area.
kvselection diagram for DN 40...150
valves:
1000
800
600
400
300
100
200
80
60
30
20
10
8
6
3
1
0.8
0.6
0.4
4
40
350
250
160
100
63
40
25
16
Flow Q, in m
/h
Pressure drop Δp in kPa (100 kPa = 1 bar)
Flow direction
Slotted Stem Spring loaded, self
adjusting packing
Equalisation chamber
Bonnet
Body
Plug
Flow direction
