Special-Purpose Valve Low-Noise Control Valve with Built-in Pilot Plug Model EGVT OVERVIEWS

Special-Purpose Valve Low-Noise Control Valve with Built-in Pilot Plug Model EGVT OVERVIEWS
No. SS2-EGV100-0002
Special-Purpose Valve
Low-Noise Control Valve with Built-in Pilot Plug
Model EGVT
OVERVIEWS
The low-noise control valve with a built-in
pilot plug (EGVT) offers enhanced performance
of valve seat leakage and is used for high-pressure gaseous fluids. The valve plug has a built-in
pilot plug that enables rapid valve operation and
allows low valve operation force. The pilot plug
uses a simple springless mechanism moved by
inlet fluid pressure.
It is suitable for high-temperature, high-pressure steam turbines as a bypass control valve,
auxiliary steam pressure reducing valve, or
blow-off control valve.
SPECIFICATIONS
Body
Type
Straight through cast globe valve
Nominal size
4, 5, 6, 8 inches
Pressure rating
Packing
ANSI Classes 1500 and 2500*
Note) *: Only valve sizes 4, 5 and 6 inches are available.
Grease provided. Graphite packing is used.
Gasket
Type
Spiral-wound gasket
End connection
Flanged end (RF)
Flanged end
RF
RJ, LG
Material
Stainless steel (SUS316)
Pressure rating
Standard
JIS 63K
JIS B2217-1967
ANSI Class 900, 1500, 2500 ANSI B16.5-1968
JPI Class 900, 1500, 2500
JPI-7S-15-1993
ANSI Class 900, 1500, 2500 ANSI B16.5-1968
JPI Class 900, 1500, 2500
JPI-7S-15-1993
Trim
Valve plug
Cage guided built-in pilot plug
Linear (LV)
Welded end (BW)
Cage
Material
Multiple-orifice, single-stage variable-throttling, and
multiple orifice, single-stage, fixed-throttling.
SCPH 21, SCPH 32
Bonnet
Material
Plain bonnet (0 to +230 °C)
Extension bonnet (+230 to +566 °C)
SUS420J2 Stellite
Gland type
Bolted gland
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3rd Edition
No. SS2-EGV100-0002
Azbil Corporation
Actuator
Leakage specification
IEC 60534-4:1999 or JIS B 2005-4:2008
Class V
Type
Single acting diaphragm actuator
(Type HA or VA)
Hysteresis error
Within 1% of F.S. (with positioner)
Action
Linearity
Direct or reverse action
Within ±1% of F.S. (with positioner)
Diaphragm
Installed position to piping
Type HA
Cloth embedded ethylenepropylene rubber
Refer to Figure 2.
Finish
Type VA
Cloth embedded chloroprene rubber
Blue (Munsell 10B 5/10) or silver, or customer-specified
color
Spring range
80 to 240 kPa {0.8 to 2.4 kgf/cm2}
Table 1 Cv value and travels
Supply pressure
Nominal size (inch)
4
5
6
8
Port size (inch)
3 4 4 5 5 6 6 8
ANSI 9000
Rated Cv
50 88 88 135 135 200 200 350
ANSI 1500
value
ANSI 2500 45 80 80 125 125 180 - Rated travel (mm)
38
50
50
75
Type HA
270 to 390 kPa {2.8 to 4.0 kgf/cm2}
Type VA
270 kPa {2.8 kgf/cm2}
Air connection
Note) The tolerance for valve capacity is ±10% of the
rated Cv value.
Rc 1/4 or 1/4 NPT internal thread
Note) With type VA, Rc1/4 adapter or 1/4NPT adapter
is provided on Rc1/2 internal thread.
Flow characteristic
Ambient temperature
Valve action
Air-to-close (Direct action actuator is combined.)
Air-to-open (Reverse action actuator is combined.)
Optional accessories (installed to order)
Positioner, pressure regulator with filter, hand wheel, limit
switch, solenoid valve, motion transmitter; booster relay,
and others.
Note) For the optional accessories, refer to the specification sheets and installation drawings of respective accessories.
Additional Specifications
• Special inspections
Flow characteristic inspection, material inspection
(Material certificate), non-destructive inspections
• Double gland
• Copper-free treatment
• Special Air piping and joints
Cv value (%)
100
-30 to 70 °C
50
0
50
Travel (%)
100
Figure 1 Flow characteristics
Note) The above graphs indicate typical flow characteristic.
Performance
Rated Cv value
Refer to Table 1.
Inherent rangeability
30 : 1
Allowable differential pressure
Refer to Table 2 and Table 3.
-2-
Azbil Corporation
No. SS2-EGV100-0002
Allowable differential pressure
Table 2 Air-to-close
Pressure
rating
ANSI 900
ANSI 1500
Actuator
Supply pressure Spring range
kPa {kgf/cm²} kPa {kgf/cm²}
HA3D
HA4D
HA3D
ANSI 2500
HA4D
390
{4.0}
390
{4.0}
390
{4.0}
390
{4.0}
80 to 240
{0.8 to 2.4}
Differential pressure
kPa {kgf/cm²} (by Nominal size)
4
5
12700
{130}
19600
{200}
18600
{190}
19600
{200}
10800
{110}
18600
{190}
13700
{140}
19600
{200}
6
8
16700
{170}
12700
{130}
19600
{200}
Table 3 Air-to-open
Pressure
rating
Supply pressure Spring range
Actuator
kPa {kgf/cm²} kPa {kgf/cm²}
HA3R
ANSI 900
ANSI 1500
HA4R
VA5R
HA3R
ANSI 2500
HA4R
VA5R
270
{2.8}
270
{2.8}
270
{2.8}
270
{2.8}
270
{2.8}
270
{2.8}
80 to 240
{0.8 to 2.4}
Differential pressure
kPa {kgf/cm²} (by Nominal size)
4
5
6370
{65}
10800
{110}
14700
{150}
9320
{95}
16000
{160}
19600
{200}
5390
{55}
9320
{95}
12700
{130}
6860
{70}
11300
{115}
16000
{150}
6
8
8340
{85}
11300
{115}
6370
{65}
8830
{90}
9810
{100}
13200
{135}
Note) 1) Can be used for modulating application using positioner or On-off application.
2) Take care that the maximum allowable differential pressure does not exceed the highest working pressure in
ANSI B16, 34-1981
Flow
direction
Positioner
Side-mounted
hand wheel
Side-mounted
hand wheel
Flow
direction
No.1 (Standard type)
Positioner
Positioner
Flow
direction
Flow
direction
Flow
direction
Side-mounted
hand wheel
Positioner
Flow
direction
Side-mounted
hand wheel
Positioner
Flow
direction
Flow
direction
No.2
No.3
Note) Indicate position number when installation other than the standard type is required.
Figure 2 Actuator orientation
-3-
Side-mounted
hand wheel
Positioner
No.4
Please read the "Terms and Conditions" from the following URL before
ordering or use:
http://www.azbil.com/products/bi/order.html
Specifications are subject to change without notice.
1-12-2 Kawana, Fujisawa
Kanagawa 251-8522 Japan
URL: http://www.azbil.com/
3rd Edition: Issued in June 2012
No part of this publication may be reproduced or duplicated
without the prior written permission of Azbil Corporation.
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