Special-Purpose Valve Multistage Pressure-Reduction Control Valve Model EGVM / EAVM

No. SS2-EGV100-0001
Special-Purpose Valve
Multistage Pressure-Reduction
Control Valve
Model EGVM / EAVM
OVERVIEWS
The multistage pressure-reduction control valve
has a three-stage, contoured pressure-reduction
mechanism and a two-stage, Multiple-orificecage pressure-reduction mechanism in its trim
and is used to control high differential pressure
fluid flow. The multistage pressure-reduction
mechanism effectively consumes energy and
thereby suppresses cavitation that would otherwise occur due to a steep pressure drop. The
throttling passage is simple in construction and
this prevents scale from depositing or clogging.
The multistage pressure-reduction mechanism
operates over the entire range from fully closed
to fully open.
It is most suitable as a recirculation control
valve on a boiler feed water pump or a pressurereduction valve for high-pressure reactants.
SPECIFICATIONS
Body
Packing
Grease provided. Graphite packing isused.
Type
Gasket
EGVM : Straight-through, forged globe valve
EAVM : Angle type, forged globe valve
Type
Spiral wound, Serrated
Nominal size
Material
Graphite, Stainless steel (SUS316), (PTFE)
Note) PTFE: Polytetrafluoroethylene
1½, 2, 3, 4, 5, 6, 8 inches
Pressure rating
ANSI Classes 1500 and 2500
Trim
End connection
Valve plug
Stud-bolted end (RF, RJ)
Welded end BW (3 to 8 inches)
Single-seat, three-stage contoured
Equal percentage (%C)
Linear (LC)
Material
JIS SFVA F11A, F22B, F5B
ASTM A182 F5, F11, F22
Cage
Multiple-orifice design, single stage, variable-throttling, and
Multiple-orifice design, single stage, fixed-throttling.
Bonnet
Plain bonnet (0 to 230 °C)
Material
Gland type
SUS440C, SUS630, SUS316 Stellite (#1, #6)
Bolted gland
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4th Edition
No. SS2-EGV100-0001
Azbil Corporation
Actuator
Table 1 Cv value and travels
Type
Nominal size (in.)
Rated Cv ANSI
value
1500
ANSI
2500
Rated travel (mm)
Double acting piston actuator (Model DAP)
Action
Direct-action or reverse-action
Supply pressure
490 kPa {5.0 kgf/cm2}
8 *1
1½
2
3
4
6
5 5 10 16 25 25 35 50 70 (110)
2.5 2.5 6.3 10 16 16 25 35 50 (80)
14.3
14.3 25.0 *2 25.0
37.5
50
*1: Valve size 8 in. series uses an electric actuator.
*2: For ANSI 2500 and Cv=10, the rated travel is
14.3 mm
Air connection
Rc 1/4
Ambient temperature
Flow characteristic
-30 to 70°C
A pneumatic diaphragm actuator or an electric actuator
can also be installed to order.
Valve action
Air-to-close (Used with direct action actuator configuration)
Air-to-open (Used with reverse action actuator configuration)
Optional Accessories
Cv value (%)
100
50
Positioner, pressure regulator with filter, hand wheel, limit
switch, solenoid valve, motion transmitter, booster relay,
air failure backup or lock system, and others.
Note) For optional items, refer to the specification
sheets and installation drawings of respective
accessories.
0
50
100
Travel (%)
Additional Specifications
Figure 1
• Special inspections
Flow characteristic inspection, material inspection
(material certificate), non-destructive inspections
• Special Air piping and joints
Flow characteristics - Equal percentage
(%C)
100
Cv value (%)
Performance
Rated Cv value
Refer to Table 1.
Inherent rangeability
30:1
50
Allowable differential pressure
Refer to Table 2.
Leakage specification
IEC 60534-4:1999 or JIS B 2005-4:2008
Class V
0
Hysteresis error
Figure 2
Within 1% of F.S. (with positioner)
Linearity
Within ±1% of F.S. (with positioner)
Finish
Blue (Munsell 10B 5/10) or silver, or customer-specified
color
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50
Travel (%)
Flow characteristics - Linear (%)
100
Azbil Corporation
No. SS2-EGV100-0001
Allowable differential pressure (Air-to-close and Air-to-open)
Table 2 Pressure rating of ANSI Class 1500
Pressure
rating
ANSI 1500
kPa {kgf/cm²} by rated Cv values
Actuator
Supply pressure
kPa {kgf/cm²}
5
10
16
25
DAP560
490
{5.0}
26000
{265}
26000
{265}
20100
{205}
12700
{130}
DAP1000
490
{5.0}
26000
{265}
DAP1500
490
{5.0}
35
50
21600
{220}
15200
{155}
11300
{115}
26000
{265}
23500
{240}
16700
{170}
70
11300
{115}
Table 3 Pressure rating of ANSI Class 2500
Pressure
rating
ANSI 2500
kPa {kgf/cm²} by rated Cv values
Actuator
Supply pressure
kPa {kgf/cm²}
2.5
6.3
10
16
25
DAP560
490
{5.0}
42700
{435}
42700
{435}
32400
{330}
20100
{205}
12700
{130}
DAP1000
490
{5.0}
42700
{435}
34300
{350}
DAP1500
490
{5.0}
42700
{435}
35
50
21600
{220}
15200
{155}
11300
{115}
33300
{340}
23500
{240}
16700
{170}
Note) 1) Positioner is necessary.
2) If a pneumatic backup system is used as a provision against air supply failures, base valve selection on either
the normal supply air pressure or the set point of the backup system pressure (the trip pressure), whichever is
lower.
3) Take care that the maximum allowable differential pressure does not exceed the highest working pressure in
ANSI B16.34-1981
4) Take care that the inlet pressure (P1) does not exceed the allowable differential pressure for a closed valve.
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Please, read ‘Terms and Conditions’ from following URL before
the order and 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
http://www.azbil.com/
4th Edition: Jun. 2015
No part of this publication may be reproduced or duplicated
without the prior written permission of Azbil Corporation.
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