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Electric two seat control valve


Product model: ZAZN

Nominal diameter: DN20 ~ 300mm

Nominal pressure: PN1.6 ~ 6.4Mpa

Working temperature: - 40 ~ 230 ℃ (constant temperature type), heat sink 230 ~ 450 ℃ (medium temperature type), special order - 100 ~ 600 ℃

Main materials: WCB(ZG230-450)、ZG1Cr18Ni9Ti、ZG0Cr18Ni12Mo2Ti CF8 CF8M

Applicable medium: liquid, gas, steam, etc

Flange size: comply with JB78-59 and JB79-59 standards, and can be in accordance with JB / 79.1-94, JB, ANSI, JIS, DIN and other standards



PRODUCT OVERVIEW

The electric double seat regulating valve is composed of DKZ type direct electric actuator and straight through low flow resistance double seat valve. The valve core is stable and reliable in the process of displacement. There are two valve seats and two plunger valve cores in the valve body. The fluid medium flows out through the upper and lower valve core valve seats. It is a balanced double seat valve with large flow, large allowable differential pressure and small unbalanced force, It is applicable to the occasions where the medium is not very clean and the leakage requirements are not strict. It is widely used in automatic regulation and remote control of industrial production processes such as chemical industry, petroleum, metallurgy, power station, light textile, papermaking and pharmacy.

 

电动双座调节阀(图1)

 


MAIN TECHNICAL PARAMETERS OF ACTUATOR

Model
DKZ-310/310C
DKZ-410/410C
DKZ-510/510C
Thrust N
4000
6400
16000
Trip
10
16
25
30
18
30
40
60
30
50
60
100
Full travel times
8
12.5
20
24
15
24
32
48
16
30
37
62
 
MAIN PERFORMANCE INDEXES
project
Index
Basic error%
≤±5.0
Return difference%
≤3.0
Deadband%
≤3.0


Leakage
Two seat valve
10-3×Rated capacity of valve
Sleeve valve
10-3×Rated capacity of valve


ALLOWABLE DIFFERENTIAL PRESSURE

Usage
When the valve core is in the flow open state, the pressure behind the valve when it is closedP2＝0
Nominal diameterDN(mm)
Seat diameterDN(mm)

Executing agency

Effective thrust

（N）
Allowable differential pressure(MPa)
PN1.6(MPa)
PN6.4(MPa)
20
10
12
15
20
400,1000,2500
Nominal pressure
3.8
2.7
1.7
1.0
Nominal pressure
4.3
2.5
25
26
400,1000,2500
0.5
Nominal pressure
0.6
3.6

32
32
0.4
Nominal pressure
0.4
2.3

40
40
400,1000
2500，6400
0.7
1.0
0.7
1.5

50
50
0.5
1.0
0.5
1.0

65
66
6400，16000
1.4
1.4
80
80
1.0
1.0
100
100
0.6
0.6
125
125
6400，16000
0.5
1.0
0.5
1.0
150
150
0.3
0.7
0.3
0.7
200
200
0.2
0.4
0.2
0.4
250
250
16000
0.3
0.3
300
300
0.2
0.2


MATERIAL OF MAIN PARTS, APPLICABLE TEMPERATURE AND MEDIUM

Material code
C（WCB）
P（304）
R（316）
 
Main parts
Valve body and bonnet
WCB（ZG230-450）
ZG1Cr18Ni9Ti（304）
ZG1Cr18Ni12Mo2Ti（316）
Valve core and valve seat
1Cr18Ni9Ti（304）Or Stellite surfacing1Cr18Ni9Ti（304）Or Stellite surfacing
1Cr18Ni12Mo2Ti(316)Or Stellite surfacing
Valve stem
2Cr13
1Cr18Ni9Ti
1Cr18Ni12Mo2Ti
Filler
V-type polytetrafluoroethylene (F4), flexible graphite, stainless steel bellows
shim
Reinforced polytetrafluoroethylene (F4), stainless steel gasket, metal graphite spiral wound gasket
Push rod, bushing
2Cr13
 
Applicable working conditions
Applicable media
Steam oil gas liquidNitrate alkali corrosive gas and liquidNitrate alkali corrosive gas and liquid
Normal temperature type
-30～+250  F4：≤200℃-40～+250  F4：≤200℃-40～+250℃ F4：≤200℃
High temperature type
-30～+450℃-40～+450℃-40～+450℃

















FLOW CHARACTERISTIC DIAGRAM


电动双座调节阀(图5)


MAIN TECHNICAL PARAMETERS

Nominal diametermm
20
25
32
40
50
65
80
100
125150
200
250
300
Seat diametermm
20
25
32
40
50
65
80
100
125
150
200
250
300

Rated flow coefficient Kv

Double seat

10
16
25
40
63
100
160
250
400
630
1000
1600
Sleeve
Total quantity

15

35
50

125
190

400
630


0.6

9

20
30

75
115

240
350


Rated strokeL（mm）
10
16
25
40
60
100
Actuator model
DKZ-310
DKZ-310
DKZ-310
DKZ-410
DKZ-410/510
DKZ-510
Output shaft thrustN.m
4000
4000
4000
6400
6400/16000
16000
Full travel timeS
8
12.5
20
32
48/37
62
supply voltage
AC220V 50Hz
Input signal
4～20mA DC 0～10mA DC
Input impedance
Ⅱtype：200Ω　Ⅲtype：250Ω
Action mode
Electric open type (k) and electric close type (b)
Flow characteristics
Equal percentage, straight line, quick opening
Allowable leakage (L / h)
Double seat≤10-3×Rated capacity；Sleeve:≤10-3×Rated capacity
Inherent adjustable ratio R
30:1
Nominal pressure PN (Mpa)
1.6   2.5   4.0   6.4


             电动双座调节阀(图6)


MAIN OVERALL CONNECTION DIMENSIONS

Nominal diameterDN
A×B
L
H
H1
ZAZNDouble seat
PN1.6
PN4.0
PN6.4
Common type
Hot plate type
ZAZP
ZAZN
20
230×460
180
185
190
/
/
91
/
25
185
190
205
670
820
112
104
32
200
210
220
673
823
118
107
40
220
230
240
693
843
129
126
50
250
255
265
698
848
144
131
65
230×530
275
285
295
799
959
175
175
80
305
310
325
809
969
191
190
100
350
355
370
821
981
195
202
125
260×630
410
425
440
872
1087
243
250
150
450
460
475
882
1097
251
260
200
550
560
570
924
1139
290
302
250
670
690
750
1156
1368
380
422
300
740
785
815
1215
1427
435
484

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