ZDL series Automatic Recycle valve

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ZDL series Automatic Recycle valve

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Category: Automatic Recycle Valve. Tags: arc valve, automatic recycle valve

Introduction

ZDL series automatic recirculation valve (ARC valve) is a kind of pump protection device. It automatic protect centrifugal pump when pump body occur cavitation damage or unstable (especially conveying hot water at low load operation medium). Once pump flow is lower than the preseted flow, bypass can completely open to ensure the minimum required flow pump. Even running fully closed, namely running flow is zero, the minimum flow can also pass bypass for Automatic Recycle. Pressure reduced through the multistage bypass pressure reducing valve.
ZDL series automatic recirculation valve is suitable for bypass with medium or low pressure differential, maximum pressure differential is 6MPa, and specific choice is determined by factory.
Unique L bypass can eliminated noise by made high-speed flow medium, and prevent cavitation.

Characteristics

  • Multi-cage type bypass, low noise, suitable for medium and low pressure working conditions.
  • Forged valve body, can choose carbon steel or stainless steel material, etc.
  • Standard bypass non-return function, maximum working pressure differential is 6MPa.
  • With venturi port main flow non-return structure, adapt to complicated conditions.
  • Pressure grade from PN16 to PN100, diameter from DN2to DN500.
  • Can select manual bypass operation function, used in fault.

Size and pressure range

  • Body type: Three-way forged body.
  • Nominal diameter: DN25, 32, 40, 50, 65, 80,100, 200, 250, 300, 350, 400, 450, 500.
  • Nominal pressure: PN 16, 25, 40, 64, 100 CLASS 150, 300, 600 LB.
  • End connection: Flange, FF, RF, RTJ, BW,SW etc.

Material applicable temperature

Body material
Sealing material
A105 LF2 F304 F316
NBR -20~+100 -30~+100 -30~+100 -30~+100
FKM -20~+200 -40~+200 -40~+200 -40~+200
PTFE -20~+230 -40~+230 -80~+230 -80~+230
SS winding gasket -20~+300 -40~+300 -196~+300 -196~+300

Model

ZD L Nominal pressure Body material Nominal diameter /Bypass diameter Structure type
Automatic
Recycle
Pump
Protection
Valve
L type
bypass
assembly
PN16=PN16
CLSS150
LB=CL150
C=WCB
LC=LCB
P=CF8
PL=CF3
R=CF8M
RL=CF3M
D=Customed material
DN25=25
NPS1”=1”
DN25=25 NPS1”=1” V = Vertically mounted
H = Horizontally mounted
S = manual startup
Such as: L type automatic recirculation valve, pressure is PN40, body material is WCB,Main diameterDN50, bypass diameter DN25, vertically mounted,Model: ZDL-PN40-C-50/25-V

Working principle

According to the difference of inductive main flow, main valve disc check cone of automatic recirculation valve will automatically move to a certain position. At the same time the main valve disc drive bypass valve stem, transfer the movement of main valve disc to bypass, through control bypass valve disc position, change bypass throttling area, so as to control bypass flow. When main valve disc back into valve seat closed, all flow backflow through bypass. When mian valve disc to rise to top position, bypass is fully closed, all the flow of pump flow to process system. This valve set four functions in one body.

  • Flow perception: automatic recirculation valve main valve disc can automatically perceive main flow of process system, thereby according to the flow to determine position of mian valve disc and bypass disc.
  • Recirculation control: automatic recirculation valve can inhaled pump normal operation required minimum flow into storage device through bypass, so as to adjust pump H – Q characteristics, to realize recycling.
  • Bypass multistage pressure reducing: bypass control system can reduced the backflow medium from high-pressure pump outlet to appropriate backflow to low-pressure storage device with low noise small wear.
  • Check: automatic recirculation valve also has check valve effect, preventing the liquid backflow to pump body. Bypass non return function is standard.
  • Special bypass size can be customized. The max flow rate of bypass is subject to the max Kv value.

Note

Other bypass size can be made according to requirements, maximum bypass flow depends on maximum Kv value.

Size

Valve size mm 25 32 40 50 65 80 100 125 150 200 250 300
in 1 11/4 11/2 2 21/2 3 4 5 6 8 10 12
Max main flow m3/h 12 28 30 50 100 114 200 400 455 750 1250 1650
Bypass size mm 15 20 20 25 40 40 50 50 65 80 100 125
in 1/2 3/4 3/4 1 11/2 11/2 2 2 21/2 3 4 5
Max bypass Kv Cv 1.6 2.9 2.9 3.7 6.8 6.8 12.3 12.3 21.7 31 51 86

Note: Valve mian ouelet size depends on the outlet size of pump.

Main parts and out form dimension

ZDL series automatic recirculation valve Main parts and out form dimension

Parts and materials

NO Name NO Name NO Name NO Name
1 Body 7 Stud bolt 13 O ring 19 Control head
2 Guide ring 8 Hex nut 14 Pin 1 20 Multi-hole
sleeve
3 Main valve disc 9 Guide screw
Guide pin
15 Pin 2 21 Spring 2
4 Leverage 10 Bonnet 16 Double-head
stud B type
22 Slide Ring
5 Spring 1 11 Turn arm 17 Hex nut 23 Bypass valve
body
6 O ring 12 Control slide 18 Oring

Dimension and weight

DN PN(bar) DNB L(mm) A(mm) H(mm) Weight(Kg)
25 10-16-25-40 25 190 153 73 17
63-100 250 182 90 32
32 10-16-25-40 25 190 153 73 19
63-100 250 182 90 32
40 10-16-25-40 25 200 155 75 19
63-100-160 260 190 90 32
50 10-16-25-40 25 230 163 90 27
63-100-160 300 185 115 41
65 10-16-25-40 40 290 184 110 42
63-100-160 340 219 125 60
80 10-16-25-40 40 310 191 115 52
63-100-160 380 233 140 74
100 10-16-25-40 50 350 221 125 81
63-100-160 430 258 155 112
125 10-16-25-40 50 400 266 135 122
63-100-160 500 280 175 182
150 10-16-25-40 65 480 295 165 138
63-100 550 350 190 273
200 10-16-25-40 80 600 395 200 241
63-100 650 405 215 467
250 10-16-25-40 100 730 475 240 411
63-100 775 520 260 714
300 10-16-25-40 125 850 530 280 740
63-100 900 550 300 930

※ Since product innovation and technical innovation or some special requirements, various valve connecting size may change, please contact Datian Valve technical department to get the latest product information. We can also produce according to your requirements.

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