Home
Yongjia Weilan Flow Control Equipment Co.,LTd.
Home  E-mail     
               
Home|About Us|Products|Facility|QA Equipment|Feedback|Download|Contact Us|中文版
Valve Series
Ball Valve
Gate Valve
Globe Valve
Check Valve
Butterfly Valve
Forged Valve
Strainer
Control Valve
Automatic Recirculation Valve
Pump Series
Air Operated Double Diaphragm Pump
Transfer Pump
Cleaning Machine
Others
Flange & Pipe Fitting
Valve Ball

ZDL Series Automatic Recirculation Valve

ZDL Series Automatic Recirculation Valve
Print this page
Bookmark this
E-mail Us
Live Messenger
Yahoo Messenger
Skype Me
PDF Download

ZDL SERIES AUTOMATIC RECIRCULATION VALVE BRIEFING INTRODUCTION:
Introduction
ZDL series Automatic Recirculation 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 Recirculation. Pressure reduced through the multistage bypass pressure reducing valve.
ZDL series 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 Recirculation Pump Protection Valve L type bypass assembly PN16=PN16
CLSS150LB=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 Recycle 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
 
Parts and material
 
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 weilan Valve technical department to get the latest product information. We can also produce according to your requirements.


Prev: ZDM Series Automatic Recirculation Valve
Next: Wedge Gate Valve

Home|About Us|Products|Facility|QA Equipment|Feedback|Download|Contact Us|中文版

Flanged Ball Valve|Floating Ball Valve|Trunnion Ball Valve|Forged Steel Ball Valve

© 2010 Yongjia Weilan Flow Control Equipment Co.,LTd.  Tel: +86-577-67321989, 67321569  Fax: +86-577-67337095

Add: Baishui Industrial Zone, Oubei Town, Yongjia, Wenzhou, Zhejiang, China 325105  E-mail: market@cnweilan.com, arden@cnweilan.com