ZDT series Automatic Recycle valve

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ZDT series Automatic Recycle valve

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

Introduction

ZDT 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.
ZDT series automatic recirculation valve has big bypass, and this valve is suitable for bypass with big flow, maximum pressure differential is 4MPa, specific choice is determined by factory.

Characteristics

  • Simple structure, operation reliable and stabile, with few movement parts.
  • Be easy for installation, can be installed vertically or horizontally on pump pressure outlet.
  • Bypass flow is large, maximum flow is 60% of main flow, KV value can be adjusted.
  • Maximum bypass operating pressure differential is 4MPa. Bypass non-return function is optional.
  • Applicable medium including: water, oil, methanol and other liquid medium.
    Working temperature is from -196℃ to +300 ℃.

Diameter and pressure range

  • Valve body type: three-way casting valve
  • Nominal diameter: DN25, 32, 40, 50, 65, 80, 100, 200, 250, 300, 350, 400
  • Nominal pressure: PN 16, 25, 40, 64, Class 150, 300 L, etc.
  • Connection type: flange FF, RF, RTJ, BW, SW etc .

Material temperature range

Body material
Sealing material
WCB LCB/LCC CF8 CF8M
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 NO.

ZD T Nominal pressure Body material Main
diameter
/Bypass diameter Structure type
Auto
recirculation
pump
protection
valve
T type
bypass
assembly
PN16=PN16
CLSS150
LB=CL150
C=WCB
LC=LCB
P=CF8
PL=CF3
R=CF8M
RL=CF3M
D=Customed
DN25=25
NPS1”=1”
DN25=25
NPS1”=1”
V=vertically mounted
H=Horizontally mounted
Z=Bypass non-return
D=With discharge mouth
Such as: T type automatic recirculation valve, pressure is PN40, body material is WCB, main diameter DN50, Bypass diameter DN 25, vertically mounted, Model: ZDT-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 and small wear.
  • Check: automatic recirculation valve also has check valve effect, preventing the liquid backflow to pump body. Bypass non-return function is optional.
  • Special bypass size can be customized. The max flow rate of bypass is subject to the max 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 80 80 100 100 150
in 1/2 3/4 3/4 1 11/2 11/2 2 3 3 4 4 6
Max bypass Kv Cv 2.3 4.6 4.6 6.9 18.5 18.5 34.7 69.3 69.3 116 116 170

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

ZDT series automatic recirculation valve

Parts and material

NO Name Material NO Name Material
1 Body WCB CF8 11 O ring EPDM EPDM
2 Recycle disc 2Cr13 304 12 Stud bolt 45 0Cr18Ni9
3 Recycle seat 2Cr13 304 13 Hex nut 35 0Cr18Ni9
4 Screw gland 2Cr13 304 14 Bonnet WCB CF8
5 O ring EPDM EPDM 15 Guide block 2Cr13 304
6 Main disc 2Cr13+STL 304+STL 16 Bushing 2Cr13 304
7 O ring EPDM EPDM 17 Porous set 2Cr13 304
8 Gasket 2Cr13 304 18 End ring 2Cr13 304
9 Hexagon nut 304 304 19 Spring 2 60Si2Mn 1Cr18Ni9Ti
10 Spring 60Si2Mn 1Cr18Ni9Ti

Dimension and weight

Valve specification
DNP DNR
Size mm(in) Bypass Weight Kg
PN10/16/25
150lbs
PN40/64
300lbs
S H L (DNB)
25( 1″) 115 102 267 15 12 18
32( 11/4″) 115 102 267 20 14 20
40( 11/2″) 115 102 267 20 14 20
50( 2″) 130 108 305 25 22 26
65( 21/2″) 165 127 381 40 46 51
80( 3″) 181 127 381 40 46 51
100( 4″) 209 159 495 50 105 118
125( 5″) 267 220 575 80 143 156
150( 6″) 267 220 575 80 220 240
200( 8″) 300 220 600 100 255 302
250( 10″) 356 305 780 100 400 455
300( 12″) 530 280 830 150 590 650

※ 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.

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