ZDM series Automatic recycle valve

You are here: Home » Prodcuts » Automatic Recycle Valve
ZDM series Automatic Recycle valve

VIDEO GALLERY

CONTACT DATIAN

For further information, pricing or a brochure, please use the following link:

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

Introduction

ZDM 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.
ZDM series automatic recirculation valve is suitable for bypass with high pressure differential, maximum pressure differential is 30MPa, and specific choice is determined by factory. Multistage decompression type M type bypass can eliminate noise made by high-speed flow medium, prevent damage of cavitation erosion and braising to valve components.

Characteristic

  • Prevent cavitation multistage decompression bypass, reducing velocity, suitable for high pressure conditions
  • Forgde valve body, or you can choose carbon steel or stainless steel material, etc.
  • Standard bypass non-return function, maximum working pressure differential is 30MPa.
  • Pressure grade from PN16 to PN420, diameter from DN2to DN500.
  • Can select manual bypass operation function, used in fault.

Size and pressure range

  • Body type: Three-way forged valve
  • Nominal diameter: DN25, 32, 40, 50, 65, 80,100, 200, 250, 300, 350, 400, 450, 500
  • Nominal pressure: PN 16,25,40,64,100,160,250,420 CLASS 150, 300, 600, 900, 1500, 2500LB
  • End connection: Flange, FF, RF, RTJ, BW, SW etc.

Material temperature range

Body material
Sealing materuial
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
Stainless steel gasket -20~+300 -40~+300 -196~+300 -196~+300

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.

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 1.0 1.9 1.9 2.7 5.2 5.2 8.5 8.5 11 14 22 35

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

Model selection

ZD M Nominal pressure Body material Nominal diameter /Bypass diameter Structure type
Automatic Recycle pump protection valve M type bypass assembly PN16=PN16
Class 150LB
=CL150
C=A105
LC=LF2
P=304
PL=304L
R=316
RL=316L
D=Customrized material
DN50=50
NPS2”=2”
DN25=25 NPS1”=1” V = vertically mounted
H = horizontally mounted
S = Manual startup
Such as: M automatic recirculation valve, PN40,body material is WCB,main diameter DN50 bypass diameter DN25,(vertically mounted, Model: ZDM-PN40-C-50/25-V

Note

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

Installation

automatic recirculation valve should be installed nearby the centrifugal pump need Protect as soon as possible, and be better to install the outlet of pump.
Distance between pump outlet and inlet should not exceed 1.5 meters, in order to preventing from liquid pulsing cause low-frequency water attack. Medium flows from top to bottom. Priority should be installed vertically, also can be installed horizontally.

Maintenance

Maintenance and installation according manual provided, inspect the pump weekly in routine, and at the same time inspect valve functions.

Main parts and dimension

ZDM series Automatic recycle valve Main parts and dimension

NO Name Material NO Name Material
1 Body A105 F304 16 Disc setting 2Cr13 304
2 Disc EPDM EPDM 17 O ring EPDM EPDM
3 Guide ring 2Cr13 304 18 O ring EPDM EPDM
4 Valve plunger 2Cr13 304 19 Elastic cylindrical pin 2Cr13 304
5 Spring 60Si2Mn 1Cr18Ni9Ti 20 O ring EPDM EPDM
6 O ring EPDM EPDM 21 O ring EPDM EPDM
7 Guide block 2Cr13 304 22 Recycle body A105 F304
8 Bonnet A105 F304 23 Recycle cage 2Cr13 304
9 Nut 35 0Cr18Ni9 24 Recycle disc 2Cr13 304
10 Stud 45 0Cr18Ni9 25 O ring EPDM EPDM
11 Plunger pin 2Cr13 304 26 Orifice plate 2Cr13 304
12 Disc block 2Cr13 304 27 O ring EPDM EPDM
13 O ring EPDM EPDM 28 Nut 35 0Cr18Ni9
14 Bonnet 2Cr13 304 29 Bolt 45 0Cr18Ni9
15 Nut 0Cr18Ni9 0Cr18Ni9

Dimension and weight

DN(IN) PN(bar) CLASS DNB(IN) L(mm) S(mm) H(mm) 重量(Kg)
25
(1″)
10-16-25-40 150-300LB 25
(1″)
190 153 73 17
63-100 600 LB 250 182 90 32
32
(1″)
10-16-25-40 150-300LB 25
(1″)
190 153 73 19
63-100 600 LB 250 182 90 32
40
(11/2″)
10-16-25-40 150-300LB 25
(1″)
200 155 75 19
63-100-160 600-900 LB 260 190 90 32
250 1500LB 300 215 120 43
50
(2″)
10-16-25-40 150-300LB 25
(1″)
230 163 90 27
63-100-160 600-900 LB 300 185 115 41
250 1500LB 350 223 130 59
65
(21/2″)
10-16-25-40 150-300LB 40
(11/2″)
290 184 110 42
63 600 LB 340 219 125 60
100-160 900 LB 340 227 125 69
250 1500LB 400 260 145 89
80
(3″)
10-16-25-40 150-300LB 40
(11/2″)
310 191 115 52
63 600 LB 380 233 140 74
100-160 900 LB 380 240 140 84
250 1500LB 450 265 165 122
100
(4″)
10-16-25-40 150-300LB 50
(2″)
350 221 125 81
63 600 LB 430 258 155 112
100-160 900 LB 430 266 155 126
250 1500LB 520 300 190 106
125
(5″)
10-16-25-40 150-300LB 50
(2″)
400 266 135 122
63 600 LB 500 280 175 182
100-160 900 LB 500 291 175 207
250 1500LB 600 321 215 200
150
(6″)
10-16-25-40 150-300LB 65
(21/2″)
480 295 165 138
63 600 LB 550 350 190 273
100-160 900 LB 585 355 200 289
250 1500LB 700 405 250 444
200
(8″)
10-16-25-40 150-300LB 80
(3″)
600 395 200 241
63 600 LB 650 405 215 467
100-160 900 LB 680 430 225 501
250 1500LB 830 485 290 785
250
(10″)
10-16-25-40 150-300LB 100
(4″)
730 475 240 411
63 600 LB 775 520 260 714
100-160 900 LB 800 560 270 857
250 1500LB 900 560 310 1284
300
(12″)
10-16-25-40 150-300LB 125
(5″)
850 530 280 740
63 600 LB 900 550 300 930
100-160 900 LB 1050 650 360 1485
250 1500LB 1200 720 420 2100

※ Since product and technical innovation or some special requirements, connection size of various valves may change, please contact with Datian valve, We can also produce according to your required size.

Related Products