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Details Explanation

ZSHWB/ZDRWB series double eccentric butterflyvalveThe valve plate and sealing ring of the high-performance butterfly valve adopt a unique eccentric structure, which has the characteristics of compact structure, good cutting performance, and long service life, and has both regulating and cutting functions. Widely used in industrial sectors such as chemical, power, textile, food, medicine, papermaking, as well as municipal engineering, water plants and other pipelines to cut off or regulate flow control of tap water, sewage, oil liquids or media such as air, coal gas, natural gas, and water vapor.

The nominal pressure ratings of this series of products are PN (MPa) 0.6, 1.0, 1.6, 4.0; Applicable fluid temperature -60~+450 ℃; The metal sealing type has a sealing grade of IV, and the soft sealing type has a sealing grade of VI, achieving zero leakage; The traffic characteristics are approximately equal percentages.

FEATURES

  • The valve body adopts integral casting technology, with a compact structure, small volume, and light weight;
  • Double eccentric installation of valve plate. When closed, the valve plate expands outward to achieve the optimal peripheral sealing state; When opened, the valve plate and sealing ring quickly detach, effectively preventing the sealing ring from wearing out;
  • The sealing ring design is innovative, concise, and maintenance free;
  • There are two types of sealing ring forms to choose from: soft sealing and metal sealing, to meet the requirements of different working conditions;
  • Due to the use of an eccentric structure, the operating torque is greatly reduced;
  • Low flow resistance, high rated flow coefficient, about three times that of a single seat valve of the same caliber;
  • Strong self-cleaning ability and long service life;
  • The valve adopts a flange free structure, and the process pipeline adopts a clamp type installation;
  • The three major types of standard actuators (pneumatic piston type, electric) are interchangeable.

Basic structure and sealing ring form

A. Enhance F4 sealing ring type valve seat

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1. Valve plate 2, sealing ring 3, pressure ring 4, valve body

B. Elastic metal sealing ring valve seat

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1. Valve plate 2, sealing ring 3, pressure ring 4, valve body

C. Eccentricity principle

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1. Valve plate 2, sealing ring 3, pressure ring 4, valve body

The eccentric butterfly valve design has two eccentricities: the rotation axis of the valve plate deviates from the center of the sealing surface section of the valve plate (a); The rotation axis deviates from the center of the pipeline (b).

When opened, all points on the sealing surface of the valve plate simultaneously detach from the sealing ring, and there is no compression between the valve plate rotation and the sealing ring, which improves the service life of the sealing ring. Maintain an automatically adjustable optimal sealing effect on the sealing surface. Using rubber and reinforced polytetrafluoroethylene sealing rings, with a leakage level of VI, achieving zero leakage. Elastic metal stainless steel sealing ring can be used in high temperature and other demanding work environments.

Main performance indicators

Serial Number project Pneumatic double eccentric butterfly valve Electric double eccentric butterfly valve
1 Basic error<(%) ±2.5 ±2.5
2 Return difference<(%) 2.5 2.0
3 Dead zone<(%) 2.0 3.0
4 Constant point deviation<(%) Starting point ±2.0 ±1.5
End
5 Rated angle deviation ＜ (%) +2.5 +0.5
6 Deviation of rated flow coefficient ＜ (%) +10

Note: The performance indicators of this product comply with GB/T4213-2008.

1. Rated flow coefficient

Nominal diameter DN (mm) 50 65 80 100 125 150 200 250 300 350
Rated flow coefficient Kv 100 150 200 405 620 1150 2030 3150 4550 6200
Pneumatic piston type Single action 83 83 100 100 125 143 160 190 210 240
Torque (Nm) 20 20 50 50 100 200 300 400 600 1000
Double action 63 63 83 83 100 125 143 160 190 210
Torque (Nm) 20 20 50 50 100 200 300 400 600 1000
Nominal diameter DN (mm) 400 450 500 600 700 800 900 1000 1200
Rated flow coefficient Kv 8100 10260 13500 19800 27000 35700 44600 55080 81000
Pneumatic piston type Single action 270 270 300 300 350 400 HAW35S HAW40S HAW50S
Torque (Nm) 1600 1600 2000 2000 2500 3600 6100 8700 14000
Double action 240 240 240 240 270 300 350 400 HAW35
Torque (Nm) 1900 1900 1900 1900 2600 3500 5700 8100 16000

2. Main technical parameters

Nominal diameter DN (mm) DN50～1200
Nominal pressure PN (MPa) 0.6, 1.0, 1.6, 4.0 (DN80~400)
Inherent flow characteristics Approximately equal percentage
Inherent adjustable ratio R 50
Rated angle (°) 80
Pneumatic actuator form Single acting, double acting
Gas source pressure (MPa) The recommended air source pressure for the actuator is 0.5MPa
supply voltage 220V. AC 50Hz 380V AC 50Hz (three-phase)
Input signal 4～20mA. DC, 0-10mA. DC, 1-5V. DC or above signal split range control
Connection form wafer type
Working temperature (℃) Carbon steel: -20~425 ℃, stainless steel:- 40～595℃

Note: 1. Special requirements can be produced according to customer specifications;

2. Flanges can be manufactured according to flange standards such as ANSI and JIS.

Temperature and pressure range for the use of valve body and valve cover materials

Table 4 Unit: kgf/cm2

pressure

temperature

 PN16 PN40 PN64
WCB CF8 WCB CF8 WCB CF89
-196～-20 — 16.0 — 40.0 — 64.0
-20～100 16.0 16.0 40.0 40.0 64.0 64.0
150 16.0 16.0 40.0 40.0 64.0 64.0
200 16.0 16.0 40.0 40.0 64.0 64.0
250 14.0 15.0 36.0 38.0 56.0 60.0
300 12.5 14.0 32.0 36.0 50.0 56.0
350 11.0 13.2 28.0 34.0 45.0 53.0
400 10.0 12.5 25.0 32.0 40.0 50.0
425 9.0 12.0 22.0 30.7 36.0 48.4
450 6.7 11.5 17.0 29.5 26.5 46.8
500 — 10.5 — 26.5 — 42.5
525 — 9.9 — 24.6 — 39.2
560 — 9.0 — 22.0 — 36.0

Operating temperature range and valve seat leakage of the whole machine

Valve body WCB、CF8、CF8M
Valve plate CF8、CF8M CF8、CF8M + Stellite
sealing ring PTFE 304
Pressing ring WCB、CF8、CF8M
Packing material Polytetrafluoroethylene, flexible graphite
shim Graphite winding pad F4
Leakage level Grade VI Grade IV
Valve seat leakage rate (l/h) Microbubble level① 10-4×Kv
Temperature range (℃) -20～200 -20～450

Equipped with pneumatic piston actuator (single acting), allowable differential pressure gauge unit: MPa

DN

mm

 actuator 75 83 100 125 143 160 190 210 240 270 300 350 400 HAW35S HAW40S HAW50S
Torque (Nm) 30 40 80 125 230 320 550 677 1000 1612 1929 2700 3600 6100 8700 14000
50 soft seal 1.0 2.0
metal seal 0.5 1.0 1.8
65 soft seal 0.6 1.1 2.5
metal seal 0.2 0.6 1.0 1.6
80 soft seal 0.4 1.0 2.0
metal seal 0.4 0.8 1.2
100 soft seal 0.6 1.0 2.0
metal seal 0.3 0.8 1.6
125 soft seal 0.4 0.9 2.0
metal seal 0.4 1.0 1.6
150 soft seal 0.4 1.0 2.2
metal seal 0.3 1.0 2.0
200 soft seal 0.2 0.6 1.6
metal seal 0.2 0.8 1.6
250 soft seal 0.2 1.2 2.5
metal seal 0.3 0.6 2.0
300 soft seal 0.6 1.4 2.5
metal seal 0.2 0.6 1.6
350 soft seal 0.6 1.1 2.2
metal seal 0.2 0.6 1.2
400 soft seal 0.2 0.8 2.0
metal seal 0.1 0.6 1.0 1.6
450 soft seal 0.6 1.2 2.0
metal seal 0.2 0.6 1.6
500 soft seal 0.2 0.6 1.6 2.0
metal seal 0.3 0.6 1.2 2.0
600 soft seal 0.4 1.0 1.3 1.8
metal seal 0.3 0.6 1.6
700 soft seal 0.4 0.9 2.0
metal seal 0.2 0.6 1.4
800 soft seal 0.3 0.8 1.8
metal seal 0.4 1.2 2.0
900 soft seal 0.5 1.6
metal seal 0.4 1.0
1000 soft seal 0.3 1.2
metal seal 0.3 0.8
1200 soft seal 0.4 1.0
metal seal 0.4

Note: 1) The gas source pressure is calculated at 0.5MPa;

2) The allowable pressure difference in the table is the standard configuration value of our company, and a larger torque actuator can be selected according to the user's operating conditions.

Equipped with pneumatic piston actuator (double acting), allowable differential pressure gauge unit: MPa

DN

(mm)

 actuator 75 83 100 125 143 160 190 210 240 270 300 350 400 HAW35
Torque (Nm) 50 70 113 275 433 650 900 1185 1787 2700 3500 5700 8100 16000
50 soft seal 2.5
metal seal 1.6
65 soft seal 2.2 3.0
metal seal 0.6 1.2
80 soft seal 0.8 2.0
metal seal 0.4 1.2
100 soft seal 1.0 2.2
metal seal 0.2 0.8 1.6
125 soft seal 0.2 1.0 2.0
metal seal 0.6 1.0 1.6
150 soft seal 0.2 1.0 1.5 2.2
metal seal 0.8 1.2 2.5
200 soft seal 0.8 1.6 2.5
metal seal 0.2 0.8 1.8
250 soft seal 0.4 1.6 2.5
metal seal 0.4 1.0 2.5
300 soft seal 0.2 1.2 2.2
metal seal 0.1 1.0 1.8
350 soft seal 0.8 2.0
metal seal 0.4 0.8 2.0
400 soft seal 0.4 1.6 2.5
metal seal 0.2 0.6 1.6
450 soft seal 0.3 1.0 1.8 2.2
metal seal 0.8 1.2
500 soft seal 0.8 1.4 1.8
metal seal 0.3 1.0 1.4
600 soft seal 0.4 1.1 1.4 1.8
metal seal 0.2 0.7 1.2 2.0
700 soft seal 0.4 0.9 2.0
metal seal 0.2 0.6 1.4
800 soft seal 0.3 0.8 1.8
metal seal 0.4 1.2 2.0
900 soft seal 0.5 1.6
metal seal 0.4 1.0
1000 soft seal 0.3 1.2
metal seal 0.3 0.8
1200 soft seal 0.4 1.0
metal seal 0.4

Note: 1) The gas source pressure is calculated at 0.5MPa;

2) The allowable pressure difference in the table is the standard configuration value of our company, and a larger torque actuator can be selected according to the user's operating conditions.

Allowable differential pressure gauge for electric actuator unit: MPa

DN

(mm)

 actuator 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
Torque (Nm) 50 100 200 300 400 600 1000 1200 2000 2500 3500 5000 5200 6000 8000 16000
50 soft seal 1.0 2.5
metal seal 0.6 1.6
65 soft seal 0.9 2.2
metal seal 0.2 1.0
80 soft seal 0.8 2.0
metal seal 0.8 1.4
100 soft seal 0.2 1.0 2.2
metal seal 0.2 0.8 1.6
125 soft seal 0.2 1.0 2.0
metal seal 0.6 1.0 1.6
150 soft seal 0.2 1.0 1.5 2.2
metal seal 0.8 1.2 2.5
200 soft seal 0.8 1.6 2.5
metal seal 0.2 0.8 1.8
250 soft seal 0.4 1.6 2.5
metal seal 0.4 1.0 2.5
300 soft seal 0.2 1.2 2.2
metal seal 0.1 1.0 1.8
350 soft seal 0.6 2.0
metal seal 0.4 0.8 2.0
400 soft seal 0.4 1.6 2.5
metal seal 0.2 0.6 1.6
450 soft seal 0.3 1.0 1.8 2.2
metal seal 0.8 1.2
500 soft seal 0.8 1.7 2.0
metal seal 1.0 1.4
600 soft seal 0.6 1.1 1.4 1.8
metal seal 0.8 1.2 2.0
700 soft seal 0.4 0.9 1.4 2.0
metal seal 0.2 0.6 1.0 2.0
800 soft seal 0.3 0.8 1.2 1.8
metal seal 0.2 0.6 1.0 2.0
900 soft seal 0.2 1.8 1.1 1.8
metal seal 0.2 0.6 1.4
1000 soft seal 0.2 0.8 1.5
metal seal 0.4 1.0
1200 soft seal 0.6 1.6
metal seal 0.4

Note: 1) The allowable pressure difference in the table is the standard configuration value of our company, and a larger torque actuator can be selected according to the user's operating conditions.

Double eccentric butterfly valve selection sample download