Three-dimensional eccentric butterfly valve
The butterfly valve is a kind of high-level control valve with
right angle rotation. It can be used as a regulating valve or as an
on-off valve. The long-life energy-saving butterfly valve developed
by our company adopts the three-dimensional eccentric principle
design, which makes the space movement track of the sealing surface
idealized, and solves the shortcoming that the traditional
eccentric butterfly valve is still in sliding contact friction when
the opening and closing is 0° 10°. The sealing plate is separated
at the instant of opening, and the contact is sealed when closed,
thereby prolonging the service life and is suitable for controlling
gas, solid particles and liquid. This product is widely used in the
automatic control system of chemical, petroleum, chemical fiber,
electric power, metallurgy, pharmaceutical, environmental
protection, papermaking and other industrial sectors.
Design Feature
Self-lubricating bearing
The valve stem is fixed by double bearings. The bearing is made of
a special process of sintering copper on a stainless steel surface
and then rolling PTFE on the copper surface. It has excellent wear
resistance and self-lubricating function, which avoids the valve
stem and bearing seizure phenomenon in the long-term use of the
valve.
Valve body
The valve body adopts a thin design, which is beautiful and light
in appearance, small in size, light in weight and low in material
consumption. It is more economical than other caliber valves.
Valve stem
The outer circle is made of coreless grinding, and the friction
coefficient between the filler and the packing is small. The
friction loss is minimized, and the valve opening and closing
torque is greatly reduced.
Valve plate
The three-dimensional eccentric design provides a mechanical seal
that allows the seal to be independent of its differential
pressure. A good seal is guaranteed even at very low differential
pressures.
Seal ring
Adopt multi-layer sealing structure design. Metal sealing seat and
PTFE seat can also be selected according to working conditions.
Parts List
| No. | Item | Quantity(piece) | Material |
| 1 | Valve body | 1 | WCB,CF8,CF8M |
| 2 | Valve stem | 1 | 17-4PH, SS304, SS316, SS410 |
| 3 | Valve plate | 1 | WCB,CF8,CF8M |
| 4 | Seal ring | 1 | Stainless steel + graphite,PTFE |
| 5 | Platen ring | 1 | Q235,SS304,SS316 |
| 6 | Hexagon socket bolt | On demand | SS304,SS316 |
| 7 | Open loop | 1 | SS304,SS316 |
| 8 | Pin | 2 | SS304,SS316 |
| 9 | Hex Bolts | 4 | SS304 |
| 10 | Rear gland | 1 | WCB,CF8,CF8M |
| 11 | Washer | 1 | Metal winding mat |
| 12 | Self-lubricating bearing | 1 | Composite material |
| 13 | Self-lubricating bearing | 1 | Composite material |
| 14 | Packing | On demand | PTFE,Flexible graphite |
| 15 | Packing gland | 1 | WCB,CF8,CF8M |
| 16 | Stud | 2 | SS304 |
| 17 | Flat pad | 2 | SS304 |
| 18 | Spring pad | 2 | SS304 |
| 19 | Nut | 2 | SS304 |
Technical Parameters
Nominal diameter (DN):
50,65,80,100,125,150,200,300,350,400,450,500,600,700,800,900,1000,1200.
Nominal pressure (PN): 1.0,1.6,2.5,4.0,6.4(MPa) ANSI,150LB,300LB
Connection form: clip type, flange type, lug type.
Temperature range: soft seal -40℃~160℃, hard seal -40℃~425℃
Leakage: metal seal switch valve according to GB/T 13927 class D
regulations; the control valve according to GB/T 4213 V class
regulations; soft seal zero leakage.
Pressure test: the shell test pressure is 1.5 times the nominal
pressure. The seal test is 1.1 times the nominal pressure. The test
medium is water.
Flow characteristics: Approximate equal percentage characteristics.
The characteristic curve is as follows
Butterfly valve rated Cv value table
| DN | Rated Cv |
| 50 | 95 |
| 65 | 175 |
| 80 | 270 |
| 100 | 470 |
| 125 | 850 |
| 150 | 1400 |
| 200 | 2300 |
| 250 | 3560 |
| 300 | 5800 |
| 350 | 7800 |
| 400 | 10000 |
| 450 | 13500 |
| 500 | 18000 |
| 600 | 25000 |
| 700 | 38500 |
| 800 | 48000 |
| 900 | 52500 |
| 1000 | 61700 |
| 1200 | 81000 |
Actuator configuration
| DN | Valve reference torque(N.m ) | Z series actuator | Fine actuator | Electric | Air pressure |
| (mm) | 1.6 ( MPa) | ZSQ double acting actuator | ZDQ single acting actuator | DA | SR | (Mpa ) |
| 50 | 50 | ZSQ41-φ80-φ14 | ZDQ41-φ100-φ14 | 85 | 100 | 10 | 0.5 ~0.7 |
| 65 | 60 | ZSQ41-φ80-φ14 | ZDQ41-φ125-φ14 | 85 | 115 | 10 |
| 80 | 90 | ZSQ41-φ100-φ16 | ZDQ50-φ125-φ16 | 100 | 125 | 20 |
| 100 | 100 | ZSQ41-φ125-φ20 | ZDQ50-φ125-φ20 | 100 | 140 | 20 |
| 125 | 160 | ZSQ50-φ125-φ20 | ZDQ50-φ160-φ20 | 125 | 140 | 40 |
| 150 | 240 | ZSQ50-φ160-φ25 | ZDQ60-φ200-φ25 | 140 | 190 | 40 |
| 200 | 420 | ZSQ60-φ160-φ30 | ZDQ80-φ200-φ30 | 160 | 210 | 60 |
| 250 | 720 | ZSQ60-φ200-φ35 | ZDQ80-φ250-φ35 | 200 | 240 | 100 |
| 300 | 1100 | ZSQ80-φ250-φ40 | ZDQ100-φ300-φ40 | 240 | 300 | 150 |
| 350 | 1500 | ZSQ80-φ250-φ45 | ZDQ130-φ350-φ45 | 270 | 350 | 200 |
| 400 | 2500 | ZSQ100-φ300-φ50 | ZDQ130-φ400-φ50 | | |
| 450 | 4200 | ZSQ130-φ350-φ50 | ZDQ160-φ400-φ50 | | |
| 500 | 5000 | ZSQ130-φ400-φ55 | ZDQ160-φ450-φ55 | | |
| 600 | 8700 | ZSQ160-φ450-φ70 | | |
| 700 | 10000 | ZSQ160-φ450-φ80 | | |
| 800 | 14750 | ZSQ160-φ500-φ85 | | |
| 900 | 20000 | ZSQ200-φ500-φ95 | | |
Note: ZSQ and ZDQ actuators are developed by our company. For
details, please refer to the Z series actuators. The above valve
actuators are configured with a nominal valve pressure of 1.6MPa at
room temperature. It is recommended to use the actuator air source
pressure of 0.5MPa. If the valve nominal pressure is greater than
1.6MPa, the actuator will be further recommended.
Three-dimensional eccentric principle
1. Deviate from the center of the pipeline.
2. Deviate from the center of the sealing surface.
3. The eccentricity of the tapered cone on the sealing surface.
When the valve is opened, the disc is eccentric (1, eccentric, 2
quickly disengages from the valve seat), which reduces the wear at
the seal, the friction torque is small, and the opening is
flexible.
Eccentric cone. 3. The tangential line of the rotation surface of
the sealing surface of the valve plate forms an angle with the
sealing surface of the valve seat, and the sealing surface of the
valve plate is gradually separated from the sealing surface of the
valve seat and gradually pressed to reduce mechanical wear and
abrasion. Sealing performance and service life are greatly
improved.
