4104系列气动活塞偏心旋转阀

Packing mat

170

Product

BAIC GROUP

4104 Series Pneumatic Piston Eccentric Rotary Valve

Eccentric rotary valves are also known as cam flex valves. Our company in reference to the

advantages of domestic and foreign eccentric valves and V-shaped ball valves, based on the needs

of users, developed a new type of rotary valve in this year.

Eccentric rotary valve is actually a bow cut-off sphere ball valve. Due to the existence of cam

eccentricity of the valve, so that when the pneumatic device is driving the valve closing parts from

opening to closing , the sealing force acting on the valve seat is gradually increased, so that the

spherical surface of the valve closing parts and the valve seat sealing surface from complete

detachment to contact, and gradually increase its sealing specific pressure until complete sealing,

and vice versa. This greatly improves the sealing condition and sealing effect of normal ball valves,

creates favorable conditions for the use of hard sealing materials (such as various metals and hard

alloys, etc.) on the ball valve, it also opens the way for the use of ball valves at high temperatures and

pressures where wear and tear is critical. In addition, the valve is lightweight due to the use of a bowshape globe and a clamp-type connection, eliminating the need for a pair of flanges. Besides, the

valve has a large flow capacity, which is more than 50% and 20% larger than that of single-seat and

double-seat regulators, respectively.

The valve has good regulating performance and the flow characteristic is modified equal

percentage (between equal percentage and linear). Therefore, eccentric rotary valves have been

used in large numbers as regulators, and secondly, they are also used for solid materials and high

temperature and high pressure for resistance to scouring and abrasion.

Restrainer

Packing bonnet

Packing

Valve stem

Valve core

Valve seat

Clamping ring

Upper bushing

Lower lining ring

Valve body

Eccentric regulating mechanism

Main parts materials

Part Name Material Part Name Material

Valve body

ZG230-450

ZG1Cr18Ni9Ti Valve seat

Reinforced PTFE 1Cr18Ni9Ti buildup welding

Valve shaft 2Cr131Cr18Ni9Ti 17-4PH Holder Stellite alloy ZG230-450

Valve core

ZG230-450

ZG1Cr18Ni9Ti Packing PTFE

Flexible graphite

171

Product

BAIC GROUP

Manufacturing characteristics

1. The packing box adopts the similar structure of ball valve, and the sealing effect is much better than that of

direct stroke valve. The medium flowing through the valve is easily sealed by the packing.

2. The flow path is simple, smooth, small flow resistance, and works in both positive and negative directions.

3. Wide range of service temperature. Valve body and bonnet are cast in one piece. If long-necked bonnet is

used, together with heat dissipation sheet, the service temperature can be -40~450℃ (at this time, the valve

seat is metal-sealed).

4. Large adjustable ratio. The valve core and the seat are completely closed after positioning (Note: When

assembling or repairing the valve core, there should be a certain clearance between the valve core and the

two shafts), and then fixed with the restrainer ring and lock ring. At this time, due to the close contact between

the valve core and the valve seat, the valve stem produces flexural deformation, forcing the valve core to be

tightly pressed on the valve seat. Therefore, the adjustable minimum flow rate is small. Adjustable ratio is R=

100.

5. the valve core in the process of opening or closing, unlike O-shape ball valves, the valve core and the valve

seat are always in close contact, so in the same working conditions require a small actuator torque. It not only

saves energy but also minimizes wear and tear on the valve core and valve seat.

6. Valve core and seat closure produces instant shear effect, can cut off the media fiber, automatically sweep

the solid particles on the valve seat, so the eccentric rotary valve can be used especially in the media

containing fibers, solid particles and not clean.

Specifications and technical parameters

Diameter 25 40 50 65 80 100 125 150 200 250 300

Kv 25 30 58 75 120 190 300 480 930 1200 1900

Nominal pressure PN6.4MPa

Flow characteristics Linear (output can also be changed by positioner to correct to equal percentage)

Temperature ℃ Normal temperature type -20~180; Medium temperature type -40~450

Allowable differential

pressure

6.4 6.4 5.2 6.4 5.4 3.25 2.5 1.5 1.2 1.0 1.0

Leakage amount level Soft seal class VI Hard seal class IV(GB/T4213-2008)

Valve core angle 60°

Air source pressure 0.40~0.6MPa

Optional accessories

1. valve positioner, air filtration decompresser (air source treatment triplet part)

2. Solenoid valve (voltage, whether explosion-proof)

3. Limit switch (transponder), valve position transmitter

4. Holding valve

5. Handwheel

172

Product

BAIC GROUP

Outline dimensions

Flange standard: JB/T79-94, PN6.4MPa, Connection methood: clamping (can

be specially manufactured according to user requirements)

Ordering information

· Material requirements for valve body and valve inner parts

·

· Product name, model

· Nominal diameter, nominal pressure, medium name, medium operating temperature

· Valve action mode: air-to-open or air-to-close

· Actuator type: double-action or single-action (spring reset), domestic or imported,

with or without handwheel

Other matching accessories

Technical parameters are subject to change without notice!