D643H pneumatic multi-level hard seal flange butterfly valve series products, a long life, energy-saving butterfly valve. Its structure adopts three-dimensional centering principle design, the valve seat adopts hard and soft sealing compatible multi-level structure, exquisite processing, advanced technology. This product is composed of valve body, butterfly plate, multi-level valve seat, valve stem, transmission mechanism and other main components. Therefore, it is widely used in metallurgy, electric power, petroleum, chemical, air, gas, combustible gas and water supply and drainage of corrosive medium pipelines.

Because the butterfly valve of this product is a three-dimensional eccentric principle design, so that the space movement trajectory of the sealing surface to achieve the ideal, the sealing surface between each other without friction, no interference, and the sealing material is properly selected, so that the butterfly valve sealing, corrosion resistance, high temperature resistance and wear resistance are reliably guaranteed. Its main features are as follows:

1, the opening moment is small, flexible and convenient, labor-saving and energy-saving.

2, three-dimensional centering structure, so that the butterfly plate is closed more tightly, its sealing performance is reliable, to achieve no leakage.

3, high pressure resistance, corrosion resistance, wear resistance, long service life, etc.

Design criteria: GB / T 12238; JB / T 8527

Flange connection size

GB/T 9113.1；GB/T 9113.2

GB/T 9115.1；GB/T 9115.2

Structure Length

GB/T 12221

Pressure Test

GB/T 13927;JB/T 9092

 Adopt new series GT pneumatic actuator, with dual action and single action (spring reset), gear drive, safe and reliable; large diameter valve adopts series AW pneumatic actuator pull fork drive, reasonable structure, high output torque, dual action and single action type.

1, gear type double piston, large output torque, small volume.

2, the cylinder selection of aluminum-gold material, light weight, beautiful appearance.

3. The manual operation mechanism can be installed at the top and bottom.

4. The rack-type connection can adjust the opening Angle and the rated flow rate.

5. The actuator can choose the charged signal feedback indication and various accessories to realize the automatic operation.

6. IS05211 standard connection provides convenience for the installation and replacement of products.

7. The joint screws adjusted at both ends enable the standard product to have a ± 4° adjustable range at 0° and 90°. Ensure the accuracy of the synchronization with the valve.

appendix

 The following accessories can be selected according to the different controls and requirements:

 Cut-off accessories: single electric solenoid valve, double electric solenoid valve, limit switch return device.

 Adjusting accessories: electrical positioner, pneumatic positioner, electrical converter.

Air source treatment accessories: air filter pressure reducing valve, air source treatment triples.

Manual mechanism: HVSD hand operating mechanism

Three eccentric characteristics and principles

1. Deviation from the pipe center

2. Deviation from the center of the sealing surface

3. A tilted, cone-shaped shape

When the valve is opened, the butterfly plate and the valve seat contact instantly when they are closed. The eccentric 1 and eccentric 2 of the butterfly plate are used to quickly escape from the valve seat, reducing the wear of the sealing pair, the friction moment is small, and the opening is flexible. Eccentric cone 3 to allow the butterfly plate to contact seal through the seat hole when the valve is opened or closed. In addition, the rotating radius of the tapered butterfly plate is greater than the rotating radius of the sealed secondary contact position, so the butterfly plate will be tighter and tighter when the valve is closed, which can realize self-locking and prevent the butterfly plate from overpositioning.

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