butterfly valve

NAKATA Nakata Electricbutterfly valveNKTD971X-10， Conventional parameters include ductile iron with epoxy resin coating, valve plate made of 304 stainless steel

Valve seat EPDM, clamp connection, equipped with electric actuator.

Butterfly valve is a valve used for throttling in drainage pipelines and other applications. Butterfly valve, abbreviated as butterfly valve, is a type of throttling valve and an important device in the water supply and drainage pipeline system. With the advancement of industrial technology, different requirements have been put forward for the structure and performance of butterfly valves. Therefore, in design and selection, reasonable choices should be made based on the working conditions, including the type, material, and connection form.

NKTD971X-10 DN50

NKT125DA

NKTD-50X

NKTD-25X

NKTD971X-16C DN80

NKTD671X-10 DN250

NKTD671X-10 DN150

NKTQ611F-10U DN40

NKTE-25

NKTH-02

butterfly valveThe structural and performance requirements include:

1. Butterfly valves are mainly composed of valve body, living body, valve shaft, bearings, sealing device, operating mechanism and accessory components.

2. The working principle of butterfly valve is a type of valve that opens and closes by rotating the valve stem and simultaneously driving the disc to rotate.

3. When the butterfly valve is opened, it has a small flow resistance. When opened between approximately 15 °~70 °, sensitive flow control can be achieved.

4. Butterfly valves are suitable for flow regulation. Due to the significant pressure loss of butterfly valves in pipelines, which is about three times that of gate valves, when selecting butterfly valves, the impact of pressure loss on the pipeline system should be fully considered, as well as the strength of the butterfly plate to withstand the pressure of the pipeline medium when closed.

5. The operating characteristics of a butterfly valve are: the valve core of the butterfly valve is disc-shaped, and the valve core rotates around the axis. The size of the rotation angle is equal to the opening of the butterfly valve.

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7. The advantages of butterfly valves are as follows:

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9. Simple structure, small size, light weight, low material consumption, small installation size, fast switch, 90 ° reciprocating rotation, small driving torque.

10. Low fluid resistance and easy operation.

11. Under low pressure, good sealing can be achieved.

12. Good regulation performance.

13. The valve stem is a through stem structure that has undergone quenching and tempering treatment, and has good comprehensive mechanical properties, corrosion resistance, and abrasion resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not move up or down, and the packing of the valve stem is not easily damaged

14. Driving method: The handle type butterfly valve uses a handle rod to directly drive the butterfly plate to achieve opening and closing, with quick opening and closing, but relatively laborious. The turbine butterfly valve drives the butterfly plate through the turbine, and although the switch is slower, it saves effort.

15. In terms of use, handle type butterfly valves are generally used in small-diameter pipelines because the torque of small-diameter valves is smaller, making opening and closing relatively effortless and cost-effective. When the valve stem torque is greater than 300N. M or the butterfly valve diameter is greater than 200MM, worm gear butterfly valves are more suitable for use.