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Butterfly valve specification

Author:Site Editor     Publish Time: 2018-12-06      Origin:Site

The butterfly valve application range: its manual contains manual, geared, electric and pneumatic operating butterfly valves with nominal diameters from DN50mm to 1600mm (2"~64") and nominal pressures from PN1.0MPa to 4.0MPa (ANSI CLASS150~300).


Here come the content of the article

  1. how to use butterfly valve?

  2. Butterfly valve layout features

  3. Operation of butterfly valve

  4. Summary of butterfly valve storage, maintenance, equipment and application


How to use butterfly valve?

1. Mainly used to open or close pipeline media and equipment for adjustment, interception and non-reuse.

2. Select the raw material of the valve according to the medium.

A. Carbon steel valves are suitable for water, steam, oil and other media.

B. Stainless steel valves are suitable for corrosive media.

C. Cast iron valves are suitable for water and gas media.

The applicable temperature depends on the material of the seat.

PTFE <130 C

Stainless steel + composite material < 4

Rubber < 60 degree C 

 

Butterfly valve layout features

  1. Basic layout of the butterfly valve.

Higher dust content in the temperature of smelting condition of big condition, the design of the ventilation butterfly valve can be used flat inclined plate structure, the structure of the gaps between the butterfly plate and the valve body, the gap value according to the valve diameter and working condition are used to determine, general control within 0.5% of its channel area, can satisfy the working condition of ventilation butterfly valve installation and changes in temperature and the melting process requirements.

Under the condition of higher temperature and lower dust content, the design of ventilation butterfly valve can adopt the vertical plate structure. The sealing surface of the structure is easy to be processed, and the gap value of the sealing surface is controlled within 0.2% of the channel area. The dimensional precision of valve body and disc sealing pair can meet the design requirements through machining.

2. Packing of the wearing parts

Ventilation butterfly valve body seal according to different working conditions choose different structures, which is conducive to the production and working conditions of the valve. The structure design of shaft end of ventilation butterfly valve adopts the external support structure with excellent heat insulation and sealing effect, which can realize the sealing and then supporting of the valve shaft end, which is easy to adjust, and will not produce the resistance of shaft end. When connecting the direct type or the crank connecting rod mechanism with the transmission mechanism, adding the heat insulation sleeve can keep away from the influence of the high temperature environment on the transmission device effectively, and ensure the normal work of the valve.

 

Operation of butterfly valve

1. The manual operation of the valve uses the handle or gear transmission equipment, electric or pneumatic butterfly valve is driven by electric equipment or pneumatic equipment, so that the disc rotates 90° to open or close the valve.

2. Regarding the manual (including the handwheel of the drive equipment) or the butterfly valve operated by the wrench, in addition to the order contract, when facing the hand wheel or the wrench, the clockwise handwheel or the wrench valve should be closed.

3. The opening and closing indications of the electric and pneumatic butterfly valves are identified by the azimuth indicators on the electric equipment and pneumatic equipment.

 

Summary of butterfly valve storage, maintenance, equipment and application

1. The valve should be stored in a boring, ventilated room, and the valve passage should be blocked at both ends.

2. Long-term registered valves should be regularly viewed to remove dirt. Special attention should be paid to the cleaning of the sealing surface and the damage of the sealing surface.

3. Before the equipment, carefully check whether the valve symbol is consistent with the application requirements.

4. Check the valve passage and sealing surface before the equipment. If there is dust, it should be cleaned with a cleaning cloth.

5. Check whether the packing is tight before the equipment, and ensure the sealing of the packing. It should not hinder the rolling of the valve stem.

6. The tightening force of tightening the connecting bolts should be even and appropriate.

7. The butterfly valve can be placed on the horizontal and straight pipelines of the equipment. The orientation of the equipment should be guaranteed to be repaired and replaced.

8. When the manual valve is open or closed, the handle should be opened and closed, and the auxiliary lever or other tools should not be borrowed.

9. The valve should be used regularly to check whether the sealing surface is worn or not. If the damage fails, it should be repaired or replaced in time.

 

Ningde Hanna Company adopts the latest technology at home and abroad to produce butterfly valves of various specifications. The butterfly valve of our company has compact structure, flexible rotation, reliable sealing and long service life. In order to adapt to the operation conditions of different customers, the main materials of valves are cast iron, carbon steel, nodular iron, alloy steel, stainless steel, copper and so on. The driving modes are manual, electric, pneumatic, hydraulic and so on. We sincerely look forward to your arrival!

butterfly valve


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