How to troubleshoot butterfly valve?

Pneumatic butterfly valve troubleshooting causes:

The pneumatic butt-clamp butterfly valve is beautiful in appearance and matched with a pneumatic actuator. Valve wrench and valve shaft can be connected without pins, the medium and valve shaft valve body completely isolated, simple and convenient maintenance.

The pneumatic butt-clamp butterfly valve is widely used in food, environmental protection, light industry, petroleum, paper making, chemical industry, electric power, and other industries of the industrial automation system.

The pneumatic butt-clamp butterfly valve is divided into soft seals and hard seals, and each of the two products has different characteristics.

The clamp-on hard seal butterfly valve is a kind of unsealed butterfly valve, widely used in the production process of building materials, metallurgy, mining, electric power, and other media temperature ≤ 300 ℃ nominal pressure of 0.1Mpa pipeline, to connect, open and close or adjust the amount of media.

The structure characteristics of the clamped hard seal butterfly valve.

The butterfly valve is designed and manufactured in a new structural form using a centerline disc and short structural steel plate welding, compact structure, lightweight, easy to install, small flow resistance, large flow capacity, avoids the impact of high-temperature expansion, light operation. There are no connecting rods and bolts in the body, so it works reliably and has a long service life. Can be installed in multiple positions, not affected by the media flow.

 

The design features of the pneumatic wafer butterfly valve include the following.

①The valve body and end cap are made of demerit fine casting.

②The valve stem has an explosion-proof design.

③The standard air supply interface can be directly connected to the solenoid valve.

④The cylinder's inner wall is anodically hardened, with no need for secondary lubrication.

⑤The switch position has a +/-5° stroke adjustment, easy to operate.

⑥It can be installed at any angle of 360°C.

 

The performance specifications of the counterclaim butterfly valve are as follows.

Nominal pressure is 1.0 MPa to 2.5 MPa.

The nominal diameter is DN32~DN600.

Its applicable temperature is -20~+120°C.

These properties of the hard seal butterfly valve will be higher.

A soft seal pneumatic butt-clamp butterfly valve is used in a normal temperature environment.

 

When we encounter the phenomenon that the pneumatic butt butterfly valve does not work, the reasons for this may be many, and the following are the solutions we offer.

The pneumatic pair butterfly valve is mainly composed of a pneumatic actuator and butterfly valve. We install pneumatic accessories according to the user's requirements. The pneumatic accessories of the switching pneumatic butterfly valve are equipped with solenoid valves and limit switches. The adjustable version is equipped with a positioner and a filter reducer.

Therefore, when the pneumatic butterfly valve fails, the cause needs to be checked one by one from each component.

It can be checked from the following aspects.

1. Pneumatic actuator.

①No air source, the air source is not turned on

②Insufficient pressure of air source

③ cylinder piston aging fracture

④Piston gear and rack wear

⑤ single-acting actuator spring rust caused by long-term non-use

2. Valve body.

①Stem twisted or broken

②The medium leakage causes the stem to rust

③ impurities in the medium, resulting in the valve plate and valve seat stuck

3. Solenoid valve

① Loose terminals or fall off, poor energization

②Coil burned out

③ impurities or oil is too little, the solenoid valve is easy to jam

④ Solenoid valve leakage, insufficient pressure of air source.

4. Positioner.

①Gas source is not turned on

②Winter air source icing, air duct, and filter blockage

③ regulator and regulating mesh diaphragm is damaged.

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