CHINA BUTTERFLY VALVE MANUFACTURER FACTORY - CHINA INDUSTRIAL BUTTERFLY VALVE FACTORY. ELECTRIC BUTTERFLY VALVE, PNEUMATIC BUTTERFLY VALVE, HYDRAULIC BUTTERFLY VALVE, MANUAL BUTTERFLY VALVE SUPPLIER FROM CHINA

Product name : CHINA BUTTERFLY VALVE MANUFACTURER FACTORY - CHINA INDUSTRIAL BUTTERFLY VALVE FACTORY. ELECTRIC BUTTERFLY VALVE, PNEUMATIC BUTTERFLY VALVE, HYDRAULIC BUTTERFLY VALVE, MANUAL BUTTERFLY VALVE SUPPLIER FROM CHINA

Product No. : 2022526171029

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Details:

structure

It is mainly composed of valve body , valve stem, butterfly plate and sealing ring . The valve body is cylindrical, with a short axial length and a built-in butterfly plate.

Features

1. Butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, rapid switching, 90° reciprocating rotation, small driving torque, etc. It is used to cut off, connect, and adjust the medium in the pipeline. Offers good fluid control properties and shut-off sealing.

2. Butterfly valve can transport mud, with the least amount of liquid accumulated at the pipe mouth. At low pressure, a good seal can be achieved. Good adjustment performance.

3. The streamlined design of the butterfly plate makes the loss of fluid resistance small, which can be described as an energy-saving product.

4. The valve stem is a through-rod structure, which has been quenched and tempered, and has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not move up and down, the packing of the valve stem is not easy to be damaged, and the sealing is reliable. It is fixed with the cone pin of the butterfly plate, and the overhanging end is designed to prevent the valve stem from breaking out when the connection between the valve stem and the butterfly plate is accidentally broken.

5. The connection methods include flange connection, wafer connection, butt welding connection and lug wafer connection.

The drive forms include manual, worm gear drive, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators , which can realize remote control and automatic operation.

advantage

1. The opening and closing is convenient and quick, labor-saving, and the fluid resistance is small, which can be operated frequently.

2. Simple structure, small size, short structure length, small volume and light weight, suitable for large-diameter valves.

3. The mud can be transported, and the liquid accumulation at the pipe mouth is the least.

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

5. Good adjustment performance.

6. When fully open, the effective flow area of the valve seat channel is larger and the fluid resistance is smaller.

7. The opening and closing torque is small, because the discs on both sides of the rotating shaft are basically equally affected by the medium, and the direction of the torque is opposite, so the opening and closing is more labor-saving.

8. The sealing surface material is generally made of rubber and plastic, so the low pressure sealing performance is good.

9. Easy to install.

10. The operation is flexible and labor-saving, and manual, electric, pneumatic and hydraulic methods can be selected.

shortcoming

1. The operating pressure and working temperature range are small.

2. Poor sealing.

Butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure.

According to the sealing form, there are two types of soft sealing type and hard sealing type. The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring.

According to the connection type, it can be divided into flange connection and wafer connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

main classification

According to the driving method

(1) Electric butterfly valve

(2) Pneumatic butterfly valve

(3) Hydraulic butterfly valve

(4) Manual butterfly valve

According to the structure form:

(1) Center sealing butterfly valve

(2) Single eccentric sealing butterfly valve

(3) Double eccentric sealing butterfly valve

(4) Triple eccentric sealing butterfly valve

Sealing surface material:

(1) Soft sealing butterfly valve .

1) The sealing pair is composed of non-metallic soft material to non-metallic soft material.

2) The sealing pair is composed of metal hard material and non-metal soft material.

(2) Metal hard sealing butterfly valve . The sealing pair is composed of metal hard material to metal hard material.

According to the sealing form:

(1) Forced sealing butterfly valve.

1) Elastic sealing butterfly valve: The sealing specific pressure is generated by the valve plate pressing the valve seat when the valve is closed, and the elasticity of the valve seat or valve plate.

2) Applied torque sealing butterfly valve: The sealing specific pressure is generated by the torque applied to the valve shaft.

(2) Pressurized sealing butterfly valve: The sealing specific pressure is generated by the charging of the elastic sealing element on the valve seat or valve plate.

(3) Automatic sealing butterfly valve: The sealing specific pressure is automatically generated by the medium pressure.

According to work pressure:

(1) Vacuum butterfly valve . Butterfly valve whose working pressure is lower than standard stack atmospheric pressure.

(2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.

(3) Medium pressure butterfly valve. Butterfly valve with nominal pressure PN of 2.5--6.4MPa.

(4) High pressure butterfly valve . Butterfly valve with nominal pressure PN of 10.0--80.0MPa.

(5) Ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.

According to working temperature:

(1) High temperature. Butterfly valves for t>450 °C.

(2) Medium temperature butterfly valve. 120 C<t<450 C butterfly valve.

(3) Normal temperature butterfly valve. A butterfly valve with 40C<t<120 °C.

(4) Low temperature butterfly valve. A 100<t<a 40 °C butterfly valve.

(5) Ultra-low temperature butterfly valve. t<-100 °C butterfly valve.

By connection method:

1. Wafer type butterfly valve

The disc of the wafer butterfly valve is installed in the diameter direction of the pipeline. The valve is fully open.

The wafer butterfly valve has a simple structure, small size and light weight. Butterfly valve has two types of sealing: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc.

2. Flanged butterfly valve

The flanged butterfly valve is a vertical plate structure, and the valve stem is the sealing ring of the integral metal hard sealing valve.

It is a composite structure of flexible graphite plate and stainless steel plate, installed on the valve body, and the sealing surface of the butterfly plate is surfacing stainless steel. The sealing ring of the soft sealing valve is made of nitrile rubber and is installed on the butterfly plate.

3. Lug butterfly valve

4. Welded butterfly valve

Welded butterfly valve is a kind of non-sealed butterfly valve, which is widely used in pipelines with medium temperature ≤300℃ and nominal pressure of 0.1Mpa in the production process of building materials, metallurgy, mining, electric power, etc., to connect, open and close or adjust the amount of medium.

Electric regulating butterfly valve is a kind of electric valve and electric regulating valve . The main connection methods are: flange type and wafer type, which are important execution units in the field of industrial automation control . Two main points of installation of electric regulating butterfly valve: the installation position, height, and direction of inlet and outlet must meet the design requirements. Note that the direction of medium flow should be consistent with the direction of the arrow marked on the valve body, and the connection should be firm and tight. Before installation of the electric regulating butterfly valve , a visual inspection must be carried out, and the nameplate of the valve should meet the requirements of the current national standard "General Valve Mark" GB12220. For valves with a working pressure greater than 1.0MPa and a cut-off function on the main pipe, strength and tightness performance tests should be carried out before installation. It can be used after qualified. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage. Electric regulating butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure form; according to the sealing form, it can be divided into soft sealing type and hard sealing type; soft sealing type generally adopts rubber ring seal, hard sealing type Usually a metal ring seal is used.

Functional use

The butterfly valve is usually less than 90° from fully open to fully closed. The butterfly valve and the butterfly stem have no self-locking ability. In order to locate the butterfly plate, a worm gear reducer should be installed on the valve stem . The use of worm gear reducer can not only make the butterfly plate have self-locking ability, so that the butterfly plate can stop at any position, but also improve the operation performance of the valve. The characteristics of industrial-specific butterfly valve: high temperature resistance, high applicable pressure range, large valve nominal diameter, valve body made of carbon steel, valve plate sealing ring using metal ring instead of rubber ring. Large high temperature butterfly valve is made of steel plate welding, mainly used for flue air duct and gas pipeline of high temperature medium. [1]