Pneumatic temperature damper

Ventilation butterfly valve used in chemical industry, building materials, power plant, glass and other industries in ventilation, environmental protection engineering dust cold or hot air in the gas pipeline, as the gas medium flow adjustment or cut off the pipeline control device. The valve should be installed in the pipeline in the general level of.

Introduction

Butterfly valve is a valve with a simple structure, but also can be used for low pressure pipelinemedium control switch.

Electric butterfly

Ventilation butterfly valve is a kind of non sealed butterfly valve.

Ventilation butterfly valve used in chemical industry, building materials, power plant, glass and other industries in ventilation, environmental protection engineering dust cold or hot air in the gas pipeline, as the gas medium flow adjustment or cut off the pipeline control device. The valve should be installed in the pipeline in the general level of.

The main products: large ventilation butterfly valve, electric butterfly, leakage rate of 0, explosion-proof ventilation butterfly valve.

Structure characteristics

1 using the short middle type plate and structural steel welding structure design and manufacture of new, compact structure, light weight, convenient installation, small flow resistance, big circulation,avoid the influence of high temperature expansion, easy operation.

2 no connecting rod, bolts, reliable work, long service life. To multi station installation, not affected by the medium flow

Use

Ventilation butterfly valve is a kind of non sealed butterfly valve, widely used in building material,metallurgy, mine, electric power production process of medium temperature are less than 300 of nominal pressure for 0.1Mpa pipeline, is used to connect the opening and closing, or adjust the medium quality.

Ventilation butterfly valve

The 2 Principle

Ventilation butterfly valve is divided into manual and electric transmission, by the motor or turbinedrive executive mechanism, make the dish plate free rotation to achieve open and close or adjust medium flow aims at 90 degrees.

3 key points of installation

1 the installation location, height, must meet the design requirements of the import and export orientation, note the direction of media flow valve should be marked by the arrow direction, the connection should be firmly.

2 the valve must be installed prior to visual inspection, the valve plate should be consistent with theprovisions of GB 12220 existing national standards, "universal valve logo". The working pressuregreater than 1 MPa and in the main pipe on the role played off valve, the installation should be carried out before the performance test the strength and tight, pass behind the prospective use.Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5min,the valve housing, packing should be no leakage for qualified. Tightness test, the test pressure is 1.1 times the nominal pressure; test duration consistent with the requirements of GB 50243.

4 Classification

According to the drive

(1) the electric butterfly valve

(2) pneumatic butterfly valve

(3) hydraulic butterfly valve

(4) the electric hydraulic butterfly valve

According to the structure

(1) Centre for butterfly valve

(2) a single eccentric butterfly valve seal

(3) double eccentric butterfly valve seal

(4) the three eccentric butterfly valve seal

According to material

(1) a soft seal butterfly valve

A. sealing by the non-metal soft material on the non-metal soft material.

B. by metal hard seal material on the non-metal soft material.

(2) metal hard seal butterfly valve. By metal hard seal material on the metal hard material.

By sealing the form

(1) mandatory sealing butterfly valve

A. elastic sealing butterfly valve. Seal than the pressure valve closed by the valve plate extrusionvalve seat, the valve seat or valve plate production flexibility

B. plus torque seal butterfly valve. Seal than the pressure generated by the torque applied to thevalve shaft

(2) the pressurized seal butterfly valve. Sealing pressure than the pressure generated by the valve seat or valve plate on the elastic seal member charge

(3) automatic sealing butterfly valve. Seal than the pressure from the media pressure generated automatically.

According to the working pressure

(1) vacuum butterfly valve. The working pressure is lower than the standard heap atmosphere calendar butterfly valve.

(2) low pressure valve. Butterfly valve nominal pressure PN<1.6MPa.

(3) the pressure valve. Nominal pressure PN 2.5--6.4MPa butterfly valve.

(4) high pressure butterfly valve. Nominal pressure PN is 10. 0--80.0MPa butterfly valve.

(5) high pressure valve. Butterfly valve nominal pressure PN>100MPa.

According to the working temperature

(1) high temperature butterfly valve. Butterfly valve of t>450 DEG C

(2) the temperature in the butterfly valve. Butterfly valve 120 C<t<450 C

(3) the normal temperature butterfly valve. A butterfly valve 120 C 40C<t<;

(4) low temperature valve. Butterfly valve of a 100<t< 40 C

(5) the ultra low temperature valve. Butterfly valve of a 100 C t<

According to connection

(1) on the folder type butterfly valve

(2) flange butterfly valve

(3) lug type butterfly valve

(4) welding type butterfly valve

5 characteristics

1, convenient opening and closing rapidly, fluid resistance is labor saving, small, you can always operate.

2, has the advantages of simple structure, small volume, light weight.

3, to transport slurry, accumulation of fluid in the pipe mouth at least.

4, low pressure, can achieve a good seal.

5, good adjustment performance.

6 standards and parameters

Standard

1, design standards: GB/T12238-1989 JB/T8692-1998

2, the flange connection size: GB/T9115.1-2000

3, the length of the structure h:GB/T12221-1989

4, pressure test: GB/T13927-1992; JB/T9092-1999

Parameters

Nominal diameter of DN (mm) 50 ~ 2000

Nominal pressure PN (Mpa) 0.05 0.25 0.6

Strength test pressure test of 0.075 0.375 0.9

Leakage of sealing test is less than or equal to 1.5%

Applicable medium gas, dust containing gas, flue gas etc.

Application of negative temperature -10 degrees, and 250 degrees above zero