Flange butterfly valve lever

Lever type butterfly valve with small structure, light weight, four bar linkage driven disc in the valve opening and closing of the moment there is a close translation process, no friction, can ensure the sealing performance of valve. Lever type butterfly valve is suitable for metallurgy, chemical industry, building materials, plant and other air or other gas venting and environment protection of the pipe, a gas medium flow adjusting or cutting device, can be used with all kinds of form a complete set of actuators.

application

Butterfly valve is a kind of simple structure of the regulator, at the same time can also be used for low pressure pipeline medium switch control.

Ventilation butterfly valve is a kind of closed type butterfly valve. ‍

Ventilation butterfly valve used in chemical industry, building materials, ventilation, environmental protection engineering in power plant, glass and other industries of dust in the cold or hot gas pipeline, the gas medium to adjust flow or cut off the pipeline control unit. This valve shall generally be installed in the pipeline.

‍ structure characteristics

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

2. No the connecting rod, bolts, etc., reliable operation, long service life. Can be installed in a transfer, not affected by the medium flow direction

use

Ventilation butterfly valve is a kind of closed type butterfly valve, widely used in building materials, metallurgy, mining, power and other production process of medium temperature 300 ℃ or less on the pipe nominal pressure of 0.1 Mpa, to connect and open/close or adjusting medium quality.

The working principle of

Ventilation butterfly valve actuator driven by a motor to drive, make the disc plate freely within the range of 90 ° rotation to achieve the goal of open/close or adjusting medium flow. At present, fluorine-butterfly butterfly valve, as a kind of used to implement the line with rubber butterfly valve on-off and flow control components, piping system has been in the petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve technology has been known, its seal form with seal structure, sealing materials for rubber, ptfe, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Existing a more advanced butterfly valve is a triple eccentric metal hard seal butterfly valve, the valve body and seat for the Siamese components, valve seat sealing surface layer welding temperature resistant, corrosion resistant alloy material. Multilayer soft fold type sealing ring is fixed on the valve plate, the butterfly valve and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the butterfly valve sealing performance and prolong the service life of the advantages.

Ventilation butterfly valve installation points

1. The installation position, height, import and export direction must comply with the design requirements, pay attention to the medium flow direction should be consistent with the body the direction of the arrow, the connection should be firmly connected. 2. A visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards "universal signal valve" GB 12220. For the working pressure is greater than 1.0 MPa and valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Leak test, the test pressure is 1.1 times the nominal pressure; The duration of the test meet the requirements of GB 50243.

application

Butterfly valve is a kind of simple structure of the regulator, at the same time can also be used for low pressure pipeline medium switch control.

Ventilation butterfly valve is a kind of closed type butterfly valve. ‍ [1]

Ventilation butterfly valve used in chemical industry, building materials, ventilation, environmental protection engineering in power plant, glass and other industries of dust in the cold or hot gas pipeline, the gas medium to adjust flow or cut off the pipeline control unit. This valve shall generally be installed in the pipeline.

‍ structure characteristics

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

2. No the connecting rod, bolts, etc., reliable operation, long service life. Can be installed in a transfer, not affected by the medium flow direction

use

Ventilation butterfly valve is a kind of closed type butterfly valve, widely used in building materials, metallurgy, mining, power and other production process of medium temperature 300 ℃ or less on the pipe nominal pressure of 0.1 Mpa, to connect and open/close or adjusting medium quality.

The working principle of

Ventilation butterfly valve actuator driven by a motor to drive, make the disc plate freely within the range of 90 ° rotation to achieve the goal of open/close or adjusting medium flow.

At present, fluorine-butterfly butterfly valve, as a kind of used to implement the line with rubber butterfly valve on-off and flow control components, piping system has been in the petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve technology has been known, its seal form with seal structure, sealing materials for rubber, ptfe, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Existing a more advanced butterfly valve is a triple eccentric metal hard seal butterfly valve, the valve body and seat for the Siamese components, valve seat sealing surface layer welding temperature resistant, corrosion resistant alloy material. Multilayer soft fold type sealing ring is fixed on the valve plate, the butterfly valve and the traditional butterfly valve compared with high temperature resistant, convenient operation, opening and closing without friction, closed as the actuator torque increases to compensate for sealing, improve the butterfly valve sealing performance and prolong the service life of the advantages.

Ventilation butterfly valve installation points

1. The installation position, height, import and export direction must comply with the design requirements, pay attention to the medium flow direction should be consistent with the body the direction of the arrow, the connection should be firmly connected.

2. A visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards "universal signal valve" GB 12220. For the working pressure is greater than 1.0 MPa and valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Leak test, the test pressure is 1.1 times the nominal pressure; The duration of the test meet the requirements of GB 50243.

Hard seal knowledge:

Using the problems

One, due to multi-layer soft fold type sealing ring fixed in the valve plate, when the valve plate normally open state media on the sealing surface to form positive scour, soft sealing strip of metal sandwich after flushing, directly affect the sealing performance.

Second, restricted by structure condition of the structure does not adapt to do below path DN200 valves, because the valve plate structure is too thick, large flow resistance.

Third, because of the principle of triple eccentric structure, between the sealing surface of valve plate and valve seat sealing is to rely on the drive torque valve plate pressure to the valve seat. Is flow state, the higher the medium pressure seal compression tight. When the countercurrent flow medium with the increase of medium pressure valve plate and valve seat unit is less than the pressure medium, the positive pressure between seal began to leak.

High performance three partial hardness sealing butterfly valve,

It has the following characteristics: the seat sealing by soft t-shaped sealing ring on both sides of the multi-layer pieces of stainless steel.

Valve plate and valve seat sealing surface for the oblique cone structure, the valve plate oblique cone surface welding heat resistance, corrosion resistant alloy material; Fixed between the adjusting ring clamp spring together with the clamp on adjusting bolt assembly structure. This structure can effectively compensate the tolerance zone between sleeve and body and the elastic deformation of the stem under medium pressure, solve the valves in the process of the two-way exchange medium conveying the sealing problems.

Soft T on both sides of the multi-layer stainless steel pieces of sealing ring, with metal sealing and soft sealing the dual advantages of under low temperature and high temperature circumstances, all with zero leakage sealing performance. Trials show that pool is flow state (medium flow direction is same as the rotation direction of the butterfly plate), the sealing surface pressure is the drive torque and the medium pressure in the valve plate. Positive medium pressure valve plate oblique cone surface and valve seat sealing surface squeezed more tightly, sealing effect is better.

When the current state, between the valve plate and valve seat sealing pressure on drive torque make the valve plate to the seat. As the reverse medium pressure increases, the unit is pressure between the valve plate and valve seat is less than the pressure of medium, the adjusting ring after the loading of the spring deformation energy stored by compensating valve plate and valve seat sealing surface of the tight pressure automatic compensation effect.

So the utility model is not like the existing technology, soft hard multi-layer sealing ring, installed in the valve plate directly installed on the valve body, in the middle of the plate and seat add adjustable ring is the ideal way of two-way hard seal. It will replace gate, and the spherical valve

Structural characteristics of

Three unique to the eccentricity of the design between the sealing surface friction drive, prolong the service life of the valve.

Generated by the torque elastic seal.

Clever wedge design allows for automatic sealing valve has closed more and more tightly, compensatory, zero leakage between the sealing surface.

Small volume, light weight, light operation and ease of installation.

According to user requirements with pneumatic, electric devices, meet the needs of the remote control and programmed control.

Replacement parts material can be applied to all kinds of medium and the lining can be anti-corrosion.

Successive structure diversification, the clamp, flange, butt welding.

The difference between hard seal butterfly valve and soft sealing butterfly valve

Hard seal butterfly valve, both sides of the sealing pair are metal materials or other hard materials are called "hard seal". This kind of seal sealing performance is poor, but high temperature resistance, wear resistance, good mechanical properties. Such as: steel + steel; Steel + copper; Steel + graphite; Steel + alloy steel; (where the steel may also be cast iron, cast steel, alloy steel can also be surfacing welding, spraying alloy).

Soft sealing butterfly valve, both sides of the seal side is the metal material, on the other side is elastic non-metallic materials are referred to as "soft seal". This kind of seal sealing performance is good, but not high temperature resistant, easy to wear and poor machinery. Such as: steel + rubber; Steel + [wiki] four fluorine polyethylene [/ wiki]; Such as rotor pump.

The advantage of soft sealing butterfly valve is sealed performance is good, defect is easy ageing, wear and short service life.

Hard seal butterfly valves service life is long, but the sealing is relatively worse than soft seal