The introduction of metal elastic sealing butterfly valve and PTFE sealing
Flexible metal seal butterfly valve features and advantages
Flexible metal sealed butterfly valve associated with today's world science and technology high development, using its small size, light weight, flexible operation, easy installation, simple structure, anti-erosion, high temperature resistance and other unique charm attractive style show before the whole world . Metal elastic sealing butterfly valve uses its strict design, beautiful fashion shape, filled with the distinctive flavor of the times that have been subject to favor, its salient features are as follows:
1.full rigidity, reliable sealing: for the elimination of metal sealing butterfly valve deformation sensitivity required to increase body rigidity, the valve uses the minimum thickness corporate design standards is higher than the national standard body, and reasonable-arrange body internal and external reinforcement with full rigidity, thus ensuring the sealing reliability.
2.Open freely, the operating torque reduces significantly, due to the improved three eccentric butterfly plate sealing curves have become more shoen, this will mean more micro-deformation of the valve seat, the actual seat-shaped volume, far less than the metal elastic range. Thus expanse the elastic deformation redundancy of the valve seat, even under high temperature, the materials used can not exceed the elastic range.
In addition, the disc along the pipelines axial displacement has become more trace, which will reduce the stem flow passage along the axis deflection deformation, thus ensuring the stem and sleeve normal contacting precision. Therefore, open freely, operating torque is much smaller than other similar butterfly valve products. This highly innovative design ideas, makes Baofeng a qualitative leap in such comprehensive butterfly valve products quality performance.
3.Using high temperature resistant materials and advanced spray technology, to enable the butterfly valve reaching a wide temperature range, and thus meet the conditions of high temperature and low temperature using requirements
4.The use of high hardness materials and inner parts tend to flow lines exterior design makes the valve erosion resistance and have long life.
PTFE Butterfly Valve features and advantages
The rapid development of materials science, polymer materials in the valve key components application, will extend the use of butterfly valves to a new height, will be used in the valve seat sealing surface and its advantage is particularly prominent. PTFE (polytetrafluoroethylene) has superior chemical stability and unparalleled corrosion resistance and low friction coefficient and other magic characteristics, makes it stand out in many organic polymeric materials like a bright star shining as dazzling strange light splendor. PTFE butterfly valve still uses three eccentric design as basic structure model, in addition to pure PTFE material, also develop other adding chemical new material using PTFE as the basis, so as to achieve the purpose of improving its overall performance, through filling modified materials, its performance that with better intensity, higher temperature resistance, low coefficient of friction, stronger anti-aging performance, longer service life compared with pure PTFE.
| metal flexible seat sealing butterfly valve | PTFE plastic valve seat sealing butterfly valve | ||||||
| the medium pure nature degree requests | higher | Medium temperature sealing performance | good 200~425℃ | the medium pure nature degree requests | commonly | Medium temperature sealing performance | can not be used |
| medium applicable temperature | -40~425℃ | normal temperature gas sealing performance | better | medium applicable temperature | -20~150℃ | normal temperature gas sealing performance | much better |
| normal temperature liquid sealing performance | good | anti-corrosion performance | middle, weak class corrosive media | normal temperature liquid sealing performance | much better | anti-corrosion performance | middle,weak class corrosive media |
Design standards and performance specifications
| implement standard | design and manufacture | GB12238-89、JB8527-T/97、API609 | ||||||||
| flange dimension | GB9113、GB9115-88、HG20592、JB79-59、ANSI.B16.5、DIN2531-2534 JIS.B2212-2215 | |||||||||
| face to face dimension | GB12221-89、ANSI.B16.5、DIN3020、JIS.B2002 | |||||||||
| test and inspection | GB/T13927-89、API598 | |||||||||
| PN | MPa | 1.0 | 1.6 | 2.5 | 4.0 | pound pressure | Class | 150Lb (2 MPa) | 150Lb (2 MPa) | |
| intensity test pressure | MPa | 1.5 | 2.4 | 3.75 | 6.0 | intensity test pressure | MPa | 3 | 7.5 | |
| liquid sealing pressure | MPa | 1.1 | 1.76 | 2.75 | 4.4 | liquid sealing pressure | MPa | 2.2 | 5.5 | |
| gas sealing pressure | MPa | 0.6 | 0.6 | 0.6 | 0.6 | gas sealing pressure | MPa | 0.6 | 0.6 | |
