Basic Info.
Model NO.:DQ342H-16C
Driving Mode:Manual
Connection Form:Flange
Structure:Semi Ball and Butterfly Type
Seal Form:Double Direction Metal Sealing
Valve Stem:Normal
Work Pressure:Low Pressure (Pn<1.6mpa)
Working Temperature:Normal Temperature (-40°C<T<120°C)
Material of Seal Surface:Special Hard Metal Sealing
Valve Body:Casting
Application:Industrial Usage, Water Industrial Usage
Trademark:Quanshun
Transport Package:Polywood Case
Specification:DN50 to DN3000
Origin:Zhengzhou China
Product Description
Research Background
Rotating ball valve with double directional sealing is a combination of superior sealing performance of ball valve and advantage of butterfly valve in structure and properties. it not only has the advantage of double directional sealing, long life time of ball valve,but also has the advantage of small size, adjustable.light weight of butterfly valve. It has a eccentric hemisphere valve with butterfly structure. Sealing principle,combined with the front-end sealing of fixed ball valve and forced sealing of eccentric butterfly valve,thereby achieving the bi-directional cutting fluid no matter pressure is high or low. On the two sealing surface of valve,plasma spraying and surfacing process can be used to different hardness to form hard alloy. It can automatically align the center(self-adaption),automatically compensate for wear,automatically put in high hermetical pressure, and there is no friction between the seal when the valve instantly opening and closing.When the valve,the disc projection continuously retracts and goes backwards;when closing the valve,the disc projection continuously swells and moves forward.its advantages of short structure and small volume allow for the possibility that valve with large size can be made. The valve has the features of double direction sealing, convenient installation,reliable operation,which has been a major technology revolution in the valve industry.
Advantages of the bidirectional metal sealing rotary ball valve
-Semi-Ball Valve Structure+Butterfly Valve Face to Face dimension=Rotating Ball Valve
-Double Directional Sealing
-Self Compensating Function
-Scaling Removing
-Most Suitable for Large Diameter
-Light weight
-Flexible opening and closing
-Adjustable features
-Has all performance of semi-ball valve except for straight way
-Has all performance of butterfly valve except for double directional sealing
-Replaceable for any application of butterfly Valve
Double Directional Sealing Diagram
Performance Comparison
| Rotating ball valve | Gate valve | Soft sealing center line butterfly valve | Metal sealing butterfly valve | Eccentric semi-ball valve | Ball Valve |
| 1.Double direction sealing | Double direction sealing | Double direction pressured, sealed by the deformation of rubber | Design with flexure trip ,the valve can seal by double direction.While the sealing will be disabled after long time | Double direction sealing | Floating ball valve can seal in one direction; while fixed type ball valve ,can seal in double direction |
| 2.Both valve disc and seat can made with high hardness sealing face | Both valve disc and seat can made with high hardness sealing face | Either valve disc or seat is rubber material | Either the valve seat or valve disc is flexure trip | Both valve disc and seat can made eith high hardness sealing face | Both ball and seat can made into metal sealing type |
| 3.With self -compensation function after the valve wear out . | For the plate valve ,there are not self -compensation function; wedge valve are designed with that function only | The sealing will be disabled once the rubber wear out | As the valve seat is fixed type without compensation function | With self -compensation function after the valve wear out | With self -compensation function after the valve wear out |
| 4.Can cut off scaling material when it closed | For wedge valve,it can extrude the sundries, but easy to deposit to the bottom of the gate valve | The sealing surface will be destroyed once there are hard material | It can removal the scaling material,but the effect is not so good | Can cut off scaling material when it closed | Without remove scaling function |
| 5.There is no friction between valve seat and disc | For plate valve ,the valve disc and seat is in friction process during the valve moving | It sealed well totally by the friction force | There are little friction force between valve disc and seat during valve opening . | There are almost no friction between valve disc and seat when opening or closing the valve | The valve ball and seat is in friction process when the valve close and open |
| 6.Short dimension, light weight, large size available | Complex structure ;long face to face dimension; height weight; large space | Short design, light weight,large size available | Short design, light weight ,large size available | Long face to face dimension, heavy weight | Long face to face dimension, heavy weight ,complex structure |
| 7.With control performance | With out control function | With control function | With control function | With control performance | Without control performance |
| 8. Lower price (high cost performance | High price | Lower price | Lower price | Higher price | High price |
Main Application
All the valve used in pipe network system, water recovery system, balance tank, sewage system which is easy to be flooded, back flow prevention system should be bi-directional valves. The valve is widely used as on-off and regulating device in pipelines in the fields such as metallurgy , mining, petrochemical, chemical, power, environmental protection, urban construction industries.
1.Water circulating system of large engineering system:(Jinling Petrochemical Corporation of SINOPEC,Huizhou refinery,Wulan group 2.4 million tons urea,Pingdingshan Coal Mining Group 1.2 million tons of vacuum evaporation).
2. Dust removal system and circulating water system of steel plant
3. Sewage treatment system of environment protecting system
4. Water conservancy water pumps and hydro-turbine system
5.Water or air cooling circulation system of thermal
6. Urban district heating system