Double Block and Bleed Plug Valve
Applications
Double block and bleed plug valve is applicable as an Ideal device for cutting off media in pipelines of aviation Kerosene,crude oil,light oil natural gases, iquefied petroleum Gases,pipeline coal gases,chemical media, etc
Characteristics
1.In the valve's opening/closing process,there is no contact betweenthe sealing surfaces of the valve body and the vane,so the sealingsurfaces suffer neither friction nor wear,contributing to the valve's
long service life and small opening/closing torque;
2.For the valve's maintenance,there is no need to remove the valvefrom the pipeline but just remove its bottom cover to replace the
vane pair,thus very easy for the maintenance;
3. The valve's body and plug are full-bore so that the medium canflow through the valve without any flow resistance,and it's alsopossible to clean the pipeline to overcome the shortcomings of the
reduced bore valve
4. The valve's cavity is plated with hard chrome and the sealing
area is hard and smooth;
5.The elastic seal on the vane is made of the fluorine rubber andmolded and for medina groove of the vane surface.The fireproof metal-to-metal seal is used as the backing of the elastic seal;
6.The valve is provided with an automatic bleed device(optional)which can prevent the abnormal pressure rise of the valve cavityand check the valve's effect after the valve is completely closed;7. The valve's opening/closing indicator is insync with the opening/closing position and can accurately display the valve's opening'closing status.
Description of specifications
The valve is designed and manufactured asperAPl6D
The flange connection size isas per ANSl B16.5,JB79,HG20592and GB/T9113:
The valve's structural length is as per ANSI B 16. 10,
GB12221-89andJB/T 5298;
The valve is checked and tested asperAPI598andAPI6D
Working Principle
The action of two sealing vanes mounted on the cock is the key to the working principle of the double block and bleed valve.
Close the valve
To close the valve,first rotate the handwheel to rotate the cock andthe sealing vanes by 90o ; then the cock will move downw ards;the moving cock drives the sealing vanes to the sealing surfaces of the valve cavity until the elastic gasket ring is uniformly pressed tothe upper and lower ends of the valve bore to achieve sealing.
Open the valve
To close the valve, first rotate the handwheel to rotate the cock and the sealing vanes by 90 ; then the cock will move downwards;the moving cock drives the sealing vanes to the sealing surfaces of the valve cavity until the elastic gasket ring is uniformly pressed to the upper and lower ends of the valve bore to achieve sealing.
About sealing
The elastic gasket ring is molded and formed in the groove of thevanes, and as the sealing vanes move to the valve's inlet and outletthe gasket ring is also gradually pressed into the groove.The machined vane surface foms a secondary metal-to-metal seal withthe valve cavity which can prevent the elastic gasket ring from being further pressed and also have a fireproof function.
Double block and bleed valve
This is away to achieve complete containment of both ends of the pipeline with two block valves and one bleed valve in between.When the two main valves are closed, closing/opening the bleed valve can improve the system's safety.If the first valve leaks,the leaked medium can be led out by the opened bleed valve.
Double sealing mode
The two separate sealing vanes are compressed on upper and lowerends of the valve bore(double block),and when the valve is closed the bleed valve will be opened to check the sealing effect(bleed).
Double block and bleed plug valve is applicable as an Ideal device for cutting off media in pipelines of aviation Kerosene,crude oil,light oil natural gases, iquefied petroleum Gases,pipeline coal gases,chemical media, etc
Characteristics
1.In the valve's opening/closing process,there is no contact betweenthe sealing surfaces of the valve body and the vane,so the sealingsurfaces suffer neither friction nor wear,contributing to the valve's
long service life and small opening/closing torque;
2.For the valve's maintenance,there is no need to remove the valvefrom the pipeline but just remove its bottom cover to replace the
vane pair,thus very easy for the maintenance;
3. The valve's body and plug are full-bore so that the medium canflow through the valve without any flow resistance,and it's alsopossible to clean the pipeline to overcome the shortcomings of the
reduced bore valve
4. The valve's cavity is plated with hard chrome and the sealing
area is hard and smooth;
5.The elastic seal on the vane is made of the fluorine rubber andmolded and for medina groove of the vane surface.The fireproof metal-to-metal seal is used as the backing of the elastic seal;
6.The valve is provided with an automatic bleed device(optional)which can prevent the abnormal pressure rise of the valve cavityand check the valve's effect after the valve is completely closed;7. The valve's opening/closing indicator is insync with the opening/closing position and can accurately display the valve's opening'closing status.
Description of specifications
The valve is designed and manufactured asperAPl6D
The flange connection size isas per ANSl B16.5,JB79,HG20592and GB/T9113:
The valve's structural length is as per ANSI B 16. 10,
GB12221-89andJB/T 5298;
The valve is checked and tested asperAPI598andAPI6D
Working Principle
The action of two sealing vanes mounted on the cock is the key to the working principle of the double block and bleed valve.
Close the valve
To close the valve,first rotate the handwheel to rotate the cock andthe sealing vanes by 90o ; then the cock will move downw ards;the moving cock drives the sealing vanes to the sealing surfaces of the valve cavity until the elastic gasket ring is uniformly pressed tothe upper and lower ends of the valve bore to achieve sealing.
Open the valve
To close the valve, first rotate the handwheel to rotate the cock and the sealing vanes by 90 ; then the cock will move downwards;the moving cock drives the sealing vanes to the sealing surfaces of the valve cavity until the elastic gasket ring is uniformly pressed to the upper and lower ends of the valve bore to achieve sealing.
About sealing
The elastic gasket ring is molded and formed in the groove of thevanes, and as the sealing vanes move to the valve's inlet and outletthe gasket ring is also gradually pressed into the groove.The machined vane surface foms a secondary metal-to-metal seal withthe valve cavity which can prevent the elastic gasket ring from being further pressed and also have a fireproof function.
Double block and bleed valve
This is away to achieve complete containment of both ends of the pipeline with two block valves and one bleed valve in between.When the two main valves are closed, closing/opening the bleed valve can improve the system's safety.If the first valve leaks,the leaked medium can be led out by the opened bleed valve.
Double sealing mode
The two separate sealing vanes are compressed on upper and lowerends of the valve bore(double block),and when the valve is closed the bleed valve will be opened to check the sealing effect(bleed).
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