General Valve(Full Bore)
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 and thesealing 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.
Open the valve
To open the valve,first rotate the handwheel to lift the cock to pullbackthe sealing vanes from the sealing surfaces on both sides of the valve body.When the vanes are completely withdrawn and disengaged from the sealing surfaces of the valve body,continue to rotate the handwheel so as to make the cock and the sealing vanes rotate by 90?, and the valve will be on the open position.
About sealing
The elastic gasket ring is molded and formed in the groove of the vanes,and as the sealing vanes move to the valve'sin let and outlet, the gasket ring is also gradually pressed into the groove. The machined vane surface forms a secondary metal-to-metal seal with the 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 pipe- line 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).
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 and thesealing 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.
Open the valve
To open the valve,first rotate the handwheel to lift the cock to pullbackthe sealing vanes from the sealing surfaces on both sides of the valve body.When the vanes are completely withdrawn and disengaged from the sealing surfaces of the valve body,continue to rotate the handwheel so as to make the cock and the sealing vanes rotate by 90?, and the valve will be on the open position.
About sealing
The elastic gasket ring is molded and formed in the groove of the vanes,and as the sealing vanes move to the valve'sin let and outlet, the gasket ring is also gradually pressed into the groove. The machined vane surface forms a secondary metal-to-metal seal with the 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 pipe- line 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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