The Connection Design of Forged Steel Gate Valves
Jul 15, 2017
The forged steel gate valve is one kind of gate valves. Gate valves can be classified into forged steel gate valves, cast iron gate valves, ductile cast iron gate valves, stainless steel gate valves, etc. according to their materials.
The disc of forged steel gate valve is the gate. The gate's direction of movement is perpendicular to the direction of the fluid. Forged steel gate valves can only be fully opened and closed, and can not be used for regulation and throttling. The gate of the forged steel gate valve has two sealing surfaces. The wedge or wedge angle of the most commonly used sealing surfaces change with valve parameters. The drive modes of forged steel gate valves include manual, pneumatic, electric and gas over oil drives. Forged steel gate valves can be used in a wide range. Generally, they are used for the shut-off devices with DN50 and below DN50, and are the relatively common valves.
The forms and advantages of the connection design of forged steel gate valves
Forged steel gate valves can be applied to different media, such as water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media. They have three kinds of valve bodies' bonnets connection. The followings are the forms and advantages of the connection design.
The advantage of forged steel gate valves with bolted connections is convenient for maintenance. The valve body and the bonnet are were connected by the bolt. It is sealed by the spiral wound gasket.
If the forged steel gate valves are with the welded connection, the valve body and the bonnet are sealed by full welding, which has the advantage of without the risk of external leakage.
Forged steel gate valves with valve bodies and bonnets connected by threaded connections and self sealed by the internal pressure are called forged steel gate valves with pressure seal bonnets. They feature in that the greater their internal pressure is, the better their sealing performance will be.
The application scopes of forged steel gate valve
Forged steel gate valves can be widely used as cut-off devices in different pipelines of tap water, sewage, construction, petroleum, chemical, food, pharmaceutical, textile, electric power, shipbuilding, metallurgy, energy system, etc.
The working environment of forged steel gate valves
Forged steel gate valves can be applied for cutting off or connecting the media in the pipelines with small diameters, whose pressure is between Class 150 and Class 2500, working temperature is between -29℃and 425℃ (for carbon steel pipes) or between -29℃ and 500℃ (for stainless steel pipes). They are especially widely used for petroleum pipelines.
The operating principle of forged steel gate valves
When the forged steel gate valve is closed, the sealing surface can only be sealed by the pressure of media, which pushes the sealing surface of the gate to the other side of the valve seat to ensure the sealing performance. This is self-sealing. Most valves adopt the forced seal structure. When the valve is closed, it needs external pressure to force the gate to press on the valve seat so that the sealing performance of the sealing surface can be ensured.
The gate valve with the gate moves with the valve stem in linear motion can be also called the rising stem gate valve.
When the gate valve is opened, the flow channel of the fluid is completely smooth if the lifting height of the gate equals the diameter of the valve, but the location of the gate can not be monitored when the valve is in operation.
In practice, the top end of the valve stem is the sign of the gate vale's full-opened position or when the valve can not be rotated in the clockwise direction any more, it means that the valve is fully opened. In order to avert the occurrence of the deadlock resulted from the temperature variation, usually when the gate is raised to the top of the valve stem, we will rotate the valve in the anticlockwise direction half a circle to a circle, which is considered that the valve is fully opened. Thus, the fully opened position of the valve should depend on the position or the stroke distance of the gate.
The disc of forged steel gate valve is the gate. The gate's direction of movement is perpendicular to the direction of the fluid. Forged steel gate valves can only be fully opened and closed, and can not be used for regulation and throttling. The gate of the forged steel gate valve has two sealing surfaces. The wedge or wedge angle of the most commonly used sealing surfaces change with valve parameters. The drive modes of forged steel gate valves include manual, pneumatic, electric and gas over oil drives. Forged steel gate valves can be used in a wide range. Generally, they are used for the shut-off devices with DN50 and below DN50, and are the relatively common valves.
The forms and advantages of the connection design of forged steel gate valves
Forged steel gate valves can be applied to different media, such as water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media. They have three kinds of valve bodies' bonnets connection. The followings are the forms and advantages of the connection design.
The advantage of forged steel gate valves with bolted connections is convenient for maintenance. The valve body and the bonnet are were connected by the bolt. It is sealed by the spiral wound gasket.
If the forged steel gate valves are with the welded connection, the valve body and the bonnet are sealed by full welding, which has the advantage of without the risk of external leakage.
Forged steel gate valves with valve bodies and bonnets connected by threaded connections and self sealed by the internal pressure are called forged steel gate valves with pressure seal bonnets. They feature in that the greater their internal pressure is, the better their sealing performance will be.
The application scopes of forged steel gate valve
Forged steel gate valves can be widely used as cut-off devices in different pipelines of tap water, sewage, construction, petroleum, chemical, food, pharmaceutical, textile, electric power, shipbuilding, metallurgy, energy system, etc.
The working environment of forged steel gate valves
Forged steel gate valves can be applied for cutting off or connecting the media in the pipelines with small diameters, whose pressure is between Class 150 and Class 2500, working temperature is between -29℃and 425℃ (for carbon steel pipes) or between -29℃ and 500℃ (for stainless steel pipes). They are especially widely used for petroleum pipelines.
The operating principle of forged steel gate valves
When the forged steel gate valve is closed, the sealing surface can only be sealed by the pressure of media, which pushes the sealing surface of the gate to the other side of the valve seat to ensure the sealing performance. This is self-sealing. Most valves adopt the forced seal structure. When the valve is closed, it needs external pressure to force the gate to press on the valve seat so that the sealing performance of the sealing surface can be ensured.
The gate valve with the gate moves with the valve stem in linear motion can be also called the rising stem gate valve.
When the gate valve is opened, the flow channel of the fluid is completely smooth if the lifting height of the gate equals the diameter of the valve, but the location of the gate can not be monitored when the valve is in operation.
In practice, the top end of the valve stem is the sign of the gate vale's full-opened position or when the valve can not be rotated in the clockwise direction any more, it means that the valve is fully opened. In order to avert the occurrence of the deadlock resulted from the temperature variation, usually when the gate is raised to the top of the valve stem, we will rotate the valve in the anticlockwise direction half a circle to a circle, which is considered that the valve is fully opened. Thus, the fully opened position of the valve should depend on the position or the stroke distance of the gate.
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