1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe section.
2. Simple structure, small volume and light weight.
3. It is tight and reliable. At present, the sealing surface material of gate valve is widely used in plastic, with good sealing performance, and also widely used in vacuum system.
4. It is easy to operate and fast to open and close. It only needs to rotate 90 ° from full open to full close, which is convenient for remote control.
5. The maintenance is convenient, the gate valve structure is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.
6. When the valve is fully open or closed, the sealing surface of the ball and the valve seat shall be isolated from the medium. When the medium passes through, the corrosion of the valve sealing surface will not be caused.
7. It has a wide range of applications, ranging from small diameter to several millimeters and large diameter to several meters, from high vacuum to high pressure.
Carbon steel globe valves have the following advantages
1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe section.
2. Simple structure, small volume and light weight.
3. It is tight and reliable. At present, the sealing surface material of gate valve is widely used in plastic, with good sealing performance, and also widely used in vacuum system.
4. It is easy to operate and fast to open and close. It only needs to rotate 90 ° from full open to full close, which is convenient for remote control.
5. The maintenance is convenient, the gate valve structure is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.
6. When the valve is fully open or closed, the sealing surface of the ball and the valve seat shall be isolated from the medium. When the medium passes through, the corrosion of the valve sealing surface will not be caused.
7. It has a wide range of applications, ranging from small diameter to several millimeters and large diameter to several meters, from high vacuum to high pressure.
Carbon steel stop valve can be divided into straight through type, three-way type and right angle type according to its channel position. The latter two types of gate valves are used to distribute media and change the flow direction of media.
Installation and maintenance should pay attention to the following editing
1. The rotating position of valve handle shall be reserved.
2. It cannot be used as throttling.
3. Ball valve with driving mechanism shall be installed vertically.
Carbon steel globe valve, American Standard globe valve and American standard gate valve work by rotating the valve to make the valve unblocked or blocked. The gate valve switch is light, small in size, can be made into a large caliber, reliable in sealing, simple in structure and convenient in maintenance. The sealing surface and the spherical surface are often in the closed state, not easy to be eroded by the medium, so it is widely used in various industries.
Carbon steel stop valve is mainly used to cut off, distribute and change the flow direction of medium in the pipeline. Gate valve is a new type of valve widely used in recent years.
Advantage
1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe section.
2. Simple structure, small volume and light weight.
3. It is tight and reliable. At present, the sealing surface material of gate valve is widely used in plastic, with good sealing performance, and also widely used in vacuum system.
4. It is easy to operate and fast to open and close. It only needs to rotate 90 ° from full open to full close, which is convenient for remote control.
5. The maintenance is convenient, the gate valve structure is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.
6. When the valve is fully open or closed, the sealing surface of the gate body and valve seat is isolated from the medium. When the medium passes through, the valve sealing surface will not be eroded.
7. It has a wide range of applications, ranging from small diameter to several millimeters and large diameter to several meters, from high vacuum to high pressure. When the ball rotates 90 degrees, it should be spherical at the inlet and outlet, so as to cut off the flow.
Working principle
Opening process
1 in the closed position, the valve body is pressed against the valve seat by the [wiki] mechanism of the valve stem.
2 when the handwheel is turned anticlockwise, the valve rod moves in reverse direction, and the angle plane at the bottom of the valve rod makes the ball free from the valve seat.
3. The valve rod continues to lift and interacts with the guide pin in the screw groove of the valve rod, so that the ball starts to rotate without friction.
4 until it reaches the full open position, the valve rod is lifted to the limit position, and the ball rotates to the full open position.