Some Basic Knowledge about 2-PC Ball Valve_Cangzhou Cencho|valves|pipe fittings

Some Basic Knowledge about 2-PC Ball Valve

Published on:

2019-06-28

Some Basic Knowledge about 2-PC Ball Valve

The stainless steel 2-PC ball valve and the flange gate valve are the same type of valve. The difference is that the closing member is a ball, and the ball rotates around the center line of the valve body to open and close a valve. The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. Two-piece ball valve, three-piece ball valve, is a new type of valve widely used in recent years.

Advantage of stainless steel 2-PC ball valve

1. The fluid resistance is small, and its resistance coefficient is equal to the pipe length of the same length.

2. The structure is simple, small in size and light in weight.

3. It is close and reliable. At present, the sealing surface material of the ball valve is widely used in plastic and has good sealing performance. It has also been widely used in vacuum systems.

4. The operation is convenient, the opening and closing is rapid, and the rotation is 90° from full opening to full closing, which is convenient for long-distance control.

5. The maintenance is convenient, the ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.

6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.

7. Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied.

Stainless steel two-piece ball valves can be divided into straight-through, three-way and right-angle types according to their channel positions. The latter two ball valves are used to distribute the medium and change the direction of the medium. Stainless steel two-piece ball valve

2-PC ball valve Precautions:

1. Leave the position where the valve handle rotates.

2. Cannot be used for throttling.

The ball valve with 3 transmission mechanism should be installed upright.

Second, the working principle of the stainless steel two-piece ball valve is to make the valve unblocked or blocked by the rotary valve love. The ball valve switch is light in weight, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and the spherical surface are often closed, and is not easily eroded by the medium, and is widely used in various industries.

Third, the stainless steel two-piece ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. Ball valve is a new type of valve widely used in recent years, which has the following advantages:

1. The fluid resistance is small, and its resistance coefficient is equal to the pipe length of the same length.

2. The structure is simple, small in size and light in weight.

3. It is close and reliable. At present, the sealing surface material of the ball valve is widely used in plastic and has good sealing performance. It has also been widely used in vacuum systems.

4. The operation is convenient, the opening and closing is rapid, and the rotation is 90° from full opening to full closing, which is convenient for long-distance control.

5. The maintenance is convenient, the ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.

6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.

7. Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied. When the ball is rotated 90 degrees, all the spheres should appear at the entrance and exit, thus cutting off the flow.

The stainless steel two-piece ball valve is a relatively new type of ball valve, which has some unique advantages unique to its structure, such as the switch without friction, the seal is not easy to wear, and the opening and closing torque is small. This reduces the size of the actuators that are supplied. With multi-turn electric actuators, the medium can be adjusted and tightly closed. It is widely used in petroleum, chemical, urban water supply and drainage and other conditions that require strict cutting.

Working Principle of 2-PC ball valve

A. Opening process 1 In the closed position, the ball is pressed by the mechanical pressure of the valve stem and pressed against the valve seat.

2 When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and the bottom angular plane causes the ball to disengage from the valve seat.

3 The valve stem continues to lift and interacts with the guide pins in the spiral groove of the valve stem, causing the ball to start rotating without friction.

4 Until the fully open position, the stem is raised to the extreme position and the ball is rotated to the fully open position.

B. Closing process 1 When closing, turn the handwheel clockwise, the valve stem begins to descend and the ball moves away from the valve seat.

2 Continue to rotate the hand wheel. The valve stem is subjected to the guide pin embedded in the upper spiral groove, so that the valve stem and the ball rotate at 90° at the same time.

3 When it is about to close, the ball has rotated 90° without contact with the seat.

4 In the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball, causing it to press tightly against the valve seat for a complete seal.

Structural features

1. Open and close without friction. This function completely solves the problem that the conventional valve affects the sealing due to the friction between the sealing faces.

2. Top-loading structure. The valve installed on the pipeline can be directly inspected and repaired online, which can effectively reduce the parking of the device and reduce the cost.

3, single seat design. It eliminates the problem that the cavity medium in the valve affects the safety of use due to abnormal boosting.

4. Low torque design. The specially designed valve stem can be easily opened and closed with a small handle.

5. Wedge seal structure. The valve is mechanically supported by the valve stem, and the ball wedge is pressed onto the valve seat to seal, so that the sealing property of the valve is not affected by the change of the pressure difference of the pipeline, and the sealing performance is reliably guaranteed under various working conditions.

6. Self-cleaning structure of the sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline passes through the spherical sealing surface at 360°, which not only eliminates the high-speed fluid scouring on the valve seat, but also washes away the accumulation on the sealing surface to achieve self-cleaning.