The working principle of three-way T-shaped ball valve and three-way L-shaped ball valve
Three way ball valves come in T-shaped and T-shaped versions. T-shaped can connect three orthogonal pipelines and cut off the third channel, playing a role in diversion and merging. The L-shaped three-way ball valve can only connect two pipes that are orthogonal to each other, and cannot maintain the interconnection of the third pipe at the same time. It only plays a distribution role. Three way ball valves are mainly used in pipelines to cut off, distribute, and change the flow direction of media. Three way ball valve is a relatively new type of ball valve, which has some unique structural characteristics such as frictionless opening and closing, low sealing wear, and small opening and closing torque. This can reduce the specifications of the accompanying actuator. The working principle of a three-way ball valve is to rotate the valve to make it open or close. Ball valve switches are lightweight, small in size, can be made into large diameters, reliable in sealing, simple in structure, easy to maintain, and the sealing surface and spherical surface are often in a closed state, which is not easily eroded by media. They are widely used in various industries.
Instructions for using three-way T-shaped ball valve and three-way L-shaped ball valve:
A. Opening process
In the closed position, the ball is tightly pressed against the valve seat by the mechanical pressure of the valve stem.
When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane causes the ball to detach from the valve seat.
3. The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem, causing the ball to start rotating frictionlessly.
4. Until it reaches the fully open position, the valve stem is lifted to the limit position, and the ball rotates to the fully open position.
B、 Closing process
When closing, rotate the handwheel clockwise and the valve stem begins to descend, causing the ball to move away from the valve seat and begin to rotate.
2. Continue to rotate the handwheel, and the valve stem is acted upon by the guide pin embedded in its spiral groove, causing the valve stem and ball to rotate 90 * simultaneously.
3. When it was about to close, the sphere had already rotated 90 degrees without contact with the valve seat.
4. In the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges and presses the ball tightly against the valve seat, achieving sealing.
Characteristics of three-way ball valve:
1. The three-way ball valve adopts an integrated structure in terms of structure, with a sealing type of 4-sided valve seats, few flange connections, high reliability, and lightweight design
2. Three way ball valves have a long service life, high flow capacity, and low resistance
3. Three way ball valves are divided into single acting and double acting types according to the action type. The characteristic of single acting type is that once the power source fails, the ball valve will be in the state required by the control system. Ball valves and gate valves belong to the same type of valve, with the difference being that their closing element is a sphere, which rotates around the centerline of the valve body to achieve opening and closing. Ball valves are mainly used in pipelines to cut off, distribute, and change the flow direction of media. Ball valve is a widely used new type of valve,
It has the following advantages:
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe segment of the same length.
2. Simple structure, small size, and light weight.
3. Tight and reliable, the sealing surface material of ball valves is widely made of plastic, with good sealing performance, and has also been widely used in vacuum systems.
4. Easy to operate, quick opening and closing, only need to rotate 90 * from fully open to fully closed, making it convenient for remote control.
5. Easy maintenance, simple ball valve structure, and generally movable sealing rings make disassembly and replacement relatively convenient.
When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, it will not cause erosion of the valve sealing surface.
7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be used from high vacuum to high pressure.