The three-piece threaded valve is a kind of chemical pipe fittings. There are T shape and Y shape. There are also reducers. For the junction of three pipes.
The pipe connectors machined by round steel or steel ingot die forging, its connection form is socket welding, the steel pipe is inserted into the socket hole for welding, so it is called "socket pipe fittings", the main manufacturing standard ANSI/ASME B16.11, MSS SP-83, GB/T 14383-2008.
Socket Fittings
The varieties of socket pipe fittings include 45°elbow, 90°elbow, socket tee, cross, 45°oblique tee, double socket pipe clamp, single socket pipe clamp, pipe cap, union, branch pipe seat and so on. Among them, tees and crosses have equal diameters and different diameters; double-socket pipe clamps also have equal diameters and different diameters, and double-socket pipe clamps with different diameters can also be divided into concentric and eccentric.
Stainless steel 3pc threaded ball valve
Stainless steel 3pc threaded ball valve Stainless steel 3pc threaded ball valve and flange gate valve belong to the same type of valve, the difference is that its closing part is a sphere, and the sphere 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. Two-piece ball valve and three-piece ball valve are a new type of valve widely used in recent years.
First, the stainless steel 3pc threaded ball valve has the following advantages:
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.
2. Simple structure, small size and light weight.
3. It is compact and reliable. At present, the sealing surface material of the ball valve is widely used in plastics, which has good sealing performance and has been widely used in vacuum systems.
4. Easy to operate, fast opening and closing, only need to rotate 90°from fully open to fully closed, which is convenient for remote control.
5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is more convenient to disassemble and replace.
6. When fully open or fully closed, the sealing surface of the ball and the valve seat is 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 as small as a few millimeters and as large as several meters, and can be applied from high vacuum to high pressure.
High platform ball valves can be divided into straight-through type, 3pc threaded type and right-angle type according to the channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium. The installation and maintenance of the three-piece ball valve should pay attention to the following items:
1. Leave a position for the valve handle to rotate.
2. Cannot be used as throttling.
3 Ball valves with transmission mechanisms should be installed upright.
Second, the working principle of the stainless steel 3pc threaded ball valve is to make the valve unblocked or blocked by rotating the valve. The ball valve is easy to switch, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and spherical surface are always in a closed state, which is not easy to be eroded by the medium, and has been widely used in various industries.
Third, the stainless steel 3pc threaded ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Ball valve is a new type of valve widely used in recent years, it has the following advantages:
1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.
2. Simple structure, small size and light weight.
3. It is compact and reliable. At present, the sealing surface material of the ball valve is widely used in plastics, which has good sealing performance and has been widely used in vacuum systems.
4. Easy to operate, fast opening and closing, only need to rotate 90°from fully open to fully closed, which is convenient for remote control.
5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is more convenient to disassemble and replace.
6. When fully open or fully closed, the sealing surface of the ball and the valve seat is 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 as small as a few millimeters and as large as several meters, and can be applied from high vacuum to high pressure. When the ball rotates 90 degrees, all the inlet and outlet should appear spherical, so as to cut off the flow.
The stainless steel 3pc threaded ball valve is a relatively new type of ball valve. It has some advantages unique to its own structure, such as no friction on the switch, no easy to wear the seal, and small opening and closing torque. This reduces the size of the associated actuator. Equipped with a multi-turn electric actuator, it can realize the adjustment and strict cutting off of the medium. Widely used in Petroleum, Chemical, urban water supply and drainage and other working conditions that require strict cut-off.
Fourth, its working principle is as follows:
A. Start the process
1 In the closed position, the ball is pressed against the valve seat by the mechanical[/wiki] pressure of the valve stem.
2 When the hand wheel is turned counterclockwise, the valve stem moves in the opposite direction, and the angular plane at the bottom of the valve makes the ball disengage 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, so that the ball starts to rotate without friction.
4 until it reaches the fully open position, the valve stem is raised to the limit position, and the ball rotates to the fully open position.
B. Closing process
1 When it is closed, turn the handwheel clockwise, the valve stem will start to drop and the ball will leave the valve seat and start to rotate.
2 Continue to rotate the handwheel, and the valve stem is acted by the guide pin embedded in the spiral groove on it, so that the valve stem and the ball rotate 90°at the same time.
3 When it is about to close, the ball has rotated 90° without contact with the valve seat.
4 During the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball to press it tightly against the valve seat to achieve a complete seal.
Fifth, the structural characteristics of the stainless steel 3pc threaded ball valve:
1. Open and close without friction. This function completely solves the traditional valve. The problem of affecting the seal due to mutual friction between the sealing surfaces.
2. Top-loading structure. The valve installed on the pipeline can be inspected and repaired directly online, which can effectively reduce the shutdown of the device and reduce the cost. This type of valve should generally be installed horizontally in the pipeline.
3. Single seat design. It eliminates the problem that the medium in the cavity of the valve affects the safety of use due to abnormal pressure increase.
4. Low torque design. The valve stem with special structural design can be easily opened and closed with only a small handle.
5. Wedge sealing structure. The valve is sealed by pressing the ball wedge to the valve seat with the mechanical force provided by the valve stem, so that the sealing performance of the valve is not affected by the change of pipeline pressure difference, and the sealing performance is reliably guaranteed under various working conditions.
6. Self-cleaning structure of the sealing surface. When the ball tilts away from the valve seat, the fluid in the pipeline passes evenly at 360°along the ball sealing surface, which not only eliminates the local erosion of the valve seat by the high-speed fluid, but also washes away the accumulation on the sealing surface, achieving the purpose of self-cleaning .
Post time: Apr-26-2023