Double eccentric half ball valve,DOUBLE ECCENTRIC VALVE,ball valve

First, the eccentric half ball valve has the following advantages:

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

2. Simple structure, small size, light weight.

3. Tight and reliable, the sealing surface material of the ball valve is widely used in plastic, good sealing, and has also been widely used in vacuum systems.

4. Easy to operate, open and close quickly, from full open to full close as long as the rotation of 90 degrees, easy to remote control.

5. Easy maintenance, ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient.

6. When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when it passes through.

Seven. Wide range of application, small diameter to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied.

High platform ball valve according to its channel position can be divided into straight-through, three-way and right-angle. The latter two ball valves are used to distribute the medium and change the flow direction of the medium. Three-piece ball valve installation and maintenance should pay attention to the following matters:

1. Leave the position for the valve handle to rotate.

2. Can not be used as throttling.

3 Ball valves with transmission mechanisms should be installed upright.

Second, the working principle of eccentric half ball valve:

The valve is opened or blocked by rotating the valve chain. Ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and sphere are often in a closed state, not easy to be washed by the medium, in various industries have been widely used.

Three, the eccentric half ball valve is mainly used to cut off in the pipeline

, 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:

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

2. Simple structure, small size, light weight.

3. Tight and reliable, the sealing surface material of the ball valve is widely used in plastic, good sealing, and has also been widely used in vacuum systems.

4. Easy to operate, open and close quickly, from full open to full close as long as the rotation of 90 degrees, easy to remote control.

5. Easy maintenance, ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient.

6. When fully open or fully closed, the sealing surface of the ball and the seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when it passes through.

Seven. Wide range of application, small diameter to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied. When the ball is rotated 90 degrees, the inlet and outlet should all be spherical, thus cutting off the flow.

Eccentric half ball valve is a relatively new type of ball valve category, it has its own structure has some unique advantages, such as no friction switch, seal is not easy to wear, small opening and closing torque. This reduces the size of the configured actuator. With a multi-turn electric actuator, the medium can be adjusted and tightly cut off. It is widely used in petroleum, chemical industry, urban water supply and drainage and other conditions requiring strict cut-off

Four, the working principle of the eccentric half ball valve is as follows:

A. Start the process

1 In the closed position, the ball is pressed against the seat by the [wiki] mechanical [/wiki] pressure of the stem.

2 When the handwheel is turned counterclockwise, the valve stem moves in reverse, and its bottom angular plane causes the ball to release from the seat.

3 The valve stem continues to lift and interact with the guide pin in the spiral groove of the valve stem so that the ball begins to rotate without friction.

4 Until the full open position is reached, the stem is raised to the limit position, and the ball is rotated to the full open position.

B. Closing process

1 When closed, turn the handwheel clockwise, the stem begins to drop and the ball begins to rotate away from the seat.

2 Continue to rotate the handwheel, the valve stem is subject to the action of the guide pin embedded in its upper spiral groove, so that the valve stem and the ball rotate 90° at the same time.

3 When close, the ball has rotated 90° without contact with the seat.

4 For the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges towards the compression ball so that it is pressed tightly against the seat to achieve a complete seal.

Five, eccentric half ball valve structure characteristics:

1. Frictionless opening and closing. This function completely solves the problem that the sealing of traditional valves is affected by the friction between the sealing surfaces.

2, top type structure. The valve installed on the pipeline can be directly checked and repaired online, which can effectively reduce the device parking and reduce the cost.

3, single seat design. The problem that the medium in the valve cavity is affected by abnormal pressure increase is eliminated.

4, low torque design. The valve stem with special structure design can be easily opened and closed with a small hand handle.

5, wedge sealing structure. The valve is sealed by the mechanical force provided by the valve stem, and the ball wedge is pressed to the seat, so that the sealing 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 sealing surface. When the ball tilts away from the seat, the fluid in the pipeline passes 360° evenly along the sealing surface of the ball, which not only eliminates the local erosion of the high-speed fluid on the seat, but also washes away the accumulation on the sealing surface to achieve the purpose of self-cleaning.

Double eccentric half ball valve suitable for all kinds of general industry requirements of the valve, such as water, sewage, waste water, steam, gas, pulp and other media. If the sealing pair uses Cr-Mn-Si cemented carbide, and has fire-resistant, explosion-proof and anti-static functions, it is suitable for medium and high temperature medium requirements, such as gas, coke oven gas, water gas and natural gas. If the sealing pair (half ball, seat) and the valve body channel are processed by tungsten carbide special process, it has the advantages of high efficiency and energy saving, good wear resistance, reliable sealing performance, light operation, quick opening and closing, long service life, etc., which is the ideal choice for valves used in industrial silicon industry pipelines. Due to the instantaneous separation of the half ball from the seat and the instantaneous compression characteristics, it is suitable for the harsh conditions containing particles in the medium, and can be widely used in the production process of metallurgy, beneficiation, electric power and other blast furnace pulverized coal injection, pulverization system and dust removal system in various pipeline control. In the process of instant disengagement and instant compaction, the squeezing effect between the half ball and the seat can remove the scale and adhesion on the sealing surface, and ensure the tight and reliable seal. The valve is the ideal choice for conveying two-phase mixed fluid medium in the process flow such as solution pulp, slurry ash and slag which is easy to precipitate scale and crystallization.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 470 gallon liquid totes Special package is available on request. E FORUs’  is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.