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Kata Valve (Group) Co., Ltd.
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Brand Name : KATA
Certification : TS A1, CE, ISO, API6D, API 607, API 6FA
Place of Origin : SHANGHAI,CHINA
MOQ : 1 piece
Supply Ability : 5000pieces per month
Delivery Time : 5~35days
Packaging Details : by wooden case
Pressure rating : Class 150~ Class 2500
Material : WCB, LCB, CF8, CF8M, CF3, CF3M, A105, LF2, F403, F316, F304L, F316L
Design & Manufacturing Standard : API608, API6D, BS5351, ASME B16.34
Face to Face : ASME B16.10, API6D
End connection : ASME B16.5, ASME B16.47, ASME 16.25
Test and Inspection : ISO5208, API6D
Operation Method : Manual, Worm Gear, Electric Actuator, Pneumatic Actuator
Size : 2"~56"
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Eccentric half ball valve Principle of work
When the eccentric semi-ball valve is driven by the stem to move around the rotary center the orbiting of the ball is a cam-like eccentric and it goes downward into the valve to have the valve closed and kept sealed. Because of the available with the above principle of cam, the force of the closing part which acts at the seat ring will be gradually enlarge during open and close, that is the surface of the part contacts the seat ring from complete come-away and the specific pressure of sealing gets gradually enlarged till being completely sealed, vice versa. This makes the previous sealing state and effect of the ball valve greatly improved. The semi-ball valve is applicable for the cases of high temperature high pressure and easy crystallization and serious worn-out.

Eccentric half ball valve Structural features
One of the eccentric semi-ball valve features is no friction at open-close. Because of the eccentric structure, the ball gradually goes closed to the seat ring, during the valve close, till getting completely contacted at the closed position and, during valve open, the ball leaves the sealed position, e.g. completely comes away, a small opening torque. The second feature is that the sealing face can carry out self-cleaning. When the ball comes away from the seat ring, the medium may rinse out the accumulated objects on the face and, for easily crystallized medium, the ball, during valve close, can cut off the crystal and get to the purpose of sealing, avoiding the problem with other valves unable to be opened and closed. The third one comes as tight sealing. Both ball and seat ring are bi-metal and, by means of different technologies, the sealing face can be combined into corrosion-proof, wearable etc. various types to meet with different working conditions. The sealing is formed by the contact of the sphere connecting line and zero-leak is made realized by the two-dimensional eccentric.

Eccentric half ball valve Applicable cases
Per the purpose, the semi-ball valve can be divided into: universal valve, pipeline valve, slurry used valve, gas used valve, petrochemical used valve, coal power spraying and blowing used valve six series, and used for petroleum, chemical, metallurgy, electric power, gas, ash discharge, coal powder spray etc. industries and as the update products for gate valves, stop valves and Y-type valves.

Eccentric semi-ball valve and flange valve belong to the same type of but the difference is that the closure member of eccentric semi-ball valve is a sphere and this sphere can rotate around the center line of the body to achieve the open and close movement. Ball valves are mainly used for cutting, distribution and changing the direction of the media flow in pipeline application. Two-piece ball valves and three piece ball valves are new kind of valves which have been widely used in recent years.

Eccentric semi-ball valves are suitable for waste water treatment, paper pulp, alumina, urban heating, as well as power plants, hydraulic slag removal or gas pipeline.

Eccentric semi-ball valve is composed of body, eccentric shaft, bonnet, spherical cap, axle sleeve, seat and other components. With 90 degree rotation by eccentric shaft, the valve can achieve open and close movements and plays a role in cutting off the media. Eccentric half ball valve can avoid the friction between the seat and spherical cap and because of the adoption of eccentric crank, there is an eccentricity between the center line of the spherical cap and valve runner. When the valve is open, the crank turns at a slight angle. At this moment, the spherical cap will leave the seat and having no more connection; on the contrary, in the close process, only in the close moment can the spherical cap contact with the seat.

With the advantage of simple structure, small size, light weight, convenient use, easy maintenance and other merits, eccentric semi-ball valve can be used in many industries with high efficiency. As The growing demand for this kind of valve, accelerating the development of eccentric semi-ball valves has been put on the agenda. We do believe that they are bound to make greater contributions to China’s economic construction in the future.

Eccentric Flanged Semi-Ball Valve

1. Certification: ISO9001, API600, CE, TS
2. Size: 2"-56"
3. Pressure: Class 150LB-1500LB
4. Material: Carbon Steel/Stainless Steel
5. Brand Name: KATA or OEM
6. Guarantee: 18months
7. Suitable medium: water, oil, gas....

Design and Manufacture: API600 ,ASME B 16.34, API6D, BS5351
Inspection and Test: API598
End flange dimension: ASME B16.5 (for NPS≤24); AMSE B16.47 series B
Socket-weld dimension: ASME B16.11
Face to face and end to end: ASME B 16.10
Pressure/temperature rating: ASME B16.34
Materials: LCB, LCC, CF8, CF8M, CF3, CF3M, A105, LF2, F11, F22, F5, F304, F316, F304L, F316L
Operation: Handwheel, Bevel Gear, Pneumatic, Electric

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