Implementation Standards

1. Design and manufacturing: GB/T26146-2010; API608;

2. Inspection and testing: GB/T13927-2010; API 598;

3. Flange connection: GB/T9113-2005; ASME/ANSI B16.5;

4. Structural length: GB/T12221-2005; ASME/ANSI B16.10;

Advantages of Hemispherical Valves

1. The structure of the valve design with external steps matching the internal steps of the valve body design effectively prevents the ball from getting stuck and the valve seat from detaching.

2. Large flow area without flow resistance: This is because the ball is hidden in the valve cavity after opening, and there is no flow resistance and direct flow channel. The flow channel is unobstructed and there will be no dust accumulation or jamming. The pressure loss is small and the medium will not be deposited in the valve cavity.

3. Easy to switch: Due to the principle of eccentricity, the ball and the valve seat are completely separated when opening, without any contact, the opening and closing torque is small, and the opening and closing can be completed by turning 90 degrees, which is easy to operate.

4. Reliable sealing and long service life: Under the action of double eccentricity, when this valve is closed, the eccentric ball and the valve seat are more and more tightly closed, and the purpose of good sealing is fully achieved; there is a shearing and squeezing effect between the ball and the valve seat with a hemispherical cut, which can effectively remove the scaling or dirt on the sealing surface and maintain a good seal. Under the action of double eccentricity, when the valve is opened, the ball and the valve seat are completely separated without any contact, and there is no friction between the ball and the valve seat, which effectively overcomes the problem of constant friction between the ball sealing surface and the valve seat sealing surface of the traditional ball valve, so the sealing surface is well protected. The sealing surface is wear-resistant, and there is compensation between the valve seat and the ball. When the valve seat is worn, it can still be reliably sealed by turning it a little when closed. In addition, the valve seat can be adjusted or replaced to extend the service life. This is the most significant feature of the hemispherical valve.

5. Produce various wear-resistant, corrosion-resistant, high-temperature-resistant, etc. according to different temperatures and different media.

Valve body material: GB:WCB; ASTM:A216 WCB

Nominal pressure PN: 1.6～6.4MPa;150-600Class

Nominal diameter DN: 50～2000mm

Leakage rate: ＜0.1×DNmm³/s〔Comply with GB/T13927-2005 standard〕

Operating temperature T: Soft seal: -40～350℃; Hard seal: -50～600℃

Applicable media: Natural gas, steam, oil, acid, alkali, coal powder, coal ash, waste residue, mud, granular, fiber and other media

Operating mechanism: Worm gear drive, electric drive, pneumatic drive, hydraulic drive