Eccentric Hemispherical Valve C-type Ball Valve

Short Description:

Eccentric hemisphere valve, also known as C-type ball valve, relies on rotating hemisphere to make the valve unblocked or blocked. Its switch is light, small, can be made into a large caliber, reliable seal, simple structure, easy maintenance, sealing surface and spherical surface are often closed, not easy to be eroded by media. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc.

Product Detail

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Valve characteristics

1. The fluid resistance of eccentric hemispherical valve is small, and its resistance coefficient is equal to that of the same length pipe section.

2. It has simple structure, small volume and light weight.

3. Tight and reliable. At present, the sealing surface materials of ball valves are widely used in plastics and have good sealing performance. They have also been widely used in vacuum systems.

4. Eccentric structure design, the valve opens quickly away from the seat, reduces friction, and improves service life;

5. Easy maintenance, simple structure of ball valves, sealing rings are generally movable, disassembly and replacement are more convenient;

6. When the eccentric hemisphere valve is fully open or closed, the sealing surface of the sphere and seat is isolated from the medium. When the medium passes through, the erosion of the sealing surface of the valve will not occur.

7. It can be used in a wide range of applications, ranging from small to several millimeters in diameter and from high vacuum to high pressure.


Valve type

Upper eccentric hemisphere valve series models are DYQ340H, DYQ340Y, DYQ340F; Side eccentric hemisphere valve series models are PQ640H, PQ640Y, PY640F.


performance parameter

Working pressure(MPa) 1.6~10.0 (Calss150-Calss600)
caliber(mm) DN15-DN1200 1/2″-48″
Applicable medium Water, oil, gas, acetic acid, nitric acid and other media
Material valve body WCB CF8 CF8M CF3 CF3M
sphere WCB CF8 CF8M CF3 CF3M
Stem 2Cr13 F304 F316 F304L F316L
Sealing surface PTFE RPTFE PEEK Stellite Tungsten Carbide
filler Flexible graphite


Executive standard

Design Specification: API 6D API 608 BS 5351 GB/T12237

Structure length: ASME B16.10 GB/T12221

Flange connection: ASME B16.5 GB/T9113

Test and Inspection: GB/T 13927 API 598 API 6D

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