Applicable Standards:

Ball Valve Design Standards: API 6D, BS 5351, ASME B16.34

Face-to-Face Dimensions: ASME B16.10, API 6D

Flange Standards: ASME B16.5 / ASME B16.47

Butt-Weld End Standards: ASME B16.25

Fire Safe Testing: API 607, API 6A

Inspection and Testing Standards: API 598, API 6D

Design Features:

Structure: 2-piece or 3-piece body design

High-integrity sealing structure with low operating torque

Double Block and Bleed (DBB) function

Cavity self-relief mechanism

Fire-safe design

Anti-blowout stem

Anti-static design

Locking device (for lever-operated valves)

ISO 5211 actuator mounting pad

Emergency sealant injection function

Application Fields:

Oil & Gas: Wellhead equipment, pipeline pigging stations, storage tank inlets/outlets, oil and natural gas transmission

Chemical Processing: Reactor isolation, toxic media transport, high-pressure process lines

Energy & Power: Power generation, boiler fuel shut-off, main steam line isolation

Special Applications: Subsea pipelines, LNG facilities, strategic reserve depots

Brand: KOZO

Valve Materials: Carbon steel, high-temperature Cr-Mo steel, stainless steel, duplex stainless steel, Monel, aluminum bronze, special alloy steels, etc.

Valve Type: KOZO Ball Valve

Valve Testing: 100% tested prior to delivery

Warranty: 18 months after shipment or 12 months after installation (whichever occurs first)

Valve Structure: Trunnion-mounted ball valve

Size Range: 1/2" to 48"

Pressure Class: ASME Class 150, 300, 600, 900, 1500, 2500

Lead Time: 15 – 30 days

Samples: Samples available upon request from KOZO Valves

Valve Color: Customized according to customer requirements

Packaging: Plywood crates

Minimum Order Quantity (MOQ): 1 set

Country of Origin: Zhejiang, China (Mainland)

Shipping Port: Shanghai or Ningbo

Payment Terms: L/C, D/P, T/T, Western Union

Cast steel floating ball valve - an economical sealing solution for medium and large diameter low-pressure to medium-pressure pipelines

Design concept

By using the casting process to nearly form the valve body, the cost advantage of complex flow channels and large diameters is achieved. The pressure self-tightening seal is achieved by a floating sphere, with an extremely simple structure. The ball is not equipped with a fixed ear shaft. After closing, the medium pushes the ball towards the downstream valve seat, and the sealing force automatically increases with the pressure difference. Design logic: Cover the demand for large diameters above DN80 with the economic efficiency of cast steel, achieve reliable bidirectional sealing with the fewest components, and ensure the integrity of pressure boundaries in medium and low pressure conditions with the compactness of casting.

Performance advantage

Pressure self-tightening seal: When closed, the thrust of the medium pushes the ball towards the downstream valve seat. The sealing specific pressure automatically increases with the pressure difference,making the seal more reliable under high-pressure conditions.

Bidirectional airtight grade seal: Symmetrical structure, the medium can be effectively sealed no matter from which end the pressure is applied, meeting the API 598 zero-bubble acceptance standard.

Excellent low-pressure sealing: The elastic sealing ring or pre-tightening spring on the back of the valve seat provides the initial sealing force, enabling airtight shut-off even under extremely low pressure differences.

Full bore zero pressure loss: The inner diameter of the ball hole is consistent with that of the pipe, and the flow resistance is nearly zero. It can pass through a pigging device to meet the detection requirements inside the pipeline.

Economic efficiency of large diameter: The valve body is made by casting process. For DN100 and above, the material utilization rate and manufacturing cost are far superior to the forged steel solution,making it the preferred choice for large diameter medium and low pressure valves.

Minimalist structure with few components: No ear shafts, bearings or complex piston valve seats. The number of parts is only about 60% of that of fixed balls of the same diameter, making maintenance simple and convenient.

The vibration damping characteristics of cast steel: The inherent damping properties of the casting structure can absorb pipeline vibration and thermal shock, making it suitable for pulsating working conditions such as compressor outlets.

Safety performance

Anti-blowout valve stem: The valve stem is installed from the inside of the valve body, with an inverted sealing step at the bottom. Even if the cover is completely loose, the valve stem will not be blown out by the medium pressure, meeting API 608.

Fireproof structure optional: Configurable primary non-metallic seal + graphite secondary seal, certified by API 607/6FA fire test.

Anti-static conduction: A conductive path is set between the ball, valve stem and valve body, with a resistance of ≤10Ω, eliminating the risk of static electricity accumulation.

Precautions for the pressure in the middle cavity: After the liquid is retained in the middle cavity of the floating ball, the thermal expansion may cause abnormal pressure rise. It is recommended to use a ball with a pressure relief hole or an additional middle cavity discharge valve in situations prone to temperature rise.

Essential quality control of castings: 100% radiographic testing is conducted on pressure-bearing castings to ensure there are no volume defects such as shrinkage porosity and gas holes, and to guarantee the integrity of the pressure boundary.

Applicable working conditions

Medium: water, steam, oil products, natural gas, non-corrosive hydrocarbons, organic solvents

Scene: Branch pipelines of refining and chemical plants, oil receiving and dispatching systems of oil depots, cooling water circulation, gas distribution networks, branch pipelines of district heating, and chemical tank farms