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

Stainless steel floating ball valve - A simple sealing solution for medium and small diameter corrosive and cryogenic working conditions

Design concept

Austenitic stainless steel forgings or castings are used as pressure-bearing substrates, and pressure self-tightening seals are achieved with floating balls. The ball is not equipped with a fixed ear shaft. 

After closing, the thrust of the medium pushes it towards the downstream valve seat, and the sealing force automatically increases with the pressure difference. Design logic: Utilizing the corrosion resistance and wide temperature range characteristics of stainless steel to cover harsh media, reliable bidirectional sealing is achieved with the fewest components, providing a minimalist and cost-effective isolation solution for corrosive, cryogenic and high-purity working conditions with a diameter of DN200 or less.

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 zero leakage: Symmetrical structure, meeting API 598 zero bubble acceptance, reliable bidirectional off from low pressure to full pressure.

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.

Wide temperature range application: Austenitic stainless steel has no ductile-brittle transition temperature and maintains toughness and strength throughout the entire temperature range from -196°C to 538°C.

Full bore zero pressure loss: The ball hole is the same as the inner diameter of the pipe, with nearly zero flow resistance, and can pass through the pigging device.

Minimalist structure: 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.

Small in size and light in weight: Compact from surface to surface, and can be quickly opened and closed with one handle for DN50 and below.

Safety performance

Anti-blowout valve stem: Installed from the inside of the valve body, with an inverted sealing step at the bottom, meeting API 608, the valve stem will not be blown out when the cover is loosened.

Fireproof structure options: Can be equipped with primary non-metallic seal + graphite secondary seal, certified by API 607/6FA.

Anti-static conduction: The resistance between the ball, valve stem and valve body is ≤10Ω.

Applicable working conditions

Medium: Nitric acid, acetic acid, alkaline solution, seawater, LNG, liquid oxygen/liquid nitrogen, media containing chloride ions, high-purity chemicals

Scene: Branch pipelines of chemical plants, instrument pipes of offshore platforms, air separation sampling systems, food and pharmaceutical industries, branch pipelines for loading and unloading LNG tankers