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

WCB Floating Ball Valve - An economical sealing solution for medium and large diameters in medium and low pressure conditions made of cast steel

Design concept

The ASTM A216 WCB cast steel is used as the pressure-bearing shell, and the full-through flow channel and flange are formed in one piece by the casting near-final forming process. The ball is not equipped with a fixed ear shaft. After closing, the medium pressure pushes it towards the downstream valve seat, and the sealing force automatically increases with the pressure difference. Core logic: It covers the medium and large diameter requirements from DN50 to DN200 with the economic WCB cast steel, achieves reliable bidirectional sealing with a simple floating structure, and provides low-cost and structurally simple standard isolation components for medium and low pressure non-corrosive medium pipelines.

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 high-pressure gas seal 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.

· Full bore zero pressure loss: The ball hole is the same as the inner diameter of the pipe, with nearly zero flow resistance, allowing it to pass through the pigging machine.

· Economic efficiency of large diameters: One-time casting, high material utilization rate, and the comprehensive cost for DN100 and above is significantly better than that of the forged steel solution.

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

· Structural damping and vibration reduction: The inherent damping characteristics 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 when the cover is completely loosened, the valve stem will not be blown out by the medium pressure, meeting the mandatory requirements of API 608.

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

· Anti-static electricity conduction: The resistance between the ball, valve stem and valve body is ≤10Ω, and static electricity is conducted away in time.

Note on the pressure in the middle cavity: The liquid trapped in the middle cavity of the floating ball may abnormally increase pressure due to thermal expansion. It is recommended that in situations prone to temperature rise, a ball with a pressure relief hole or an additional middle cavity discharge valve be selected.

Applicable working conditions

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

· Scene: Oil depot receiving and dispatching system, chemical branch pipelines, cooling water circulation, gas distribution network, district heating branch pipelines, chemical tank farm

· Drive: Handle, worm gear, pneumatic, electric

· Selection boundary: For high-pressure large diameters above DN200 or Class 600, it is recommended to upgrade to WCB fixed ball valves