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 Fixed Ball Valve - Cast steel low-torque isolation solution for large-diameter medium and high-pressure working conditions

Design concept

The ASTM A216 WCB cast steel is used as the pressure-bearing shell, and the full-through flow channel, reinforcing ribs and discharge interface are formed in one piece by the casting near-final forming process. The sphere is fixed and supported by ear shafts. The medium thrust is directly introduced into the valve body through the upper and lower ear shafts, and the sealing surface only bears the controllable spring preload force. Core logic: With the economic efficiency of WCB cast steel to meet the demands of large diameters, and with ear shaft support to counteract the thrust of the medium, achieve low-torque operation and uniform sealing wear, it provides low-cost and high-performance standard isolation components for non-corrosive medium pipelines with Class 150-900 and DN80 and above.

Performance advantage

· Low operating torque: The medium thrust is carried by the ear bearing, and the torque is only 1/3 to 1/5 of that of the floating ball of the same specification, significantly reducing the specification and procurement cost of the actuator.

· Bidirectional airtight grade seal: The downstream valve seat medium is self-tightened, and the upstream valve seat spring is pre-tightened, meeting the API 598 high-pressure gas seal zero bubble acceptance, and reliable bidirectional disconnection from low pressure to full pressure.

· Cavity pressure self-relief: The upstream valve seat automatically slightly opens to release the abnormal pressure rise in the middle cavity caused by thermal transients, without the need for an external safety valve, ensuring intrinsic safety.

· Uniform sealing wear: The ball is precisely centered and limited by the ear shaft, without eccentric wear. The wear rate of the upstream and downstream valve seats is consistent, and the sealing life is multiplied.

· Economic efficiency of large diameters: For complex valve bodies formed in one casting process, the material utilization rate and comprehensive cost for DN150 and above are significantly better than those of the forged steel solution.

· 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.

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

Safety performance

· Fireproof structure: Standard equipped with primary non-metallic seal + secondary graphite/metal seal, certified by API 607/6FA, maintaining effective shut-off in case of fire.

· Anti-blowout valve stem: The reverse sealing step design complies with API 608. Even when the cover is completely loosened, the valve stem will not be blown out by the medium pressure.

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

· Cavity pressure self-relief protection: The upstream valve seat automatically relieves pressure to prevent deformation or rupture of the middle cavity due to pressure build-up.

· Casting density guarantee: All pressure-bearing castings undergo strict non-destructive testing to eliminate volume defects such as shrinkage porosity and gas holes, ensuring the integrity of the pressure boundary.

Applicable working conditions

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

· Scenarios: Cut-off at the entry and exit of long-distance pipeline stations, main process pipelines of refining and chemical plants, high-pressure water supply and steam in power plants, offshore platforms, and pulp transportation

· Drive: worm gear, pneumatic, electric, hydraulic