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

Hard-sealed fixed cast steel ball valve - a low-torque metal sealing solution for large-diameter high-temperature and wear-resistant working conditions

Design concept

The valve body is made of cast steel (such as WCB/CF8M, etc.), and the full-through flow channel and reinforcing ribs are formed in one piece by casting process. The sphere is fixedly supported by the ear shaft. The medium thrust is introduced into the valve body through the ear shaft, and the sealing surface only bears the controllable spring preload force. The sealing pair is of an all-metal hard sealing structure. The sealing surfaces of the ball and the valve seat are surfacing with hard alloys such as Stellite or tungsten carbide and are precisely ground. Core logic: Cover the demand for large diameters with the economic efficiency of cast steel, achieve low-torque operation and uniform wear with ear shaft support, and resist high temperatures and particle erosion with all-metal seals. Provide wear-resistant, long-life, and easy-to-operate isolation components for the harsh working conditions of large diameters that soft seals cannot handle.

Performance advantage

· All-metal hard sealing pair: The sealing surfaces are all made of hard alloy, with no non-metallic soft sealing elements. The upper limit of applicable temperature far exceeds that of PTFE/PEEK, and it remains stable for a long time at high temperatures.

· Resistance to particle erosion: The sealing surface of Stellite or tungsten carbide hard alloy has extremely high hardness and can resist the erosion and wear of solid particle media containing catalyst powder, slurry, coal powder, etc.

· 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 medium in the downstream valve seat is self-tightened, and the spring in the upstream valve seat is pre-tightened. Combined with a precisely ground hard sealing pair, it meets the API 598 zero-bubble acceptance, ensuring reliable bidirectional disconnection from low pressure to high 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: The complex valve body is cast in one piece, and the comprehensive cost for DN150 and above is significantly better than that of the forged steel solution.

· No cold flow creep: The all-metal seal does not have the cold flow deformation problem of PTFE-like materials. The long-term pressure-holding seal does not loosen, and its service life far exceeds that of soft seals.

· Full diameter and low flow resistance: The ball holes are the same as the inner diameter of the pipe, with nearly zero pressure loss, and can pass through the pigging device.

Safety performance

· Intrinsic fire resistance: The all-metal hard sealing pair itself is a fireproof structure. In case of fire, there is no need to rely on non-metallic secondary seals, directly meeting the API 607/6FA requirements.

· 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.

· High-temperature thermal stability: The metal seal matches the thermal expansion coefficient of the valve body, ensuring no jamming or leakage at high temperatures.

Applicable working conditions

· Medium: High-temperature steam, heat transfer oil, oil slurry containing catalyst particles, ore slurry, black water from coal chemical industry, high-temperature flue gas, solid-containing process medium

· Scene: Catalytic cracking unit in refining and chemical industry, gasifier in coal chemical industry, high-temperature steam system in power plant, pulp conveying pipeline, polysilicon production, sulfur recovery

· Drive: worm gear, pneumatic, electric, hydraulic