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 forged steel fixed ball valve - wear-resistant and low-torque isolation solution for high-temperature and high-pressure solid-containing working conditions

Design concept

The high-pressure boundary is supported by a dense forged steel valve body, and the ball is fixed and supported by an ear shaft, guiding the medium thrust into the valve body instead of pressing against the sealing surface. The sealing pair is of an all-metal hard sealing structure. The sealing surface of the ball and the valve seat is surfacing with Stellite or tungsten carbide and other hard alloys, and is precisely ground to achieve an airtight fit. Core logic: Eliminate casting defects through forging, achieve low-torque operation and uniform wear with ear shaft support, and resist high temperatures, particle erosion and high-frequency opening and closing with all-metal seals, providing long-life and highly reliable standard isolation components for harsh working conditions 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.

· 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.

· Extremely low operating torque: The medium thrust is carried by the ear bearing, and the sealing surface only bears the controllable spring preload force. The torque is 1/3 to 1/5 of that of the floating ball of the same specification, and the actuator specification is small.

· Cavity pressure self-relief: The upstream valve seat can automatically slightly open to release the abnormal pressure increase in the middle cavity into the upstream pipeline, without the need for an external safety valve.

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

· High-pressure densification of forged steel: The grain flow lines of forgings are continuous, and the wall thickness is uniform. Under high pressure and alternating loads, the integrity of the pressure boundary is better than that of cast steel.

· No cold flow creep: The metal seal does not have the cold flow deformation problem of PTFE-like materials, and the long-term pressure maintaining seal does not loosen.

Safety performance

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

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

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

· High-temperature thermal stability: The metal sealing material 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