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 cast steel floating ball valve - an economical metal sealing solution for medium and small diameter high-temperature wear-resistant working conditions

Design concept

The valve body is made of cast steel (such as WCB/CF8M, etc.), and the complex flow channel is obtained in one go by using 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. The sealing pair adopts a fully 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: It covers the demands of small and medium-sized diameters with the economic efficiency of cast steel, achieves sealing force increase with floating ball self-tightening seals, and withstands high temperatures and particle erosion with all-metal seals. It provides a standard isolation element with a simple structure, wear resistance and long service life for harsh working conditions where soft seals below DN200 cannot handle them.

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 can work stably for a long time at high temperatures.

· 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.

· 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 media containing catalyst powder and solid particles.

· Bidirectional sealing: Symmetrical structure, meeting API 598 gas seal acceptance, bidirectional off from low pressure to high pressure.

· 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.

· Economic efficiency of cast steel: It is formed in one casting process. For DN100 and above, the comprehensive cost is significantly better than that of the forged steel solution, with small machining allowance and short delivery time.

· Simple structure: No ear shafts, bearings or complex piston valve seats. The number of components is approximately 60% of that of fixed balls, making maintenance easy.

Safety performance

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

· Anti-blowout valve stem: The valve stem is installed from the inside of the valve body, with an inverted sealing step at the bottom, meeting API 608. When the cover is loosened, the valve stem will not be blown out by the medium.

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

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

· Attention to the pressure in the middle chamber: The liquid trapped in the middle chamber of the floating ball may expand abnormally due to heat, causing an increase in pressure. It is recommended to use a ball with a pressure relief hole or an external discharge valve in high-temperature or temperature-prone situations.

Applicable working conditions

· Medium: High-temperature steam, heat transfer oil, oil slurry containing catalyst powder, high-temperature flue gas, solid-containing process medium

· Scenarios: Branch pipelines of refining and chemical plants, high-temperature steam tracing in power plants, polysilicon production, sulfur recovery, high-temperature sampling systems

· Drive: Handle, pneumatic, electric

· Selection boundary: For high-pressure large diameters above DN200 or Class 600, it is recommended to upgrade to a hard-sealed fixed cast steel ball valve