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

Carbon steel fixed ball valve - A low-torque isolation solution for large-diameter medium and high-pressure non-corrosive working conditions

Design concept

The pressure-bearing shell is made of carbon steel (A105 forged steel or WCB cast steel), and the forging or casting process path is selected according to the diameter and pressure rating. The sphere is fixedly supported by ear shafts. The medium thrust is directly introduced into the valve body through the upper and lower ear shafts. The sealing surface only bears the controllable spring pre-tightening force, and the operating torque is basically decoupled from the medium pressure. Core logic: With the mature and reliable cost-performance ratio of carbon steel to cover conventional working conditions, the fixed ball structure is used to dissolve large-diameter high-pressure thrust, achieve low-torque operation and uniform sealing wear, providing economical, standard and long-life isolation components for pipelines of non-corrosive media such as water, steam, oil products and natural gas.

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.

· A105 forged steel high density: Forged steel valve bodies are selected for small-diameter high-pressure working conditions, with continuous grain flow lines and excellent integrity at pressure boundaries above Class 600.

· Economic efficiency of WCB cast steel for large diameters: For large diameters, cast valve bodies are selected, and complex flow channels and reinforcing ribs are formed in one piece. The comprehensive cost for diameters above DN150 is significantly better than that of forged steel.

· 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.

Applicable working conditions

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

· Scenarios: Station entry and exit shut-off of long-distance pipeline networks, high-pressure piping systems on offshore platforms, main process pipelines of refining and chemical plants, high-pressure water supply and steam in power plants, slurry transportation, high-pressure water injection systems

· Drive: worm gear, pneumatic, electric, hydraulic

· Material selection guidance: A105 forged steel valve bodies are preferred for high pressure above Class 600 or for high density requirements. For large diameters of DN200 and above, WCB cast steel valve bodies are preferred to achieve the best economic efficiency