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 pneumatic fixed ball valve - a fail-safe quick-action isolation solution for large-diameter medium and high-pressure pipelines

Design concept

The pressure-bearing valve body is made of carbon steel (WCB cast steel or A105 forged steel), and the ball is fixed and supported by the ear shaft. The medium thrust is introduced into the valve body through the ear shaft, and the operating torque and pressure are basically unhooked. The pneumatic actuator is standard-equipped with a single-acting spring return function, which automatically returns to a safe position when air or power is cut off. Core logic: Utilizing a fixed ball structure to counteract large-diameter high-pressure thrust and achieve low-torque operation. The pneumatic spring reset is used to achieve intrinsically safe rapid emergency cut-off, providing fault-safe, easy-to-operate and evenly sealed life automated isolation components for non-corrosive medium pipelines with Class 150-900 and DN80 and above.

Performance advantage

· Fail-safe reset: Single-acting cylinder spring reset. When the air source or power supply is interrupted, the valve automatically closes or opens, naturally meeting the logic requirements of ESD emergency shut-off.

· Quick opening and closing: The full stroke time can reach the 1-second level, far superior to electric heads, making it the preferred drive for emergency quick closing conditions.

· Extremely low operating torque: The medium thrust is carried by the ear bearing, with a torque of only 1/3 to 1/5 of that of the floating ball of the same specification. It can be matched with smaller cylinder bore actuators, reducing the cost of complete set procurement.

· 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.

· Intrinsic explosion-proof safety: Powered by compressed air, it poses no risk of electrical sparks and is directly applicable to explosion-proof areas in petrochemicals, with extremely low explosion-proof costs.

· 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

· Fault safety: Single-acting spring return, automatic on/off in case of gas source interruption, meeting SIL 2/SIL 3 safety integrity loop requirements. It can be equipped with a quick-release valve to further shorten the reset time.

· 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.

· Fire and explosion-proof actuator: Solenoid valves and limit switches can be optionally equipped with Ex ia/Ex d explosion-proof certification.

Applicable working conditions

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

· Scenarios: ESD emergency shut-off at long-distance pipeline stations and yards, remote switch on offshore platforms, main process pipelines of refining and chemical plants, high-pressure water supply and steam in power plants, flare venting systems

· Drive: Pneumatic single-acting spring return/double-acting; Fork type (large diameter)/rack and pinion type (medium and small diameter)