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

Pneumatic fully welded ball valve

Design concept

Integrate the zero leakage and maintenance-free features of the fully welded valve body with the fail-safe quick-action capability of the pneumatic actuator into one. The valve body is made of forged steel or steel plates rolled and welded as a whole, without any valve body flanges or gaskets. The actuator is standard-equipped with a single-acting spring return function, which automatically shuts off when gas or power is cut off. Design logic: With a fully welded structure, it physically eliminates leakage and uses pneumatic spring reset to achieve intrinsically safe emergency shut-off, providing an excellent maintenance-free solution for ESD nodes of buried, underwater, and extremely cold pipelines that are inaccessible.

Performance advantage

Zero leakage valve body: Fully welded and closed structure, no valve body connection parts, meeting ISO 15848 grade, eliminating external leakage of the valve body.

Fail-safe reset: Single-acting cylinder spring reset, automatically returns to a safe position when gas is lost or power is cut off, naturally meeting the ESD emergency cut-off requirements.

Rapid opening and closing: The full stroke time can reach the 1-second level, making it the preferred drive for emergency quick-closing conditions.

Intrinsic explosion-proof safety: Powered by compressed air, with no electrical sparks, it is directly applicable to explosion-proof areas in petrochemicals.

Extremely low operating torque: The internal structure is a fixed ball ear shaft support structure. The medium thrust is carried by the ear bearing. The actuator is small in size and low in cost.

Bidirectional zero leakage: Meets API 598 zero bubble acceptance, fixed ball bidirectional spring pre-tightening + medium self-tightening, reliable off throughout the full pressure range.

Cavity pressure self-relief: The upstream valve seat automatically releases the abnormal pressure rise in the middle cavity to the upstream, ensuring the safety of the fully welded and sealed cavity.

High structural rigidity: The forged and welded integral valve body can withstand the combined bending and tensile loads of the pipeline and can be directly buried underground without the need for fixed supports.

Safety performance

Fail-safe: Spring return actuator, the valve automatically closes/opens when the gas source/power supply is interrupted, meeting the SIL 2/3 loop requirements.

Fireproof structure: Primary non-metallic seal + secondary metallic seal, API 607/6FA certified.

Anti-blowout valve stem: Reverse sealing step, meeting API 608, the valve stem will not be blown out when the cover loosens.

Anti-static conduction: The resistance of the ball - valve stem - valve body is ≤10Ω.

Cavity pressure self-relief protection: Built-in self-relief valve seat to prevent pressure build-up in the fully welded sealed cavity.

Fully welded with zero leakage: No valve body flange gasket, zero leakage of the body, and maintenance-free for life.

Emergency sealing grease injection: A grease injection port is reserved for the valve seat, and sealing grease is injected online as a remedial measure before scrapping.

Applicable working conditions

Medium: natural gas, LNG, crude oil, refined oil products, cryogenic hydrocarbons, liquid ammonia

Scene: ESD cut-off of buried trunk lines for long-distance pipelines, submarine pipelines, unmanned stations in extremely cold conditions, and the outlet of storage tanks at LNG receiving stations