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 and hydraulic fully welded ball valve

Design concept

The forged steel fully welded valve body and the pneumatic-hydraulic linkage actuator are integrated into one unit. The fully welded structure eliminates the valve body flange and external leakage channels. Gas-liquid linkage drive uses high-pressure gas in pipelines as the power source, stores energy in accumulators, and can provide large thrust without external power supply in emergency situations, achieving fail-safe operation. The fixed ball structure transmits the medium thrust to the bearing, featuring low torque and reliable sealing, meeting the full life cycle service requirements of buried and above-ground high-pressure pipelines.

Performance advantage

Pneumic-hydraulic linkage drive - Powered by pipeline air pressure, the hydraulic actuator outputs a stable and large thrust, completely independent of external power supply

Fully welded with zero external leakage - The valve body has no flange interface, eliminating gasket leakage from the source, suitable for buried and long-term maintenance-free pipelines

Fixed ball low torque - The upper and lower axes of the ball support the torque, which is not greatly affected by pressure fluctuations, and can be equipped with smaller-sized actuators

Emergency shutdown - Automatic fail-safe action in case of undervoltage, ESD signal or fire, completing the cut-off within seconds

Bidirectional sealing - double-piston effect valve seat, low-pressure spring pre-tightening, high-pressure medium self-tightening, full pressure difference tight shut-off

Self-pressure relief in the valve cavity - When abnormal pressure rises inside the cavity, the valve seat is released to the pipeline side to prevent excessive stress in the valve body

Full bore and low flow resistance - The flow channel is consistent with the inner diameter of the pipe, allowing it to pass through the pigging device with a small pressure drop

Safety and reliability

Fireproof - Graphite fireproof ring, high-temperature sealing, compliant with API 6FA

Anti-blow-out and anti-static - The valve stem is equipped with an anti-blow-out step and double packing. The conductive spring connects the ball - valve stem - valve body

Direct burial durability - Multi-layer anti-corrosion coating, compatible with cathodic protection, and moisture-proof sealing for actuators and extension rods

Application scenarios

Emergency shutdowns of long-distance natural gas pipeline trunk lines, pigging stations, underground gas storage facilities, LNG receiving stations, gas transmission and distribution valve stations, refining and chemical tank farms, and high-pressure isolation on offshore platforms