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

High-pressure large-diameter fixed ball valve - low-torque long-life isolation solution for pipelines under extreme working conditions

Design concept

The high-rigidity valve body bears ultra-high pressure. The ball is fixed and supported by the ear shaft, which directly introduces the medium thrust into the valve body through the ear shaft instead of pressing it towards the downstream valve seat. The operating torque is basically decoupled from the medium pressure, and the sealing surface only bears the controllable spring preload force. Core logic: Utilizing a fixed ball structure to counteract large-diameter high-pressure thrust and achieve low-torque operation. The precise centering of the ear shaft ensures uniform wear of the sealing surface, providing standardized isolation components that are easy to operate and have a balanced sealing life for high-pressure large-diameter pipelines of Class 600 and above and DN200 and above.

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. The specification of the actuator is significantly reduced, and the complete set cost is significantly lowered.

· 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.

· High-pressure structural integrity: The wall thickness and reinforcing ribs are designed for the most demanding working conditions. The valve body has strong overall rigidity and remains stable for a long time under high-pressure alternating and fatigue loads.

· 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 metallic 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, ensuring that the valve stem is not blown out by the medium pressure when the cover is loosened.

· 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

· Media: natural gas, crude oil, refined oil products, high-pressure water, steam, hydrocarbons, sulfur-containing media, solid particle-containing media

· Scenarios: Entry and exit of long-distance pipeline stations, safety shut-off at wellheads, high-pressure piping systems on offshore platforms, hydrogenation units, high-pressure water injection systems, and ultra-high-pressure process pipelines

· Drive: worm gear, pneumatic, electric, hydraulic