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

Cast steel ear shaft installed ball valve - a reliable low-torque isolation solution for large-diameter medium and high-pressure pipelines

Design concept

The complex flow channel valve body is formed by casting process, and the ball is rigidly fixed at the center of the valve body with the ear shaft, forming a fixed ball structure. The medium thrust is directly introduced into the valve body through the upper and lower ear shafts, and the sealing surface only bears a controllable spring preload force. Design logic: The large-diameter economy is achieved through the near-final shape manufacturing of cast steel. The high-pressure thrust is dissipated and the operating torque is reduced by the ear shaft support. The bidirectional sealing and cavity pressure self-relief are realized by the piston effect valve seat. It provides a standard isolation valve with long service life and low maintenance for medium and high-pressure pipelines with a diameter of DN150 and above.

Performance advantage

Low operating torque: The medium thrust is carried by the ear bearing, and the valve seat load is controllable. 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 zero leakage: The downstream valve seat is self-tightened by the medium pressure, and the upstream valve seat is pre-tightened by the spring, meeting the API 598 zero bubble acceptance, and reliably closing in both directions from low pressure to full pressure.

Intrinsic safety of cavity pressure self-release: The upstream valve seat can automatically slightly open to release the abnormal high pressure generated in the middle cavity due to temperature rise into the upstream pipeline, without the need for an external safety valve.

Uniform sealing wear: The ball is precisely centered and limited by the ear shaft, eliminating eccentric wear. The wear rate of the upstream and downstream valve seats is consistent, and the sealing life is multiplied.

Full bore 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, meeting the requirements for internal pipeline detection and efficient medium transportation.

Economic efficiency of large-diameter cast steel: The valve body is cast in one piece, with high material utilization rate. For DN200 and above, the cost is superior to the forged steel solution.

Structural damping and vibration reduction: The inherent damping characteristics of the casting structure can absorb pipeline vibration and thermal shock, making it suitable for pulsating working conditions such as compressor outlets.

Safety performance

Fireproof structure: Standard equipped with primary non-metallic seal + secondary graphite/metal seal, certified by API 607/6FA fire test.

Anti-blowout valve stem: The reverse sealing step design meets the mandatory requirements of API 608. 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, eliminating the risk of static electricity accumulation.

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.

Casting density guarantee: 100% radiographic testing is conducted on pressure-bearing castings to eliminate volume defects such as shrinkage porosity and gas holes, ensuring the integrity of the pressure boundary.

Applicable working conditions

Medium: crude oil, refined oil products, natural gas, water, steam, hydrocarbons, chemical solvents, media containing solid particles

Scene: Inlet and outlet cut-off of long-distance pipeline network stations, main process pipelines in refining and chemical industry, high-pressure water supply and steam in power plants, offshore platforms,slurry transportation