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

Low-temperature electric double ball valve - Integrated flange cryogenic double cut-off intelligent isolation solution

Design concept

It combines the high structural rigidity of the integrated valve body with the engineering ease of use of flange connection and the strict isolation capability of double ball series double cut-off. The valve body adopts an integrated structure of integral casting or forging, without segmented middle flange or bolt connection, eliminating potential leakage points at the segmented parts of the valve body from the root. Two independent fixed balls are arranged in series along the flow direction in the same valve cavity, forming a double shut-off - discharge function. The two ends of the valve body are standard flanges, which are connected to the pipeline flanges. The extended valve cover extends beyond the insulation layer and is used in conjunction with a special cryogenic sealing pair and live load packing. The electric actuator is connected to the valve stem through a bracket and can be synchronously linked to double balls or independently controlled.

Performance advantage

· Integrated valve body with zero middle flange leakage: The integral cast/forged valve body has no segmented middle flanges or gaskets, completely eliminating the risk of middle flange leakage caused by deep cold shrinkage or pipeline stress. It has stronger structural rigidity and better resistance to bending moments.

· Double cut-off and double discharge: Two independent fixed balls are connected in series, and a relief valve is set in the middle cavity. The pressure can be released online to zero and the sealing performance of any ball valve can be verified to meet the API 6D DBB requirements. When there is internal leakage on one side, the other side can still ensure cut-off.

· Flange connection installation is convenient: The two ends of the valve body are standard flanges, which can be directly connected to the pipe flange without on-site welding. Installation and disassembly are convenient, significantly reducing the downtime for construction and maintenance.

· Independent bidirectional zero leakage: Each ball valve is supported by a fixed lug shaft. The medium pressure of the downstream valve seat is self-tightened, and the upstream valve seat spring is pre-tightened. API 598 zero bubble acceptance is adopted, and it can be reliably closed in both directions within the full pressure difference range.

· Cavity pressure classification protection: The upstream valve seat of each ball can automatically release abnormal pressure increase upstream. The middle cavity achieves controllable discharge through an external relief valve. Dual protection ensures the absolute safety of the integrated valve body and pipelines.

· Extremely low operating torque: The medium thrust is carried by the ear bearing, and the torque of a single ball is only 1/3 to 1/5 of that of a floating ball valve of the same specification. It can be matched with a smaller-sized electric actuator, reducing electrical equipment costs and energy consumption, and extending the service life of the electrical equipment.

· Intelligent electric and online diagnosis: The electric actuator integrates sensors such as valve position, torque, and operation frequency, supports bus control, and provides real-time feedback on the status of both balls, enabling remote shut-off, fault early warning, and predictive maintenance.

· Online emergency sealing: Each ball valve seat is equipped with a grease injection port. In case of accidental damage to the seal, emergency sealing grease can be injected online to temporarily cut off the seal, serving as the last resort before valve replacement.

Safety performance

· Double ball fireproof structure: Each ball valve is equipped with a primary soft seal and a secondary metal hard seal, in compliance with API 607/6FA. In case of fire, the double balls independently maintain the metal cut-off, providing a double fireproof isolation barrier.

· Anti-blowout valve stem: Both sets of valve stems adopt an inverted sealing step design, in compliance with API 608. Even when the gland is completely loose, the valve stem will not be blown out by the medium pressure, providing double safety redundancy.

· Extended valve cover anti-freezing: The neck of the valve cover extends beyond the insulation layer to ensure that the temperatures of both sets of stuffing boxes are above the freezing point, preventing freezing from causing operational jamming and leakage.

· Anti-static conduction: Each ball - valve stem - valve body is equipped with an independent static conduction path with a resistance of ≤10Ω. Dual conduction ensures operational safety.

· Multi-layer protection of cavity pressure: It is equipped with an upstream self-relief valve seat as the first internal protection, and an external relief valve connected to the middle cavity serves as the second controllable pressure relief port, which can also be used as an online isolation verification test port.

· Flange joint safety: Low-temperature fasteners and disc springs are used for anti-loosening. The sealing surface form can be selected as needed to ensure the reliability of flange sealing under long-term alternating working conditions.

· Electric intelligent safety: The electric actuator is equipped with torque overload, motor overheating, power phase loss protection and power-off position retention functions. It can be optionally equipped with a spring return fault safety mode, meeting SIL 2/3 and explosion-proof requirements. It supports emergency shutdown and dual-ball linkage/independent control logic.

Applicable working conditions

· Medium: LNG, liquid nitrogen/liquid oxygen/liquid argon, liquid ethylene/propylene, liquid ammonia, liquefied petroleum gas

· Scene: Double cut-off at the tank root of the LNG receiving station, emergency disengagement of the loading and unloading arm, isolation of the upstream and downstream of the metering skid, tank truck filling station, ship unloading arm, key cut-off point of the main line of the air separation unit

· Parameters: DN25 - DN400, Class 150-900, -196°C to +50°C

· Drive: Intelligent integrated electric actuator (dual output linkage or dual independent control), supporting buses such as Modbus/Profibus, non-intrusive setting and remote diagnosis