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 floating ball valve - A simple self-tightening sealing solution for medium and small diameters in cryogenic conditions

Design concept

The pressure-bearing shell is made of ASTM low-temperature carbon steel or austenitic stainless steel forgings/castings. The ball is not equipped with a fixed ear shaft. After closing, the medium pressure pushes it towards the downstream valve seat, and the sealing force automatically increases with the pressure difference. The extended valve cover is used to keep the stuffing box away from the cold source, and the entire structure is preset with deep cold shrinkage compensation. Core logic: Achieve bidirectional reliable sealing with the simplest floating structure, and handle cryogenic environments ranging from -46°C to -196°C with low-temperature materials and an extended valve cover. Provide a standard isolation component with a simple structure and low cost for cryogenic branch pipelines, instrument isolation and sampling systems with a diameter of DN150 or less.

Performance advantage

· Pressure self-tightening seal: When closed, the thrust of the medium pushes the ball downstream towards the valve seat. The sealing specific pressure automatically increases with the pressure difference, and the seal is more reliable under high pressure difference.

· Bidirectional zero leakage: Symmetrical structure, meeting API 598 high-pressure gas seal zero bubble acceptance, reliable bidirectional off from low pressure to full pressure.

· Excellent low-pressure sealing: The elastic sealing ring or pre-tightening spring on the back of the valve seat provides the initial sealing force, enabling airtight shut-off even under extremely low pressure differences.

· Full bore zero pressure loss: The ball hole is the same as the inner diameter of the pipe, with nearly zero flow resistance, allowing it to pass through the pigging machine.

· Minimalist structure: No ear shafts, bearings or complex piston valve seats. The number of components is approximately 60% of that of fixed balls of the same diameter, making maintenance simple and convenient.

· Small in size and light in weight: Compact surface to surface. For DN50 and below, a single handle can quickly open and close 90° without the need for an actuator.

Safety performance

· Anti-blowout valve stem: The valve stem is installed from the inside of the valve body, with an inverted sealing step at the bottom. Even when the cover is completely loosened, the valve stem will not be blown out by the medium pressure, meeting the mandatory requirements of API 608.

· Extended valve cover insulation: The neck of the valve cover extends beyond the insulation layer to ensure that the temperature of the stuffing box is above the freezing point. Combined with the live load disc spring for continuous compensation, it prevents freezing cracking and dissipation.

· Anti-static conduction: The resistance between the ball, valve stem and valve body is ≤10Ω, promptly conducting away the static electricity generated by the flow of cryogenic medium.

· Fireproof structure optional: Configurable primary non-metallic seal + graphite secondary seal, certified by API 607/6FA.

Note on the pressure in the middle cavity: The reheating and expansion of the liquid trapped in the middle cavity of the floating ball may cause abnormal pressure increase. It is recommended that in situations prone to temperature rise, a ball with a pressure relief hole or an additional middle cavity discharge valve be selected.

Applicable working conditions

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

· Scenarios: Sampling and instrument pipelines for air separation units, loading and unloading branch pipes for LNG tankers, instrument valves for cryogenic storage tanks, cryogenic pipelines in laboratories, and small-scale cryogenic filling systems

· Drive: Handle, pneumatic (spring return), electric (special for cryogenic)

· Selection boundary: For high-pressure large diameters above DN150 or Class 600, it is recommended to upgrade to a low-temperature fixed ball valve