Flange Loose Gear Cryogenic Gate Valve Bevel Gear Operated Flat Gate Valve Cast Steel Gate Valves

Product Attribute: structure:Gate
application:General
place of origin:WENZHOU, China
power:Electric
customized support:OEM
temperature of media:-46°C to 150°C
brand name:TIANYU
Port size: DN50-DN600 (2″-24″)
Pressure Class: PN16/PN25/PN40
Connection: Flanged (ASME B16.5, GB/T 9113), RF face

INFO@TYFLUIDGROUP.COM

Specification

TIANYU Flanged Bevel Gear Cryogenic Gate Valve: Industrial Low-Temperature Fluid Control Solution

I. Product Overview

TIANYU flanged bevel gear cryogenic gate valves are engineered for low-temperature applications, featuring cast steel (WCB/LCB) bodies and bevel gear drives. With extended stems and thermal insulation, they resist cryogenic media erosion. Covering DN50-DN600 and PN16-PN40, these valves operate stably at -46°C to 150°C, ideal for LNG, liquid nitrogen, and oxygen cutoff control. Their bidirectional sealing meets API 6D, while bevel gear drives reduce operation torque by 70%, suitable for petrochemical, air separation, and cryogenic storage scenarios.

II. Core Technical Parameters

Nominal Diameter: DN50-DN600 (2″-24″)
Pressure Class: PN16/PN25/PN40 (1.6MPa/2.5MPa/4.0MPa)
Temperature Range: -46°C to 150°C (LCB steel down to -101°C)
Body Material: Cast steel WCB (normal temp), LCB (cryogenic), tensile strength ≥485MPa
Sealing System: Metal hard seal (STL overlay) + PTFE soft seal, leakage rate ≤0.1% (API 598)
Drive Type: Bevel gear manual drive (standard), optional electric/pneumatic actuators
Connection: Flanged (ASME B16.5, GB/T 9113), RF face
Protection Grade: IP65 (housing), anti-condensation design

Product Overview

III. Structural Design & Features

Cryogenic Optimization

Extended stem (protrusion ≥150mm) isolates cold media from operation mechanism, preventing frosting.
Fiberglass thermal gasket between bonnet and body reduces heat transfer by 60%, minimizing cold loss.

Bevel Gear Drive Benefits

2:1 gear ratio reduces DN300 valve torque from 280N·m to 85N·m, enabling single-hand operation.
Gearbox with lithium-based grease (-50°C to 120°C) extends maintenance cycle to 24 months.

Reliable Sealing

Double-eccentric gate-seat design self-laps sealing surfaces, compensating for ≤0.3mm wear.
V-type graphite packing + bellows dual sealing ensures zero leakage at 1.1x working pressure.

IV. Manufacturing & Quality Control

Cryogenic Material Treatment

Cast steel normalized at 920°C + tempered at 650°C, impact energy ≥27J at -40°C (Charpy V-notch).
STL6 overlay on seats aged at 500°C to eliminate stress, hardness HRC58-62.

Precision Machining

Lost foam casting for body, dimension tolerance ≤±0.8mm, surface roughness Ra≤12.5μm.
Bevel gears with ISO 8 class meshing, carburized and quenched (case depth 0.8-1.2mm).

Cryogenic Testing

Cryogenic treatment: -196°C liquid nitrogen immersion for 24h to detect intergranular corrosion.
Pressure cycling: 1,000 cycles at -46°C with no sealing degradation.

Valve Details

V. Core Advantages

Multi-Scenario Cryogenic Adaptability

LNG terminals: -162°C LNG cutoff, LCB + nickel-based seals meet API 6A.
Air separation: -196°C LOX lines, anti-static design (ground resistance ≤10Ω) prevents sparks.
Chemical cryogenic pipes: -46°C ethylene, erosion-resistant seals last 3x longer than standard valves.

Full-Life Cost Optimization

Replaceable seat design reduces on-site maintenance costs by 50%.
Gearbox maintenance-free design saves $800/year per DN200 valve.

Global Certification Support

CE/PED 2014/68/EU certified, registered for GOST R.
Provides API 6D, ISO 5208 test reports, supports third-party inspection.

Application

VI. Applications & Cases

LNG storage project: DN400 PN40 valve in BOG line operated leak-free for 4 years at -162°C, torque stable at 120N·m.
Air separation unit: DN150 valve controls liquid argon, extended stem keeps operation layer at 23°C.
Chemical ethylene plant: DN250 valve at -101°C shows 0.1mm/year seat wear, > industry average.

VII. Customization Options

Material Upgrades

Ultra-cryogenic: 304L SS (-196°C), Monel 400 (-253°C).
H2S-resistant: NACE MR0175 certified materials (e.g., 13Cr steel).

Functional Enhancements

Fire-safe design: Complies with API 6FA, maintains sealing for 30min during fires.
Remote monitoring: Adds valve position transmitter (4-20mA) and explosion-proof limit switches.

Special Interfaces

Butt-weld (BW): ASME B16.25 for high-pressure cryogenic pipes.
Vacuum insulation: Multi-layer insulation blankets, cold loss ≤0.5W/m.

VIII. Installation & Maintenance

Cryogenic installation: Install vertically, use low-temp alloy bolts (e.g., 35CrMoA), torque per ASME PCC-1.
Routine maintenance: Check gearbox oil level every 6 months, use silicone grease below -40°C.
Troubleshooting: Cold leaks often at packing, adjust gland bolts (torque increase ≤15%) online.