The three piece forged steel ball valve is widely used in industrial fields with strict performance requirements for valves due to its split structure, high-strength material, sealing reliability, and extreme working condition resistance. Starting from the core advantages, classify and explain its typical application scenarios and key selection criteria:

1、 High pressure and high temperature working conditions

1. Oil and gas transportation

High pressure pipeline: Used for long-distance crude oil and natural gas pipelines of Class 600~2500LB (PN100~PN420), it needs to pass API 6D certification and withstand pipeline pressure fluctuations.

High temperature refining: In catalytic cracking and hydrocracking units, valves need to withstand high temperatures above 425 ℃. The valve body material is upgraded to F316L or Inconel 625, and the valve seat is coated with tungsten carbide hard alloy.

Deep sea mining: The valve body needs to pass a -46 ℃ low-temperature impact test, with a double block plug design to prevent seawater corrosion, and a metal sealing structure to cope with high-pressure deep sea environments.

2. Energy generation

Supercritical thermal power: The main steam pipeline valve needs to withstand a high temperature of 540 ℃ and a high pressure of 25MPa. The valve seat seal adopts a graphite+metal composite structure to prevent high-temperature creep leakage.

Nuclear power system: The valve body material is made of A105N forged steel (with high radiation stability), and the actuator is equipped with anti jamming design to ensure the safety of the reactor coolant system (RCS).

2、 Strong corrosion and hazardous medium working conditions

1. Chemical and Fine Chemicals

Strong acid-base medium: In the chlor alkali industry, the valve body is made of Hastelloy C-276 or Monel 400, and the valve seat is sealed with PTFE+graphite filling structure, which is resistant to corrosion by concentrated hydrochloric acid and concentrated sulfuric acid.

Toxic and harmful media: When used for highly toxic media such as phosgene (COCl ₂) and hydrogen cyanide, valves must pass ISO 15848-1 micro leak certification, and actuators must be equipped with dual solenoid valves to achieve emergency shut-off.

Multiphase flow control: In the transportation of coal water slurry in coal chemical industry, the valve body is sprayed with chromium carbide coating (hardness HRC65), and the spherical channel is designed with anti blocking structure to avoid particle medium blockage.

2. Liquefied natural gas (LNG) industry

Low temperature storage and transportation: The valve body material is A352-LCB low-temperature steel, and the long neck valve cover design reduces cold conduction. The packing material is a combination of flexible graphite and PTFE, suitable for ultra-low temperatures of -196 ℃.

BOG (evaporated gas) recovery: using pneumatic actuators and double acting locators to achieve rapid opening and closing (≤ 3 seconds), reducing LNG evaporation losses.

3、 Strict environment and safety critical areas

1. Ocean Engineering

FPSO (Floating Production Storage and Offloading Unit): Valves must be certified by NORSOK M-650, and the valve stem surface must be nickel plated with phosphorus alloy to prevent seawater corrosion. The actuator is equipped with redundant power supply to ensure continuous operation.

Polar oil and gas development: An electric heat tracing strip is added to the exterior of the valve body, and anti freezing lubricating grease is injected into the internal packing chamber to prevent component freezing in extremely cold environments of -50 ℃.

2. Dangerous Chemicals and Military Industry

Flammable and explosive media: When used in ethylene cracking units, the grounding resistance of the valve body is ≤ 1 Ω, and the valve stem is connected to the ball through a conductive pin to avoid static electricity causing explosions.

Military grade application: The valve body surface is galvanized with nickel alloy (neutral salt spray test ≥ 1000 hours), and the actuator adopts explosion-proof certification (Ex d IIC T6), meeting the reliability requirements of the battlefield environment.

4、 Convenience requirements for maintenance and repair

1. Frequent maintenance scenarios

Refining catalytic unit: The valve seat sealing ring needs to be replaced online every 3 months, and the three piece structure can be maintained without disassembling the pipeline, reducing the single maintenance time by 60%.

Polycrystalline silicon production: In the outlet of the hydrogenation reactor (including silicon powder medium), the valve seat can be replaced directly after wear, avoiding overall scrap and reducing operation and maintenance costs by 40%.

2. Restricted space area

Offshore drilling platform: Modular design allows for single-sided disassembly in narrow compartments without the need for lifting equipment, adapting to platform vibration (10g acceleration) and tilt (± 15 °) conditions.

Underground gas storage: Valves are horizontally installed in narrow shafts, and the three piece structure facilitates the removal of the middle body from the manhole for maintenance, reducing excavation workload.

Summary: The core value of three piece forged steel ball valves

1. Structural advantages: Split design reduces maintenance costs (30%~50% lower than integral valves) and extends equipment lifespan to over 20 years.

2. Performance limit: Covering a temperature range of -196 ℃~540 ℃, with a maximum pressure rating of PN420, suitable for over 90% of industrial media.

3. Safety redundancy: The design of fire prevention, anti-static, and anti spray meets international standards such as API 6FA and ISO 15848, reducing the risk of accidents.

Selection suggestion: Prioritize determining the model based on the corrosiveness of the medium (acid and alkali resistance level), pressure and temperature (API 6D/6FA certification), and execution mode (electric/pneumatic/hydraulic).