3.1 Chlor-Alkali Chemical Industry

Valve requirements: fluorine-lined butterfly valve, fluorine-lined ball valve, titanium globe valve.

Technical challenges: resistance to pitting corrosion caused by wet chlorine gas, resistance to strong oxidizing properties of hypochlorite, and prevention of vacuum deformation.

Typical applications: chlorine gas pipeline at the outlet of electrolytic cells, regulation of dechlorination towers, and shut-off of hydrochloric acid synthesis furnaces.

3.2 Polysilicon and photovoltaic materials

Valve requirements: bellows-sealed globe valve, high-purity ball valve, ultra-pure PFA-lined valve.

Technical challenges: trichlorosilane (TCS) is flammable and explosive when exposed to water, requires zero external leakage, and poses a challenge due to particulate matter washout.

Typical applications: feeding of cold hydrogenation reactors, recovery of tail gas from reduction furnaces, and side-line adjustment of distillation columns.

3.3 Caprolactam and new nylon materials

Valve requirements: Jacket valve (steam tracing), knife gate valve, self-cleaning regulating valve.

Technical challenges: easy crystallization (crystallization occurs when the temperature is below 80℃), blockage by particulate matter, and frequent cleaning requirements.

Typical applications: crystallizer discharge, centrifuge feeding, dryer hot gas cutoff.

3.4 Coal Chemical Industry (Coal-to-Olefins/Coal-to-Oil)

Valve requirements: lock hopper valve (ball valve), wear-resistant angle valve, black water regulating valve.

Technical challenges: wear from high-hardness ash (containing SiO₂, Al₂O₃), gas-liquid-solid three-phase flow, and flash corrosion.

Typical applications: gasifier slag removal system, scrubber black water circulation, shift converter temperature regulation.