corrosion resistant check valve Description
Corrosion-resistant check valve is a valve designed for corrosive media delivery system, through special materials and sealing technology to achieve one-way flow control, prevent backflow damage to pipelines, pumps and other equipment. Its core functions include:
Block corrosive media backflow, protect equipment from chemical erosion;
Maintain stable sealing in high temperature, high pressure or acid and alkali environment.
Key design and technical features
1. Core material
| Type of material | characterisation | Adaptation Scenarios |
|---|---|---|
| Stainless Steel (316L/Duplex) | Resistant to acid, alkali and chloride ion corrosion, high mechanical strength | Chemical, petroleum, desalination |
| Titanium alloys/nickel-based alloys | Resistant to acid and alkali, chloride ion corrosion, high mechanical strength resistant to strong oxidising media (e.g. aqua regia, concentrated sulphuric acid) | Highly corrosive industrial processes |
| Plastic (PTFE/PP) | Lightweight, resistant to non-oxidising acids and organic solvents | Low pressure, room temperature corrosive media |
2. Sealing technology
Hard seal structure: valve flap and seat are coated with surfaced carbide or ceramic coating, resistant to particle abrasion and chemical corrosion;
Elastic sealing ring: embedded with fluorine rubber (FKM) or PTFE to enhance the sealing fit under low-pressure working conditions.
3. Structural design
Clamping or flange connection, compact design for narrow space;
Axial or rotary valve, reduce flow resistance, reduce pressure drop (such as DN15-DN1200 diameter applicable).
corrosion resistant check valve
Selection and Maintenance Recommendations
Selection points:
Medium matching: according to the medium corrosive strength of stainless steel, titanium alloy or plastic materials;
Condition matching: high temperature and high pressure scenarios preferred metal hard seal, room temperature and low pressure can choose elastic seal;
Installation direction: horizontal or vertical pipelines need to ensure that the valve gravity and media flow direction.
Maintenance requirements:
Regularly check the sealing surface wear, to avoid long-term retention of particles leading to seal failure;
Acidic media environment is recommended to replace the elastic seal every 2 years.
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