Email: sales@kelorvalves.com
Phone: +91 93135 43530
Address: 133/1 Ground, Mansuri Block, Opp. Dudheshwar Water Tank, Ahmedabad-380004, Gujarat, India
Marine-Grade SS316 Check Valves for Desalination & Chemical Plants
Krishna Industries (KELOR) engineers premium marine-grade SS316 (CF8M) dual plate check valves specifically for highly corrosive environments. Featuring molybdenum-enhanced corrosion resistance, crevice-free design, and aggressive-media seating (PTFE/Viton). Ideal for SWRO/BWRO desalination, chemical processing, offshore platforms, and power plant cooling systems. Supplied with full MTC, API 598 test reports, and export-ready packaging.
Quick answer: Standard stainless steel fails in chloride-rich environments. KELOR’s marine-grade SS316 (CF8M) check valves contain 2–3% molybdenum, providing critical resistance to pitting and crevice corrosion in seawater, desalination, and chemical processing. Supplied with EN 10204 3.1 MTC, API 598 certification, and optional NACE MR0175 compliance. Contact sales@kelorvalves.com for project specifications.
Technical Quick Reference
Body & Disc MaterialSS316 / CF8M (Molybdenum-enhanced)
Seat OptionsPTFE, Viton (FKM), Metal-Seated
Size RangeDN50 (2″) to DN600 (24″)
Pressure RatingPN10 / PN16 / Class 150 / Class 300
End ConnectionWafer Type (standard) / Lug Type (pump discharge)
Design StandardAPI 594 / ASME B16.34 / ISO 5752 Series 19
Corrosion StandardNACE MR0175 / ISO 15156 (on request)
HSN Code84813000
On This Page
Why SS316 Molybdenum Content is Critical for Marine Applications
In marine, desalination, and chemical processing environments, chloride-induced pitting and crevice corrosion are the primary causes of premature valve failure. Standard SS304 (CF8) lacks the alloying elements necessary to withstand these conditions.
SS316 (CF8M) incorporates 2–3% molybdenum, which fundamentally alters the passive oxide layer on the steel surface, dramatically increasing its resistance to chloride attack. For EPC contractors and plant engineers, specifying SS316 (CF8M) is not an upgrade—it is a mandatory baseline for reliability in seawater intake, reverse osmosis (RO) brine lines, and aggressive chemical dosing systems.
Engineering Specification Tip
For sour service environments (H₂S presence) or extreme offshore chemical exposure, explicitly specify NACE MR0175 / ISO 15156 compliance in your purchase order. KELOR can supply SS316 (CF8M) valves with certified NACE-compliant metallurgy and hardness testing to ensure safe operation in sour gas and highly corrosive chemical plants.
Desalination & Chemical Processing Applications
Seawater Reverse Osmosis (SWRO)
High-pressure pump discharge and brine reject lines. SS316 (CF8M) with Viton or PTFE seats prevents chloride pitting and ensures zero backflow, protecting expensive RO membranes and high-pressure pumps.
Chemical Processing & GIDC Estates
Acid, alkali, and solvent transfer lines in chemical hubs (Ankleshwar, Vapi, Dahej). PTFE-seated SS316 check valves provide universal chemical resistance and prevent hazardous backflow in critical process loops.
Offshore & Marine Platforms
Firewater systems, seawater cooling loops, and ballast systems. Compact wafer design saves critical space and weight on offshore platforms, while SS316 resists constant saltwater aerosol exposure.
Thermal & Nuclear Power Cooling
Condenser cooling water circulation and auxiliary chemical dosing. Lug-type configurations allow safe isolation of cooling pumps for maintenance without draining the entire seawater intake system.
Seat Material Selection for Aggressive Media
In corrosive environments, the seat material is as critical as the metal body. An incompatible elastomer will swell, harden, or degrade, leading to catastrophic leakage.
| Seat Material | Chemical Resistance Profile | Optimal Application | Max Temperature |
|---|---|---|---|
| PTFE (Teflon) | Universal. Resists virtually all acids, alkalis, solvents, and oxidizers. | Aggressive chemical dosing, RO brine lines, high-purity processes. | 180°C |
| Viton (FKM) | Excellent resistance to hot seawater, hydrocarbons, oils, and strong acids. | Offshore seawater cooling, chemical plant hydrocarbon service, steam. | 200°C |
| Metal-Seated (SS316) | Absolute chemical immunity. No elastomer degradation possible. | Extreme high-temperature processes, abrasive slurries, fire-safe applications. | 450°C+ |
Technical Specifications & Dimensions
| Parameter | Specification |
|---|---|
| Valve Type | Dual Plate Wafer / Lug Check Valve (Non-Return Valve) |
| Design Standard | API 594 / ASME B16.34 |
| Size Range | DN50 (2 inch) to DN600 (24 inch) |
| Pressure Rating | PN10 / PN16 / Class 150 / Class 300 (on request) |
| Body & Disc Material | SS316 / CF8M (ASTM A351) |
| Spring Material | SS316 (Inconel spring options available for extreme service) |
| Face-to-Face | ISO 5752 Series 19 / MSS SP-144 (Ultra-compact) |
| Testing & Inspection | API 598 (Shell & Seat Leakage), NACE MR0175 (on request) |
| Flow Direction | Bi-directional flow prevention (arrow cast on body for installation) |
Why EPC Contractors Specify KELOR for Marine Projects
Metallurgical Traceability
Every valve is supplied with EN 10204 3.1 Material Test Certificates (MTC), ensuring the CF8M chemistry (including verified molybdenum content) meets strict marine project QA/QC requirements.
NACE & API Compliance
Manufactured and tested under ISO 9001:2015 quality systems. Full API 598 hydrostatic test reports provided. NACE MR0175 compliance available for sour service chemical and offshore applications.
Export-Ready Packaging
Valves are cleaned, passivated, and sealed in moisture-resistant, fumigated wooden crates with silica gel, ensuring zero corrosion during sea freight or long-term site storage.
Dedicated Chemical/Marine Support
Our technical team understands the nuances of SWRO, chemical dosing, and offshore specs. We help verify seat compatibility and pressure ratings before you place the order.
Pricing, Lead Time & Documentation
Order & Supply Framework
Minimum Order Quantity10 Nos per size per configuration
Standard Lead Time7–12 working days (DN50–DN200)
Large Bore / NACE Lead Time15–21 working days (DN250–DN600)
InvoicingGST invoice with E-Way bill (GSTIN: 24AKLPP6499B1ZT)
Quality DocumentationMTC (EN 10204 3.1), API 598 Test Report, PMI Report (on request)
Third-Party InspectionTUV / Bureau Veritas / Lloyd’s Register coordination available
HSN Code84813000
Secure Your Pipeline with Marine-Grade Reliability
Do not risk chloride corrosion with inferior materials. Share your P&ID requirements, size list, and seat preference. Our technical sales team will respond within 2 hours with a compliant, competitive proposal.
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Frequently Asked Questions
Material & Corrosion Resistance
1. Why is SS316 (CF8M) required for desalination and chemical plants?
SS316 (CF8M) contains 2-3% molybdenum, which provides exceptional resistance to pitting and crevice corrosion caused by chlorides, seawater, and aggressive chemical processes. Standard SS304 lacks this protection and will rapidly degrade in marine or high-chloride environments.
2. Are your marine-grade check valves NACE MR0175 compliant?
Yes. Our SS316 (CF8M) check valves can be supplied with NACE MR0175 / ISO 15156 compliant materials and certifications upon request, making them suitable for sour service and highly corrosive offshore oil, gas, and chemical applications.
Seat Materials & Configuration
3. What seat materials are available for aggressive chemical service?
For aggressive chemical and marine environments, we recommend PTFE (Teflon) or Viton (FKM) seats. PTFE offers universal chemical resistance up to 180°C, while Viton provides excellent resistance to hot seawater, hydrocarbons, and aggressive acids.
4. Do you supply lug type check valves for pump discharge?
Yes. While wafer type is standard for in-line service, we supply lug type dual plate check valves specifically for pump discharge applications, allowing independent isolation and maintenance of the pump without disturbing the downstream pipeline.
Ordering & Delivery
5. What is the lead time and MOQ for marine-grade SS316 valves?
The Minimum Order Quantity (MOQ) is 10 Nos per size. Standard SS316 wafer check valves (DN50–DN200) dispatch within 7–12 working days. Larger sizes (DN250–DN600) or custom NACE-certified configurations require 15–21 working days. Pan India and export-ready packaging is available.
Engineered for Corrosive Environments
Protect your critical infrastructure with certified, traceable, and rigorously tested marine-grade valves.
- SS316 (CF8M) Molybdenum-Enhanced
- PTFE / Viton Aggressive Media Seats
- EN 10204 3.1 MTC & API 598 Certified
- NACE MR0175 Compliance Available
- Export-Grade Moisture-Sealed Packaging