Stainless Steel 316 Marine Seawater Strainer/basket 1″/2″/3″ Sea Water Filter

Specification

TIANYU 316 Stainless Steel Marine Seawater Valves: Corrosion-Resistant Solutions for Harsh Ocean Environments

I. Product Overview

TIANYU’s marine seawater valve series, crafted from 316 stainless steel, is engineered specifically for marine environments, offering exceptional resistance to seawater corrosion. The product range includes gate valves, globe valves, check valves, and more, with nominal diameters spanning DN15 to DN300. These valves comply with international flange standards such as ANSI, DIN, and JIS, and can withstand working pressures up to 10 MPa. They are ideal for critical applications in ship ballast water systems, seawater cooling systems, fire protection systems, and other demanding marine scenarios.

II. Key Attribute Parameters

Structure & Specifications
- Nominal Diameter Range: DN15–DN300 (1/2″–12″)
- Connection Type: Flanged (ANSI B16.5, DIN 2501, JIS B2220)
- Valve Types: Gate valves, globe valves, check valves, ball valves, butterfly valves
- Material: Main body 316 stainless steel (molybdenum content 2–3%), sealing surfaces overlaid with Stellite alloy
Performance Parameters
- Working Pressure: 1.6 MPa–10 MPa (Class 150–Class 600)
- Temperature Range: -40°C–200°C
- Flow Coefficient: Cv value 10–1200 (water medium)
- Sealing Class: Complies with API 598 Class VI zero-leakage standard
Certifications
- Marine Classification Societies: DNV-GL, ABS, LR, BV, CCS, etc.
- Environmental Compliance: IMO MEPC.175(58) Ballast Water Convention
- Material Standards: ASTM A182, EN 10222

Product Overview

II. Key Attribute Parameters

Structure & Specifications
- Nominal Diameter Range: DN15–DN300 (1/2″–12″)
- Connection Type: Flanged (ANSI B16.5, DIN 2501, JIS B2220)
- Valve Types: Gate valves, globe valves, check valves, ball valves, butterfly valves
- Material: Main body 316 stainless steel (molybdenum content 2–3%), sealing surfaces overlaid with Stellite alloy
Performance Parameters
- Working Pressure: 1.6 MPa–10 MPa (Class 150–Class 600)
- Temperature Range: -40°C–200°C
- Flow Coefficient: Cv value 10–1200 (water medium)
- Sealing Class: Complies with API 598 Class VI zero-leakage standard
Certifications
- Marine Classification Societies: DNV-GL, ABS, LR, BV, CCS, etc.
- Environmental Compliance: IMO MEPC.175(58) Ballast Water Convention
- Material Standards: ASTM A182, EN 10222

III. Structural Design & Technical Features

Seawater Corrosion Resistance Design
- 316 stainless steel base with molybdenum content ≥2%, pitting resistance equivalent number (PREN) ≥40
- Sealing surfaces overlaid with 500-μm-thick Stellite 6 alloy, hardness HRC ≥40, resistant to erosion and wear
- Valve stems made of 2205 duplex stainless steel, yield strength ≥450 MPa, resistant to stress corrosion cracking
Anti-Marine Biofouling Technology
- Electropolished inner surfaces (Ra ≤0.4 μm) to minimize marine organism adhesion
- Optional sacrificial anode protection system (zinc alloy) with protection efficiency ≥95%
Low-Maintenance Structure
- Bonnet 采用 pressure self-tightening sealing design for enhanced sealing under increasing pressure
- Union bolt connections enable disassembly in ≤15 minutes (DN100 size)

IV. Manufacturing Process & Quality Control

Core Processes
- Forging Process:
  - Valve bodies forged with a forging ratio ≥3 and grain size ≥5
  - Solution treatment at 1050°C to eliminate residual stresses
- Precision Machining:
  - Valve seat sealing surfaces machined using 5-axis linkage technology with flatness ≤0.005 mm
  - Valve stem straightness ≤0.02 mm/m to ensure stable opening and closing torque
Quality Testing
- Non-Destructive Testing: UT ultrasonic testing (ASTM A388), MT magnetic particle testing (ASTM E709)
- Pressure Testing:
  - Shell test: 1.5 times rated pressure (5-minute hold)
  - Sealing test: 1.1 times rated pressure (bubble-tight sealing)
- Salt Spray Test: ASTM B117-16 standard, 1000 hours without corrosion

Valve Details

V. Core Product Advantages

Advantage Dimension	Technical Details & Application Value
Corrosion Resistance Lifespan	Annual corrosion rate ≤0.05 mm in 3.5% NaCl solution, designed service life ≥20 years, 5 times longer than carbon steel valves.
High-Pressure Resistance	Gate valves maintain sealing specific pressure ≥100 MPa at 10 MPa, ensuring safety in deep-sea applications (1000-meter water depth).
Rapid Response	Pneumatic actuator response time ≤0.5 seconds (DN100 size) for emergency shutdown requirements.
Total Cost of Ownership	Maintenance cycle ≥5 years, 40% lower total cost than cast iron valves and 25% lower than bronze valves.

Application

VI. Application Fields & Case Studies

Ship Ballast Water Systems
- Scenario: Ballast water inlet/outlet control for a 200,000 DWT oil tanker
- Configuration: DN250 electric butterfly valve, 316 stainless steel + EPDM seals
- Result: Resistant to chloride ions (Cl⁻ content ≥20,000 ppm), opening/closing torque ≤150 N·m
Offshore Platform Seawater Cooling Systems
- Scenario: Seawater cooling pipeline for an FPSO platform in the South China Sea
- Configuration: DN300 check valve, duplex stainless steel disc + Stellite sealing surface
- Advantage: Resistant to high-velocity seawater scouring (flow velocity ≥5 m/s), water hammer pressure ≤1.5 times working pressure
Offshore Wind Power Foundation Protection
- Scenario: Seawater flushing system for offshore wind turbine jacket legs
- Configuration: DN80 pneumatic globe valve with sacrificial anode protection
- Feature: 60% improvement in corrosion resistance in the splash zone (tidal range)

VII. Selection & Installation Guide

Key Selection Parameters
- Seawater Parameters: Salinity (typically 3.2–3.7%), temperature (-2°C–35°C), sediment content
- Installation Location: Above deck (UV protection required), bilge (explosion-proof required), ballast tanks (mud resistance required)
- Operation Mode: Manual (≤DN150), electric (DN150–DN300), pneumatic (emergency shutdown)
Installation Notes
- Use full-metal serrated gaskets (ASME B16.20) for flange connections with pre-tightening force deviation ≤±5%
- Install horizontally with the valve stem vertical to prevent Fluid accumulation at the stem
- For welded connections, use ER316L welding wire and perform stress relief treatment at 620°C for 2 hours after welding