PN16 Wafer Type Metal Seated Check Valve Stainless Steel 304 316 Manual Check Valve

Product Attribute: Port Size:standard
structure:Check
application:General
place of origin: China
power:Manual
customized support:OEM
temperature of media:Normal Temperature
brand name:tianyu
media:Water
Standard:National Standard
Teemperature:Normal
Connection Form:Wafer Type
Media:Water, gas, oil, etc
Valve Body Material:CF8/CF8M
Drive Mode:Manual
Valve Seat Material:CF8/CF8M
Temperature:-196 C-600 C
Pressure level:PN16

INFO@TYFLUIDGROUP.COM

Specification

TIANYU Wafer-Type Metal-Seated Check Valve: Precision Backflow Prevention for Industrial Pipelines

I. Product Overview

TIANYU wafer-type metal-seated check valves are constructed from 304/316 stainless steel (CF8/CF8M), designed to GB/T 12236 and API 594 standards. Installed between flanges via a wafer-style design, they cover DN50-DN300 (2″-12″) with PN16 (1.6MPa) pressure rating and -196℃~600℃ temperature range. Suitable for water, steam, oil, and corrosive media, these valves use a rotating disc for automatic backflow prevention in harsh industrial applications like petrochemical, nuclear, and LNG sectors.

II. Core Technical Parameters

Specifications & Pressure-Temperature Range
- Nominal Diameter: DN50/80/100/150/200/250/300 (2″-12″)
- Pressure Class: PN16 (shell test pressure 2.4MPa, sealing test pressure 1.76MPa)
- Temperature Range: -196℃~230℃ (304 SS), -101℃~600℃ (316 SS)
Materials & Sealing System
- Body/Disc: 304 stainless steel (ASTM A351 CF8), 316 stainless steel (ASTM A351 CF8M)
- Sealing Pair: Metal-to-metal seal (surface roughness Ra≤0.8μm), leakage rate ≤1×10⁻⁶cc/s (API 598)
- Connection: Wafer type (fits ANSI B16.5/GB/T 9113 flanges)
- Pin Shaft: 2Cr13 stainless steel (HRC35+), erosion-resistant
Mechanical Performance
- Opening Pressure: ≤0.02MPa (forward flow resistance)
- Closure Response Time: ≤0.3s (triggered by backflow)
- Fatigue Life: 100,000 cycles without seal failure (GB/T 13932)

Product Overview

III. Structural Design & Technical Features

Butterfly Check Mechanism
- Disc rotates around a horizontal pin with streamlined flow path, pressure drop 30% lower than lift checks (DN100 loss ≤0.08MPa).
- Single/double-disc design: Double discs for large sizes disperse medium impact, preventing water hammer.
Metal Seal Optimization
- Disc-seat conical fit (3°-5° angle) self-tightens via medium pressure, specific pressure ≥20MPa.
- Seal surfaces precision-lapped by 5-axis grinder to flatness ≤0.01mm, red lead test contact rate ≥90%.
Extreme Condition Adaptability
- Cryogenic design: Long-neck pin prevents freezing at -196℃, disc reset time ≤0.5s.
- High-temperature: 316 SS solution-treated for 50% better oxidation resistance at 600℃ vs. 304.

IV. Manufacturing Processes & Quality Control

Precision Casting Flow
- Investment casting process, blank tolerance ≤±0.3mm, 100% ultrasonic testing (UT) for internal defects.
- SS parts solution-treated at 1050℃, grain size ≥Grade 5, passing ASTM A262 E-method intergranular corrosion test.
Surface Treatment Technology
- Seal surfaces plasma-overlaid with STL alloy (≥1.5mm thickness, HRC58-62), erosion life >8 years.
- Body electropolished (Ra≤0.4μm), passivated for salt spray test ≥1000 hours.
3D Quality Inspection
- Hydrostatic test: 1.5x pressure (30min hold), 1.1x sealing pressure—zero leakage.
- Spectral analysis: Element deviation ≤0.03% per heat, traceable to heat number.
- SIL certification: Meets IEC 61508, achieves SIL 2 functional safety.

Valve Details

V. Core Product Advantages

Multi-Medium Compatibility
- Petrochemical: 316 SS resists H₂S (≤200ppm) and organic acids for FCC unit rich gas lines.
- LNG: -196℃ cryogenic seal passes liquid nitrogen impact test (JB/T 12626).
- Pharmaceutical: 304 electropolished body (Ra≤0.8μm), FDA-compliant for pure water systems.
Full-Life Cost Advantage
- Wafer design reduces installation space by 30%, weight by 40% vs. flanged types, cutting transport costs.
- Replaceable seat design shortens on-site maintenance to 2 hours/operation, saving 60% in costs.
Global Certification Support
- Certified to CE-PED 2014/68/EU, API 594, WRAS (drinking water).
- Provides Material Test Reports (MTR), pressure test certificates, and third-party inspection.

Application

VI. Application Fields & Cases

LNG receiving station: DN200 PN16 316 SS check valve in -162℃ LNG line, 1000 thermal cycles leak-free.
Chemical plant acid water system: DN150 PN16 316L valve in pH 2-12 media, 5-year wear ≤0.05mm.
Supercritical power plant: DN100 PN16 304 valve in 425℃ superheated steam, water hammer resistance per ISO 16780.

VII. Installation & Maintenance Guide

Installation Notes
- Install between flanges, align flow with body arrow, torque bolts diagonally in three steps (ASME PCC-1).
- DN≥200 valves require supports to avoid pipeline stress affecting sealing.
Routine Maintenance
- Check disc mobility quarterly; replace pin grease annually for high temp (molybdenum disulfide base, dropping point ≥300℃).
- Minor seal wear can be lapped in-situ without complete replacement.