PN16 stainless steel Flanged Forged Steel Lift 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
Connection Form:Flange Type
Media:Water, gas, oil, etc
Valve Body/Seat:Stainless Steel
Drive Mode:Manual
Temperature:-196 C-600 C
Diameter:DN80
Nominal Pressure:PN16

INFO@TYFLUIDGROUP.COM

Specification

TIANYU Flanged Forged Steel Lift Check Valve: Industrial Pipeline Backflow Prevention Solution

I. Product Overview

TIANYU flanged forged steel lift check valves comply with GB/T 12235 standards, constructed from A105 forged carbon steel and 304/316 stainless steel. The valve ensures unidirectional flow through gravity-assisted disc reset and medium pressure, covering DN15-DN300 (1/2″-12″) with PN16-PN100 (1.6-10.0MPa) pressure ratings and -196℃~600℃ temperature range. Suitable for water, steam, oil, and natural gas, it prevents equipment damage and process interruptions from backflow.

II. Core Technical Parameters

Specifications & Pressure-Temperature Range
- Nominal Diameter: DN15/20/25/40/50/80/100/150/200/250/300 (1/2″-12″)
- Pressure Class: PN16/PN25/PN40/PN64/PN100 (1.6-10.0MPa)
- Temperature Range: -196℃~230℃ (304 stainless steel), -29℃~600℃ (A105 carbon steel with high-temp treatment)
Materials & Sealing System
- Body/Bonnet: A105 forged carbon steel (tensile strength ≥485MPa), 304/316 stainless steel (ASTM A182)
- Disc/Seat: 304 with STL alloy overlay (HRC58-62), sealing surface roughness Ra≤0.4μm
- Gasket: Metal wound gasket (resists 600℃), leakage rate ≤1×10⁻⁶cc/s (API 598)
- Connection: Flanged (RF face, GB/T 9113/ASME B16.5)
Mechanical Performance
- Opening Pressure: ≤0.05MPa (forward flow resistance)
- Closure Response Time: ≤0.3s (triggered by backflow)
- Water Hammer Resistance: 1000 cycles without damage (ISO 16780)

Product Overview

III. Structural Design & Technical Features

Lift Check Mechanism
- Disc lifts along vertical guide rods coaxial with the flow path, sealing specific pressure ≥15MPa.
- Guide groove precision ≤0.03mm ensures smooth reset, preventing jamming-induced seal failure.
Forging Process Advantages
- Body formed by die forging, normalized at 920℃ to eliminate internal porosity, grain size refined to Grade 7.
- 40% higher fatigue resistance than cast bodies, suitable for vibrating applications.
Temperature Adaptability
- Cryogenic: Extended bonnet (≥100mm) prevents frosting at -196℃ liquid nitrogen.
- High-temperature: Disc loaded by disc spring, sealing surface compensation ≥0.1mm at 600℃.

IV. Manufacturing Processes & Quality Control

Precision Machining
- Seat sealing surface CNC ground to flatness ≤0.01mm, red lead test contact rate ≥85%.
- Disc-guide rod assembly coaxiality ≤0.05mm to ensure vertical movement.
Quality Inspection System
- Hydrostatic test: 1.5x shell pressure (2.4MPa for PN16) held 30min, 1.1x sealing pressure with zero leakage.
- NDT: 100% magnetic particle inspection (MPI) for surface cracks, ultrasonic testing (UT) for internal defects.
- Life test: 100,000 cycles without sealing degradation (GB/T 13932).

Valve Details

V. Core Product Advantages

Multi-Medium Compatibility
- Petrochemical: 316 stainless steel resists H₂S (≤100ppm) for FCC unit rich gas pipelines.
- Power: A105 body lasts >8 years in 425℃ superheated steam with erosion-resistant seats.
- LNG: -196℃ cryogenic design ensures disc reset ≤0.2s to prevent pump reverse rotation.
Full-Life Reliability
- Replaceable seat design reduces on-site maintenance cost by 50%.
- Maintenance-free cycle reaches 5 years or 100,000 cycles, 30% longer than similar products.
Certification & Support
- Certified to API 594, CE-PED, meets SIL 2 functional safety requirements.
- Provides Material Test Reports (MTR), pressure test certificates, and 3D model downloads.

Application

VII. Installation & Maintenance Guide

Installation: Mount horizontally, align flow with body arrow, torque flange bolts diagonally (ASME PCC-1).
Routine Maintenance: Inspect disc seal wear annually; replace graphite packing every 2 years for high-temp applications.
Troubleshooting: Disassemble bonnet to check guide rod jamming without pipeline removal for backflow issues.

VIII. Product Summary & Market Positioning

TIANYU flanged forged steel lift check valves leverage forging technology and wide-temperature design, covering DN15-DN300 with PN16-PN100 ratings. Rigorous QC and multi-industry validation deliver reliable backflow prevention for petrochemical, power, and energy sectors, offering long-life and easy maintenance as an industrial pipeline essential.

PN16 stainless steel Flanged Forged Steel Lift Check Valve

Specification