DN150 PN16 DIN Double Disc Stainless Steel Wafer Type Spring Check Valve

Product Attribute: Port Size:dn50-dn1000
structure:Check
application:General
power:Manual
customized support:OEM, ODM, OBM
temperature of media:Low/Normal Temperature
brand name:TIANYU
media:Water
Standard or Nonstandard:Standard
Size:50mm-1000mm
Connection:wafer
Body material:Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel
Seal material:rubber sealing
flow direction:reversing
Product name:butterfly check valve
Type:Wafer Type Check Valve
Certificate:ISO9001:2008 CE

INFO@TYFLUIDGROUP.COM

Specification

TIANYU Wafer-Type Double-Disc Stainless Steel Spring Check Valve: Industrial Pipeline Backflow Prevention Solution

I. Product Overview

TIANYU wafer-type double-disc stainless steel spring check valves are designed to API 594 and DIN PN16 standards, constructed from 304/316 stainless steel. Featuring dual-disc linkage and spring-loading mechanisms, they automatically prevent backflow in pipelines. Covering DN50-DN1000 (2″-40″) with PN10-PN16 (1.0-1.6MPa) pressure ratings and -10℃~150℃ operating temperatures, these valves are suitable for water, steam, oil, and corrosive media in municipal water supply, petrochemical, and food processing applications.

II. Core Technical Parameters

Specifications & Operating Range
- Nominal Diameter: DN50/80/100/150/200/250/300/400/500/600/800/1000 (2″-40″)
- Pressure Class: PN10 (1.0MPa), PN16 (1.6MPa)
- Temperature Range: -10℃~150℃ (standard), -40℃~200℃ (high-temperature option)
- Media Compatibility: Water, sewage, seawater, steam, oil, acids/bases (pH 4-10)
Materials & Sealing System
- Body/Disc: 304 stainless steel (ASTM A351 CF8), 316 stainless steel (ASTM A351 CF8M)
- Sealing Pair: NBR rubber (standard), EPDM (temperature-resistant), Viton (oil-resistant), leakage rate ≤0.1% (API 598)
- Spring/Pin: 304 stainless steel (HRC28-32), corrosion-fatigue resistant
- Connection: Wafer Type (fits DIN PN10/16 flanges)
Mechanical Performance
- Opening Pressure: ≤0.03MPa (forward flow resistance)
- Closure Response Time: ≤0.2s (triggered by backflow)
- Water Hammer Protection: Withstands 1000 Impact tests without damage (ISO 16780)

Product Overview

III. Structural Design & Technical Features

Dual-Disc Spring Linkage Mechanism
- Symmetric dual-disc design disperses medium impact; spring-loading ensures rapid reset under low pressure, closing 40% faster than single-disc valves to eliminate water hammer.
- Disc opening angle ≤45° with streamlined flow path, DN100 pressure loss ≤0.05MPa (30% lower than lift checks).
Seal & Wear Optimization
- Embedded rubber seat forms elastic extrusion seal with disc, specific pressure ≥12MPa for bidirectional bubble-tight performance.
- Chrome-plated pin (thickness ≥20μm) with PTFE bearings reduces friction, enabling >100,000 operation cycles.
Compact Lightweight Design
- Wafer structure shortens length by 50% and reduces weight by 40% vs. flanged types, saving installation space and transport costs.
- Precision-cast body with surface roughness Ra≤12.5μm minimizes medium deposition and corrosion risk.

IV. Manufacturing Processes & Quality Control

Precision Casting Flow
- Silica sol investment casting process, blank dimension tolerance ≤±0.5mm, 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.
Assembly & Testing System
- Disc-seat lapping with contact rate ≥85% (red lead test), spring load deviation ≤±5%.
- Hydrostatic test: 1.5x pressure (2.4MPa for PN16) held 30min, 1.1x sealing pressure—zero leakage.
- Life test: 100,000 cycles without sealing degradation (GB/T 13932).
Certifications & Compliance
- CE-PED 2014/68/EU, ISO 9001:2015 certified; compliant with WRAS (drinking water), ACS (French sanitary standard).
- Provides Material Test Reports (MTR), pressure test certificates, and third-party inspection.

Valve Details

V. Core Product Advantages

Multi-Scenario Backflow Protection
- Municipal water supply: DN300 valve at pump station prevents backflow, 5-year leak-free operation.
- Petrochemical pipelines: 316 SS resists sulfurous media (H₂S≤100ppm) for distillation unit condensate systems.
- Food processing: FDA-certified NBR seal for DN80 valve in clean steam systems, condensate meets USP purified water standards.
Full-Life Cycle Cost Optimization
- Replaceable seal design shortens on-site maintenance to 2 hours/operation, reducing costs by 60%.
- Maintenance-free cycle reaches 8 years or 100,000 operations, 50% longer than cast iron valves.
Installation & Maintenance Convenience
- Disc and spring assembly replaceable without pipeline disassembly; supports horizontal/vertical installation (vertical flow upward).
- Provides installation videos and torque guides, bolts torqued diagonally in three steps (DIN EN 1514-3).

Application

VI. Application Fields & Cases

Wastewater treatment plant: DN600 PN16 valve in aeration tank inlet reduces sludge backflow, water hammer protection decreases pipeline vibration by 60%.
LNG receiving station: DN150 316 SS valve in -10℃ LNG line maintains spring ductility, closure response ≤0.3s.
Industrial steam network: DN200 PN16 valve controls 130℃ steam, EPDM seal annual leakage ≤0.5m³.

VII. Installation & Maintenance Guide

Installation Notes
- Center valve between flanges, align flow with body arrow; bolt torque graded as DN100≤85N·m, DN200≤180N·m.
- DN≥300 valves require supports to avoid pipeline stress affecting seals.
Routine Maintenance
- Check disc mobility quarterly; replace pin grease annually for high temp (silicone-based, 200℃ resistance).
- Minor seal leakage repairable via seat lapping or rubber seal replacement, no need for full valve replacement.