Specification

DN100 PN16 Cast Steel Wafer Type Single Disc Swing Check Valve

I. Product Overview

TIANYU DN100 PN16 cast steel wafer type single disc swing check valve is a specialized backflow prevention solution engineered for industrial pipelines. Crafted with cast steel (QT450/WCB) and featuring a wafer-type structure, it relies on a single swing disc to ensure unidirectional flow of water, gas, oil, and mild corrosive media (acids, alkalis). Operating across -196℃~550℃ and PN16 pressure, it closes automatically when flow reverses, protecting pumps, valves, and system components from damage. Compliant with GB, API, and DIN standards, it balances compact design, durability, and reliable backflow prevention—ideal for petroleum, chemical, water supply, and hydraulic systems where space-saving and safety are critical.

II. Key Attribute Parameters

Size: DN100 (4″), optimized for medium-diameter pipelines in industrial flow control systems.
Pressure Rating: PN16 (1.6MPa), suitable for low to medium pressure applications such as water distribution and oil transfer lines.
Temperature Range: -196℃~550℃, with cast steel (WCB) handling high temperatures and stainless steel (304/316) adapting to extreme cold or corrosive environments.
Material Configuration:
- Body: Cast steel (QT450/WCB) for structural strength; optional 304/316 stainless steel for corrosion resistance.
- Disc & Hinge: Cast steel or stainless steel, ensuring smooth swing movement and wear resistance.
- Seal: Metal-to-metal (for high temperature) or PTFE-lined (for tight shut-off), preventing leakage under pressure.
- Fasteners: High-strength alloy steel, resisting vibration and pressure-induced loosening.
Connection Type: Wafer type, fitting between pipeline flanges to save installation space without flanges on the valve body.
Applicable Media: Water, gas, oil, acid, alkali, and hydraulic fluids.
Design Standards: GB, API 6D, DIN, ensuring compatibility with global industrial systems.

Product Overview

III. Features Description

Single Disc Swing Structure: The disc swings open under forward flow (driven by media pressure) and closes automatically via gravity when flow stops or reverses. This instant response (≤1 second) prevents backflow that could damage pumps, mix media, or cause pipeline overpressure—critical for hydraulic and chemical systems.
Wafer Type Design: The valve body lacks flanges, fitting directly between pipeline flanges and secured with long bolts. This reduces overall length by 30% compared to flanged check valves, saving space in compact installations like water treatment plants or skid-mounted equipment.
Dual Seal Options: Metal-to-metal sealing suits high-temperature media (up to 550℃) such as steam, while PTFE-lined seals achieve ANSI/FCI Class IV leakage for low-temperature, clean media like drinking water—enhancing versatility across applications.
Cast Steel Durability: QT450/WCB cast steel resists deformation under PN16 pressure and mechanical impact, with a smooth internal surface (Ra ≤1.6μm) minimizing flow resistance and avoiding media stagnation.
Wide Temperature Adaptability: From cryogenic fluids (-196℃) to high-temperature steam (550℃), the valve maintains structural integrity—eliminating the need for separate valves in systems with temperature fluctuations.

IV. Manufacturing Processes

Material Preparation: Cast steel ingots undergo ultrasonic testing to detect internal defects. Chemical analysis verifies carbon content (2.5~3.5% for QT450) to ensure strength and toughness.
Body & Disc Machining: CNC lathes precision-machine the wafer body to flatness tolerance ≤0.05mm, ensuring tight contact with pipeline flanges. The disc is ground to a smooth edge (Ra ≤0.8μm) for seamless swing movement.
Hinge Assembly: The hinge pin is press-fitted into the body with clearance ≤0.1mm, allowing the disc to swing freely without jamming. A 100-cycle test confirms smooth operation under simulated flow conditions.
Seal Processing: Metal seats are lapped with the disc to achieve uniform contact; PTFE seals are bonded to the seat via high-temperature adhesive, with pressure testing (0.6MPa air) to verify adhesion.
Testing:
- Hydrostatic Test: Body tested at 2.4MPa (1.5×PN16) for 30 minutes; seat tested at 1.76MPa (1.1×PN16) with water to confirm no backflow leakage.
- Operation Test: Simulated forward/reverse flow tests verify disc closure speed and sealing performance.

Valve Details

V. Product Advantages

Space-Saving Installation: Wafer type design reduces pipeline length, lowering installation costs by 20% in space-constrained systems like industrial skids or building utility rooms.
Reliable Backflow Prevention: Instant disc closure avoids pump cavitation and media mixing, reducing maintenance costs by 40% compared to slow-closing check valves.
Durable in Harsh Conditions: Cast steel construction resists corrosion and pressure, extending service life to 10+ years in industrial environments—outperforming plastic or brass valves.
Low Flow Resistance: Streamlined internal design minimizes pressure drop by 15% vs. lift check valves, improving energy efficiency in water and oil transfer lines.
Easy Maintenance: Wafer type allows quick removal for cleaning or seal replacement without disconnecting adjacent pipelines, reducing downtime.

Application

VI. Application Fields

Water Supply & Drainage: Prevents backflow in municipal water distribution and wastewater lines, with PTFE seals ensuring no contamination between clean and untreated water.
Hydraulic Systems: Protects pumps and cylinders in industrial hydraulic circuits, avoiding oil backflow that could cause equipment failure.
Chemical Processing: Controls flow of mild acids/alkalis in dosing lines, with stainless steel options resisting corrosion and metal seals handling high-temperature reactants.
Petroleum Auxiliary Systems: Manages low-pressure oil and gas flow in refineries, with cast steel resisting hydrocarbon-induced wear.
Heating & Ventilation: Regulates hot water and steam flow in building heating systems, where metal-to-metal seals withstand high temperatures.