API JIS DIN CLASS 300 Flanged Carbon Steel/Stainless Steel Swing Check Valve

Product Attribute: Size Range:2″~24″
Material:Cast Steel
Connection Form:Flange
Structure:Swing
Pressure:Class300
Function:Reversing
Sealing Form:Gland Packing
Flow Direction:Reversing
Standard:ANSI
Application:Water,Oil,Air
Body Material:Wcb/CF8/CF8m
Flange Standard:ASME B16.5
Test Standard:API 598
Specification:CE
Media: Water.Oil,Gas.etc.
Temperature: Ordinary Temperature

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Specification

DN300 Class 300 Carbon Steel/Stainless Steel Flanged Swing Check Valve

I. Product Overview

TIANYU DN300 Class 300 carbon steel/stainless steel flanged swing check valve is a key backflow prevention component for large-diameter industrial pipelines. Made of carbon steel (WCB) or stainless steel (CF8/CF8M) and featuring a flanged connection, it uses a swing disc to control unidirectional flow of water, oil, gas, and other media. It operates at -20℃~425℃ and Class 300 pressure, closing automatically when flow reverses to protect pumps and pipelines. Compliant with API 6D and ASME standards, it’s ideal for oil & gas, power, and chemical industries.

II. Key Attribute Parameters

Size: DN300 (12″), suitable for large-diameter industrial pipelines.

Pressure Range: Class 300 (5.0MPa), for medium to high-pressure systems like oil transmission.

Temperature Range: -20℃~425℃, adapting to heated media such as steam.

Material Configuration:

- Body & Bonnet: WCB (carbon steel) for general use; CF8/CF8M (stainless steel) for corrosion resistance.

- Disc & Arm: WCB or CF8/CF8M, ensuring strength and smooth swing.

- Seat: Metal-to-metal (A105), for tight sealing under high pressure.

- Gasket: Graphite + SS304, resisting high temps and preventing leakage.

- Fasteners: A193 B7 studs, A194 2H nuts, withstanding pressure.

Connection: Flanged (ASME B16.5), for secure pipeline integration.

Standards: API 6D, ASME B16.34, API 598.

Product Overview

III. Features Description

Swing Disc Backflow Prevention: The disc opens with forward flow and closes via gravity in 1-2 seconds when flow reverses, avoiding pump cavitation and pipeline damage in oil and power systems.

Metal-to-Metal Sealing: Precision-machined seat and disc (Ra ≤1.6μm) ensure tight sealing under Class 300 pressure, resisting media erosion for long-term reliability.

Flanged Stability: Flanges meet ASME B16.5, aligning with pipelines. Graphite gaskets enhance sealing, adapting to vibration in industrial settings.

Robust Structure: Thick-walled body (min 15mm) resists Class 300 pressure. Integrated arm and disc reduce stress, extending service life.

Low Flow Resistance: Streamlined design minimizes pressure loss, cutting energy use in large pipelines.

IV. Manufacturing Processes

Material Inspection: Castings undergo ultrasonic testing. Spectral analysis checks alloy content (e.g., WCB carbon ≤0.30%).

Precision Machining: CNC machines process flanges and seals, with flatness ≤0.05mm. Discs are ground for smooth swing.

Assembly: Hinge pins are press-fitted for stability. Disc swing angle is calibrated to 60-70° for flow and closing speed.

Testing:

- Hydrostatic: Body tested at 7.5MPa (1.5×Class 300) for 30 mins; seat at 5.5MPa (1.1×Class 300) with no leakage.

- Operation: 100+ cycles confirm smooth disc movement.

Valve Details

V. Product Advantages

Reliable Backflow Protection: Rapid closing reduces equipment damage risks, cutting maintenance costs by 30% in industrial systems.

High Pressure Resistance: Class 300 rating and robust materials handle high pressure, lasting 15+ years in oil and power applications.

Strong Compatibility: Flanged design and standards compliance fit global pipelines, avoiding installation issues.

Easy Maintenance: Flanged connection allows component replacement without pipeline removal, reducing downtime.

Energy Efficiency: Low flow resistance saves 15% energy in large water and oil pipelines.

Application

VI. Application Fields

Oil & Gas: Prevents backflow in crude oil and gas pipelines. WCB resists hydrocarbons; CF8M handles corrosive media.

Power Generation: Protects boiler feedwater and steam lines, avoiding water hammer and equipment damage.

Chemical Processing: Controls chemical and solvent flow. Stainless steel resists acids/alkalis for media purity.

Water Treatment: Manages large water transmission, preventing cross-contamination in municipal systems.

Metallurgy: Handles cooling water in steel mills, with durable design resisting industrial harsh conditions.