Cast Steel Swing Check Valve

2025-07-01

1. General Introduction

The Cast Steel Swing check valve is a type of non-return valve designed to prevent backflow in pipelines while allowing fluid to flow in one direction. Made from cast steel, it combines high strength with durability, suitable for high-pressure and high-temperature applications.

2. Working Principle

The valve features a hinged disc (flap) that swings on a pivot within the valve body:

Open State: When fluid flows in the forward direction (from inlet to outlet), pressure pushes the disc upward, allowing unobstructed flow.
Closed State: If fluid reverses direction, the disc drops onto the seat by gravity and backflow pressure, creating a seal to prevent reverse flow.

3. Design Features

Body Material: Cast steel (e.g., WCB, WC6) offers high tensile strength and resistance to corrosion, suitable for harsh media like steam, oil, or chemicals.
Disc & Seat:
- Disc: Typically made of cast steel or stainless steel, with a resilient seal (e.g., rubber or PTFE) for tight shut-off, or metal-to-metal contact for high-temperature use.
- Seat: Integral to the body or replaceable, designed for wear resistance.
Pivot Mechanism: Hinged design allows the disc to swing freely, ensuring quick response to flow direction changes.

4. Applications

Oil & Gas Pipelines: Prevents backflow in crude oil, natural gas, or petroleum product transport systems.
Power Generation: Used in steam systems, boiler feedwater lines, and condensate return lines.
Chemical & Petrochemical Industries: Controls flow in pipelines carrying corrosive or high-viscosity fluids.
Water & Sewage Systems: Prevents backflow in water supply, drainage, and irrigation networks.

5. Advantages

Reliable Backflow Prevention: Quick-acting disc ensures tight shut-off to prevent system damage from reverse flow.
High Pressure/Temperature Resistance: Cast steel construction makes it suitable for heavy-duty industrial applications.
Low Flow Resistance: Streamlined design minimizes pressure drop during forward flow.
Easy Maintenance: Removable bonnet and replaceable seat/disc allow for convenient repair without pipeline disassembly.

In conclusion, the Cast Steel Swing Check Valve is a robust solution for unidirectional flow control, valued for its durability and performance in demanding industrial environments.

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