Flow Control - Valves
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Check Valves (non-return valves)
Derwent Industries specialises in a comprehensive range of check valves (non-return valves), offering various types to suit diverse applications. Our range includes tilting disc, swing type with lever and counterweight arms, wafer check, duo check, single flap check, flex check valves, and ball check valves. We supply valves that comply with Australian Standards AS 4794, available in sizes ranging from DN 10 to DN 1200, and pressure ratings from PN 6 to PN 40. With materials such as cast iron, ductile iron, stainless steel, PVC, and FIP thermoplastics, Derwent Industries provides high-quality check valves tailored to your needs, with options for positioners, limit switches, and relays upon request.
Basic Types of Check Valves & Their Applications
| Check Valve Type | Key Features | Primary Applications |
|---|---|---|
| Tilting Disc & Non-Slam | Designed to close rapidly before fluid flow reverses, significantly reducing shock wave pressure (water hammer). | High-pressure pumping stations, main water supply networks, and surge-sensitive lines. |
| Swing Type (With Lever & Counterweight) | Uses a swinging disc to allow full flow; lever and counterweight assist in smooth, controlled closing. | Wastewater treatment plants, raw water mains, and heavy slurry or viscous fluid handling. |
| Wafer & Duo Check | Compact design fitted directly between flanges; double-disc spring loading ensures fast response and low pressure drop. | Space-constrained installations, HVAC networks, and commercial industrial water lines. |
| PVC & Thermoplastic | Highly corrosion-resistant and lightweight plastic bodies designed for chemical compatibility. | Irrigation systems, chemical processing, and potable water distribution. |
FAQ
What types of check valves does Derwent Industries offer?
Derwent Industries provides a broad selection of check valves (non-return valves) designed to prevent backflow across diverse piping systems. Our range includes:
Tilting Disc Check Valves: Such as the D-AV-4010-PN25 and D-AV-4000 Series.
Swing Check Valves: Including resilient seated swing check valves (RSSC Series DN80–DN300) and models equipped with lever and counterweight arms.
Wafer & Duo Check Valves: Space-saving options like the AC10 Cast Iron Wafer Duo Check Valve, AC31 Single Flap Check Valve, and VT-WCF-316 series.
Non-Slam & Flex Check Valves: Features non-slam designs like the RSFC Resilient Seated Check Valve and NSCV series to minimize water hammer.
Thermoplastic & PVC Check Valves: FIP PVC options including the FVR Check Valve and FCROV PVC Wafer Swing Check Valve for chemical and lightweight fluid applications.
Ball & 3-Piece Check Valves: Specialized configurations such as the V3WC 3-Piece Check Valve and VTC/V-MP05 series.
What standards, sizes, and pressure ratings are available?
Our check valves strictly comply with Australian Standards (AS 4794). They are available in nominal sizes ranging from DN 10 up to DN 1200, with pressure ratings spanning from PN 6 to PN 40 to accommodate light distribution as well as heavy-duty industrial pressure lines.
What materials are available for Derwent Industries check valves?
We supply non-return valves in a variety of durable materials to match specific media requirements:
Cast Iron & Ductile Iron: Standard and heavy-duty double flanged options.
Stainless Steel: Grade 316 variants (e.g., VT-WCF-316 series) for corrosive environments.
Thermoplastics: High-grade PVC and FIP thermoplastics for irrigation and water treatment lines.
Can custom accessories and automation controls be added?
Yes, Derwent Industries offers custom-built check valves tailored to your project requirements. Optional add-ons include positioners, limit switches, and relays for monitoring valve orientation and remote control signal integration.