Check Valve

Check Valves (also known as Non-return Valves) – Essential Unidirectional Flow Control

  • A check valve (non-return valve) automatically ensures fluid flow in one direction only, preventing backflow and protecting pumps, compressors, and piping systems. Activated solely by fluid pressure, it requires no external control, making it ideal for fail-safe applications.

    Key Types of Check Valves:
    ☑ Swing Check Valve: A hinged disc swings open with forward flow and closes under reverse pressure.
    ☑ Lift Check Valve: Also known as Piston Check Valve - A piston-like disc lifts vertically to allow flow, then seats tightly under backflow.
    ☑ Ball Check Valve: A spring-loaded ball retracts during forward flow and seals against the seat when flow reverses.

    Advantages Across Industries:
    ☑ Zero Backflow Risk: Critical for oil & gas pipelines, chemical processing, and boiler feed systems.
    ☑ Low Maintenance: No manual intervention required for standard operation.
    ☑ Material Versatility: Bodies in cast iron, stainless steel (SS316), or alloys (Inconel®) for corrosive or high-temperature media.

    Typical Applications of Check Valves:
    Pump discharge protection, Steam condensate recovery, HVAC chilled water systems, Refinery hydrocarbon transfer

API 6D / BS 1868 Swing Check Valve

BS 1868 Check Valve, Swing Check Valve, Cast Steel Check Valve, High-Temperature Valve, Petrochemical Pipeline Valve
API 6D Swing Check Valve, Full-Bore Check Valve, High-Pressure Oil & Gas Valve, Piggable Pipeline Valve
Cast Steel Body: Heavy-duty construction for high-pressure oil, gas, and petrochemical pipelines.
Top-Entry Maintenance: In-line repair without pipeline disassembly (ideal for confined spaces).
Full-Bore Piggable Design: Smooth bore for seamless pipeline cleaning tool passage.
Multi-Orientation Installation: Horizontal or vertical (flow-upward) mounting flexibility.
De-Clutchable Lock: Secure disc open position during pigging or maintenance.
Design standard: BS 1868 / API 6D
Face to face: ASMEB16.10 / API 6D
Flange end: ASME B16.5 / ASME B16.47
BW end: ASME B16.25
Wall thickness: ASME B16.34
Inspection and test: API 598 /API 6D
Pressure and temperature: ASME B16.34
Product range: NPS 2″~NPS 36″,CL150~CL2500
Material: WCB､LCB､WCC､WC6､WC9､CF8､CF8M､CF3､CF3M､A890 4A etc.

Forged Piston Lift Check Valve

Forged Piston Check Valve, API 602 Check Valve, High-Pressure Lift Check Valve, Zero Leakage Valve, Oil & Gas Pipeline Valve
Forged Steel Body: ASTM A105/A182 F316L for high-pressure oil, gas, and steam systems (ASME Class 1500-4500).
Piston Lift Mechanism: Spring-assisted vertical disc movement ensures instant reverse flow shutdown with minimal pressure drop.
Compact Design: Short face-to-face length (ASME B16.10) saves space in refineries, petrochemical plants, or offshore platforms.
Low Maintenance: Self-aligning guide bushings and anti-wear stem coating extend service life.
Multi-Connection Options: RF/RTJ flanges (ASME B16.5), socket weld, or threaded ends.
Design to BS5352, API 602, API 6D, ASME B16.34
Flange Dimension to ASME B16.5
Face to face to ASME B16.10, API 6D
Pressure & Temperature Rating  to ASME B16.34
Test & inspection to API 598
Materials: CF8M (SS316), CF8 (SS304), A105N, LF2 etc.
Pressure: CLASS 150 ~2500
Suitable Temp.: -196ºC~550ºC
Suitable Medium: Water, Natural Gas, Oil

API 594 Wafer Check Valve

Retainerless Wafer Check Valves, dual plate / double disc, options in Stainless Steel CF8M,
Carbon Steel WCB or Alloy Steel material with class 150, class 300, and class 600 etc.
Design standard: API 594
Face to face: API 594
Pipe flange: ASME B16.5
Wall thickness: ASME B16.34
Inspection and test: API 598
Pressure and temperature: ASME B16.34
Product range: NPS 1/2″~NPS 36″,CL150~CL2500
Material: WCB､LCB､WCC､WC6､WC9､CF8､CF8M､CF3､CF3M､A890 4A､A105､LF2､
F11､F22､F51､F91､F304､F316､F304L､F316L etc.

API 6D Axial Flow Check Valve (also known as Nozzle Check Valves)

API 6D Axial Check Valve, ASME B16.34 Valve, Carbon Steel WCB, Zero Water Hammer Valve, High-Pressure Pipeline Valve
One-Piece Carbon Steel Body: Lightweight yet robust up to DN500 PN64 oil & gas pipelines.
Axial Flow Design: Optimized flow path minimizes pressure loss and prevents cavitation, ensuring stable, low-noise operation.
Spring-Assisted Closure: Instant shutoff via spring thrust force, even at low pressure, eliminating reverse flow and pump damage.
Omni-Directional Installation: Precision-engineered disc carrier allows vertical/horizontal mounting with bubble-tight sealing.
Anti-Jamming Mechanism: Surface-treated disc/pin and axial alignment prevent sticking, ensuring smooth cycling.
RF Flanged Ends: Secure ASME B16.5 flange connections for high-integrity joints.
Product Name: API 6D Axial Flow Check Valves
Design Standard: API 6D, ASME B16.34
Body Material: ASTM A216 WCB
Size: 20 Inch, DN500
Pressure: Class 400 LB, PN64
End Connection: RF Flanged

Tilting Disc Check Valve

Tilting Disc Check Valve, API 6D Valve, High-Pressure RTJ Flange, Low-Flow Check Valve, Zero Noise Valve
Pressure-Seal Bonnet: ASTM A216 WCB body with 12” Class 2500 rating ensures zero leakage in extreme conditions.
Centrally Pivoted Disc: Stable open position at low flow rates vs. swing checks, reducing cracking pressure and energy loss.
RTJ Flanged Ends: ASME B16.5 Ring-Type Joint for high-pressure gas/oil pipelines.
Micro-Elastic Metal Seat: Bubble-tight sealing with impact-free closure, eliminating noise and vibration.
Streamlined Flow Path: Butterfly disc design minimizes flow resistance, outperforming swing valves in low-pressure systems.
roduct Name: Pressure Seal Tilting Disc Check Valve
Design Standard: ASME B16.34 / API 6D
Body Material: ASTM A216 WCB
Size: 12 Inch, DN300
Pressure: Class 2500 LB, PN250
End Connection: RTJ