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Zpětné ventily

  • DN250-PN16 Wafer Dual Plate Check Valve
    DN250-PN16 Wafer Dual Plate Check Valve
    Product Name Wafer Dual Plate Check Valve / Wafer Double Door Check Valve
    Type/Series General Purpose (e.g., Series equivalent to Pegler V909, Oventrop, Honeywell Impact)
    Nominal Diameter DN250 (10 inches)
    Nominal Pressure PN16
    End Connection Wafer Type Design, designed for installation between PN16 flanges (According to EN 1092-2, ISO 7005-2, or ASME B16.5 Class 150)
    Design Structure Dual Plate / Double Door with Spring-Loaded Hinge
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  • DN80-PN40-RF Axial Check Valve
    DN80-PN40-RF Axial Check Valve
    Nominal Size DN80
    Pressure Rating PN40 (4.0 MPa / 40 bar / 580 psi)
    Connection Type Flanged, Raised Face (RF)
    Flange Standard EN 1092 1 (Type B1 or B2) / ASME B16.5 optional
    Design Standard API 594 (Type B – wafer or lug) or manufacturer specific
    Face to Face Dimension Wafer type: per API 594 / EN 558 Series 48 (approx. 60 – 70 mm)
    Construction Axial flow – streamlined body, centre guided disc, spring assisted closure
    Body Material WCB (Carbon Steel) / CF8M (316 SS) / Ductile Iron
    Disc / Trim Stainless steel (CF8M) with optional Stellite hardfacing
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  • DN50-PN40-RF Axial Check Valve
    DN50-PN40-RF Axial Check Valve
    Nominal Diameter (DN) 50 mm
    Nominal Pressure (PN) 40 bar
    Connection Type RF (Raised Face Flange)
    Design Type Axial, Spring-Assisted
    Applicable Media Water, Oil, Steam, Gas, etc.
    Media Temperature Range -20°C ~ +200°C
    Body Material Carbon Steel WCB / Stainless Steel 304 / 316
    Disc Material SS 304/316 + Stellite hard-faced sealing
    Seat Seal Metal Hard Seal / Soft Seal (PTFE)
    Spring Material SS 316 / Inconel X-750
    Flange Standard EN 1092-1 (PN40) / ASME B16.5 (Class 300)
    Cracking Pressure ≤ 0.1 bar
    Full Flow Pressure Drop ≤ 0.02 bar
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  • DN8-PN40 Y Pattern Lift Check Valve
    DN8-PN40 Y Pattern Lift Check Valve
    Nominal Diameter (DN) DN8
    Nominal Pressure (PN) PN40 (40 bar)
    Body Configuration Y Pattern
    Valve Type Lift Check (Spring-loaded)
    Applicable Media Water, oil, gas, non-corrosive or mildly corrosive media
    Temperature Range -20°C to +180°C (depending on sealing material)
    End Connections Threaded / Socket Weld / Butt Weld (optional)
    Flow Direction Unidirectional, arrow marked on body
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  • 2″-2500LB Inconel 625 Lift Check Valve
    2″-2500LB Inconel 625 Lift Check Valve
    Nominal Size 2″ (DN50)
    Pressure Rating Class 2500 (PN 420)
    Valve Type Lift Check Valve – Automatic Non Return
    Body Construction Pressure Seal Bonnet (recommended for Class 2500)
    End Connections Flanged – ASME B16.5 Class 2500, Ring Type Joint (RTJ) facing standard
    Temperature Range –196°C ~ +650°C (depending on trim)
    Suitable Media Sour gas, seawater, high pressure steam, superheated water, corrosive chemicals, acidic environments
    Flow Direction Horizontal (preferred) or vertical with upward flow
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  • 1″-600LB-SW Close Die Forged Lifting Check Valve
    1″-600LB-SW Close Die Forged Lifting Check Valve
    Valve Type Lifting Check Valve (Piston / Disc Type)
    Nominal Size 1 inch (DN25)
    Pressure Rating Class 600
    Connection Type Socket Weld (SW) Ends
    Body / Bonnet Material ASTM A105 (Carbon Steel) or ASTM A182 F316 (Stainless Steel)
    Operation Automatic (Flow-dependent)
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A check valve, also known as a non-return valve, is a type of valve that allows fluid or gas to flow in one direction only, preventing backflow that could damage equipment or disrupt system performance. It operates automatically and doesn’t require manual or external control. Inside the valve, a disc or similar mechanism opens when fluid flows in the intended direction and closes if the flow reverses. There are several types of check valves, such as swing, lift, ball, and diaphragm types, each designed for specific applications or media. For instance, swing check valves are commonly used in water and wastewater systems, while lift check valves are more suitable for high-pressure lines. Check valves are critical in protecting pumps, compressors, and pipelines from backflow damage, maintaining pressure, and preventing contamination. Their simple, self-operating design makes them ideal for both industrial and domestic use, especially in systems where reliability and safety are essential.

Why Are Check Valves Important In Piping Systems?

Check valves are essential components in piping systems because they automatically prevent reverse flow, which can cause serious issues such as water hammer, pressure drops, contamination, and equipment failure. In systems involving pumps, check valves ensure that the fluid only moves in the desired direction, thereby avoiding potential damage when the pump shuts down or pressure fluctuates. They are especially important in systems with vertical piping or in applications where back pressure is a concern. Additionally, check valves contribute to system efficiency by maintaining line pressure and reducing the load on pumps and compressors. Their ability to operate without human intervention also makes them reliable safety devices in both high-pressure and low-pressure systems. Whether used in water treatment, oil and gas, HVAC, or chemical processing, check valves play a vital role in maintaining flow control, system integrity, and operational safety.

Check Valves FAQ

  • 1.What does a check valve do?

    It prevents reverse flow in a piping system.

  • 2.Is a check valve one-way?

    Yes, it only allows flow in one direction.

  • 3.Can check valves be installed vertically?

    Yes, but only certain types like lift or spring-loaded ones.

  • 4.Do check valves need maintenance?

    Generally low-maintenance, but periodic checks help.

  • 5.Where are check valves commonly used?

    Pumps, pipelines, HVAC, water treatment, and chemical systems.

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