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Check Valve
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Designed for dependable one-way flow protection, the Swing Check Valve automatically prevents reverse flow by allowing the disc to open under forward flow and return to the closed position when flow reverses. Its simple hinged-disc mechanism provides unobstructed flow characteristics and dependable operation without the need for external actuation. The straightforward construction makes it a practical choice for pipelines and process systems where reliable backflow prevention is required.
The Swing Check Valve is suitable for applications across oil & gas, petrochemical, chemical processing, power generation, water treatment, and general industrial services. With a range of body, seat, and end-connection configurations available, it can be adapted to different pressure classes, temperatures, and process media while helping protect pumps, compressors, and downstream equipment from reverse flow.
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Product description |
Swing Check Valve |
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Model |
H44H-Swing Check Valve |
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Nominal diameter |
2”～50” |
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Operating temperature |
-196℃～593℃(the range of service temperature may vary for different materials) |
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Operating pressure |
150-2500 CLASS |
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Material |
Main material: A216 WCB、WCC;A217 WC6、WC9、C5、C12、C12A、CA15;A351 CF8、CF8M、CF3、CF3M、CF8C、CN3MN、CK3MCUN、CN7M;A352 LCB、LCC;A494 CW-6MC、CU5MCuC、M35-1；A995 4A(CD3MN)、5A(CE3MN)、6A(CD3MWCuN)；ASME B 148 C95800、C95500, etc. |
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Design standard |
API 6D、API 594、BS 1868、ASME B16.34、GB 12236、GB 12224 |
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Structural length |
ASME B16.10 |
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Connecting end |
ASME B16.5、ASME B16.25、GB 9113、GB 12224 |
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Test standard |
API 598、ISO 5208、JB/T9092、GB/T13927 |
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Operation method |
The valve clack can be automatically opened and closed with the medium force, movement weight can be increased to facilitate fast closing of valve clack, hydraulic cylinder can be increased to facilitate slow closing of valve clack to prevent vibration of pipeline, and pigging can be performed through manual opening and locking the valve clack at the opening position. |
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Application fields |
For application in fields such as electric power industry, petroleum refining, petrochemical engineering, offshore oil, tap water engineering in urban construction, chemical engineering, etc. |
Protects piping systems by automatically preventing backflow and maintaining process integrity.
Hinged Disc Design
The disc swings freely on a hinge, opening with forward flow and closing automatically when flow direction changes.
Automatic Operation
No external actuator or power source is required, simplifying the valve arrangement and reducing operating components.
Low Flow Resistance
The disc moves fully away from the flow path under suitable operating conditions, allowing efficient fluid passage.
Effective Backflow Prevention
Automatic disc closure helps protect pumps, compressors, vessels, and other equipment from reverse-flow damage.
Simple & Proven Construction
A straightforward internal mechanism facilitates reliable operation and simplifies inspection and servicing.
Suitable for Various Flow Conditions
Available in different configurations to accommodate liquid, gas, and other compatible process media.
Flexible Seat Options
Metallic or resilient seating arrangements can be selected according to pressure, temperature, and service requirements.
Multiple Installation Options
Available with various end connections and pressure classes to integrate with different piping systems.
Easy Maintenance
The hinged disc and accessible internal components allow convenient inspection and replacement of wear parts during maintenance.
Broad Industrial Application
Suitable for oil & gas, petrochemical, chemical processing, power generation, water treatment, and general industrial pipeline systems.
Chemical Industry
Ball valves, butterfly valves, gate valves, globe valves, check valves, and control valves ensure safe fluid isolation, precise process control, and reliable operation in demanding chemical processing applications.
Oil Industry
Engineered for reliable isolation, flow regulation, and backflow prevention, our valve solutions support upstream, midstream, and downstream oil production and refining operations.
Natural Gas
Providing leak-tight sealing, dependable flow control, and safe pipeline operation for natural gas transmission, storage, LNG, and distribution systems.
Metallurgy
Built to withstand high temperatures, abrasive media, and harsh operating conditions in steelmaking, smelting, and metallurgical processing.
Power Generation
Ensuring reliable isolation, accurate flow control, and long-term performance in steam, boiler, turbine, and power plant systems.
Pharmaceutical
Delivering hygienic, precise, and contamination-free flow control for pharmaceutical manufacturing and clean process applications.
Steel Industry
Designed for high-temperature, high-pressure, and severe-service conditions in iron making, steelmaking, rolling mills, and auxiliary process systems.
New Energy
Supporting hydrogen, LNG, carbon capture, battery materials, and renewable energy projects with advanced valve solutions for safe and efficient process control.
-196°C Cryogenic Liquid Nitrogen Test System
Simulates ultra-low-temperature operating conditions to verify valve sealing performance and reliability for cryogenic applications.
Brinell, Rockwell & Vickers Hardness Tester
Ensures material hardness meets international standards for strength, durability, and long-term performance.
Large-Scale Coordinate Measuring Machine (CMM)
Provides high-precision dimensional inspection to ensure machining accuracy and product consistency.
Valve Life Cycle Testing System
Evaluates valve durability and operational reliability through repeated opening and closing cycle tests.
High & Low Temperature Test Chamber
Verifies valve performance and stability under extreme temperature conditions.
High Temperature Aging Test Chamber
Assesses long-term material stability and product reliability under continuous high-temperature exposure.
Desktop SPECTRO Optical Emission Spectrometer (Germany)
Performs rapid and accurate material composition analysis to ensure full material traceability and compliance.
Our engineering team evaluates these factors to ensure long-term reliability and regulatory compliance.
ISO9001:2015
ISO9001:2015
Environmental Management System Certification
Occupational Health & Safety Management System Certification
Certificate of Quality System Approval
ScheduleTo Certificate No HPiVS-iP1001-062-Q-10-00
CEPTUфNKAT COOTBETCTBNа
EAC
Certificate of Authority to use the Official APl Monogram
Certificate of Authority to use the Official APl Monogram
Certificate of Authority to use the Official APl Monogram
Certificate of Authority to use the Official APl Monogram
Certificate of Authority to use the Official APl Monogram
ISO 15848－1 QUALIFICATION CERTIFICATE
Test Report
Check valves automatically prevent reverse flow, protecting pumps, compressors, pipelines, and other equipment.
The valve opens automatically when fluid flows in the correct direction and closes when flow reverses, preventing backflow.
Swing check valves are suitable for general service, dual plate valves are compact and lightweight, while axial flow valves minimize pressure loss and reduce water hammer.
Q How do I choose the right check valve?
Selection depends on flow conditions, pressure, temperature, installation orientation, and the type of process media.
Q Can check valves reduce water hammer?
Yes. Dual plate and axial flow check valves are specifically designed to reduce water hammer through faster closing action.
Q Which industries commonly use check valves?
Check valves are widely used in oil & gas, water treatment, chemical processing, power generation, HVAC, and marine industries.
Hangzhou Kaiwei Valve Group Co, Ltd, established in 2015, is a cutting-edgeindustrial enterprise that specializes in the R&D, design, casting, production,and sales of fluid control products and services
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