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Check Valve
Home >> Products >> Check Valve >> Pressure-seal Swing Check Valve
Designed for high-pressure and high-temperature services, the Pressure-Seal Swing Check Valve combines the proven backflow protection of a swing check mechanism with a pressure-assisted body sealing system. The hinged disc opens with forward flow and closes automatically when the flow reverses, while increasing system pressure enhances the seal between the body and pressure-seal bonnet. This construction provides secure pressure containment for high-energy process systems.
The Pressure-Seal Swing Check Valve is particularly suited for power generation, steam systems, oil & gas, petrochemical, and other high-pressure process applications. Its pressure-seal construction, low flow resistance, and automatic reverse-flow protection make it a practical choice for boiler, turbine, feedwater, and high-energy piping systems where pressure containment and operational safety are critical.
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Product description: |
Pressure-seal Swing Check Valve |
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Model: |
H61H/Y Pressure-seal Swing Check Valve |
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Nominal diameter: |
NPS 2"~36" |
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Operating temperature: |
-196℃～593℃(the range of service temperature may vary for different materials) |
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Operating pressure: |
Class900Lb~2500Lb |
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Material: |
WCB、WCA、WCC、WC6、WC9、C5、C12、LCB、LCC、CF8、CF8M、CF3、CF3M、CN7M、CF8C |
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Design standard: |
BS 1868、ASME B16.34、API 6D |
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Structural length: |
ASME B16.10、API 6D、EN558 |
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Connecting end: |
ASME B16.5、ASME B16.47 |
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Test standard: |
API 598 |
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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.
Pressure-Assisted Body Seal
Internal pressure increases the sealing force at the pressure-seal bonnet, supporting effective containment as operating pressure rises.
Automatic Reverse-Flow Protection
The hinged disc responds to changes in flow direction without requiring an external actuator or power source.
Low Flow Resistance
The swing-disc arrangement allows the disc to move clear of the main flow path, helping maintain efficient fluid passage.
High-Pressure Capability
Pressure-seal construction is well suited to high-pressure systems where secure pressure containment is essential.
High-Temperature Service
Suitable for elevated-temperature steam and process fluids with appropriately selected materials and trim.
Reduced External Leakage Risk
The pressure-seal arrangement minimizes dependence on conventional bonnet gasket sealing, enhancing pressure-boundary integrity.
Controlled Disc Movement
Optional damping or counterweight arrangements can be incorporated to improve closing characteristics and reduce pressure surges.
Durable Internal Components
Robust disc, hinge, and seating components can be engineered for repeated cycling and demanding process conditions.
No External Actuation Required
Automatic operation reduces system complexity and eliminates the need for an actuator, control signal, or external power supply.
Suitable for High-Energy Systems
Well suited to main steam, boiler feedwater, turbine systems, power plant piping, and other high-pressure process services.
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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