Check Valve

Check valve series covers API American Standard, energy-saving silent type, lift type, and vertical lift type structures, suitable for applications ranging from general industrial to harsh conditions such as oil & gas, chemical, and power generation. Body materials include carbon steel, stainless steel, cast iron, bronze, and more. Sealing options include metal-to-metal or elastomeric seals, meeting various pressure, temperature, and media requirements. Products comply with API, ASME, BS, ISO and other international standards.

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Core Advantage

Multiple structure types: API American Standard heavy-duty, energy-saving silent, lift type, vertical lift type – adaptable to different installation orientations and working conditions
Reliable backflow prevention: Disc opens and closes automatically, closes by gravity or spring assistance – achieving zero reverse flow protection
Energy-saving & silent: Slow-closing mechanism reduces water hammer, noise ≤ 60 dB, low pressure drop reduces pump system energy consumption
High pressure & high temperature resistance: Pressure up to Class 2500 (~4500 psi), temperature up to 650°C; cryogenic version down to -196°C
Excellent sealing performance: Metal-to-metal (Stellite hard-facing) or elastomeric seals (PTFE/EPDM/NBR/Viton) – extremely low leakage
Compact structure: Few moving parts, low failure rate, easy installation and maintenance
Rich material selection: Carbon steel (WCB), stainless steel (304/316L), alloy steel, cast iron, bronze, brass, PVC
Flexible installation: Supports horizontal or vertical (flow upward) installation; connection types include flanged, threaded, butt-weld, socket-weld, wafer

Application

Installed at pump outlets or on vertical pipelines to prevent media backflow when pumps stop or during pressure fluctuations, protecting pumps, compressors, and other equipment. Suitable for steam systems, water supply networks, fire protection systems, and chemical processes; selected models effectively reduce water hammer and operational noise.

Technical Parameters

Parameter	Range
Port Size	1/4″ – 48″ (DN6 – DN1200)
Pressure Rating	Class 150 – Class 2500 (PN10 – PN420)
Temperature Range	-196°C to 650°C (depending on material and seal type)
Body Materials	Carbon steel (WCB), stainless steel (304/316L), alloy steel, cast iron, bronze, brass, PVC
Disc / Seat Materials	Stainless steel + hard-facing alloy (Stellite), PTFE, rubber-coated
Seal Type	Metal-to-metal, elastomeric (EPDM/NBR/Viton/PTFE)
Connection Types	Flanged, threaded (NPT/BSP), butt-weld, socket-weld, wafer
Installation Orientation	Horizontal (lift type), vertical flow upward (vertical lift type)
Noise Level	Energy-saving silent type ≤ 60 dB
Design Standards	API 594, API 6D, ASME B16.34, BS 1868, BS EN 12266, AWWA C508, ISO 15761