A105N Flanged Lift Check Valve 900Lb

CAST VALVE SERIES

 GATE VALVE

 GLOBE VALVE

 CHECK VALVE

 BALL VALVE

 BUTTERFLY VALVE

FORGED VALVE SERIES

 FORGED GATE VALVE

 FORGED GLOBE VALVE

 FORGED CHECK VALVE

INDUSTRIAL STRAINER SERIES

 Y TYPE STRAINER

 BASKET STRAINER

 T TYPE STRAINER

 TEMPORARY STRAINER

 FORGED STRAINER

 STRAINER SCREEN & BASKET

LATEST PRODUCTS

Carbon Steel A105N 900Lb Flanged Lift Check Valve - RF, RTJ Ends

Tengs Valve supplies high-quality Carbon Steel A105N 900Lb Flanged Lift Check Valves (also called Piston Check Valves) manufactured to API 602 standards. These forged steel lift check valves feature bolted bonnet, plug disc, and flanged ends (RF, RTJ). Available in sizes 1/2″ to 2″ (DN15 to DN50) with pressure rating ANSI Class 900LB (15.0 MPa). Body material is forged carbon steel A105N, with trim options in Trim 1#, 5#, 8#, 13Cr, or stainless steel. Ideal for high-pressure oil & gas, petrochemical, power generation, and instrument lines requiring fast closing and tight sealing in small-bore high-pressure service.

A105N 900Lb Lift Check Valve Specifications

• Type of Valve: Check Valve, Lift Type, Piston Type

• Type of Connection: Flange End, RF, RTJ

• Type of Disc: Plug Disc

• Size Range: 1/2″ to 2″ (DN15 to DN50)

• Working Pressure: Class 900LB, 15.0 MPa

• Body Material: Carbon Steel, Forged Type, A105N

• Trim Material: Trim 1#, 5#, 8#, 13Cr, or Stainless Steel

• Bonnet Type: Bolted Bonnet, Bolted Cover

• Design & Manufacture: API 602, BS 5352, ASME B16.34

• Face to Face: ANSI B16.10

• Flange Dimensions: ANSI B16.5

• Inspection & Test: API 598

• Other materials and pressure ratings on request.

✓ Lift (Piston) type provides faster closing and tighter sealing than swing type — ideal for high-pressure small-bore service requiring zero leakage

Lift (Piston) Type vs Swing Type Check Valve

Parameter	Lift (Piston) Type	Swing Type
Disc Movement	Piston moves along flow axis	Disc swings on hinge pin
Closing Speed	Fast (short stroke)	Slower (longer swing)
Leak Tightness	Tighter (guided disc)	Good
Pressure Drop	Higher	Lower (full bore)
Installation	Horizontal or vertical upward	Horizontal (recommended)
Typical Application	High-pressure small-bore, instrument lines	Larger sizes, pipeline service

Reference: API 602, BS 5352. Lift (Piston) type is preferred for high-pressure small-bore service (NPS 1/2 to NPS 2) requiring fast closing and tight sealing; Swing type is preferred for larger sizes and lower pressure drop.

RF (Raised Face) vs RTJ (Ring Type Joint) Flange Facing

Parameter	RF (Raised Face)	RTJ (Ring Type Joint)
Sealing Method	Flat/spiral gasket on raised face	Metal ring gasket in machined groove
Pressure Range	Class 150 to 900	Class 600 to 2500
Sealing Integrity	Good	Excellent (metal-to-metal)
Reusability	Gasket can be reused	Ring gasket typically replaced
Typical Application	General high-pressure service	Class 900+ critical HP service, wellhead

Reference: ASME B16.5. For Class 900 flanged lift check valves, both RF and RTJ are available. RTJ is recommended for critical high-pressure service where zero leakage is essential.

A105N 900Lb Lift Check Valve Material List

Part Name	Material (A105N)
Part Name	Body	A105N (Forged Carbon Steel)
Bonnet / Cover	A105N (Forged Carbon Steel)
Disc (Plug)	13Cr / STL / SS304 / SS316
Seat	13Cr / STL / SS304 / SS316
Guide	A182 F6a / SS304 / SS316
Spring	SS304 / Inconel X-750
Bolts / Nuts	A193 B7 / A194 2H
Gasket	Graphite / PTFE / RTJ Ring
Packing	Graphite / PTFE

Reference: API 602, BS 5352, ASTM A105. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.

A105N 900Lb Flanged Lift Check Valve Applications

• Oil and Gas Industry: High-pressure wellhead equipment, Christmas trees, manifold and flowline backflow protection.

• Power Generation: High-pressure steam trap isolation, boiler drains, turbine bypass auxiliary lines.

• Petrochemical: Hydrocarbon processing, catalytic cracking, reagent feed lines at Class 900.

• Chemical Processing: High-pressure corrosive fluid backflow prevention, dosing systems.

• Water Treatment: High-pressure pump discharge, desalination, boiler feed water.

• Instrumentation: High-pressure instrument root valves, sensing line isolation.

FAQ - Carbon Steel A105N 900Lb Flanged Lift Check Valve

Q1: What is a lift check valve and how does it work?

A: A lift check valve (also called piston check valve) uses a piston or plug disc that moves along the flow axis. When forward flow enters, the piston lifts off the seat; when flow stops or reverses, the piston drops back onto the seat to close. This design provides fast closing and tight sealing, making it ideal for high-pressure small-bore service. The guided piston ensures the disc returns to the same position every time, providing reliable leak tightness.

Q2: What is the difference between A105N and A105?

A: A105N is the normalized version of ASTM A105 forged carbon steel. The normalization heat treatment refines the grain structure, resulting in better impact toughness, more uniform hardness, and a lower ductile-to-brittle transition temperature. A105N is preferred for high-pressure Class 900 and above forged valve bodies, especially in sour service and low-temperature applications. A105 (as-forged) is suitable for general forged valve service at moderate pressure and temperature.

Q3: What is the difference between lift type and swing type check valves?

A: Lift (Piston) type uses a piston that moves along the flow axis, providing fast closing and tight sealing — ideal for high-pressure small-bore service (NPS 1/2 to NPS 2). Swing type uses a hinged disc that swings on a hinge pin, providing lower pressure drop — suitable for larger sizes and pipeline service. For Class 900 flanged small-bore service, lift type is generally preferred due to its faster closing and tighter sealing characteristics.

Q4: When should I use RF or RTJ flanges for Class 900?

A: RF (Raised Face) uses a flat or spiral wound gasket on a raised face, suitable for Class 150 to 900 general service. RTJ (Ring Type Joint) uses a metal ring gasket seated in a machined groove, providing metal-to-metal sealing for Class 600 to 2500 critical service. For Class 900 flanged lift check valves, both are available. RF is preferred for general high-pressure service; RTJ is recommended for critical high-pressure service where zero leakage is essential, such as wellhead equipment and gas injection systems.

Q5: What trim materials are available for A105N 900Lb lift check valves?

A: Standard trim options include Trim 1# (13Cr), Trim 5# (Stellite), Trim 8# (13Cr + Stellite), and stainless steel (SS304, SS316). Trim selection depends on the media, temperature, and erosion/corrosion conditions. For high-pressure steam and erosion service, Stellite hard-facing (Trim 5#) is recommended. For corrosive media, stainless steel trim (SS304 or SS316) is preferred.

Q6: Is NACE MR 0175 available for sour service?

A: Yes, NACE MR 0175 compliance is available on request for sour service applications. This includes material selection, hardness control, and testing requirements to ensure resistance to sulfide stress cracking. A105N forged carbon steel with appropriate trim and hardness control is commonly used for sour service Class 900 lift check valves. Please specify NACE MR 0175 in your inquiry.