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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Axial Check Valve – Technical Data Sheet

Size: DN80 | Pressure: PN40 | Connection: Flanged RF | Axial Flow Design

Item	사양
Product Name	Axial Flow Check Valve (Nozzle Type / Non‑Slamming)
공칭 크기	DN80
압력 등급	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
본체 재질	WCB (Carbon Steel) / CF8M (316 SS) / Ductile Iron
Disc / Trim	Stainless steel (CF8M) with optional Stellite hardfacing
밀봉	Metal‑to‑metal or soft seated (PTFE / NBR) optional
Spring Material	Stainless steel (316)
온도 범위	-29°C ~ +425°C (depending on materials)
Applicable Media	Water, steam, oil, gas, chemicals, petrochemicals

Main Parts & Materials

요소	Material (Standard)	Optional Material
몸	WCB (carbon steel)	CF8M (316 SS), CF3M (316L), Ductile Iron (GGG40)
Disc (Piston)	CF8M (316 SS)	CF8 (304 SS), duplex, with Stellite overlay
좌석	Integral with body, Stellite faced	PTFE insert (soft seated)
봄	316 SS	Inconel, Hastelloy
Guide / Shaft	316 SS	17‑4PH, Monel
Gasket	Spiral wound (SS + graphite)	PTFE, graphite sheet
Bolting	A193 B7 / A194 2H (for WCB body)	A193 B8 / A194 8 (for SS body)

Dimensions & Weight (Wafer Type – Reference)

Dimension	mm (approx.)	inch (approx.)
Face‑to‑Face (L)	65 – 75	2.56 – 2.95
Flange Compatibility	PN40 EN 1092‑1	–
Outer Diameter (flange OD)	200 (for PN40 DN80 flange)	7.87
Overall Length (including flanges)	depends on mating flanges	–
Weight (valve body only)	~6 – 10 kg	~13 – 22 lbs

Note: Wafer type axial check valves are installed between flanges. Face‑to‑face follows EN 558 Series 48 (basic series 48 for wafer check valves).

Axial Check Valve Design Features

Axial Flow Path – Streamlined, straight‑through design with minimal pressure drop compared to conventional swing or lift check valves.
Non‑Slamming Operation – Spring‑assisted disc returns to seat before flow reversal occurs, eliminating water hammer and noise.
Centre‑Guided Disc – Accurate alignment, low wear, and stable operation even at low flow velocities.
Compact Wafer Design – Short face‑to‑face length, lightweight, easy to install between existing flanges.
Bidirectional or Unidirectional – Standard design is unidirectional; optional double‑directional available.
Low Opening Pressure – Spring rate optimized for low cracking pressure (typically 0.02 – 0.05 MPa), suitable for pump protection.

Performance Characteristics

Characteristic	Value
Cracking Pressure	≤ 0.03 MPa (0.3 bar) for standard spring
Maximum Operating Pressure	4.0 MPa (PN40)
Maximum Operating Temperature	425°C (with graphite seals)
Leakage Rate	Zero leakage (soft seat) / Class IV (metal seat)
Flow Coefficient (Cv)	High – typically >0.8 x pipe Cv due to streamlined design

응용 프로그램

Pump discharge protection (water, oil, chemical pumps)
Boiler feedwater systems
Compressed air and gas lines
HVAC and district heating
Refining and petrochemical plants
Marine and offshore (with stainless steel body)

Testing & Compliance

Test	Standard / Requirement
Shell Test	1.5 × PN40 (6.0 MPa) – no leakage
Seat Test (low pressure)	0.6 MPa (6 bar) – per API 598
Seat Test (high pressure)	1.1 × PN40 (4.4 MPa) – zero leakage for soft seat
Hydrostatic strength	EN 12266‑1 / API 598
Material Traceability	EN 10204 3.1 (optional)
Marking	EN 19 / MSS SP‑25

Advantages Over Conventional Check Valves

Feature	Axial Check Valve	Swing / Lift Check Valve
Pressure drop	Very low	Moderate to high
Water hammer	Virtually eliminated	Common (disc slams)
Installation orientation	Horizontal or vertical (flow upward)	Usually horizontal
Cracking pressure	Low (0.03 MPa)	Higher (0.05 – 0.1 MPa)
Space required	Short face‑to‑face	Longer

Ordering Information

Please specify:

Valve size: DN80
Pressure rating: PN40
Connection type: Flanged RF
Body material: WCB / CF8M / Ductile Iron
Seat type: Metal / Soft (PTFE)
Spring material: 316 SS / Inconel
Special requirements: Low cracking pressure, high temperature (>400°C), NACE, etc.

Notes:

Axial check valves are bidirectional only if specially ordered; standard design is unidirectional (flow direction arrow on body).
Wafer type requires appropriate flange bolting length (longer than standard due to valve body thickness).
For high‑temperature steam service (above 350°C), a metal‑seated version with flexible graphite seals is mandatory.
Dimensions and weights are typical; confirm with manufacturer drawings.

보증:

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