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Backventil/Check Valve

Check valves
Or Non-Return Valves, are also Uni-Directional and
designed to stop backflow in the system.
Check Valves operate automatically by reaction to the fluid.
There are various types of Check Valves in our ANSI range.

Piston or Ball Check Valves are normally spring assisted to force
the Piston/Ball onto the seat for a better seal.
A low maintenance option with metal seats to limit the amount of wear.

Swing Checks become more standard for sizes 2” and upwards
where the valve bore is full and a Piston or Ball would become to
heavy for the fluid to lift.

Due to the disc’s resistance against flow, there is a relatively
large pressure drop.

Wafer Check Valves are also available, per API 594 design,
to fit between flanges.
Smaller in design and therefore cost effective the Wafer Check
is available with Metal or Soft Seats.

Forged Steel
Available in sizes ½” to 2” in ANSI Classes 150LB to 4500LB
Designed per EN ISO 15761, BS5352, API 602 and ASME B16.34
Ends Connections NPTF, SW, BW, RF and RTJ

Cast Steel
Available in sizes 2” to 36” in ANSI Classes 150LB to 2500LB
Designed per API 600, BS1868, API 594 and ASME B16.34
End Connections RF, RTJ or BW
Wafer Type in Dual Plate, Lugged, Double Flanged
WCB, LCC, CF3(M), CF8(M), WC1, WC6, C5, C12, CF8C, CN7M

Port design / flow passage.
Two designs are available:

  1. Conventional or reduced port. Port dimensions for gate valves are per
    API 602 and BS 5352.
    Port dimensions for Globe and Check valves are BS 5352.
  2. Standard or full port. Port dimensions are BS 5352 and are approximatly
    equal to the corresponding size of schedule 80 pipe inner diameter.

• Refineries, power stations, process and general industry
• For water, steam, gas, oil, and other media
• Other applications on request

Operating Data
• Maximum allowable pressure 2500 psi (172 bar)
• Maximum allowable temperature 1500 °F (816 °C)
• Pressure/Temperature ratings per ASME B16.34
• ASME Code Section VIII or ANSI B 31.3

• ASTM A105N: 0-400 °C
• ASTM A216 WCB: 0-475 °C

• ASTM A182 F1: 0-550 °C
• ASTM A182 F5: 0-649 °C
• ASTM A182 F9: 0-649 °C
• ASTM A182 F11 CL.2: 0-550 °C
• ASTM A182 F12 CL.2: 0-550 °C
• ASTM A182 F22 CL.3: 0-575 °C
• ASTM A217 WC1: 0-550 °C
• ASTM A217 WC6: 0-550 °C
• ASTM A217 WC9: 0-649 °C
• ASTM A217 C5: 0-649 °C
• ASTM A217 C12: 0-649 °C

• ASTM A350LF2: -46-350 °C)
• ASTM A352 LCB: -46-300 °C
• ASTM A352 LCC: -46-375 °C
• ASTM A352 LC3: -46-537 °C

• ASTM A182 F304L: -160-450 °C
• ASTM A182 F304: -160-750 °C
• ASTM A182 F321: -196-800 °C
• ASTM A182 F316L: -160-450 °C
• ASTM A182 F316: -160-750 °C
• ASTM A182 F347: -196-800 °C

• ASTM A351 CF8: -160-750 °C (304, UNSJ92600)
• ASTM A351 CF3: -160-750 °C (304L, UNS J92500)
• ASTM A351 CF8M: -160-750 °C (316, UNS J92900)
• ASTM A351 CF3M: -160-750 °C (316L, UNS J92800)
• ASTM A351 CF8C: -160-750 °C (347, UNS J92710)
• ASTM A351 CG8M: -160-750 °C (317, UNS J93000)
• ASTM A351 CG3M: -160-750 °C (317L, UNS J92999)
• ASTM A351 N-7M: (Hastelloy B, UNS J95150)
• ASTM A351 CK20: -160-750 °C (310, UNS J94202)
• ASTM A351 CT15C: -160-750 °C (Alloy 800, UNS N28820)
• ASTM A351 CN3MN (+Mod.)
• ASTM A351 CK3MCuN: (UNS J93254)
• ASTM A995 Gr.4A CD3MN: (UNS J92205, UNS32205)
• ASTM A890 Gr.1A CD4MCu: (UNS J93370, UNS31260)
• ASTM A890 Gr.6A CD3MWCuN: (UNS J93380, UNS32750)
• ASTM A890 Gr.5A CE3MN: (UNS J93404, UNS32750)
• ASTM A494 M-35-1: (Monel 400, UNS 24135)
• ASTM A494 CY 40: (Inconel 600, UNS NO6040)
• ASTM A494 N-12MV: (Hastelloy B, UNS N30012)
• ASTM A494 N-7M: (UNS N30007)
• ASTM A494 CW-12MW: (Hastelloy C276)
• ASTM A494 CW-12MW: (Hastelloy C276)
• ASTM A494 CX2MW: (UNS N26022)
• ASTM A494 Cw-6M: (UNS N30107, Hastelloy C276)
• ASTM A494 Cw-6MC: (UNS N26625, Incolloy 625)
• ASTM A494 CU5MCuC: (UNS N08826, Incolloy 825)

• ASTM A182 F44: -29-399 °C (6Mo, UNS 31254)
• ASTM A182 F51: -29-399 °C (UNS 31803 Duplex)
• ASTM A182 F53: -29-399 °C (UNS S32750 Super Duplex)
• ASTM A182 F54: -29-399 °C (UNS S32760 Super Duplex)

• ASTM B564, NO6600: -29-649 °C (Incolloy 600)
• ASTM B564, NO6625: -29-705 °C (Incolloy 625)
• ASTM B564, NO8800: -29-816 °C (Incolloy 800)
• ASTM B464, NO8020: -29-427 °C (UNS NO8020 Nickel-Alloy)
• ASTM B564, NO4400: -29-483 °C (Monel 400)

Temperature might be limited for butt weld ends only.
Table not exactly. Just as a guide.
Some values take from third party PMA, Particular Material Appraisel

Special materials also available: Duplex, Super Duplex, Monel,
Hastelloy, Titanium, Inconel, Incoloy, 6MO, Aluminium bronze

Special heat treatment such as stabilization can be done.

More material grades upon request

Trim Materials
• Trim 1 13Cr/13Cr
• Trim 2 304/304
• Trim 5 F6 HF, Full Stellite (Stellite 6/Stellite 6)
• Trim 8 F6 HFS, Half Stellite (13Cr/Stellite)
• Trim 10 316/316

For more trim alternatives. See pdf file to the right.
Trim Numbers Nordic Pipe AB.pdf

• Check valve design per BS1868
• Pressure/temperature rating per ASME B16.34, B 31.1, B31.3, MSS.SP 84
• Pressure/temperature rating per BS 5352 when valve design is not included
in API, ANSI or MSS standards for forged valves.
• End-end dimension per ASME B16.10
• Flange dimensions per ASME
B16.5, MSS SP44 B16.47 Serie A, Serie B, BS3293, (API 605)
• Butt Welding ends ANSI B 16.25
• Screwed ends NPT ANSI B1.20.1
• Socket weld ends ANSI B16.11
• Testing per API 598 and BS 6755
• Gasket facing MSS.SP. 6
• Back facing & spot facing MSS.SP. 9
• Inspection & test API 598 & MSS.S.P. 61
• Steel quality -Magnetic particle MSS.SP.53
• Steel quality -Radiographic MSS.SP.54
• Steel quality -Visual MSS.SP.55
• Critical areas ANSI B 16.34
• Definition of radiography classes ASTM E 71
• Sulfurous produce, Sour service NACE MR 01-75
• Marking MSS.SP. 25
• Dimension & flanges for thin wall valve MSS.SP.42
• Dimension for drains & by-pass MSS.SP.45
• Bolted bonnet
• Welded bonnet
• Pressure sealed bonnet
• Solid wedge
• Body/Bonnet gasket: Stainless steel/graphite gaskets,
Plain 316 insert/Graphite, Spiral wounded, Ring joint gasket

The valves meet the safety requirements of the Pressure Equipment Directive
97/23/EC (PED). CE marked.

Options on request
• Radiography
• Buttweld ends per ASME B16.25
• Switches
• Steam jacketing
• Position indicator electric
• Position indicator visual
• Leak test (Helium test)
• Colour marking
• Tag marking
• Special pipe connection lika clamp lock, special butt weld ends
• Modifications
• Other variants

On all enquiries / orders please specify
1. Valve Type
2. ANSI Pressure Class
3. Size
4. Design pressure
5. Design temperature
6. Differential Pressure-shut off
7. Flow Medium
8. Material of Construction
9. Trim Material (API Trim Number)
10. Type of End Connection
11. Pipe Schedule (for Buttweld Ends)
12. Options
13. Type, Series or Number
14. Valve Data Sheet if Applicable

When ordering spare parts, indicate valve part number
(shown on nameplate) and serial number.
Normally on handwheel nut.

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