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CB/T3943 SUS 316L SDNR Valve

CB/T3943 SUS 316L SDNR Valve

Item

Description

Product Name

CB/T3943 SUS 316L SDNR Valve

Certificates

ABS, LR, BV, DNV, RINA, CCS

FOB Price

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Warranty

12 months (unless otherwise specified)

Place of Origin

China

                        

Overview

1. PRODUCT OVERVIEW

The CB/T 3943-2002 Stainless Steel Flanged Stop Check Valve is a marine-grade valve that combines the functions of a stop valve and a check valve in a single compact body. It is designed to both regulate flow and automatically prevent backflow, ensuring the safe operation of shipboard piping systems. This standard is issued by the National Defense Science and Technology Industry Commission of the People's Republic of China and is applicable to liquefied gas carriers, bulk chemical carriers, and naval vessels, as well as other ship piping systems handling corrosive media.

The valve is available in two connection series: A/B type with flange dimensions per GB/T 569, and AS/BS type with flange dimensions per GB/T 2501. Structural length for A/B types follows GB/T 584-1999, while AS/BS types follow GB/T 11698-1989.

2. WORKING PRINCIPLE

The valve integrates a globe valve mechanism with a check valve function. The stem and disc move linearly to open or close the flow passage. When the handwheel is turned, the disc is lifted from the seat to allow flow. When flow reverses, the disc automatically seats against the seat ring, preventing backflow.

Key operational characteristics:

  • Combined function: Serves as both an isolation valve and a backflow preventer, reducing the number of components in the piping system.

  • Short stroke: The disc travel is relatively short, enabling quick opening and closing.

  • Reliable sealing: The disc and seat make contact only in the closed position, minimizing wear on sealing surfaces.

  • Flow direction: The flow direction is indicated by an arrow on the body. For PN ≤ 16 MPa, flow typically enters from below the disc; for PN ≥ 20 MPa, flow typically enters from above the disc to enhance sealing performance.

3. DESIGN & MANUFACTURING STANDARDS

STANDARDDESCRIPTION
CB/T 3943-2002Chinese Marine Industry Standard - Stainless Steel Flanged Stop Check Valves
GB/T 569-1965Ship flanges - Connection dimensions and sealing faces (for A and B types)
GB/T 2501-1989Ship flanges - Connection dimensions and sealing faces, four-position (for AS and BS types)
GB/T 584-1999Ship flanged cast steel stop valves (structural length for A and B types)
GB/T 11698-1989Ship flanges - Structural length for connecting metal valves (for AS and BS types)
GB/T 600-1991General technical requirements for ship piping valves
GB/T 1220-1992Stainless steel bars
GB/T 2100-1980Technical conditions for stainless acid-resistant steel castings
GB/T 3032Marking of ship piping accessories
CCS 1998China Classification Society - Materials and Welding Specifications

Design Standard: CB/T 3943-2002
Testing Standard: GB/T 600-1991

4. MATERIALS OF CONSTRUCTION

PART NAMEMATERIALSTANDARD
Body, Bonnet, DiscStainless Steel (ZG0Cr18Ni9 / ZG00Cr19Ni10 / ZG0Cr17Ni14Mo2)GB/T 2100-1980 or CCS 1998
Stem, FastenersStainless Steel (0Cr13 / 022Cr17Ni12Mo2)GB/T 1220-1992
Packing, GasketPTFE—
Sealing Surface (PN ≥ 4.0 MPa)Cobalt-Chromium-Tungsten Hard Alloy (Stellite)—

Note 1: The disc may be machined from forging materials.
Note 2: For 316L (022Cr17Ni12Mo2) construction, the body, bonnet, and disc are made of austenitic stainless steel with molybdenum content for enhanced corrosion resistance in chloride-bearing environments.

5. PRESSURE & TEMPERATURE RATINGS

TABLE 1 – MAXIMUM ALLOWABLE WORKING PRESSURE (MPa)

NOMINAL PRESSURE PN (MPa)≤ 20°C100°C150°C200°C250°C300°C350°CNOMINAL SIZE DN (mm)
1.0 (A, B)0.950.860.810.760.710.660.3665~150
1.6 (A, B)1.521.311.291.211.131.061.01125, 150
2.5 (A, B)2.382.152.011.891.771.661.5920~150
4.0 (A, B)3.803.443.223.022.832.652.5465~100
6.4 (A, B)6.095.505.164.834.524.244.1620~50
0.6 (AS, BS)0.570.520.480.450.420.400.3815~300
1.0 (AS, BS)0.950.860.810.760.710.660.63200~300
1.6 (AS, BS)1.521.311.291.211.131.061.01100~300
2.5 (AS, BS)2.382.152.011.891.771.661.5915~300
4.0 (AS, BS)3.803.443.223.022.832.652.5465~100
6.4 (AS, BS)6.095.505.164.834.524.243.9220~50

6. SIZE RANGE

PARAMETERRANGE
Nominal Size (DN)DN15 ~ DN500
Nominal Pressure (PN)0.6 MPa, 1.0 MPa, 1.6 MPa, 2.5 MPa, 4.0 MPa, 6.4 MPa
Design Temperature≥ -165°C

7. DIMENSIONS

TABLE 2 – BASIC DIMENSIONS FOR PN 1.0, 1.6, AND 2.5 MPa (TYPE A AND B) (Unit: mm)

PN (MPa)DNSTRUCTURAL L (A)STRUCTURAL L (B)H≈ (A)H≈ (B)WALL THICKNESS tFLANGE DFLANGE D1FLANGE D2FLANGE D3FLANGE bBOLT nBOLT Th.HANDWHEEL D0LIFT SWEIGHT (kg) AWEIGHT (kg) B
1.0652901153102776155123104—144M12140121814.5
1.0803101253453047170138118—144M12160142416.5
1.01003501503743258190158138—148M14180163025.5
1.01254001754263668215183164—1510M14200183642.7
1.01504801804874159240208190—1512M14220204457.7
1.61254001754654058225187168—1710M16250224445.4
1.61504801805244529255217196—1712M16280245758.9
2.52015075217203595684813124M1280874.5
2.525160802172035105735613124M1280975.1
2.532180852362165115836414124M12100996.2
2.540200902602365125937414134M1210011119.7
2.5502309528825861351038414134M12140121411.6
2.565290115335301615512310414144M14160141813.7
2.580310125366325717013811816148M16200172424.5
2.51003501504373788195158138161610M16250223333.6
2.51254001754934338220183164161612M16250224457.3
2.51505002005364868265208190161612M20280245767.3

TABLE 3 – BASIC DIMENSIONS FOR PN 4.0 AND 6.4 MPa (TYPE A AND B) (Unit: mm)

PN (MPa)DNSTRUCTURAL L (A)STRUCTURAL L (B)H≈ (A)H≈ (B)WALL THICKNESS tFLANGE DFLANGE D1FLANGE D2FLANGE D3FLANGE bBOLT nBOLT Th.HANDWHEEL D0LIFT SWEIGHT (kg) AWEIGHT (kg) B
4.065310125409374817513711814184M16200252230.2
4.080350140436394919015012816184M16200283038.1
4.0100400165466418922518115018208M20280243350.4
6.420160802612438100735113124M12100978.3
6.425180852732538110835814124M121009911.0
6.432200903042818125936615144M1412011913.1
6.44023010533431081401078416144M16140121217.4
6.45025011036432381551179616154M16160131523.3

TABLE 4 – BASIC DIMENSIONS FOR AS AND BS SERIES (PN 0.6, 1.0, 1.6, 2.5 MPa) (Unit: mm)

PN (MPa)DNSTRUCTURAL L (AS)STRUCTURAL L (BS)H≈ (AS/BS)WALL THICKNESS tFLANGE DFLANGE D1FLANGE D2FLANGE D3FLANGE bBOLT nBOLT Th.HANDWHEEL D0LIFT SWEIGHT (kg) ASWEIGHT (kg) BS
0.61513090—904805540—124M108083.94.0
0.620150952172034906550—124M108094.74.5
0.625160100——41007560—124M1210095.45.1
0.63218010523621651209070—144M12120116.96.6
0.640200115260236513010080—144M12120118.58.4
0.650230125288258614011090—144M121401211.110.8
0.6652901453353016160130110—144M141601418.117.7
0.6803101553663237190150128—164M161801722.321.9
0.61003501754373788210170148—168M162002034.434.1
0.61254002004934338240200178—168M162202245.244.8
0.61504802255364868265225202—168M162502457.757.5
1.020060027562154310320280258—188M202802698.398.1
1.025073032572162310375335312—208M2032030162.0156.0
1.030085037582169611440395365—228M2036034216.3214.4
1.620060027562154310320280258—208M2028026122.9121.1
1.625073032572162310375335312—228M2032030187.6186.8
1.630085037582169611440395365—248M2036034248.7248.6
2.520060027562154310320280258—228M2028026142.9143.9
2.525073032572162310375335312—248M2032030211.5212.6
2.530085037582169611440395365—268M2036034278.4280.7

TABLE 5 – BASIC DIMENSIONS FOR AS AND BS SERIES (PN 4.0 AND 6.4 MPa) (Unit: mm)

PN (MPa)DNSTRUCTURAL L (AS)STRUCTURAL L (BS)H≈ (AS/BS)WALL THICKNESS tFLANGE DFLANGE D1FLANGE D2FLANGE D3FLANGE bBOLT nBOLT Th.HANDWHEEL D0LIFT SWEIGHT (kg) ASWEIGHT (kg) BS
4.0652901454093748185145122—184M16200192237.6
4.0803101554303949200160133—184M16220222842.6
4.01003501754664169235190158—208M20280243454.1
6.4202301152612438130905814144M12100978.1
6.42523011527325381401006814144M121009911.0
6.43226013030428181551107816144M1612011913.1
6.44033015533431081701258816164M16140121221.7
6.450350175364323818013510216168M16160131527.2

Note: The bolt holes of the inlet and outlet flanges are positioned symmetrically along the centerline of the body.


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