Category
Classified by Materials

Valves Shell material
Besides it's standard material ASTM A216 (WCB), DAV cast steel valves are optionally available with the materials listed below :
Working Temperature ℉(℃) Standard if materials
Material Designation ASTM Spec. JIS
Over 23 (-5) up to 800 (427) Corbon Steel A216 WCB SCPH 2
850 (454) C - ½ Mo A217 WC1 SCPH 11
*1100 (593) 1 ¼ Cr - ½ Mo A217 WC6 SCPH 21
2 ¼ Cr - 1 Mo A217 WC9 SCPH 32
*1200 (650) 5 Cr - ½ Mo A217 C5 SCPH 61
9 Cr - 1 Mo A217 C12  
Down to -50 (-46) Carbon Steel A352 LCB SCPL1
Carbon Steel A352 LCC  
- 75 (- 59) C - ½ Mo A352 LC1 SCPL 11
- 100 (- 73) 2 ½ Ni A352 LC2 SCPL 21
- 150 (- 101) 3 ½ Ni A352 LC3 SCPL 31
*Over -320 (-196) up to 1500 (815) 18 Cr - 8 Ni (Co 0.03) A351 LC3 SCS 19
18 Cr - 8 Ni (Co 0.08) A351 CF8 SCS13
18 Cr - 8 Ni - 2 Mo(Co 0.03) A351 CF3M SCS16
18 Cr - 8 Ni - 2 Mo(Co 0.08) A351 CF8M SCS 14
18 Cr - 10 Ni - Cb A351 CF8C  
300 (149) 19 Cr - 29 Ni A351 CN7M  

*For welding ended valves only end ratings terminate at 1000℉
** Refer to ASME/ANSI B16.34 for details of A216,A217, A351 and A352.
    Pressure-Temperatureratings.
    The minimum working temperatres of ASTM A352 are based on ASME B31.3.


Valves trim material 
Valve trim
The trim is comprised of the following :
DESCRIPTION Gate. Valve Globe Valve Check Valve
Body seat surface
Disc seat surface
Stem(Hinge Pin) -
Bonnet bush(Baclseat) -
Others Small internal parts Small internal parts Small internal parts
Specified by API 600/BS 1414 BS 1873 BS 1868

Trim material
Following trims specified in API 600, Table 3, are available from DAV either as our standard or at your option.
Trim No.
Symbol
Nominal trim Body Seat surface* Disc Seat surface* Stem(hinge pin)
and bonnet bush
 
01 F6 13Cr 13Cr 13Cr  
02 304 18Cr - 8Ni 18Cr - 8Ni 18Cr - 8Ni Available
optionally
05 Hardfaced(HF) Stellite#6 Stellite#6 13Cr  
08 F6 & HF Stellite#6 13Cr 13Cr  
09 Monel Ni- Cu Alloy Ni- Cu Alloy Ni- Cu Alloy Available
optionally
10 316 18Cr - 10Ni - 2Mo 18Cr - 10Ni - 2Mo 18Cr - 10Ni - 2Mo
11 Monel & HF Stellite#6 Ni- Cu Alloy Ni- Cu Alloy
12 316 & HF Stellite#6 18Cr - 10Ni - 2Mo 18Cr - 10Ni - 2Mo
13 Alloy20 19Cr - 29Ni 19Cr - 29Ni 19Cr - 29Ni
14 Alloy20 & HF Stellite#6 19Cr - 29Ni 19Cr - 29Ni


General specificaion and standards
VALVE TYPE GATE GLOBE CHECK
 Shell wall thickness API 600 API 600 API 600
 General valve design specifications BS 1414 BS 1873 BS 1868
 Pressure-Temperature ratings ? ASME/ANSI B16.34
 Face to face or end to end dimensions ? ASME B16.10
 End flange dimensions Gasket contact facing?  Size 2~20", 24" ? ASME/ANSI B16.5
????? 22" ? MSS SP - 44
????? 22" and larger ? ASME B16.47 Ser A (MSS SP-44) or B (API 605)
 Finishes for contact face of RF ? ASME/ANSI B16.5
 Buttwelding end dimensions ? ASME B16.25
 Inside diameter of flanged end minimum ? ASME/ANSI B16.34
 Bolt and nut, thread ? ASME/ANSI B1.1,? B18.2.1,? B18.2.2?
 Material of shell, trim, bolt, nut, and others ? API 600, ASTM Respective specification
 Marking system ? MSS SP - 25
Test and Inspecton  Chemical composition analysis ? Relevant? ASTM
 Mechanical property test ? Relevant? ASTM/ASTM A370
 Pressure test ? API 598, BS 5146 and ASME/ANSI B16.34
 Radiographic inspection ? ASME/ANSI B16.34,? ASTM E142/E94
 Wet magnetic particle inspection ? ASME/ANSI B16.34,? ASTM E709/A275
 Liquid penetrant inspection ? ASME/ANSI B16.34,? ASTM E165
 Low temperature impact test ? ASTM A352/E23
 Dimensional inspection ? Relevant valve standards
 Visual inspection ? MSS SP - 55


Nace valves
For servicing sour gases or other Hydrogen Sulfide bearing hydrocarbon fluids, DAV offers NACE valves made of component material specially heat-treatment and hardness controlled in conformity with NACE MR-01-75 standard.
Typical NACE material configuration is shown below for DAV cast carbon steel gate valves. A note should be taken on the fact that NACE hardness requirment conflicts with the one of valve seating surface specified by API600, Table 3. DAV NACE valves are available only at your option.
VALVE PARTS ASTM SPECIFICATION NACE HARDNESS API 600 HARDNESS
Body / bonnet A216 WCB Max. HRC 22
HB 237
Disc A216 WCB or AISI Type 410
Disc seat surface 13Cr deposit or AISI Type 410 Min. 300 HB
Body seat ring? A105 or AISI Type 410
Body seat ring surface Hardface
Stem AISI Type 410 Max. HRC 22
HB 237
200~275 HB
Bonnet bush Min. 250 HB
Packing gland
Lantern ring
Bonnent bolts A193 B7
A193 B7M Max. HRC 22 (HB 237)
Bonnet nuts A194 2H
A194 2M Max. HRC 22 (HB 237)