01
Bolted Bonnet Gate Valve
Technical Requirement
Design - WELCO cast steel gate valves are designed and manufactured to provide maximum service life and dependability. All gate valves are full ported and meet the design requirements of American Petroleum Institute standard API600 & API 6D, British standard BS1414& BS EN 1984 and generally, conform to American Society of Mechanical Engineers standard ASME B16.34. Valves are available in a complete range of body/bonnet materials and trims.
Rang of materials - Standard body/bonnet materials include nine grades of cartoon, low alley and stainless steels. For special applications they can be supplied in other grades of alloy and stainless steel. There's a full range of trim materials to match any service .optional packing and gasket materials are available for a full rangof service conditions.
Design description
Nominal diameter: NPS 2”～48”(DN50～DN1200)
Operating temperature: -196℃～593℃(the range of service temperature may vary for different materials)
Nominal pressure: CLASS 600～2500 （PN100～PN420）
Material Main material: A216 WCB、WCC; A217 WC6、WC9、C5、C12、C12A、CA15; A351 CF8、CF8M、CF3、CF3M、 CF8C、CN3MN、CK3MCUN、CN7M; A352 LCB、LCC; A494 CW-6MC、CU5MCuC、M35-1; A890 4A(CD3MN)、 5A(CE3MN)、6A(CD3MWCuN); ASME B 148 C95800、C95500, etc.
Design standard: ASME B16.34、API 600、GB/T 12234、GB/T 12224
Structural length: ASME B16.10、GB/T 12221, EN558-1
Connecting end: ASME B16.5、ASME B16.47、ASME B16.25、GB/T 9113, EN 1092-1
Test standard: API 598、ISO 5208、GB/T 26480、GB/T 13927
Standard Material Specifications
| No | Part Name | ASTM Material | |||||||
| Carbon steel | 1.25Cr-0.5Mo | 2.25Cr-1Mo | 304 Type | 316 Type | 304LType | 316LType | 20 Alloy | ||
| 1 | Body | A216 WCB | A217 WC6 | A217 WC9 | A351 CF8 | A351 CF8M | A351 CF3 | A351 CF3M | A351 CN7M |
| 2 | Bonnet | A216 WCB | A217 WC6 | A217 WC9 | A351 CFS | A351 CF8M | A351 CF3 | A351 CF3M | A351 CN7M |
| 3 | Wedge | WCB+13CF1 | A217 WC6+HF | A217 WC6+HF | A351 CF8 | A351 CF8M | A351 CF3 | A351 CF3M | A351 CN7M |
| 4 | Stem | A182 F6A | A182 F11 | A182 F22 | A182 F304 | A182 F316 | A182 F304L | A182 F316L | 20-AIIoy |
| 5 | Seat Ring | A105+13Cr*1 | A182 F11+HF1 | A182 F22+HF | NA | NA | |||
| 6 | Back Seat | A276 410 | A276 410 | A276 410 | NA | NA | |||
| 7A | Bonnet Gasket | 304+Graphite | 304+Graphite | 304+Graphite | 304+Graphite | 316+Graphite | 304L+Graphite | 316L+Graphite | 316+Graphite |
| 7B | Ring Gasket | Soft Steel | A182 F304 | A182 F304 | A182 F304 | A182 F316 | A182 F304L | A182 F316L | 20-AIIoy |
| 8 | Bonnet Bolt | A193 B7 | A193 B7 | A193 B16 | A193 B8 | A193 B8M | A193 B8 | A193 B8M | A193 B8M |
| 9 | Bonnet Nut | A194 2H | A1977 | A194 7 | A1948 | A1948M | A194B | A1948M | A1948M |
| 10 | Packing | Graphite | Graphite | Graphite | Graphite *2 | Graphite *2 | Graphite*2 | Graphite*2 | Graphite*2 |
| 11 | Gland | A276 410 | A276 410 | A276 410 | A276 304 | A276 316 | A276 304L | A276 316L | 20-AIIoy |
| 12 | Gland Flange | A216 WCB | A216 WCB | A216 WCB | A351 CF8 | A351 CF8 | A351 CF8 | A351 CF8 | A351 CF8 |
| 13 | Eyebolt | Carbon Steel | A193 B7 | A193 B7 | A193 B8 | A193 B8 | A193 B8 | A193 B8 | A193 B8 |
| 14 | Eyebolt Nut | Carbon Steel | A194 2H | A194 2H | A1948 | A1948 | A1948 | A1948 | A1948 |
| 15 | Eyebolt Pin | A276 410 | A276 410 | A276 410 | A276 304 | A276 304 | A276 304 | A276 304 | A276 304 |
| 16 | Grease Fitting | Commercial | Commercial | Commercial | |||||
| 17 | Stem Nut | Bronze*3 | Bronze | Bronze | |||||
| 18 | Jam Nut | Carbon steel | Carbon steel | Stainless Steel | |||||
| 19 | Hand Wheel | Malleable iron | Malleable iron | Malleable iron | |||||
| 20 | Wheel Nut | Carbon steel | Carbon steel +Zn | Carbon steel+ZN | |||||
| *1 | PN100/CLASS 600 or higher pressure sealing face will be HF | ||||||||
| *2 | PTFE Optional | ||||||||
| *3 | Ductile Ni-Resist iron Optional | ||||||||
| NA | Integral with body | ||||||||