| Design of Disc | |||
| Gate vlaves with NPS>2 are of flexible wedge gate;Gate valves with NPS <2 are of solid wedge gate. | |||
| The body and bonnet of Class 150~Class 900 gate valves are usually bolted bonnet design.And Class 1500~Class 2500 gate valves are usually of pressurized seal design. | |||
| Carbon steel or stainless steel+flexible graphite combined gasket is used for Class 150 gate valve；Stainless steel+flexible graphite wounded gasket is used for Class 300 gate valve;Stainless steel+flexible graphite wounded gasket is used for Class 600 gate valve ,and ring joint gasket is also optional for Class 600 gate valve;Ring Joint gasket is used for Class 900 gate valve;Pressurized seal design is used for Class 1500~Class 2500 gate valve. | |||
| Hand wheel or gear box is usually used for gate valve actuation .Chain wheel and electric actuator can be also used for gate valve actuatuo if being requested by the customers. | |||
| Molded flexible graphite is used for packing material .PTFE or combined packing material can be also used if being requested by the customers .The internal surface of the stuffing box ,of which area is contacted with the packing,is of excellent finish(Ra 3.2um).The stem surface ,contacting with the packing,should be rolled and pressed after being precisely machined,so as to reach to the high finish and compactness(Ra 0.8um)and ensure the reliable tightness of the stem area. Belleville Spring Loaded Packing Impacting System If being requested by the customer ,the Belleville spring loaded packing impacting system can be adopted for enhancing the durability and reliablity of the packing seal. | |||
| All our gate valves have the back seating design.In most cases,the carbon steel gate valve is fitted with a renewable back seat.For stainless steel gate valve,the back seat is machined directly in the bonnet or is machined after welding .When the gate valve is at fully open position ,the sealing of the back seat can be very reliable .However ,as per the requirement of API600,it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing. | |||
| For carbon steel gate valve ,the seat is usually forged steel.The sealing surface of the seat is spray welded with hard alloy specified by the customer.Welded seat is used for NPS<10 gate valves ,and welded on seat can be also optional if being requested by the customer.Welded on seat is used for NPS<10 carbon steel gate valves .for Stainless steel gate valve,intergral seat is usually adopted,or to weld hard alloy directly integrally.Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer. | |||
| Technical specification | |||
| Design standard: DIN 3356 API600 ANSI16.34 JIS GOST | |||
| Face to face dimension: ASME B16.10 | |||
| Flanged ends: ASME B16.5 | |||
| Test & inspection: API598 |
Technical specification
●Design Standard: API600 / BS1873
●Face To Face: ANSI B16.10
●Flange ends: ANSI B16.5
●Test & Inspection: API 598
| Performance Specifications | ||||
| Nominal Pressure | 150LB | 300LB | 600LB | |
| Shell Test | 3.0MPa | 7.5MPa | 15.0MPa | |
| Pressure | Seal Test | 2.2MPa | 5.5MPa | 11.0MPa |
| Test | Back Seal Test | 2.2MPa | 5.5MPa | 11.0MPa |
| AIRROOF | 0.6MPa | 0.6MPa | 0.6MPa | |
| Suitable Temperature | (-)29-425℃ | |||
| Suitable Medium | W.O.G | |||
| Size | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | |
| 150LB | 178 | 190 | 203 | 229 | 254 | 267 | 292 | |
| L | 300LB | 216 | 241 | 283 | 305 | 381 | 403 | 419 |
| 600LB | 292 | 330 | 356 | 432 | / | 559 | 660 | |
| 150LB | 152 | 178 | 190 | 229 | 254 | 279 | 343 | |
| A | 300LB | 165 | 191 | 210 | 254 | 279 | 318 | 381 |
| 600LB | 165 | 191 | 210 | 273 | 330 | 356 | 419 | |
| 150LB | 120.5 | 139.5 | 152.5 | 190.5 | 215 | 241.5 | 298.5 | |
| B | 300LB | 127 | 149 | 168 | 200 | 235 | 270 | 330 |
| 600LB | 127 | 149 | 168 | 216 | 266.5 | 292 | 349 | |
| 150LB | 92 | 105 | 127 | 157 | 186 | 216 | 270 | |
| C | 300LB | 92 | 105 | 127 | 157 | 186 | 216 | 270 |
| 600LB | 92 | 105 | 127 | 157 | 186 | 216 | 270 | |
| 150LB | 16 | 17.5 | 19 | 24 | 25 | 26 | 29 | |
| b | 300LB | 22 | 25 | 29 | 32 | 35 | 37 | 41 |
| 600LB | 26 | 29 | 32 | 38 | 45 | 48 | 56 | |
| 150LB | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | |
| f | 300LB | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
| 600LB | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | |
| 150LB | 4×19 | 4×19 | 4×19 | 8×19 | 8×22 | 8×22 | 8×22 | |
| N-φ | 300LB | 8×19 | 8×22 | 8×22 | 8×22 | 8×22 | 12×22 | 12×25 |
| 600LB | 8×19 | 8×22 | 8×22 | 8×25 | 8×30 | 12×29 | 12×32 | |
| 150LB | 386 | 435 | 483 | 587 | 673 | 767 | 955 | |
| H | 300LB | 417 | 460 | 526 | 650 | 694 | 824 | 987 |
| 600LB | 427 | 473 | 538 | 657 | / | 872 | 1101 | |
| 150LB | 200 | 200 | 250 | 250 | 300 | 300 | 350 | |
| W | 300LB | 200 | 250 | 250 | 250 | 300 | 350 | 450 |
| 600LB | 250 | 250 | 300 | 350 | / | 500 | 650 | |
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