Payment & Shipping Terms:
|Body Material:||Cast Steel:Carbon Steel, Stainless Steel, Duplex Stainless Steel||Trim:||13Cr, Half Stellite/ Full Stellite, SS304, SS316, Dss Etc.|
|Size:||2in - 36in||Pressure Rating:||Class 150LB - 2500LB|
|Actuator:||Handwheel, Gear Operated, Electric Actuator, Or Bare Stem||Connection Ends:||FF, RF, RTJ, BW|
|Painting:||As Per Staindards||Other:||OEM Available|
Industrial API Cast Steel Gate Valve Metal Seat Fully Open Z40H for Oil and Gas Industry.
Design and Manufacture: Cast steel gate valve to API 600 or API 6D;
Inspection and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B16.5 (for NPS≤24),API 605 or ASME B16.47 series A,MSS SP-44 (for NPS > 24).
BW end dimension: ASME B16.25.
Socket-weld dimension: ASME B16.11.
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.
2. Bonnet Gasket Style
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.
3. Packing Seal
As usual, flexible graphite is used for packing matorial. PTFE or combined packing material can be also used if being roquostod by tho customer. The surface roughness belween the packing and packing seal is Ra 3.2 μm, so thal the slem contact the packing surface tightly but rotate freely. The roughness of stem sealing face is Ra 0.8 μm after being precisely machined to ensure the reliable tightness.
4. Body and Bonnet Connection
Class 150 ~ Class 900 gate valves are usually connected with bolted bonnet design.
Class 1500 ~ Class 2500 gate valves usually adopt pressure seal bonnet design.
Hand wheel or bevel gear box is usually used for gate valve operation. Chain wheel and electric actuator also can be used for gate valve operation if being requested by the customers.
6. Disc Design
NPS≥2 Gate valves are flexible wedge gate, NPS<2 Gate valves are solid wedge gate.
7. Backseat Design
All gate valves have backseat 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 be machined after welding. When the gate valve is at fully open position, the sealing of backseat can be very reliable.
8. Stem Design
The stem is integral forged design. The minimum diameter of the stem shall be as per the standard requirement. The connection of the stem and disc is T type. The strength of the connecting area is bigger than that of the T threaded part of the stem. The strength test of that area conforms to API 591.
9. Stem Nut
Usually, the stem nut is made of ASTM A439 D2. It is also can be made of copper alloy or other materials if being requested by the customer. For large sized gate valves (NPS ≥10 Class 150, NPS ≥8 Class 300, NPS ≥6 Class 600, NPS≥ 5 for Class 900), rolling bearing is fitted between stem nut and stem in order to minimize the torque for easy operation.
For carbon steel gate valve, the seat is usually forged steel. The seat sealing surface is overlaying welded with hard alloy specified by the
customer. Renewable threaded seat is used for NPS≤10 gate valves, and welded on seat also can be optional if being requested by the customer. Welded on seat is used for NPS≤12 carbon steel gate valves. For Stainless steel gate valve, the seat is integral with body, or it can be machined directly after hard alloy welded. Threaded or welded type seat is also optional for stainless steel gate valve.
|Parts No.||Parts Name||Materials|
|WCB/Trim 1||WCB/Trim 5||WCB/Trim 8||CF8/304||CF8M/316|
|1||Body||ASTM A216 WCB||ASTM A216 WCB||ASTM A216 WCB||ASTM A351 CF8||ASTM A351 CF8M|
|2||Gasket||Sofl Iron + Graphite or 304 + Graphite||304 + Graphite||316+Graphite|
|3||Seat Ring||A105+ 13Cr||A105 + STL||A105 + STL||ASTM A351 CF8||ASTM A351 CF8M|
ASTM A216 WCB
|ASTM A216 WCB +STL||
ASTM A216 WCB + 13CR
|ASTM A351 CF8||ASTM A351 Cr8M|
|b||Stem||ASTMA182F6a||ASTM A182F6a||ASTM A182F6a||ASTM A182 F304||ASTM A182 F316|
|6||Backseat Bushing||ASTM A182 F6a||ASTM A182 F6a||ASTM A182 F6a||ASTM A351 CF8||ASTM A351 CF8M|
|8||Gland||ASTM A182 F6a||ASTM A182F6a||ASTM A182F6a||ASTM A182 F304||ASTM A182 F316|
|9||Gland Eyeboit||ASTMA193 B7||ASTMA193 B7||ASTM A193 B7||ASTMA193 B8||ASTM A193 B8M|
|10||Eyebolt Nut||ASTMA194 2H||ASTM A194 2H||ASTM A194 2H||ASTM A194 8||ASTM A194 8M|
|11||Eyebolt Pin||ASTM A36||ASTM A36||ASTM A36||304SS||316SS|
|12||Gland Flange||ASTM A216 WCB||ASTM A216 WCB||ASTM A216 WCB||ASTM A351 CF8||ASTM A351 CF8M|
|13||Bonnet Bolt||ASTM A193 B7||ASTM A193 B7||ASTM A193 B7||ASTM A193 B8||ASTM A193 B8M|
|14||Bonnet Nut||ASTM A194 2H||ASTM A194 2H||ASTMA194 2H||ASTM A194 8||ASTM A194 8M|
|15||Bonnet||ASTM A216WCB||ASTM A216 WCB||ASTM A216 WCB||ASTM A351 CF8||ASTM A351 Cf-8M|
|16||Nipple||Carbon steel||Carbon steel||Carbon steel||Carbon steel||Carbon steel|
|17||Stem nut||ASTM A439 D2||ASTM A439 D2||ASTM A439 D2||ASTM A439 02||ASTM A439 D2|
|18||Yoke Sleeve Nut||Carbon steel||Carbon steel||Carbon steel||Carbon steel||Carbon steel|
|19||Hand Wheel||Ductile Iron||Ductile Iron||Ductile Iron||Ductile Iron||Ductile Iron|
|20||Hand Wheel Nut||Carbon steel||Carbon steel||Carbon steel||Carbon steel||Carbon steel|
|21||Set Screw||ASTMA193 B7||ASTMA193 B7||ASTM A193 B7||ASTM A193 B7||ASTM A193 B7|