Tengs Valve International Limited
Tengs Valve International Limited Cast Steel, Forged Steel, Industrial Valves And Strainers
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Din Stainless Steel Flanged Gate Valve A351-CF8M Metal Seat Rising Stem with Handwheel
Description:
Gate valve is a valve which opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired. The gate faces can be parallel, but are most commonly wedge-shaped.
Quick Details:
1. Type: Din Gate Valves Stainless Steel
2. OS&Y, Bolted Bonnet, Solid or Flexible Wedge Design
3. Size Range: Dn50 to Dn600
4. Pressure Ratings: Pn16 - Pn64
5. Materials Available in: Cast Stainless Steel A351-CF8M
6. Various trim materials are available to suit different service conditions
7. Actuator: Manual, Handwheel
8. NACE MR 0175 on request
Standards
| Design Standard | DIN3352 |
| Face to Face | DIN3202 |
| Flange Ends | DIN2543-2545 |
| Test & Inspection | DIN3230 |
Features:
1. Bonnet Gasket Style
Stainless steel + flexible graphite combined gasket;
Stainless steel + flexible graphite wounded gasket;
Ring joint gasket;
2. Packing Seal
Flexible graphite is used for packing material. PTFE or combined packing material can be also used.
3. Body and Bonnet Connection
Bolted Bonnet design. (B.B)
4. Seat
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. 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.
5. Disc Design
NPS≥2 Gate valves are flexible wedge gate, NPS<2 Gate valves are solid wedge gate.
6. Backseat Design
All gate valves have backseat design.
7. Stem Design
The stem is integral forged design.
8. 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.
9. Operation
Hand wheel or bevel gear box is usually used for gate valve operation, electric actuator also can be used for gate valve operation if being requested by the customers.
1. Cast Stainless Steel Gate Valve Parts and Material List:
| Parts Name | Material | ||
| Stainless Steel A351-CF8 | Stainless Steel A351-CF8M | ||
| 1 | Body | DIN 17445 1.4308 | DIN 17445 1.4408 |
| 2 | Wedge | DIN 17445 1.4308 | DIN 17445 1.4408 |
| 3 | Stem | ASTM A182 F304 | ASTM A182 F316 |
| 4 | Nut | A194 8 | A194 8 |
| 5 | Bolt | A193 B8 | A193 B8 |
| 6 | Gasket | SS Spiral Wound W/graphite, or SS Spiral Wound W/ PTFE, or Reinforced PTFE | |
| 7 | Bonnet | DIN 17445 1.4308 | DIN 17445 1.4408 |
| 8 | Packing | Braided Graphite or Reformed Graphite Ring or PTFE | |
| 9 | Gland | ASTM A182 F304 | ASTM A182 F316 |
| 10 | Gland Flange | DIN 17445 1.4308 | DIN 17445 1.4408 |
| 11 | Stem Nut | Copper Alloy or A439 D2 | |
| 12 | Hand Wheel | Ductile Iron or Carbon Steel | |
2. Hydro Test Specifications:
| Nominal Pressure (MPa) | Shell Test (MPa) | Sealing Test(MPa) | Suitable Medium |
| 1.6 | 2.4 | 1.76 | Water, Oil & Gas |
| 2.5 | 3.75 | 2.75 | |
| 4.0 | 6.0 | 4.4 | |
| 6.4 | 9.6 | 7.04 |