RS Cast Iron Gate Valve Metal Seated
Description
TECHNICAL DATA SHEET
RISING STEM METAL SEATED GATE VALVE
Body Material: Ductile Iron (DI)
Seat Material: Bronze
Stem Material: Stainless Steel
Typical Size Range: DN50 – DN300 (2″ – 12″)
Typical Pressure Class: PN10 / PN16
End Connection: Flanged (EN 1092-1)
1. GENERAL DESCRIPTION
Rising stem, outside screw and yoke (OS&Y) pattern, bolted bonnet gate valve with metal-to-metal seating. The ductile iron body combines high strength with good corrosion resistance. Bronze seat rings are integrally cast or screwed into the body and wedge, providing galling resistance and reliable shut-off. The stainless steel stem with rising handwheel clearly indicates valve position. This design is suited for industrial water, steam, oil, and neutral fluid services where zero leakage (soft seats) is not mandatory but durable, high-cycle metal seating is required.
2. DESIGN FEATURES
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Rising stem / OS&Y – Stem threads are outside the pressure envelope, isolated from the medium, allowing easy lubrication and maintenance.
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Metal seated construction – Bronze seats on body and wedge ensure long service life under moderate temperature cycling and minimize pick-up compared to iron-on-iron seating.
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Ductile iron body & bonnet – Higher impact resistance and pressure/temperature capability than grey cast iron.
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Flexible wedge (optional solid wedge) – Flexible design compensates for body distortion and seat misalignment. Solid wedge available for high-temperature or highly viscous services.
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Backseat bushing – Permits replacement of stem packing while the valve is under pressure (full open position).
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Renewable seat rings – Body and disc seat rings can be replaced or reconditioned without removing the valve from the line (depending on size).
3. APPLICABLE STANDARDS
| Parameter | Standard |
|---|---|
| Design and Dimensions (Basic) | API 600 / ISO 10434 (steel gate valve structure, adopted for DI) or BS 5150 / EN 1171 (cast iron gate valves) |
| Face-to-Face | EN 558-1 Series 8 (short) or Series 15 (long) – to be specified |
| Flange Dimensions | EN 1092-1 PN16 / PN10 |
| Pressure-Temperature Ratings | Based on body material (DI) per EN 1092-1 / ASME B16.42 |
| Testing & Inspection | API 598 / ISO 5208 |
| Marking | EN 19 / MSS SP-25 |
4. TECHNICAL SPECIFICATIONS
| Parameter | Value / Description |
|---|---|
| Valve Type | Rising stem, bolted bonnet, metal seated gate valve |
| Nominal Size Range | DN50 to DN300 (larger sizes on request) |
| Nominal Pressure | PN10 (standard) or PN16 |
| Body / Bonnet Material | Ductile Iron (EN-GJS-500-7 / ASTM A536 Gr. 65-45-12) |
| Wedge (Disc) Material | Ductile Iron with bronze seat faces (solid or flexible wedge) |
| Seat Material | Bronze (e.g., C83600 / RG5), metal seated, renewable |
| Stem Material | Stainless Steel (AISI 410 / 420 or AISI 316) |
| Stem Seal / Packing | PTFE-impregnated graphite / Flexible graphite |
| Bonnet Gasket | Stainless steel + graphite spiral wound |
| Bolting | ASTM A193 B7 / A194 2H (zinc plated) |
| Operation | Handwheel (standard); gear operator for DN200 and above |
| Flow Direction | Uni-directional preferred (bi-directional upon request) |
| Leakage Class | Rate B or C per API 598 (metal seated) – zero leakage not attainable with metal seats |
5. MATERIALS OF CONSTRUCTION (Typical)
| Part No. | Component | Material |
|---|---|---|
| 1 | Body | Ductile Iron EN-GJS-500-7 / ASTM A536 65-45-12 |
| 2 | Bonnet | Ductile Iron EN-GJS-500-7 / ASTM A536 65-45-12 |
| 3 | Wedge (Disc) | Ductile Iron EN-GJS-500-7 or ASTM A395, with cast-in or screwed bronze seat rings |
| 4 | Body Seat Ring | Bronze C83600 / CuSn5Zn5Pb5 (RG5) |
| 5 | Stem | Stainless Steel AISI 410 / 420 (or 316 for corrosion) |
| 6 | Bonnet Gasket | Spiral Wound SS304 + Flexible Graphite |
| 7 | Packing | Graphite-based with PTFE or pure flexible graphite |
| 8 | Backseat Bushing | Stainless Steel 13Cr / 316 |
| 9 | Gland & Gland Flange | Ductile Iron or Steel (zinc plated) |
| 10 | Bolting | High-tensile steel, zinc plated or PTFE coated |
| 11 | Handwheel | Ductile Iron / Malleable Iron (hammer blow type optional) |
6. PRESSURE – TEMPERATURE RATING (DI Body, PN16)
| Temperature (°C) | Max. Working Pressure (bar) |
|---|---|
| -10 to 120 | 16.0 |
| 150 | 14.0 |
| 200 | 12.0 |
| 250* | 10.0 |
For continuous operation above 250 °C, special stem and packing materials are required. Bronze seating will progressively lose strength above ~230 °C; consult factory for steam service above 200 °C.
7. DIMENSIONS (For reference – EN 558-1 Series 8, PN16)
| Size DN | Face-to-Face L (mm) | Approx. Height H (open) (mm) | Handwheel Dia. (mm) | Approx. Weight (kg) |
|---|---|---|---|---|
| 50 | 178 | 290 | 200 | 15 |
| 80 | 203 | 380 | 250 | 28 |
| 100 | 229 | 450 | 300 | 42 |
| 150 | 267 | 620 | 355 | 75 |
| 200 | 292 | 770 | 400 (gear) | 130 |
| 250 | 330 | 920 | 500 (gear) | 210 |
| 300 | 356 | 1070 | 500 (gear) | 310 |
Dimensions are nominal and may vary depending on manufacturer’s design. For exact dimensions, request certified drawings.
8. TESTING & INSPECTION
| Test Type | Test Medium | Test Pressure | Acceptance Criteria |
|---|---|---|---|
| Shell Strength | Water | 1.5 × PN (e.g., 24 bar) | No visible leakage |
| Seat Closure (High Pressure) | Water | 1.1 × PN (e.g., 17.6 bar) | Per API 598 Rate B/C |
| Backseat Test (if applicable) | Water | 1.1 × PN | No leakage |
| Packing Leakage | Air / Water | As per test specification | No detectable leakage |
Standard testing is per API 598 / ISO 5208. EN 10204 3.1 material certificates, PMI, and additional NDE (UT, PT, RT) are available as optional extras.
9. AVAILABLE OPTIONS & ACCESSORIES
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Pressure Class: PN25 or PN40 with ductile iron (depending on size).
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Seating Material: Stainless steel overlay (seat on disc) for higher temperature or abrasive services.
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Stem Upgrade: Full 316SS or duplex stainless steel for corrosive environments.
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By-Pass Arrangement: Integral bypass for high differential pressure opening.
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Actuation: ISO 5210 mounting pad for electric or bevel gear actuators.
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Locking Device: Handwheel lockable in open/closed position.
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Certifications: EN 10204 3.1, NACE MR0175/ISO 15156 (for H₂S, with special materials), PED 2014/68/EU.
10. ORDERING INFORMATION
To receive an accurate quotation, please specify:
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Valve type: Rising Stem Metal Seated Gate Valve
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Nominal size (DN)
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Pressure class (PN10 / PN16)
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Body material: Ductile Iron
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Seat material: Bronze (metal seated)
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Stem material: Stainless Steel (specify grade 410/420 or 316)
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End connection type (standard flanged EN 1092-1)
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Medium, operating temperature and pressure
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Any required options (gear operator, bypass, special packing, etc.)
This data sheet describes a typical industrial metal seated gate valve with ductile iron body and bronze trim. Final design may vary to comply with specific project standards; contact the manufacturer for detailed engineering documentation.
