2″-1500LB-RTJ Piston Pneumatic Globe Valve
Description
Technical Data Sheet (English Version)
Product: Pneumatic Piston Globe Valve
Size / Rating: 2″ – Class 1500 – RTJ (Ring Type Joint)
Actuator Type: Pneumatic Piston Actuator
1. General Description
This high‑pressure pneumatic globe valve is driven by a piston‑type actuator, designed for Class 1500 service. The RTJ (Ring Type Joint) flanged ends ensure reliable sealing under extreme pressures using metal ring gaskets. The piston actuator delivers high output torque and fast response, making it ideal for remote automatic control or emergency shutdown applications in oil & gas, petrochemical, power generation, and refining industries.
2. Basic Specifications
| Parameter | Specification |
|---|---|
| Size | 2″ (DN50) |
| Pressure Class | Class 1500 (PN250) |
| Design Type | Globe Valve (Bolted Bonnet) |
| End Connections | Flanged RTJ (Ring Type Joint) |
| Flange Standard | ASME B16.5 |
| Sealing Face | RTJ, suitable for R23 / R24 ring gaskets |
| Temperature Range | -29°C ~ +425°C (depending on seating material) |
| Media | High‑pressure steam, high‑pressure gas, oil, water, corrosive fluids |
3. Material Specification
| No. | Part Name | Standard Material | Upgrade Option |
|---|---|---|---|
| 1 | Body | A105 (CS) / F316 (SS) | F22 (Alloy Steel) / F51 (Duplex) |
| 2 | Bonnet | A105 (CS) / F316 (SS) | Same as body |
| 3 | Disc | 2Cr13 / 304 SS + Stellite hardfacing | 316L + Stellite / Monel |
| 4 | Seat | Integral Stellite overlay on body | Replaceable seat + hardfacing |
| 5 | Stem | 17-4PH / 2Cr13 | Inconel 718 / 316L |
| 6 | Packing | Flexible Graphite + anti‑extrusion rings | Low emission packing set |
| 7 | Stem Nut | Aluminum Bronze | Stainless Steel + anti‑galling coating |
| 8 | Body Gasket | Spiral Wound (with inner/outer rings) | Metal Serrated / Lens Ring |
| 9 | Actuator | Pneumatic Piston Actuator | Double Acting / Spring Return (see Section 5) |
4. RTJ Flange Sealing Features
4.1 Preferred Sealing for High Pressure
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RTJ sealing principle – Metal ring gasket is compressed into the flange groove, creating a metal‑to‑metal line contact seal. Ring materials include soft iron, 304/316 SS, or Inconel.
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High‑pressure capability – RTJ joints are specifically designed for Class 600 and above, maintaining reliable sealing under temperature fluctuations and pressure surges.
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Easy maintenance – Ring gaskets can be reused if undamaged and are simple to replace.
4.2 Ring Gasket Specifications
| Flange Size | Ring Number | Ring Material |
|---|---|---|
| 2″ Class 1500 | R23 / R24 | Soft Iron / 304 SS / 316 SS / Inconel |
Ring type and material to be confirmed based on flange standard and service conditions.
5. Pneumatic Piston Actuator Specifications
5.1 Actuator Basic Parameters
| Parameter | Description |
|---|---|
| Type | Pneumatic Piston Actuator |
| Action | Double Acting / Spring Return (optional) |
| Supply Pressure | 4 ~ 8 bar (standard 5.5 bar) |
| Output Torque | Selected based on valve torque requirements, typically ≥ 1.3 safety factor |
| Operating Temperature | -20°C ~ +80°C (standard) / -40°C ~ +120°C (optional) |
| Cylinder Material | Aluminum (anodized) / Carbon Steel / Stainless Steel |
| Seals | NBR / FKM / PTFE (based on temperature & media) |
5.2 Actuator Accessories (Optional)
| Accessory | Function |
|---|---|
| Solenoid Valve | Controls air supply for remote on/off control (single/dual coil, explosion‑proof optional) |
| Limit Switch | Provides open/close position feedback (mechanical / inductive, explosion‑proof optional) |
| Positioner | Enables precise valve positioning with 4-20mA input signal |
| Air Filter Regulator Lubricator | Ensures clean, stable air supply |
| Manual Override | Allows manual operation during air supply failure |
| Quick Exhaust Valve | Increases closing speed for emergency shutdown applications |
| Lock‑up Valve | Holds valve position upon air supply failure |
5.3 Actuator to Valve Connection
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Mounting standard – ISO 5211 top flange (F10 / F12 / F14, etc., based on torque)
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Connection method – Bracket + coupling to ensure concentricity and reliable torque transmission
6. Key Features
6.1 High‑Pressure Globe Valve Characteristics
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Reliable high‑pressure sealing – Disc and seat are hardfaced with Stellite for high hardness, wear resistance, and erosion resistance under high differential pressure.
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Flow under the disc – Media enters below the disc, ensuring tight shut‑off as pressure assists sealing.
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Blowout‑proof stem – Stem design prevents ejection under pressure.
6.2 Pneumatic Actuator Advantages
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High output torque – Piston design provides greater torque than diaphragm actuators, suitable for high‑pressure valve operation.
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Fast response – Pneumatic actuation offers quick opening/closing for emergency shutdown and frequent cycling.
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Fail‑safe capability – Spring return actuators automatically return to a safe position (open or closed) upon air supply failure.
6.3 Overall Reliability
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Low emission – Packing meets ISO 15848 fugitive emission standards.
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Fire safe – Optional API 607 construction for flammable media.
7. Testing & Standards
| Test / Standard | Reference |
|---|---|
| Design & Manufacture | ASME B16.34 / BS 1873 |
| Flange Standard | ASME B16.5 (RTJ) |
| Pressure Testing | API 598 |
| Shell Test | 1.5 × Class 1500 (37.5 MPa) |
| Seat Leakage Test | 1.1 × Class 1500 (27.5 MPa) |
| Fugitive Emission (optional) | ISO 15848‑1 / TA‑Luft |
| Fire Safe (optional) | API 607 / ISO 10497 |
| Actuator Standards | VDI / VDE 3845, NAMUR |
8. Installation & Maintenance Notes
8.1 Installation Precautions
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Flow direction – Install according to the flow arrow on the body (flow under the disc).
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RTJ flange installation:
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Inspect flange grooves and ring gasket surfaces for scratches or debris before installation
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Ensure the ring gasket is properly seated in the groove
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Tighten bolts evenly in a cross pattern to the specified torque
-
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Air supply – Ensure clean, dry air supply; install an air filter regulator lubricator upstream.
8.2 Commissioning & Operation
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Initial status – Verify the valve is in a safe position before applying air pressure.
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Speed control – Adjust opening/closing speed with flow control valves if needed.
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Limit switch adjustment – Ensure position feedback signals correspond to fully open/fully closed positions.
8.3 Maintenance
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Regular inspection – Check air supply pressure, air line sealing, and actuator operation.
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Packing adjustment – If slight leakage occurs at the packing, carefully tighten the packing gland.
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Ring gasket replacement – When disassembling RTJ flanges, inspect the ring gasket for damage and replace if necessary.
9. Approximate Dimensions (for reference)
| Dimension | Value (mm / inch) |
|---|---|
| Face‑to‑Face Length (L) | ~368 mm (14.5″) |
| Flange Outer Diameter | Per ASME B16.5 Class 1500 |
| Flange Bolt Circle | Per ASME B16.5 Class 1500 |
| RTJ Groove Dimensions | Per ASME B16.5 |
| Overall Height (with actuator) | ~800 ~ 1000 mm (depending on actuator model) |
| Actuator Interface | ISO 5211 F10 / F12 / F14 (torque‑dependent) |
Note: Final dimensions are subject to the specific design; certified GA drawings should be referenced for engineering purposes.
Remarks:
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This valve is designed for high‑pressure applications. Installation and commissioning should be performed by qualified personnel.
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Actuator sizing should be based on actual valve torque, supply pressure, and fail‑safe requirements. Consult the engineering department for selection.
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For explosion‑proof solenoid valves, limit switches, or other accessories, please specify the required hazardous area classification.
