3″-300LB-RF Piston Type Pneumatic Actuated Control Valve c/w E/P Positioner
Description
3″ – 300LB – RF Piston Type Pneumatic Actuated Control Valve with E/P Positioner
Technical Data Sheet
1. General Information
| Item | Description |
|---|---|
| Valve Type | Pneumatic Actuated Control Valve / Globe Control Valve |
| Nominal Size | 3 Inch (DN80) |
| Pressure Rating | Class 300 LB (PN50) |
| Body Material | Carbon Steel WCB / Stainless Steel CF8M (as required) |
| Flange Connection | RF (Raised Face) to ASME B16.5 Class 300 |
| Actuator Type | Piston Type Pneumatic Actuator (single-acting or double-acting) |
| Accessories | Electro-Pneumatic (E/P) Positioner, 4-20mA input signal |
| Application | Precise flow, pressure, or temperature control in oil, gas, chemical, power, and metallurgical industries |
2. Design & Manufacturing Standards
| Standard | Description |
|---|---|
| Valve Design Code | ANSI/ISA-75.08.01 / ASME B16.34 / IEC 60534 series |
| Face-to-Face Dimension | ANSI/ISA-75.08.01 / ASME B16.10 |
| Flange Dimensions | ASME B16.5 Class 300 RF |
| Pressure-Temperature Rating | ASME B16.34 |
| Leakage Class | FCI 70-2 / IEC 60534-4 (Class IV standard; Class V/VI optional) |
| Inspection & Testing | IEC 60534-4 / ANSI/ISA-75.08.01 |
| Actuator Standard | IEC 60534-6 / ISO 5210 (mounting interface) |
| Positioner Standard | IEC 60534-6-1 (mounting and signal interface) |
| Fire Safe Design | API 607 / ISO 10497 (optional) |
3. Main Materials (Typical – can be customized)
3.1 Valve Body Assembly
| Component | Standard Material (Carbon Steel) | Optional Material (SS / Alloy) |
|---|---|---|
| Body | ASTM A216 WCB Cast Steel | ASTM A351 CF8M (316 SS), Alloy Steel |
| Bonnet | ASTM A216 WCB (matching body) | ASTM A351 CF8M |
| Valve Plug (Trim) | ASTM A479 304/316 SS + Stellite hardfacing | 316L, Hastelloy, Monel |
| Seat | ASTM A479 304/316 SS + Stellite hardfacing | 316L, Hastelloy, PEEK |
| Stem | ASTM A276 304/316 SS | 17-4PH, Inconel |
| Stem Packing | Flexible graphite + SS spacer rings | PTFE, low emission packing (ISO 15848) |
| Gaskets | Flexible graphite + SS spiral wound | Metal ring gasket, PTFE |
| Fasteners | ASTM A193 B7 Alloy Steel (zinc plated) | ASTM A193 B8 Stainless Steel |
3.2 Actuator Assembly
| Component | Standard Material | Optional Materials |
|---|---|---|
| Cylinder Body | Cast aluminum / Carbon steel | Stainless steel |
| Piston | Carbon steel + chrome plating / Stainless steel | Bronze |
| Piston Seal | NBR / PTFE + carbon graphite | FKM, Silicone |
| Cylinder End Cap | Cast aluminum / Carbon steel | Stainless steel |
| Spring (single-acting) | Alloy spring steel | Stainless steel |
| Air Supply Port | G 1/4″ / NPT 1/4″ | Custom |
3.3 Positioner Assembly
| Component | Standard Material / Specification | Optional Specifications |
|---|---|---|
| Positioner Housing | Cast aluminum / Engineering plastic | Stainless steel (corrosion resistant) |
| Input Signal | 4-20 mA DC (two-wire) | 0-10V, HART, Profibus PA |
| Air Supply Port | G 1/4″ / NPT 1/4″ | — |
| Enclosure Protection | IP66 (standard) | IP67, Explosion-proof Ex d / Ex ia |
4. Outline Dimensions & Weight (Typical values – may vary by manufacturer)
| Dimension Parameter | Value (Typical) |
|---|---|
| Face-to-Face Length L | Approx. 295 mm (per ANSI/ISA-75.08.01) |
| Flange Outer Diameter D | Approx. 210 mm (ASME B16.5 Class 300) |
| Bolt Circle Diameter K | Approx. 168 mm |
| Flange Thickness C | Approx. 28 mm |
| Number / Diameter of Bolt Holes | 8 × 22 mm |
| Center Height (flange face to center) | Approx. 150 mm |
| Overall Height (incl. actuator & positioner) H | Approx. 800 – 1,100 mm (depending on actuator size and stroke) |
| Valve Body Weight (excl. actuator) | Approx. 55 – 70 kg (depending on material) |
| Actuator Weight (reference) | Approx. 40 – 100 kg (depending on bore and stroke) |
⚠ Dimensions and weights above are typical references. Final dimensions to be confirmed with manufacturer’s drawing.
5. Pressure-Temperature Rating (ASME B16.34 – WCB body, Material Group 1.1)
| Temperature (°C) | Max. Working Pressure (bar) | Max. Working Pressure (psig) |
|---|---|---|
| -29 ~ 38 | 51.1 | 740 |
| 100 | 46.6 | 675 |
| 150 | 44.8 | 650 |
| 200 | 41.9 | 610 |
| 250 | 39.5 | 575 |
| 300 | 37.1 | 540 |
| 350 | 34.1 | 495 |
| 400 | 30.2 | 440 |
| 425 | 26.8 | 390 |
Data based on ASME B16.34 Material Group 1.1. For stainless steel bodies (Group 2.1), pressure-temperature ratings differ. Maximum allowable working pressure decreases with increasing temperature.
6. Performance Data
6.1 Valve Body
| Parameter | Value |
|---|---|
| Pressure Rating | Class 300 (51.1 bar @ 38°C) |
| Shell Test Pressure | 1.5 × rated pressure (approx. 77 bar) |
| Seat Test Pressure | 1.1 × rated pressure (approx. 56 bar) |
| Low-Pressure Air Seat Test | 6 bar |
| Leakage Class (standard) | Class IV (FCI 70-2 / IEC 60534-4) |
| Leakage Class (optional) | Class V / Class VI (soft seat) |
| Flow Characteristic | Equal Percentage (EQ%) / Linear (LIN) |
| Flow Coefficient Cv (typical) | Approx. 100 – 150 (depending on trim and stroke) |
| Rangeability | 50:1 (standard) |
| Temperature Range (standard graphite packing) | -29°C ~ +425°C |
| Temperature Range (low temp service) | -196°C ~ +260°C (with low temp materials) |
| Suitable Media | Water, steam, oil, gas, chemical media, etc. |
6.2 Piston Actuator
| Parameter | Value |
|---|---|
| Action Type | Single-acting (spring return) / Double-acting (no spring) |
| Air Supply Pressure | 4 – 8 bar (6 bar recommended) |
| Stroke | 25 mm, 38 mm, 50 mm, etc. (sized based on valve size and differential pressure) |
| Output Thrust (single-acting) | Depends on cylinder area and supply pressure; up to 5,000 – 50,000 N |
| Output Thrust (double-acting) | Depends on cylinder area and supply pressure; up to 10,000 – 100,000 N |
| Travel Speed | ≤ 1.5 sec / full stroke (adjustable) |
| Explosion Proof | No electrical parts; not intrinsically explosion-proof; can be fitted with Ex accessories |
| Enclosure Protection | IP65 / IP67 |
| Ambient Temperature Range | -20°C ~ +80°C (standard seals) |
6.3 E/P Positioner
| Parameter | Value |
|---|---|
| Input Signal | 4-20 mA DC (two-wire, loop powered) |
| Input Impedance | Approx. 250 Ω (4-20mA) |
| Output Pneumatic Signal | 0.2 – 1.0 bar (standard) / 0 – 10 bar (optional) |
| Supply Pressure | 1.4 – 7 bar (depending on actuator requirement) |
| Air Consumption | Single-acting: approx. 5 L/min (at 0.14 MPa supply) Double-acting: approx. 15 L/min (at 0.4 MPa supply) |
| Linearity | ≤ ±1.0% F.S. |
| Repeatability | ≤ ±0.5% F.S. |
| Sensitivity | ≤ 0.2% F.S. |
| Stroke Range | 10 – 100 mm (linear valve) |
| Ambient Temperature Range | -20°C ~ +70°C |
| Enclosure Protection | IP66 (standard) |
| Explosion Proof (optional) | Ex d IIC T4 / Ex ia IIC T4 |
| Communication Protocol (optional) | HART, Profibus PA, Foundation Fieldbus |
| Valve Position Feedback (optional) | 4-20 mA position feedback signal |
7. Key Features
-
Piston actuator – High output thrust, fast response; suitable for high differential pressure applications. Single-acting version with spring return provides fail-safe action (valve moves to preset safe position upon air supply loss).
-
High accuracy E/P positioner – Converts 4-20mA signal to pneumatic output for precise valve positioning; excellent linearity and repeatability.
-
Globe valve trim design – Equal percentage or linear flow characteristics available to meet various control requirements.
-
Hard-faced metal seat – Standard Class IV leakage; optional Class V/VI for tighter shut-off.
-
Blow-out proof stem – Ensures safety under high pressure.
-
Low emission packing (optional) – Meets ISO 15848 fugitive emission standards for environmentally sensitive applications.
-
High temperature and corrosion resistance – Suitable materials and packing extend service to high temperature, cryogenic, and corrosive media.
-
Modular accessories – Can be equipped with position feedback, limit switches, solenoid valves, filter regulators, etc., for full automation.
8. Fail-Safe Configuration (Single-Acting Actuator)
| Action Type | Valve Position on Air Supply Loss | Valve Position on Signal Loss |
|---|---|---|
| Air-to-Open (ATO / FC) | Spring return → Fail Closed | Positioner output goes to zero → Valve closes |
| Air-to-Close (ATC / FO) | Spring return → Fail Open | Positioner output goes to zero → Valve opens |
| Double-acting | No spring → Fail Lock (holds last position) | Depends on positioner configuration |
Note: Valve position on signal loss depends on the positioner configuration (single-acting positioners typically output zero signal, causing the valve to return to the spring-set position).
9. Optional Accessories
| Accessory | Description |
|---|---|
| Air Filter Regulator | Cleans and stabilizes air supply pressure |
| Solenoid Valve | Provides emergency shut-off or remote on-off control |
| Position Transmitter / Limit Switches | Provides 4-20mA position feedback or dry contact signals |
| Lock-up Valve | Maintains valve position upon air supply failure |
| Pneumatic Booster | Increases response speed for high flow applications |
| Manual Override (Handwheel) | Allows manual operation when power/air is lost |
10. Ordering Information
Please provide the following when ordering:
-
Valve specifications – Size (3″), pressure rating (Class 300), connection (RF)
-
Body material – WCB / CF8M / other alloy
-
Trim material & hardness – Plug and seat material (Stellite hardfacing, etc.)
-
Flow characteristic – Equal percentage / Linear
-
Leakage class – Class IV / V / VI
-
Actuator – Single-acting (ATO/ATC) or double-acting; supply air pressure
-
Positioner specifications – Input signal (4-20mA), explosion-proof rating, communication protocol, enclosure protection
-
Accessories required – Filter regulator, solenoid valve, limit switches, handwheel, etc.
-
Process conditions – Media name, temperature, pressure, differential pressure, flow range
-
Special requirements – NACE MR0175 for sour service, low emission packing (ISO 15848), third-party inspection (BV, DNV, TÜV, etc.)
