Technical Data Sheet – Diaphragm Pneumatic Actuated Control Valve
(8 Inch, Class 300, WCB Body with Fluoroplastic Lining, with E/P Positioner)
Parameter | Specificatie |
Product Name | Diaphragm Pneumatic Actuated Control Valve |
Valve Type / Model | 8″-300LB-RF (Diaphragm type, lined) |
Nominal Diameter (NPS) | 8 inch (DN200) |
Pressure Class | Class 300 (PN50) per ASME B16.34 |
Connection Type | Flanged |
Flange Face Type | RF (verhoogd gezicht) |
Applicable Flange Standard | ASME B16.5 Class 300 |
Lining Material | FEP / PFA / PTFE (fluoroplastic lining) – selected based on media & temperature |
Body & Diaphragm Materials
Onderdeel | Material Configuration |
Lichaamsmateriaal | WCB (ASTM A216 Grade WCB) Carbon Steel Casting |
Body Lining | FEP, PFA, or PTFE lining (full lining, including all wetted surfaces) |
Diaphragm Material | PTFE or EPDM+PTFE laminated (for corrosion resistance & flexibility) |
Bonnet / Yoke | WCB Cast Steel (with protective coating) |
Stang | Standard stem (no cooling fins) |
Lining Details: The valve body is fully lined with a fluoroplastic material (FEP, PFA, or PTFE) to provide exceptional corrosion resistance against strong acids, alkalis, and aggressive chemicals. The diaphragm is also PTFE or PTFE-faced to match the lining.
Lining Material Data (FEP / PFA / PTFE)
Property | FEP | PFA | PTFE |
Continuous service temperature | -29℃ ~ +150℃ | -29℃ ~ +180℃ | -29℃ ~ +200℃ |
Peak temperature (short term) | +175℃ | +200℃ | +230℃ |
Chemical resistance | Excellent (most acids, alkalis, solvents) | Excellent (similar to PTFE) | Excellent (universal) |
Permeation resistance | Good | Better than PTFE | Moderate |
Wear resistance | Moderate | Good | Moderate |
Typical applications | Strong acids, alkalis, organic solvents | High-purity chemicals, aggressive media | Severe corrosive service |
Important: The overall temperature rating of the lined valve is limited by the lining material. Do not exceed the lining’s continuous service temperature.
WCB Body Material Data (for reference – structural only, wetted parts are lined)
Parameter | Value |
Standaard | ASTM A216 / ASME SA-216 |
Material Type | Carbon steel casting |
Chemical Composition | C ≤ 0.30%, Mn ≤ 1.00%, Si ≤ 0.60%, S ≤ 0.045%, P ≤ 0.04% |
Tensile Strength | 485 ~ 655 MPa (70 ~ 95 ksi) |
Yield Strength | ≥ 250 MPa (36 ksi) |
Elongation | ≥ 22% |
Operating temperature range | -29℃ ~ +425℃ |
Note: The WCB body provides mechanical strength; the fluoroplastic lining provides chemical resistance. The media does not contact the WCB material.
Actuator & Positioner Specifications
Parameter | Value |
Actuator Type | Multi‑spring pneumatic diaphragm actuator |
Actuator Model (Typical) | 5200LA or equivalent |
Diaphragm Effective Area | Approx. 1600 cm² (for 8″ stroke & force requirement) |
Air Supply Pressure Range | 0.14 ~ 0.7 MPa (recommended 0.4 ~ 0.6 MPa) |
Stroke | 40 ~ 80 mm (depending on actuator size) |
Action Mode | Air‑to‑open (FC – fails closed) or Air‑to‑close (FO – fails open) optional |
Spring Range | 0.02 ~ 0.10 MPa (standard); custom 0.04~0.20 MPa available |
Air Connection | G1/4″ or NPT1/4″ |
Actuator Diaphragm Material | NBR + PET reinforced nylon |
Positioner | Included – Electro‑pneumatic (E/P) positioner (4‑20 mA input) |
Positioner Details (Typical)
Parameter | Specificatie |
Type | Electro‑pneumatic positioner (E/P) |
Input Signal | 4 ~ 20 mA DC (standard, adjustable to 1/4 split range) |
Supply Pressure | 0.14 ~ 0.7 MPa |
Air Consumption | ≤ 0.5 Nl/min (steady state) |
Output Pressure Range | 0 ~ 0.7 MPa |
Linearity | ≤ ±1.0% |
Hysteresis | ≤ 0.5% |
Repeatability | ≤ 0.5% |
Enclosure Protection | IP66 (typical) |
Housing Material | Aluminum alloy or stainless steel (optional) |
Functies | Auto/manual selector, built‑in pressure gauge, optional feedback module |
Performance Data
Parameter | Value |
Flow Characteristic | With positioner – Linear or Equal percentage selectable (default: linear) |
Rangeability | 50 : 1 (with positioner) |
Lekkageklasse | Bubble‑tight seal, meets ANSI/FCI 70‑2 Class VI (zero leakage) |
Shut‑off Differential Pressure | Max. allowable ≥ 1.0 MPa (depends on lining & actuator) |
Rated Cv Value | Approx. 650 ~ 750 (water, full open, depending on flow path) |
Media Temperature Range | -29℃ ~ +180℃ (depending on lining material – see lining table) |
Drukclassificatie | Class 300 (PN50) per ASME B16.34 |
Standard Accessories (Included)
Accessory | Function |
Electro‑pneumatic positioner (E/P) | 4‑20 mA signal control, precise proportional regulation |
Filter regulator | Cleans and stabilizes air supply (typically included with positioner package) |
Optional Accessories (Available on Request)
Accessory | Function |
Solenoid valve | Remote on/off control of air circuit |
Limit switch box | Provides open/closed position feedback |
Air lock valve | Maintains last position upon air failure |
Manual handwheel | Local manual operation |
Positioner feedback module | 4‑20 mA position feedback signal |
Dimensions & Weight (reference)
Parameter | Value |
Face‑to‑face length (L) | Approx. 495 mm (19.5 inches) per ISA-75.08.02 for Class 300 |
Flange standard | ASME B16.5 Class 300 RF |
Overall height (H) | Approx. 850 ~ 1050 mm (depends on actuator & positioner) |
Actuator outer diameter | Approx. 380 ~ 450 mm |
Reference weight | Body ~120 kg + Actuator ~35 kg + Positioner ~2 kg |
Typical Applications & Media Recommendations
Media Type | Recommended Configuration |
Strong acids (HCl, H₂SO₄, HNO₃) | WCB + FEP/PTFE lining + PTFE diaphragm + E/P positioner |
Strong bases (NaOH, KOH) | WCB + FEP lining + PTFE diaphragm + E/P positioner |
Organic solvents | WCB + PFA/PTFE lining + PTFE diaphragm |
Oxidizing agents (chlorine, bleach) | WCB + FEP lining + PTFE diaphragm |
High-purity chemicals | WCB + PFA lining (low extractables) |
Hydrofluoric acid (≤50%, ≤150℃) | WCB + special PTFE lining (consult supplier) |
Corrosive slurries | Not recommended – abrasion damages lining |
Water, oil, air (non-corrosive) | Suitable (but lining may be unnecessary) |
Applicable Standards
Standaard | Content |
Design & manufacture | ASME B16.34 / ISA-75.08.02 |
Lining standard | ASTM F1545 (fluoroplastic lining) |
Flange dimensions | ASME B16.5 Class 300 RF |
Body material | ASTM A216 Grade WCB |
Pressure testing | API 598 |
Leakage class | ANSI/FCI 70‑2 Class VI |
Positioner standard | IEC 60534 |
Critical Notes for Lined Valves
- Corrosion resistance – The fluoroplastic lining (FEP/PFA/PTFE) provides excellent resistance to almost all chemicals except molten alkali metals and some fluorine compounds at high temperatures. Always verify compatibility with your specific media.
- Temperature limitation – The valve’s maximum operating temperature is limited by the lining material. Do not exceed +180℃ for FEP, +200℃ for PTFE/PFA. For higher temperatures, a lined valve is not suitable.
- Class 300 pressure rating – The valve is designed for Class 300 service per ASME B16.34, suitable for higher pressure applications up to approximately 5.0 MPa at ambient temperature.
- Avoid vacuum service – Fluoroplastic linings can collapse under vacuum (especially at elevated temperatures). For vacuum applications, a special vacuum-resistant lining design is required. Consult the supplier.
- Abrasive media – Lined valves are not recommended for abrasive slurries (e.g., with sand, crystals) as they can wear through the soft lining.
- Electrostatic discharge – For flammable media, ensure the valve has anti-static design (conductive PTFE lining or grounding device).
- Installation – Use gaskets suitable for lined flanges (full-face gaskets recommended). Do not overtighten bolts to avoid damaging the lining.
- E/P Positioner is included – Enables precise modulating control with 4-20 mA input signal. Default flow characteristic is linear. Equal percentage available upon request.
Final Selection Checklist (8″-300LB-RF, WCB+Lining, Standard Stem, with E/P Positioner)
Item | Confirmation |
Nominal diameter | 8 inch (DN200) |
Pressure class | Class 300 |
Body material | WCB with fluoroplastic lining |
Lining type (to be confirmed) | FEP / PFA / PTFE |
Stem type | Standard (no cooling fins) |
Positioner | E/P Positioner included (4‑20 mA input) |
Media temperature range | -29℃ ~ _____℃ (max. lining limit) |
Service media (to be confirmed) | ___________ |
Diaphragm material | PTFE / EPDM+PTFE laminated |
Action mode (to be confirmed) | Air‑to‑open (FC) / Air‑to‑close (FO) |
Vacuum service? | Yes / No (if yes, special design required) |
Additional accessories | Solenoid valve / Limit switch / Handwheel |
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