8″-300LB-RF Diaphragm Pneumatic Actuated Control Valve C/W E/P Positioner

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 (Raised Face)
Applicable Flange Standard ASME B16.5 Class 300
Lining Material FEP / PFA / PTFE (fluoroplastic lining) – selected based on media & temperature

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8″-300LB-RF Diaphragm Pneumatic Actuated Control Valve C/W E/P Positioner

Technical Data Sheet – Diaphragm Pneumatic Actuated Control Valve

(8 Inch, Class 300, WCB Body with Fluoroplastic Lining, with E/P Positioner)

매개변수	사양
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(얼굴 들림)
Applicable Flange Standard	ASME B16.5 Class 300
Lining Material	FEP / PFA / PTFE (fluoroplastic lining) – selected based on media & temperature

Body & Diaphragm Materials

요소	Material Configuration
본체 재질	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)
줄기	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)

매개변수	Value
기준	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

매개변수	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)

매개변수	사양
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)
특징	Auto/manual selector, built‑in pressure gauge, optional feedback module

Performance Data

매개변수	Value
Flow Characteristic	With positioner – Linear or Equal percentage selectable (default: linear)
Rangeability	50 : 1 (with positioner)
누설 등급	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)
압력 등급	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)

매개변수	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

기준	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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