DN200-PN16-RF Diaphragm Pneumatic Actuated Control Valve

Product Name Diaphragm Pneumatic Actuated Control Valve
Valve Type / Model DN200-PN16-RF (Diaphragm type)
Nominal Diameter (DN) 200 mm
Nominal Pressure (PN) PN16 (1.6 MPa / 232 psi)
Connection Type Flanged
Flange Face Type RF (Raised Face)
Applicable Flange Standard GB/T 9119 / HG/T 20592 / ASME B16.5 (or as specified)

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DN200-PN16-RF Diaphragm Pneumatic Actuated Control Valve

Technical Data Sheet – Diaphragm Pneumatic Actuated Control Valve

(WCB Body + Finned Stem for High Temperature)

Tham số	Đặc điểm kỹ thuật
Product Name	Diaphragm Pneumatic Actuated Control Valve
Valve Type / Model	DN200-PN16-RF (Diaphragm type)
Đường kính danh nghĩa (DN)	200 mm
Nominal Pressure (PN)	PN16 (1.6 MPa / 232 psi)
Connection Type	Flanged
Flange Face Type	RF (Nâng mặt)
Applicable Flange Standard	GB/T 9119 / HG/T 20592 / ASME B16.5 (or as specified)

Body & Diaphragm Materials

Thành phần	Material Configuration
Vật liệu thân máy	WCB (ASTM A216 Grade WCB) Carbon Steel Casting
Body Lining	Unlined / Hard Rubber / FEP / PFA / PP (depending on media corrosivity)
Diaphragm Material	EPDM / EPDM+PTFE laminated / FKM / PTFE (selected based on media temperature & corrosivity)
Bonnet / Yoke	WCB Cast Steel

Stem Configuration: Finned stem (cooling fins) – The bonnet is equipped with annular cooling fins that increase surface area to accelerate heat dissipation from the stem packing area. This effectively reduces the temperature gradient at the packing gland, preventing thermal degradation of sealing components under high‑temperature service. This configuration extends the valve’s applicable temperature range to -29℃ ~ +450℃.

WCB Body Material Data (ASTM A216 Grade WCB)

Tham số	Value
Tiêu chuẩn	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%
Hardness (NACE sour service)	≤ 22 HRC
Xử lý nhiệt	Normalized, normalized & tempered, or quenched & tempered
Weldability	Good (typical CE 0.45 ~ 0.48)

WCB Applicable Temperature Range

Service Condition	Phạm vi nhiệt độ	Nhận xét
Standard operating	-29℃ ~ +425℃	ASTM A216 standard range
With finned stem (extended)	-29℃ ~ +450℃	For high‑temperature applications
Below -29℃	Replace with ASTM A352 LCB/LCC	Low‑temperature carbon steel, impact tested
425℃ ~ 565℃	Replace with ASTM A217 WC6	1.25Cr‑0.5Mo alloy steel
Above 565℃	Replace with ASTM A217 WC9 / C5 / C12	2.25Cr‑1Mo or high‑Cr alloy

Important Note: WCB is subject to graphitization above 425℃. For continuous high‑temperature service (e.g., thermal oil), it is recommended to keep the long‑term operating temperature ≤300℃.

WCB Media Compatibility

Media Type	Suitability
Water, oil, air, steam	Recommended
Steam (saturated, PN16)	Recommended
Petroleum products, natural gas	Recommended
Acetone, alcohol, ammonia, benzene	Suitable
Sour service (H₂S)	Use with caution – consider C5, CF8 or anti‑sour materials
Strong acids / strong bases	Not recommended – use stainless steel (CF8/CF8M) or lined body
Fluoride‑containing media (HF, fluorides)	Strictly prohibited
Phosphoric acid (>30%, >150℃)	Strictly prohibited

Actuator Specifications

Tham số	Value
Actuator Type	Multi‑spring pneumatic diaphragm actuator
Diaphragm Effective Area	Approx. 1200 cm² (depending on stroke and output force)
Air Supply Pressure Range	0.3 ~ 0.7 MPa (recommended 0.4 ~ 0.6 MPa)
Stroke	40 ~ 60 mm
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

Performance Data

Tham số	Value
Flow Characteristic	Quick opening (ON‑OFF); with positioner – approximately linear
Rangeability	30 : 1 (with positioner)
Lớp rò rỉ	Bubble‑tight seal, meets ANSI/FCI 70‑2 Class VI (zero leakage)
Shut‑off Differential Pressure	Max. allowable ≥ 1.0 MPa (depends on air supply & spring range)
Rated Cv Value	Approx. 650 ~ 750 (water, full open, depending on flow path)
Media Temperature Range	-29℃ ~ +450℃ (with finned stem + high‑temperature diaphragm)

Optional Accessories

Accessory	Function
Electro‑pneumatic positioner	4‑20 mA signal control, improves regulation accuracy
Filter regulator	Cleans and stabilizes air supply
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

Dimensions & Weight (reference)

Tham số	Value
Face‑to‑face length (L)	Approx. 495 mm (GB/T 12221 series 1, PN16 DN200)
Overall height (H)	Approx. 850 ~ 1050 mm (depends on actuator & fin height)
Actuator outer diameter	Approx. 380 ~ 450 mm
Reference weight	Body ~120 kg + Actuator ~35 kg

Typical Applications & Media Recommendations

Media Type	Recommended Configuration
Water, oil, air, steam (≤300℃)	WCB + EPDM diaphragm
High‑temperature steam, thermal oil (≤300℃)	WCB + finned stem + EPDM+PTFE laminated diaphragm
Dilute acids / alkalis	WCB with FEP lining + PTFE diaphragm
Strong acids / alkalis, organic solvents	Change to stainless steel body (CF8/CF8M) + PFA lining + PTFE diaphragm
Food, pharmaceutical	Change to stainless steel unlined + silicone diaphragm
Slurries, fibrous media	WCB with wear‑resistant rubber lining + EPDM diaphragm

Applicable Standards

Tiêu chuẩn	Content
Design & manufacture	GB/T 12239 / ISO 16138 (diaphragm valve standard)
Flange dimensions	GB/T 9119 / HG/T 20592 / ASME B16.34
Body material standard	ASTM A216 / ASME SA‑216 Grade WCB
Pressure testing	GB/T 13927 / API 598
Leakage class	ANSI/FCI 70‑2 Class VI
Air connection	ISO 228 / G thread

Critical Notes

WCB body is NOT suitable for strongly corrosive media (strong acids/bases, fluoride‑containing fluids). Use stainless steel or lined bodies for such services.
Finned stem is designed for high‑temperature applications. The annular cooling fins on the bonnet reduce packing area temperature and prevent high‑temperature seal failure.
Continuous high‑temperature operation – Although WCB is rated to 425℃, for continuous high‑temperature service (e.g., thermal oil) it is recommended to limit the long‑term working temperature to ≤300℃ to avoid embrittlement and hardness loss.
Diaphragm material must match service conditions. For high temperatures, use PTFE or EPDM+PTFE laminated diaphragms. For temperatures above 200℃, consult the supplier for diaphragm temperature rating.
Low‑temperature service – When media temperature is below -29℃, WCB is subject to cold embrittlement. Replace with ASTM A352 LCB/LCC low‑temperature carbon steel body.

CAM KẾT:

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