Womic Stainless Steel Co., Ltd
High Strength: Tensile strength 485-655 MPa, yield strength ≥250 MPa, providing structural integrity for high-pressure drop throttling applications.
Cost-Effective Solution: Most economical control valve material for general process service where stainless steel body is not required.
316L Stainless Steel Trim: Standard trim (plug and seat) provides excellent wear resistance and corrosion resistance for the wetted control surfaces.
Precise Flow Control: Cage-guided design provides stable, high-gain control for fast loop response.
Multiple Trim Characteristics: Quick opening, linear, and equal percentage flow characteristics for different process requirements.
Soft Seat Option: PTFE or PEEK soft seat for bubble-tight shut-off (Class VI).
Metal Seat Option: Metal-to-metal seating for high temperature and erosive service.
Multiple End Connections: Flanged (ASME B16.5), threaded (NPT), and butt weld (BW).
Full Range of Types: Globe control, cage-guided, angle, 3-way mixing/diverting, butterfly.
Pressure Ratings: Available in Class 150, 300, 600, 900, and 1500 (PN16 to PN250).
Temperature Range: Suitable for -29°C to 425°C (-20°F to 800°F) depending on trim and packing materials.
Actuation Options: Pneumatic diaphragm actuator, piston actuator, electric actuator, hydraulic actuator.
Positioner Compatibility: All common positioners (Fisher, Siemens, ABB, Masoneilan, Yokogawa, Rotork) field mountable.
International Certifications: Valves can be certified by ABS, BV, DNV, LR, and comply with ASME B16.34, ISA 75.01.01, IEC 60534, and NACE MR0175 (hardness controlled WCC for sour service).
|
Standard |
Description |
Compliance |
|
ASME B16.34 |
Valve dimensions and pressure-temperature ratings |
WCC |
|
ISA 75.01.01 |
Control valve sizing equations |
Compliant |
|
IEC 60534 |
Industrial-process control valves (international) |
Compliant |
|
ISA 75.08.01 |
Face-to-face dimensions |
Compliant |
|
ASME B16.10 |
Face-to-face dimensions |
Compliant |
|
MSS SP-67 |
Butterfly valves |
Compliant |
|
API 598 |
Valve inspection and testing |
Compliant |
|
NACE MR0175 / ISO 15156 |
Sour service compliance (hardness controlled) |
WCC (upon request) |
|
Component |
Standard Material |
Optional Material |
|
Valve Body |
WCC Carbon Steel |
WCB, LCC, WC6, WC9 |
|
Bonnet |
WCC Carbon Steel |
WCB, LCC |
|
Trim (Plug & Seat) |
316L Stainless Steel |
17-4PH, Stellite Hardfaced, Monel, Hastelloy C276 |
|
Cage |
316L Stainless Steel |
17-4PH, Hastelloy C276 |
|
Stem |
316L Stainless Steel / 17-4PH |
Inconel 718, Monel K-500 |
|
Packing |
PTFE V-Ring / Graphite |
PTFE, Grafoil, Live-Loaded |
|
Gasket |
Spiral Wound (316/Graphite) |
PTFE, Grafoil |
|
Bolting |
A193 B7 (Carbon Steel) |
A193 B7M, A320 L7, A193 B8M |
|
Actuator Mounting Bracket |
Carbon Steel |
316 Stainless Steel |
|
Positioner |
Fisher DVC, Siemens, ABB, etc. |
Customer specified |
|
Characteristic |
Cage Type |
Plug Type |
Applications |
|
Quick Opening |
Fixed, large ports |
Contoured |
On-off, pressure relief, high Cv |
|
Linear |
Equal ports |
Linear contoured |
Level control, liquid service |
|
Equal Percentage |
Increasing port area |
Parabolic contoured |
Pressure control, temperature control, gas service |
|
Modified Linear |
Modified port |
Modified contour |
Compromise, general service |
|
Micro-Flute (Whisper) |
Slotted cage |
Standard |
Noise reduction, cavitation control |
|
Multi-Stage (Tortuous Path) |
Multiple stacked cages |
Standard |
Severe pressure drop, cavitation |
|
Trim Level |
Seat |
Plug |
Cage |
Applications |
|
Standard (316L/316L) |
316L |
316L |
316L |
General process, water, steam, oil |
|
Stellite Hardfaced |
Stellite #6 |
Stellite #6 |
316L |
High temperature, erosive, severe service |
|
Soft Seat (PTFE) |
PTFE inserted |
316L with PTFE |
316L |
Bubble-tight shut-off (Class VI) |
|
Soft Seat (PEEK) |
PEEK inserted |
316L with PEEK |
316L |
High temperature, high cycle |
|
17-4PH |
17-4PH |
17-4PH |
17-4PH |
Higher strength, abrasion resistance |
|
Hastelloy C276 |
C276 |
C276 |
C276 |
Extreme corrosion |
|
Technology |
Trim Type |
Noise Reduction |
Applications |
|
Micro-Flute (Whisper Trim) |
Slotted cage |
10-20 dBA |
Gas service, high pressure drop |
|
Multi-Stage Pressure Drop |
Stacked cages |
20-30 dBA |
Severe pressure drop, cavitation |
|
Anti-Cavitation Trim |
Anti-cavitation cage |
N/A |
Liquid service with cavitation |
|
Expanded Outlet |
Expanded outlet diffuser |
5-10 dBA |
High velocity gas |
|
Valve Type |
Size Range |
Connection |
Pressure |
Flow Characteristics |
Typical Applications |
|
Globe Control |
1″ – 12″ (DN25 – DN300) |
Flanged |
Class 150-600 |
Linear, EQ% |
General process, flow control |
|
Cage-Guided |
1″ – 12″ (DN25 – DN300) |
Flanged |
Class 150-600 |
Linear, EQ% |
High pressure drop, stable control |
|
Angle Control |
1″ – 8″ (DN25 – DN200) |
Flanged |
Class 150-600 |
Linear, EQ% |
Slurry, erosive, high pressure drop |
|
3-Way Mixing |
1″ – 8″ (DN25 – DN200) |
Flanged |
Class 150-300 |
Linear |
Temperature control, blending |
|
3-Way Diverting |
1″ – 8″ (DN25 – DN200) |
Flanged |
Class 150-300 |
Linear |
Flow diverting, bypass |
|
Butterfly Control |
3″ – 24″ (DN80 – DN600) |
Wafer, Lug |
Class 150-300 |
Modified EQ% |
Large flow, low pressure drop |
|
Low Flow (Needle) |
1/2″ – 1″ (DN15 – DN25) |
Threaded |
Class 150-600 |
Linear, EQ% |
Chemical injection, low Cv |
|
Parameter |
Globe Control |
Cage-Guided |
Angle Control |
3-Way |
|
Size Range (NPS) |
1″ – 12″ |
1″ – 12″ |
1″ – 8″ |
1″ – 8″ |
|
Pressure Class |
150 – 600 |
150 – 600 |
150 – 600 |
150 – 300 |
|
End Connections |
Flanged |
Flanged |
Flanged |
Flanged |
|
Face-to-Face |
ISA 75.08.01 |
ISA 75.08.01 |
ISA 75.08.01 |
ISA 75.08.01 |
|
Cv Range |
1 to 1200 |
1 to 1200 |
1 to 600 |
1 to 400 |
|
Actuator Type |
Thrust |
Stroke |
Air Supply |
Applications |
|
Pneumatic Diaphragm (Spring Return) |
100-5000 lbs |
1/2″ – 4″ |
20-50 psig |
Standard, fail-safe (FO/FC) |
|
Pneumatic Piston (Double Acting) |
500-20000 lbs |
1″ – 6″ |
40-120 psig |
High thrust, high pressure |
|
Pneumatic Piston (Spring Return) |
500-10000 lbs |
1″ – 6″ |
40-120 psig |
Fail-safe, high thrust |
|
Electric (Linear) |
500-10000 lbs |
1″ – 6″ |
N/A |
No air supply, remote |
|
Electric (Rotary with Linkage) |
500-5000 lbs |
1″ – 4″ |
N/A |
Cost-effective, no air |
|
Hydraulic (Piston) |
1000-50000 lbs |
1″ – 8″ |
500-3000 psi |
High thrust, high speed |
|
Positioner Type |
Brands Supported |
Communication |
Applications |
|
Pneumatic (Analog) |
Fisher 3660, Masoneilan |
3-15 psig signal |
Simple, low cost |
|
Electro-Pneumatic (Analog) |
Siemens SIPART PS2, ABB TZIDC |
4-20 mA, HART |
Standard, most common |
|
Digital (Smart) |
Fisher DVC series, Siemens, Yokogawa |
4-20 mA, HART, Profibus, FF |
Advanced diagnostics, communication |
|
Explosion Proof |
Fisher DVC7K, Siemens SIPART |
4-20 mA, HART |
Hazardous area (Class I, Div 1) |
|
Intrinsically Safe |
Fisher DVC6K, ABB |
4-20 mA, HART |
Hazardous area (Class I, Div 2) |
|
Feature |
Benefit |
|
Auto-Calibration |
One-touch setup for zero and span |
|
HART Communication |
Remote configuration and diagnostics |
|
Profibus PA / Foundation Fieldbus |
Digital communication for DCS integration |
|
Partial Stroke Test (PST) |
ESD valve proof testing without process interruption |
|
Valve Diagnostics |
Real-time monitoring of travel, friction, and seat load |
|
Stem Position Feedback |
4-20 mA position transmitter |
|
Limit Switches |
Open/close status for DCS |
|
Solonoid Valves |
ESD / trip functions, quick exhaust |
|
Packing Type |
Temperature Range |
Fugitive Emissions |
Applications |
|
PTFE V-Ring |
-29°C to 232°C |
Standard (100-500 ppm) |
General service, low torque |
|
Live-Loaded PTFE |
-29°C to 232°C |
Improved (50-100 ppm) |
High cycle, better emissions |
|
Graphite (Grafoil) |
-200°C to 650°C |
ISO 15848 certified |
High temperature, steam |
|
Live-Loaded Graphite |
-200°C to 650°C |
ISO 15848 certified |
Excellent emission control |
|
Low Emission (LBE) |
-29°C to 400°C |
<50 ppm |
Environmental compliance |
|
API 622 Certified |
-29°C to 400°C |
<100 ppm |
Refinery, chemical |
Raw Material Selection: High-quality WCC carbon steel from certified mills with certified chemical composition and traceability.
Casting/forging: Valve body cast or forged to shape.
Machining: CNC machining of seat bore, cage cavity, stem bore, flange faces, and actuator mounting.
Trim (Plug & Seat) Machining: Precision machining for flow characterization.
Cage Machining: Flow ports sized for specific Cv and characteristic.
Stem Machining: Stem with threads, keyways, or splines for actuator connection.
Hardfacing (if specified): Stellite overlay on seat and plug.
Lapping: Seat and plug faces lapped for bubble-tight shut-off.
Assembly: Body, seat, cage, plug, stem, bonnet, packing, and actuator mounted.
Bench Set: Actuator spring range calibrated (for spring-return actuators).
Flow Testing (if specified): Cv verification, flow characteristic verification.
Hydrostatic Shell Test: 1.5× maximum pressure rating.
Seat Leakage Test: Per ANSI/FCI 70-2 – Class IV (metal seat) or Class VI (soft seat).
Packing Leak Test: ISO 15848 fugitive emissions test (upon request).
Material Verification: PMI for body, trim, stem.
Hardness Testing: For NACE compliance (≤22 HRC for WCC).
Dimensional Inspection: Face-to-face, flange dimensions, trim fit.
Bench Set Verification: Actuator stroke, spring range.
NACE Compliance: Full documentation for sour service (upon request).
Third-Party Inspection: SGS, BV, DNV, TUV, LR on customer request.
Power Plants: Boiler feedwater control, attemperator spray control, steam pressure reducing/desuperheating, condensate recirculation, cooling water control.
Refineries: Crude oil flow control, product blending, pressure reducing stations (letdown), reactor temperature control, fuel gas pressure control.
Chemical Processing: Reactor feed control, distillation column reflux control, product flow control, pressure control loops, temperature control loops.
Oil & Gas: Pipeline pressure control, compressor recycle, separator level control, wellhead flow control (NACE WCC upon request).
HVAC Systems: Chilled water control, hot water control, steam heating control, cooling tower bypass.
Water Treatment: Filter backwash control, chemical dosing, pump recirculation, tank level control.
Steam Systems: Boiler steam pressure control, steam temperature control, deaerator pressure control, turbine bypass.
Pulp & Paper: Digester temperature control, bleach plant chemical dosing, black liquor control.
Marine: Boiler feedwater control, fuel oil viscosity control, cooling water temperature control (ABS/BV/DNV/LR certified).
Critical Note: Control valves are precision instruments. Proper sizing is critical for stable control. Oversized valves cause poor control at low flow; undersized valves cause pressure drop problems. Cavitation and flashing must be considered in liquid services. For pressure reducing applications, anti-cavitation or multi-stage trim may be required.
|
Mounting Configuration |
Positioner Type |
Applications |
|
Integral (Direct Mount) |
Digital smart positioner |
Standard, compact |
|
Remote (Separate) |
Pneumatic or electro-pneumatic |
High temperature, vibration |
|
Field Reversible |
All types |
Quick action reversal |
|
Field Accessible |
All types |
Easy calibration and maintenance |
|
Explosion Proof Enclosure |
Digital smart positioner |
Hazardous area (Class I, Div 1) |
|
Solenoid Valve Type |
Function |
Shut-Off Type |
Applications |
|
3-Way (Standard) |
Air to open / spring to close |
Single solenoid |
ESD, fail-safe |
|
4-Way (Double Acting) |
Power to open / power to close |
Dual solenoid |
Cylinder actuators |
|
High Flow (3/8″ – 1/2″) |
Large porters |
Single or dual |
Large actuators |
|
NAMUR Mounting |
Direct mount on actuator |
Single |
Compact, easy |
|
Switch Type |
Features |
Communication |
Applications |
|
Mechanical |
2 SPDT (Form C) |
Discrete (dry contact) |
Simple open/close |
|
Proximity (Inductive) |
2 NAMUR sensors |
8V DC (intrinsically safe) |
Hazardous area |
|
Reed |
2 reed switches |
Dry contact |
Low cost, simple |
|
Smart (Valve Top) |
Integrated limit switches + positioner |
HART, Foundation Fieldbus |
Full diagnostics |
1. What is the difference between
WCC and WCB control valves?
WCC has slightly higher carbon content and higher strength than WCB. For most
control valve applications, WCC and WCB are interchangeable. WCC is specified
for higher pressure and temperature service.
2. Why use 316L stainless steel
trim in carbon steel body?
316L trim provides excellent wear resistance, corrosion resistance, and galling
resistance for the plug and seat. The carbon steel body provides structural
strength at lower cost. This combination is standard for the industry.
3. What is the difference between
quick opening, linear, and equal percentage trim?
Quick opening – maximum flow at low stroke (on-off). Linear – flow proportional
to stroke (level control). Equal percentage – flow increases exponentially with
stroke (pressure/temperature control). Most process control applications use
equal percentage.
4. What is cage-guided valve?
Cage-guided valve has a perforated cage around the plug, providing stability,
guiding, and flow characterization. Advantages include: higher pressure drop
capability, lower noise, less vibration, and easier trim replacement.
5. What is the difference between
Class IV and Class VI seat leakage?
Class IV (metal seat): 0.01% of rated Cv – for general service with allowable
leakage. Class VI (soft seat with PTFE/PEEK): bubble-tight, zero detectable
leakage – for tight shut-off applications.
6. What trim is recommended for
high pressure drop gas service?
Micro-flute (whisper) trim or multi-stage (tortuous path) trim is recommended
to reduce noise and prevent vibration shock. Standard cage trim may be damaged
by high velocity gas.
7. What trim is recommended for
liquid service with cavitation?
Anti-cavitation trim (special cage design) is recommended to prevent cavitation
damage. Multi-stage pressure drop trim may be required for severe pressure drop
applications.
8. Can WCC control valves be used
for sour service (H₂S)?
Yes, with hardness control (≤22 HRC). WCC material can be NACE MR0175 compliant
when hardness controlled. Contact Womic Steel for NACE certified WCC control
valves.
9. What is the typical stroke for
control valves?
Standard strokes: 1/2″ (for 1″ valve), 3/4″ (1-1/2″ to 2″), 1-1/2″ (3″ to 4″),
2″ (6″ to 8″)
Complete Valve Sizes: 1/2″ to 24″ – all sizes available.
Multiple Trim Options: 316L, Stellite, 17-4PH, PTFE, PEEK – one valve for every service.
Standard 316L Stainless Steel Trim: Superior wear and corrosion resistance.
Multiple Flow Characteristics: Quick opening, linear, equal percentage – choose the right characteristic.
Noise Reduction & Anti-Cavitation Trims: Whisper trim, multi-stage.
All Actuator Types: Pneumatic diaphragm, piston, electric, hydraulic – choose the right actuator.
Positioner Integration: All major brands (Fisher, Siemens, ABB, Yokogawa, Masoneilan) – factory mounted and calibrated.
Smart Positioners with HART, Profibus, FF: Advanced diagnostics and communication.
ISO 15848 Low Emission Packing: For environmental compliance.
NACE MR0175 Compliant: For sour service (upon request).
100% Seat Tested: Class IV (metal seat) or Class VI (soft seat) – documented.
Full Traceability: Heat number on body – traceable to raw material.
Global Delivery: Exported to major power plants, refineries, and chemical facilities worldwide.
Small control valves (≤2″): Individual carton boxes with foam
inserts, positioner calibration sheet, actuator bench set report, IV/VI leakage
test report.
Medium control valves (3″–6″): Plywood
cases with foam padding, each valve separated with flange protectors,
positioner mounted, complete documentation.
Large control valves (≥8″): Wooden
crates with protective wrapping, flange protectors, lifting lugs, pallets,
valve data sheet included.
All shipments:
Actuator bench set report (spring range, stroke)
Positioner calibration sheet (zero, span, characterization)
Seat leakage test report (Class IV or VI)
Hydrostatic test report
MTR (Material Test Report) for body and trim
PMI reports for body and trim
NACE documentation (if applicable)
Complete as-built drawings (if requested)
Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568
E-mail: info@womicstainless.com
Website: www.womicsteel.com
Contact Womic Steel today for a competitive quote on carbon steel WCC control valves. We offer standard 316L stainless steel trim, all actuator types, smart positioner integration, fast production lead times, and reliable global delivery for your process automation projects.
Stock Examples (Flanged Carbon Steel WCC Globe Control Valves – Class 300 – Linear Trim – Pneumatic Actuator):
|
NPS |
DN |
End |
Class |
Trim |
Cv |
Actuator |
|
1″ |
25 |
Flanged |
300 |
Linear |
5 |
30 sq in |
|
2″ |
50 |
Flanged |
300 |
Linear |
20 |
40 sq in |
|
3″ |
80 |
Flanged |
300 |
Linear |
50 |
50 sq in |
|
4″ |
100 |
Flanged |
300 |
Linear |
100 |
70 sq in |
|
6″ |
150 |
Flanged |
300 |
Linear |
200 |
100 sq in |
|
8″ |
200 |
Flanged |
300 |
Linear |
350 |
100 sq in |
Stock Examples (Flanged Carbon Steel WCC Cage-Guided Control Valves – Class 600 – Equal Percentage Trim – High Pressure Drop):
|
NPS |
DN |
End |
Class |
Trim |
Cv |
Actuator |
|
2″ |
50 |
Flanged |
600 |
EQ% |
15 |
70 sq in |
|
3″ |
80 |
Flanged |
600 |
EQ% |
40 |
100 sq in |
|
4″ |
100 |
Flanged |
600 |
EQ% |
80 |
100 sq in |
|
6″ |
150 |
Flanged |
600 |
EQ% |
160 |
150 sq in |
|
8″ |
200 |
Flanged |
600 |
EQ% |
280 |
150 sq in |
Related Keywords (Carbon Steel Control Valves):
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