Pfa Teflon Lined Globe Control Valve
- Place of Origin:
- Wenzhou,China
- Packing:
- Suitable Packing for Sea/Air Transport
- Connection:
- Flange
- Pressure:
- PN10,PN16,150LBS
- Temperature:
- -29℃ ~180℃
A lined control valve regulates aggressive corrosive fluid streams by isolating metallic pressure boundaries behind an unyielding fluoropolymer barrier. In single-seat configurations, direct throttling occurs across an anchored fluoropolymer plug and orifice, eliminating galvanic attack and stress corrosion cracking across concentrated sulfuric acid, wet chlorine gas, and spent pickling baths. The single-orifice design ensures shutoff integrity while stabilizing fluid metering across continuous chemical processing.
Cast Rigidity And Full Vacuum Mechanical Integrity
Ductile iron outer castings supply pressure containment capable of absorbing intense piping stresses and pipeline vibration. Precision dovetail machining locks the internal polymer liner against cast surfaces, ensuring lined control valves resist liner detachment or deformation under severe suction drops and full vacuum conditions.
Thermal Cycling Stability And Permeation Limits
Elevated process temperatures often drive aggressive acid vapors through standard elastomeric compounds. Specifying a pfa lined control valve stops micro-porosity formation, blistering, and delamination across severe thermal loops reaching two hundred degrees Celsius, ensuring chemical purity in high-grade solvent processes.
Fluoropolymer Chemical Resistance And Operating Limits
| Fluoropolymer Resin | Thermal Range | Mechanical Yield | Resisted Reagents |
|---|---|---|---|
| Virgin PTFE | -20°C to 180°C | 14 to 28 MPa | Nitric, hydrofluoric, aggressive acids |
| Melt PFA | -30°C to 200°C | 15 to 30 MPa | Chlor-alkali, boiling aqua regia |
| Fluorinated Ethylene Propylene | -40°C to 150°C | 12 to 22 MPa | Caustic wash, wet halogens |
Zero Fugitive Leakage With Bellows Containment
Dynamic stem packing experiences abrasive friction during continuous modulation. Integrating a multi-ply virgin PTFE bellows creates a hermetic seal against fugitive emissions, maintaining ANSI FCI 70-2 Class VI shutoff compliance. Selecting a teflon lined globe control valve delivers smooth internal passages that limit slurry crystallization and reduce operating torque under erratic pressure drops.
Pneumatic Diaphragm Actuation And Linear Control Profiles
Coupling multi-spring pneumatic diaphragm actuators with digital positioners establishes equal-percentage or linear flow profiles with minimal hysteresis. Direct throttle modulation stabilizes the flow coefficient across fluctuating pressure drops, suppressing cavitation damage and extending service intervals across automated distributed control circuits.
Product Parameter
Materials of Main Parts
| No. | Part Name | Material List | ||||
| 1 | Body/Bonnet | WCB | CF8 | CF8M | CF3 | CF3M |
| 2 | Disc/Stem | 1Cr13 | 1Cr18Ni9 | 00Cr17Ni4Mo2 | 1Cr18Ni9 | 00Cr17Ni4Mo2 |
| 3 | Lining/Seat | FEP PTFE PFA PO | ||||
| 4 | Packing | PTFE | ||||
| 5 | Packing Gland | WCB | CF8 | CF8M | CF3 | CF3M |
Technical Specification
| Seat diameter (mm) | 20 | 25 | 25 | 32 | 32 | 40 | 40 | 50 | 50 | 65 | 65 | 80 | 80 | 100 | 100 | 110 | 125 | 150 | 175 |
| Rated Cv | 5 | 10 | 10 | 16 | 16 | 24 | 24 | 44 | 44 | 68 | 68 | 125 | 125 | 165 | 165 | 195 | 330 | 360 | 460 |
| Rated travel | 16mm | 25mm | 38mm | 50mm | 60mm | ||||||||||||||
| Actual pressure | Maxmum 1.0 MPa (1.6 MPa customised) | ||||||||||||||||||
| Nominal pressure | I.0MPa, 1.6MPa | ||||||||||||||||||
| Working temperature | -29°C-180°C | ||||||||||||||||||
| Trim | Single seat plunger valve core | ||||||||||||||||||
| Flow characteristic | Linear, equal percentage | ||||||||||||||||||
| Adjustable range | 50:1 | ||||||||||||||||||
| Equipped with ZJHA/B Multi-springs Diaphragm Pneumatic Actuators | |||||||||||||||||||
| Model | ZJHA/B-22 | ZJHA/B-23 | ZJHA/B-34 | ZJHA/B-45 | |||||||||||||||
| Action mode | ZJHA type actuator refer to "air-to-close" action： ZJHB actuator refer to "air-to-open" action | ||||||||||||||||||
| Pressure supply | According to the scope of spring: 0.02-0.10, 0.04-0.20, 0.08-0.24 Mpa. Respectly are 0.14, 0.25, 0.35 MPa | ||||||||||||||||||
| Air supply connection | Rc1/4 | ||||||||||||||||||
| Basic error | Without positioner:±5%; With posilioner:±1%; | ||||||||||||||||||
| Backlash | Without positioner: 3%; With positioner: 1%; | ||||||||||||||||||
| Dead zone | Without positioner: 3%; With positioner: 0.4%; | ||||||||||||||||||
| End point deviation | Without positioner: opening point±2.5%, terminal point±5%;closing point±5%, terminal point±2.5%. With positioner error from beginning to end is ±1%; | ||||||||||||||||||
| Travel deviation | ±2.5% | ||||||||||||||||||
| Leakage rate | No more than 10 of rated CV | ||||||||||||||||||
| Optional accessories | positioner, air set, solenoid valve, limit switch etc. (according to the order) | ||||||||||||||||||
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