Pfa Fep 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 prevents severe metallic loss in turbulent acid services through non-reactive polymer encapsulation across internal flow channels. Contoured single-port orifices manage abrupt pressure drops below the fluid vapor pressure, suppressing localized cavitation pits and high-velocity impingement. This protective geometry stabilizes variable flow coefficients across continuous chemical metering lines.
Cavitation Suppression And Orifice Velocity Limits
High pressure differentials force acidic media through tight orifice restrictions, accelerating fluid velocities across the vena contracta. When upstream line velocities exceed acceptable thresholds, micro-bubbles collapse against internal walls, causing mechanical pitting.
Installing an fep valve mitigates abrasive scouring from suspended salt crystals, utilizing low surface tension to deter boundary layer drag and particulate adhesion along contoured valve seats.
Hydrodynamic Throttling Parameters In Corrosive Flow Lines
| Process Line Velocity | Differential Pressure Drop | Fluid Phase Regimes | Internal Flow Path Protocol |
|---|---|---|---|
| 1.0 to 2.5 m/s | Under 0.5 MPa | Single phase laminar liquid | Standard parabolic throttling |
| 2.5 to 4.0 m/s | 0.5 to 1.2 MPa | Incipient bubble formation | Expanded seat discharge radius |
| Above 4.0 m/s | Exceeding 1.2 MPa | Choked flow and rapid flashing | Multi-stage velocity mitigation |
Parabolic Plug Geometry And Rangeability Control
Precise chemical dosing requires wide turndown ratios to handle fluctuating reactor feeds without hunting. Selecting a pfa lined control valve secures high contour stability along the plug profile during continuous micro-metering strokes.
Molded fluoropolymer plug heads resist mechanical deformation from intense hydraulic side-loads, sustaining designated equal-percentage flow profiles without seat binding.
Dynamic Stem Sealing And Pneumatic Positioner Tuning
Fluctuating line pressures induce axial stem oscillation during continuous throttling. Double-containment PTFE seals prevent aggressive fugitive vapor escape across repeated actuation cycles.
Employing a teflon lined globe control valve pairs single-seat shutoff with linear pneumatic actuators, eliminating positioning deadbands across automated loops. Positive spring compression counters process backpressures, securing shutoff integrity during supply air failures.
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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