PVDF True Union Ball Valve
This PVDF True Union Ball Valve isolates and controls aggressive chemicals, high-purity fluids, and high-temperature media. Built with double true union ends, it permits line maintenance and carrier removal without cutting into the piping manifold.
Description
Product Overview
This PVDF True Union Ball Valve isolates and controls aggressive chemicals, high-purity fluids, and high-temperature media. Built with double true union ends, it permits line maintenance and carrier removal without cutting into the piping manifold.
The fully injection-molded PVDF body handles halogenated compounds, concentrated acids, and high-temperature DI water up to 120°C (248°F) under pressure. An ISO 5211 mounting pad is integrated directly into the body for direct-mount pneumatic or electric actuation.
Key Product Characteristics
Double Block & True Union Design: Disconnect the valve body from the pipeline for seat replacement or cleaning while keeping solvent or threaded connections intact.
Pure Virgin PVDF Resins: No pigments, stabilizers, or fillers. Minimizes metal ion leaching and organic carbon contamination in ultra-pure water (UPW) systems.
Stem Shear Protection: Engineered with a dual O-ring stem seal and a sacrificial shear point above the packing to prevent stem blowouts under line surges.
Adjustable Seat Carrier: Threaded seat retainer allows manual pre-loading adjustment on the PTFE seats to compensate for seal wear without disassembling the body.
Key Specifications
|
Parameter |
Value |
|
Size Range |
1/2" - 4" (DN15 - DN100) |
|
Pressure Rating (20°C) |
PN16 / 232 PSI (1/2"-2"), PN10 / 150 PSI (2.5"-4") |
|
Operating Temperature |
-20°C to +120°C (-4°F to +248°F) |
|
End Connections |
Socket (ANSI / DIN / JIS standard), Threaded (NPT / BSPT), Flanged (ANSI 150 lb / DIN PN10) |
|
Actuator Mounting |
ISO 5211 Direct Mounting Pad (F03 / F05 / F07 options) |
|
Leak Rate Class |
ANSI B16.104 Class VI (Bubble Tight) |
Materials & Media Compatibility
Bill of Materials
Body / Ball / Stem / Union Nuts: Pure Polyvinylidene Fluoride (PVDF)
Ball Seats: Virgin PTFE (Teflon) backed by elastomeric cushion rings
Stem & Body O-Rings: FKM (Viton) standard; FFKM (Kalrez equivalent) or EPDM optional
Chemical Resistance Profile
Compatible Media: Wet chlorine gas, nitric acid (<70%), hydrofluoric acid (<50%), sulfuric acid (98%), sodium hypochlorite, ozone, ultrapure DI water.
Incompatible Media: Fuming sulfuric acid (Oleum), strong polar solvents like acetone, ethyl acetate, and liquid potassium or sodium.
Connection & Configuration Options
End Ends: Socket fusion (IR / Butt fusion available upon request), NPT / BSPT threaded female ends.
Actuation Interface: Hand lever with built-in locking plate (standard). Factory-assembled ISO 5211 pneumatic (double acting / spring return) or electric actuators (24VDC, 110VAC, 220VAC with 4-20mA feedback).
Application-Specific Design Considerations
Thermal Expansion: PVDF expands at a higher rate than metallic piping (1.2 x 10^-4 / K). Installations over 60°C require pipe alignment guides and expansion loops near the union nuts.
System Pressure Derating: Maximum operating pressure decreases as media temperature rises:
|
Temperature |
Max Working Pressure (1/2"-2") |
|
20°C (68°F) |
16 bar (232 PSI) |
|
60°C (140°F) |
10 bar (145 PSI) |
|
90°C (194°F) |
6 bar (87 PSI) |
|
120°C (248°F) |
2.5 bar (36 PSI) |
Applications
Semiconductor Fabrication
UPW (Ultrapure Water) distribution lines and chemical mechanical planarization (CMP) slurry dosing.
Chlor-Alkali Plants
Wet chlorine gas transfer and concentrated brine recovery loops.
Industrial Battery Manufacturing
Lithium-ion electrolyte blending and battery-grade acid metering lines.
Chemical Processing
Dosing lines handling hot concentrated nitric and sulfuric acid mixtures.
Quality & Inspection
Hydrostatic Shell Testing: 100% of production units tested at 1.5x cold working pressure (24 bar for PN16) per ISO 5208.
Seat Leakage Test: Pneumatic pressure testing at 6 bar (87 PSI) nitrogen to ensure zero-bubble seal integrity.
Dimensional Verification: Critical stem, socket, and thread dimensions verified via CMM (Coordinate Measuring Machine).
Material Traceability: Raw material batch inspection certificates (EN 10204 Type 3.1) provided with every shipment.
OEM / ODM & Customization
Custom End Dimensions
Custom socket depth and flange bolt-circle drilling per project drawings.
Private Labeling
Laser marking on body/handle for part numbers, brand logos, and flow direction arrows.
Cleanroom Packaging
Double PE bagging flushed with filtered nitrogen for ultra-pure applications.
Custom Seals
Pre-installed FFKM O-rings for specialized aromatic compound lines.
FAQ
Q: What is the difference between PVDF and CPVC ball valves?
A: PVDF operates at higher continuous temperatures (up to 120°C vs. 93°C for CPVC) and offers superior resistance to strong oxidizers like concentrated nitric acid, wet chlorine gas, and organic solvents.
Q: Can the union nuts be tightened while the line is under pressure?
A: No. De-pressurize and drain the piping line before loosening or tightening union nuts. Tightening under pressure damages body threads and distorts internal stem alignment.
Q: Are these valves suitable for vacuum service?
A: Yes. The true union design with dual O-ring stem seals holds vacuum pressure up to 29.9 inHg (760 mmHg) at ambient temperatures.
Q: How does the valve handle thermal cycling?
A: PTFE seat back-up rings absorb thermal expansion of the PVDF ball, preventing stem binding and maintaining consistent operating torque across the rated temperature range.
Q: What ISO 5211 flange sizes are used for actuator selection?
A: 1/2" to 1" sizes use F03/F05 mounting pads; 1-1/4" to 2" use F05/F07; 2-1/2" to 4" use F07/F10 standard patterns.
Q: Does the valve body support IR (Infrared) socket welding?
A: Standard socket ends support standard heat socket fusion. PVDF resin grades optimized for IR butt-fusion end connectors can be supplied upon technical review.
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