PVC True Union Ball Valve
This double union ball valve allows full inline maintenance without disassembling surrounding pipework. The true union design features dual carrier adjustment points and end connectors that unscrew from the valve body, giving engineering teams direct access to internal seals, O-rings, and ball components.
Description
Product Overview
This double union ball valve allows full inline maintenance without disassembling surrounding pipework. The true union design features dual carrier adjustment points and end connectors that unscrew from the valve body, giving engineering teams direct access to internal seals, O-rings, and ball components.
Engineered for industrial fluid handling, water treatment, and chemical processing, the smooth inner bore minimizes friction head loss and prevents solids buildup during continuous flow service.
Key Product Characteristics
Dual Block / True Union Structure: Both end connections unthread independently, enabling cartridge removal while line pressure remains upstream (when closed).
Adjustable Seal Retainer: Threaded seal carrier allows manual pre-loading adjustment on PTFE seats to correct for wear without removing the body.
Blowout-Proof Stem: Internal stem loading prevents stem ejection under sudden pressure surges or system line spikes.
Full Port Flow Path: Internal ball orifice matches schedule 80 pipe IDs, maintaining full flow rates and reducing pumping head requirements.
Actuator-Ready Top Flange: Molded mounting pad accommodates ISO 5211 direct mounting for pneumatic or electric actuation packages.
Key Specifications
|
Size Range |
1/2" – 4" (DN15 – DN100) |
|
Pressure Rating |
PN16 / 232 PSI @ 73°F (23°C) |
|
Temperature Range |
32°F to 140°F (0°C to 60°C) |
|
Pressure Test Standard |
EN 12266-1 / ISO 5208 (Shell: 1.5x PN, Seat: 1.1x PN) |
|
End Connections |
ANSI Schedule 80 Socket / Threaded (NPT) / DIN Metric / Flanged |
|
Flow Coefficient (Cv) |
1/2": 14 | 1": 55 | 2": 240 | 3": 580 | 4": 1120 |
Materials & Media Compatibility
Body & Ball Material
Cell class 12454 Unplasticized Polyvinyl Chloride (PVC-U). Free of plasticizers to prevent chemical leaching and degradation in ultra-pure water circuits.
Seat Seals
Virgin PTFE (Teflon) with low friction coefficient, providing chemical inertness across the pH 1–14 spectrum.
O-Ring Options
EPDM: Standard choice for municipal water, chilled water loops, dilute acids, and alkaline solutions.
FKM (Viton): Specified for higher concentration acids, petroleum derivatives, oils, and halogenated hydrocarbons.
Connection & Configuration Options
Standard Valve Body Configuration (PN16 PVC-U):
End Connectors
Socket End (ASTM D2467 / DIN 8063)
Threaded End (ANSI B1.20.1 NPT / ISO 7-1 BSPT)
Flanged End (ANSI B16.5 Class 150 / DIN EN 1092-1)
Actuation Options
Ergonomic Manual Handle (with integrated spanner tool)
Pneumatic Actuator (Double Acting / Spring Return)
Electric Actuator (24V DC / 110V AC / 230V AC, On-Off / Modulating)
Application-Specific Design Considerations
Thermal Expansion: PVC linear expansion coefficient is 0.08 mm/m·°C. Pipe runs exceeding 30 meters require expansion loops to avoid side-loading the valve body unions.
Pressure De-rating: Operating pressure decreases as media temperature rises:
- 73°F (23°C): 100% PN16 (232 PSI)
- 110°F (43°C): 60% PN16 (139 PSI)
- 140°F (60°C): 22% PN16 (51 PSI)
Water Hammer Risks: Fast quarter-turn closure can create pressure transients. For high-velocity lines (> 5 ft/s), motorized actuators with adjustable travel speeds (> 10 seconds) prevent hydraulic shock.
Applications
Industrial Water Treatment
RO system skid piping, deionization feed lines, and backwash manifold networks.
Chemical Processing
Dosing systems for sodium hypochlorite, ferric chloride, sulfuric acid (< 70%), and sodium hydroxide.
Aquaculture & Commercial Pools
High-flow recirculation manifolds and salt-water filtration loops.
Surface Finishing & Electroplating
Acid bath transfer lines, rinsing tanks, and wastewater neutralization tanks.
Quality & Inspection
Every production batch undergoes traceable quality control protocol prior to packing:
Dimensional Audit: Digital caliper verification of socket depth, thread pitch tolerances, and wall thickness against ASTM/DIN standards.
100% Hydrostatic Testing: Air-under-water shell testing at 1.5x rated pressure and seat sealing inspection at 1.1x rated pressure for 15 seconds minimum per valve.
Torque Testing: Breakaway and running torque measurement to verify PTFE seat pre-load consistency across batch lots.
Material Certification: Raw resin batch analysis verifying cell classification, tensile strength, and impact resistance.
OEM / ODM & Customization
Private Labeling: Laser-etched or custom molded brand logos on handles, valve bodies, and box packaging.
Custom Color Matching: Custom resin compounding for corporate branding or system line identification (e.g., grey, blue, black body options).
Actuation Assembly: Factory pre-assembly and torque calibration of electric or pneumatic actuators with limit switches and positioners.
Kitting & Packaging: Barcode labeling, custom master carton configurations, and pre-packaged replacement seal kits (PTFE seats + O-rings).
FAQ
Q: Can this valve be serviced under full line pressure?
A: No. You must depressurize the pipeline before loosening the union nuts. Closing the valve blocks upstream pressure, but the downstream fluid within the valve body must be vented safely before servicing.
Q: What is the purpose of the built-in handle tool?
A: The end of the removable handle features two molded lugs that fit into the slots on the internal threaded seal carrier, allowing on-site adjustment or replacement of the ball seats without dedicated tools.
Q: How do I choose between EPDM and FKM O-rings?
A: Select EPDM for general water treatment, municipal supply, and mild acids/alkalis. Choose FKM when handling concentrated acids, oils, solvents, or chlorine gas solutions.
Q: Are socket dimensions compatible with Schedule 80 PVC pipe?
A: Yes. Socket ends meet ASTM D2467 dimensions for schedule 80 PVC pipe fitting. Metric socket ends complying with DIN 8063 are also available upon request.
Q: Can PVC true union ball valves handle slurries or abrasive media?
A: Suspended solids can scratch PTFE seats and score ball surfaces, causing seat bypass over time. Flush lines with clear water after transferring media containing particulates above 50 microns.
Q: What causes union nut backing-off in high-vibration skids?
A: Vibration from nearby pumps can loosen thread engagement. For high-vibration installations, request our locking union nut options or install pipe supports within 5 pipe diameters on both sides of the valve.
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