Overview
The Spears 3639-005 is a 1/2″ socket-and-threaded standard ball valve engineered for reliable fluid shutoff in industrial, commercial, and residential plumbing systems. Built with a PVC body and FKM (Viton) elastomer seals, this True Union 2000 design delivers durable performance across a wide temperature and pressure envelope. The three-piece construction allows for easy cartridge replacement and field maintenance without disturbing piping connections.
Key Features
- True Union 2000 design with integrated O-ring body seals for leak-free operation
- Nominal 1/2″ size with socket and female NPT (FNPT) end connections
- FKM (Viton) seal material compatible with chlorinated water, corrosive chemicals, and high-temperature media
- Manual tee-handle operation with built-in lockout provision
- Standard port design for optimal flow control and minimal pressure drop
- Fully domestically manufactured under Spears Manufacturing quality standards
Technical Specifications
- Nominal Size: 1/2 inch
- Body Material: PVC (Schedule 80)
- Connection Ends: Socket x Female NPT (FNPT)
- Valve Type: Two-way, three-piece true union ball valve
- Port Style: Standard port
- Pressure Rating @ 73°F (23°C): 235 PSI
- Maximum Service Temperature: 140°F (60°C) for PVC; higher temperatures require de-rating
- Seal Material: FKM (Viton O-rings)
- Ball & Stem Material: PVC
- Handle Type: Tee handle with lockout slots
- Weight: Approximately 0.55 lbs
- Dimensions: Length 5.7″, Width 4.0″, Height 2.7″
- Certifications: Meets Spears manufacturing standards
- Comparable Models: Replaces 3629-005 (EPDM version)
Typical Applications
- Municipal and commercial water distribution systems
- Chemical processing and transfer lines (compatible with chlorine, bleach, acids, and bases)
- Plumbing rough-in and potable water isolation
- Cooling tower and HVAC circulation circuits
- Irrigation and agricultural water systems
- Industrial process control requiring reliable two-way shutoff
Compatibility & Replacements
Compatible With
- Standard PVC Schedule 80 socket (spigot) and NPT threaded pipe connections
- Industrial plumbing systems rated for 235 PSI at 73°F
- Media including potable water, non-corrosive liquids, and chemicals (chlorine, bleach, weak acids/bases)
- Temperature ranges up to 140°F for PVC body materials
Replaces / Drop-In Replacement For
- Spears 3629-005 (1/2″ PVC True Union 2000 Standard Ball Valve with EPDM seals) — direct size and pressure equivalent with upgraded seal material
- Generic 1/2″ socket ball valves in equivalent pressure class
Works With
- All standard PVC Schedule 80 fittings and piping systems
- Solvent-weld or socket fusion compatible pipe materials (PVC, CPVC)
- Industry-standard ball valve actuators and automation controls (solenoid, pneumatic, electric) via stem design
- Water treatment, chemical metering, and industrial automation ecosystems
