PTFE Valves & Flow Control Solutions
Zero-Leakage Chemical Flow Control
Corrosion-Proof Lined Valves & Internals
Sag Engineers offers high-integrity PTFE and PFA lined valves as well as precision machined replacement seats, liners, and diaphragms. Designed for total resistance against aggressive acids, moist chlorine, solvents, and corrosive chemical slurries.
Valve Portfolio & Features:
- PTFE / PFA Lined Ball Valves: Two-piece and three-piece full bore designs, locking handle, ISO 5211 mounting pad
- PTFE Lined Plug Valves: Bi-directional bubble-tight shutoff with self-cleaning action and low operating torque
- PTFE Butterfly Valve Liners: Replaceable elastomer-backed PTFE seat liners for wafer and lug type valves
- PTFE Non-Return (Check) Valves: Ball check and swing check valves for vertical or horizontal corrosive flow
- Valve Diaphragms: PTFE face laminated to vulcanized EPDM or Viton backing for metering and control valves
- Spark Tested: 100% electro-spark tested up to 20,000 Volts DC to guarantee zero pinholes or micro-porosity
Performance Advantages:
Bubble-tight sealing complying with API 598 / ISO 5208 Rate A zero leakage standards.
Resistant to full vacuum at elevated temperatures without lining collapse or liner detachment.
Manufactured with ductile iron (GGG40.3) or cast steel bodies lined with 3.0mm to 5.0mm thick virgin PTFE/PFA.
Lined Valve Range & Pressure Ratings
| Valve Model | Standard Sizes (NB) | Flange Standards | Working Pressure | Operating Temperature |
|---|---|---|---|---|
| Lined Ball Valve (Full Bore) | 15mm to 150mm (½" to 6") | ANSI 150# / DIN PN10/16 | Up to 16 Bar | -20°C to +200°C |
| Lined Plug Valve | 15mm to 100mm (½" to 4") | ANSI 150# / BS 10 Table E | Up to 16 Bar | -20°C to +180°C |
| PTFE Lined Butterfly Valve | 50mm to 300mm (2" to 12") | Wafer / Lug type ANSI 150# | Up to 10 Bar | -20°C to +180°C |
| Lined Ball Check Valve | 25mm to 100mm (1" to 4") | ANSI 150# Flanged | Up to 10 Bar | -20°C to +160°C |
| PTFE Metering Diaphragm | Custom as per pump design | Bolt hole circles / Threaded stud | Up to 10 Bar | -20°C to +150°C |