Strong, inert, built to last.
Unplasticised polyvinyl chloride (UPVC) pipe systems are widely used in fluid handling thanks to their combination of mechanical strength, chemical resistance and durability.
Unlike traditional metal piping, UPVC does not corrode, scale or rust, which makes it ideal for long-term use in both industrial and domestic installations.
- High chemical resistanceSuitable for acids, alkalis, salts and a wide range of aggressive fluids.
- Smooth inner surfaceMinimises pressure loss and prevents deposits for efficient flow.
- Light and easy to installLower handling costs and quick assembly with solvent cement or mechanical connections.
- Long service lifeResistant to UV radiation, weathering and wear, for reliability in diverse environments.
- Safe and hygienicApproved for potable water supply and ideal for irrigation, industrial processes and water treatment.
- A complete systemWith valves and accessories, UPVC pipe systems are a complete, cost-efficient solution for fluid transport.
Technical characteristics.
- Material
- Rigid, unplasticised PVC compound with high tensile and impact strength, excellent dimensional stability and resistance to most inorganic chemicals.
- Working temperature
- 0 °C to +60 °C, with intermittent peaks up to 65 °C depending on pressure and application.
- Pressure classes
- PN 6, PN 10 and PN 16, according to ISO 1452 and DIN 8061/8062.
- Standards
- ISO 1452 (water supply and pressure piping) · DIN 8061/8062 (UPVC pipes and fittings) · EN ISO 15493 (industrial thermoplastic piping) · ASTM D1785/D2467 (PVC pipes and fittings)
- Joining methods
- Mainly solvent cement welding and mechanical unions, for leak-proof connections that are easy to install.
- Hydraulic performance
- The smooth bore keeps friction losses low over time and prevents scaling and biological growth.
- Service life
- Over 50 years under normal operating conditions.
Source: Fitvalf catalogue 2026–2027.
High-pressure UPVC fittings.
Fittings take the highest hydraulic turbulence, dynamic stress and changes of direction in a pressurised system.
While pipes provide the continuous conduit, tees, elbows, reducers, adaptors and flanges carry the load where the flow changes. FITVALF pressure fittings are precision injection-moulded from high-density virgin UPVC compounds for structural uniformity, precise tolerances and pressure ratings typically up to PN 16.
Optimised hydraulic flow
Interior radii and transitions are smoothly swept to limit flow separation, vortices and friction losses, reducing the load on circulation and booster pumps.
Reinforced stress zones
Elbows and tee branches see continuous dynamic loads and water hammer. Wall thickness is increased at these critical points, beyond nominal safety factors at full working pressure.
Socket geometry
Sockets have a precise taper to ISO 727 and EN ISO 1452. The interference fit at the socket base gives maximum fusion and an even spread of cement, without voids, run-off or dry spots.
Threaded and hybrid connections
BSP/NPT threaded adaptors and transition fittings are reinforced against tightening torque and temperature changes where they meet metal valves, pumps or instruments.