Fluoropolymer-lined full-bore check valve designed for reliable uni-directional flow control in corrosive and chemical process lines. The valve uses a floating solid PTFE ball that lifts under normal flow to allow full-port passage and returns to its seat under reverse flow to prevent backflow. A three-piece straight-body construction with complete FEP/PFA/PTFE interior lining eliminates metal-to-media contact for maximum corrosion resistance and long service life.
Key benefits
- Fully lined flow path (PTFE, PFA or FEP) for superior chemical resistance and contamination-free service
- Full-bore (full port) design for high flow capacity and low pressure drop
- Floating solid PTFE ball provides positive, noiseless sealing with minimal wear
- Compatible with horizontal or vertical installation
- Flanged connections for secure piping integration
Construction & materials
- Body: three-piece straight/uni-directional design
- Lining: PTFE, PFA or FEP (full internal lining)
- Internal ball: solid PTFE (rolling ball)
- Body materials available: WCB (carbon steel), CF8 (stainless steel 304), CF8M (stainless steel 316)
- Connection: flange
Operation
Under forward flow the PTFE ball is displaced from the seat allowing unobstructed flow through the full-bore passage. On flow reversal the ball is forced back into its seat, creating a tight shutoff to prevent backflow. The fully lined design prevents wetted metal surfaces, eliminating corrosion and product contamination.
Technical specifications
- Size range: DN15 to DN200
- Applicable temperature: 0 to 200 °C (dependent on lining selection and service conditions)
- Connection type: Flanged
- Lining options: PTFE, PFA, FEP
- Body materials: WCB, CF8, CF8M
- Pressure / leak testing: GB/T 13927, API 598
- Face-to-face dimensions: GB/T 12221, ASME
Applications
Recommended for chemical processing, cold water systems and other piping networks where backflow prevention is required and corrosion-resistant wetted surfaces are essential. Typical uses include corrosive liquid lines, solvent delivery, and general process piping in chemical and industrial plants.
Ordering notes
Specify size (DN), lining material (PTFE/PFA/FEP), body material (WCB/CF8/CF8M), flange standard, and the model reference (FRQ40PFA) to ensure correct configuration for your service conditions. For temperature/pressure deratings consult the vendor data sheets for the selected lining and body material.
Product Details
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