China Top Check Valve Manufacturers How to Choose?

Check Valve Type	Typical Size Range	Typical Pressure Range	Typical Temperature Range	Common Materials	Flow and Installation Characteristics	Key Selection Checks
Swing Check Valve	DN50–DN1200 2–48 in	PN10–PN100 Class 150–600	Approximately −29°C to 400°C −20°F to 752°F	Body: carbon steel, ductile iron, stainless steel Disc: carbon steel or stainless steel Seat: metal, resilient elastomer, or PTFE-based material	Suitable for relatively steady, horizontal flow. Usually offers low pressure loss at design flow, but may be sensitive to reverse-flow slam.	Check closure speed, installation orientation, minimum flow velocity, and the possibility of water hammer.
Wafer Dual-Plate Check Valve	DN50–DN600 2–24 in	PN10–PN420 Class 150–2500	Approximately −196°C to 500°C −321°F to 932°F	Body: carbon steel, alloy steel, stainless steel Plates: stainless steel or alloy steel Seat: metal or engineered elastomer	Compact and lightweight design with short face-to-face length. Suitable for many horizontal or vertical upward-flow applications.	Confirm flange compatibility, flow direction, spring material, cracking pressure, and resistance to pulsating flow.
Lift Check Valve	DN15–DN300 ½–12 in	PN16–PN420 Class 150–2500	Approximately −29°C to 450°C −20°F to 842°F	Body: forged or cast carbon steel, stainless steel, alloy steel Trim: stainless steel or hard-faced alloy Seat: metal or soft seat	Provides positive guided closure and is often used where high pressure and relatively clean fluids are present. Requires adequate flow direction and velocity.	Verify installation position, pressure drop, minimum operating flow, and compatibility with steam, gas, or liquid service.
Tilting-Disc Check Valve	DN150–DN1800 6–72 in	PN10–PN100 Class 150–600	Approximately −29°C to 400°C −20°F to 752°F	Body: carbon steel, ductile iron, stainless steel Disc and shaft: stainless steel or alloy steel Seat: metal or resilient material	Designed for large pipelines and high flow capacity. The disc geometry can reduce closing travel and help limit pressure surges.	Evaluate flow velocity, transient pressure, disc stability, pipeline support, and maintenance access.
Ball Check Valve	DN15–DN300 ½–12 in	PN10–PN100 Class 150–600	Approximately −46°C to 200°C −51°F to 392°F	Body: cast iron, ductile iron, carbon steel, stainless steel Ball: coated steel, stainless steel, or elastomer Seat: NBR, EPDM, FKM, PTFE, or metal	Commonly used in liquid, wastewater, and slurry services. The full-bore ball path can help reduce clogging in suitable applications.	Match the ball and seat material to the fluid, solids content, viscosity, temperature, and required backpressure.
Diaphragm Check Valve	DN15–DN150 ½–6 in	PN6–PN40 Class 150–300	Approximately −20°C to 150°C −4°F to 302°F	Body: PVC, PP, PVDF, lined steel, or stainless steel Diaphragm: EPDM, PTFE, FKM, or other chemically resistant elastomer	Useful for corrosive, sanitary, or low-contamination services. The flexible diaphragm separates the moving mechanism from the fluid in selected designs.	Confirm chemical compatibility, vacuum capability, sterilization requirements, diaphragm fatigue life, and allowable pressure drop.
Size Selection	Select by nominal pipe size only after hydraulic verification	Use the valve’s certified pressure rating at the actual temperature, not only the pipe rating.	Consider thermal expansion, start-up temperature, shutdown temperature, and abnormal operating conditions.	Material selection must cover the body, closure member, shaft, spring, seat, gaskets, and bolting.	Avoid oversizing. An oversized check valve may operate near its cracking pressure, causing chatter, unstable closure, and accelerated wear.	Review line size, required flow, connection standard, face-to-face dimension, maintenance clearance, and installation orientation.
Pressure and Flow-Rate Check	Use actual inside diameter, flow velocity, and expected operating range.	Confirm maximum working pressure, pressure rating class, hydrostatic test pressure, and reverse-pressure capability.	Use the lowest and highest temperatures expected during operation, testing, cleaning, and upset conditions.	Select materials according to corrosion rate, erosion risk, solids content, fluid toxicity, and applicable service requirements.	Estimate pressure loss using the valve flow coefficient or manufacturer’s loss curve. For liquids, a common relationship is: Q = Cv × √(ΔP / SG), where Q is in US gal/min, ΔP is in psi, and SG is specific gravity.	Check minimum flow, maximum velocity, cavitation risk, flashing, water hammer, pulsation, and required non-slam performance.