轴流式止回阀

Product Overview

The Tilted Disc Axial Flow Check Valve is a spring‑assisted check valve featuring an axial streamline flow path and a disc that opens and closes by tilting around an eccentric pin shaft. Compared with traditional swing check valves, this valve offers extremely low flow resistance, short closing stroke, low water hammer impact, and reliable sealing. Under forward flow pressure, the disc tilts open, creating an almost unobstructed flow path. When reverse flow occurs or flow stops, the disc closes rapidly under the combined action of spring force, gravity, and reverse media pressure, effectively eliminating water hammer.

This valve is widely used in applications with high demands on water hammer protection and energy efficiency, such as high‑pressure pump discharges, long‑distance water transmission lines, petrochemical plants, power stations, water treatment systems, and marine systems. The valve features flanged connections and is available in ductile iron, carbon steel, stainless steel, and other materials, with nominal diameters from DN50 to DN1200 and pressure ratings up to Class 1500.

Product Structure

The Tilted Disc Axial Flow Check Valve mainly consists of the following parts:

1. Body: Axial streamline cast or forged body in ductile iron (QT450‑10), carbon steel (WCB), stainless steel (CF8/CF8M), etc. Flanged ends conforming to GB/T 9113, ANSI B16.5, EN 1092‑1, etc. The internal flow path is straight‑through or Venturi‑type with no sharp turns.

2. Disc: Tilting disc that rotates around an eccentric pin shaft. When open, the disc tilts into a chamber beside the flow path; when fully open, it is nearly parallel to the flow direction, resulting in minimal flow resistance. The sealing face can be hardfaced with Stellite or covered with rubber/PTFE.

3. Pin Shaft: Eccentric pin shaft made of stainless steel or corrosion‑resistant alloy, providing a self‑sealing effect (eccentricity design) when the disc closes.

4. Spring: Stainless steel torsion spring or coil spring providing initial closing force to maintain sealing at zero flow.

5. Seat: Metal seat (Stellite hardfaced) machined in the body or inserted soft seat (PTFE, PEEK, NBR, EPDM).

6. Stop Device: Limits the maximum disc opening angle (typically 70°–80°) to prevent over‑travel.

7. Access Cover: Removable bonnet or side cover for internal part inspection and replacement.

Compact construction with an axial flow path that allows smooth media flow; the tilting disc creates almost no obstruction when open.

Function

1. Prevents Backflow: Forward flow tilts the disc open; reverse flow or flow stoppage makes the disc close rapidly under spring force, eccentric self‑sealing effect, and backpressure, stopping backflow.

2. Extremely Low Flow Resistance: When fully open, the disc is nearly parallel to the flow direction, providing a smooth flow path. Pressure loss is only 30%–50% of that of traditional swing check valves, delivering significant energy savings.

3. Rapid Closing: The eccentric design combined with the spring results in a short closing stroke (the disc rotates only about 70°), providing fast response and effectively reducing water hammer peaks.

4. Non‑Slam Closing: The tilting disc seats smoothly against the sealing surface without the slamming noise typical of conventional swing check valves.

5. High Sealing Performance: The eccentric pin shaft creates a self‑sealing torque when the disc closes – the higher the pressure, the tighter the seal. Soft sealing options provide zero leakage.

6. Low Opening Pressure: Optimized spring stiffness, opening pressure typically 0.005–0.02 MPa.

7. Bidirectional Pressure Capability (some designs): Certain models can withstand reverse pressure, facilitating system maintenance.

Working Conditions

1. Applicable Media: Water, raw water, seawater, sewage, oil, chemical media, gas, steam, etc.

2. Temperature Range: –29°C to +200°C (soft seated); –29°C to +550°C (metal seated, material dependent).

3. Pressure Rating: Class 150, 300, 600, 900, 1500 (PN16 – PN260).

4. Nominal Diameter: DN50 – DN1200 (2″ – 48″); larger sizes available on request.

5. Installation Position: Horizontal pipeline (recommended); vertical (flow upward) also acceptable.

6. Typical Applications:

   1. High‑pressure centrifugal pump discharges (water hammer protection and energy saving)

   2. Long‑distance water transmission lines (reducing pumping energy consumption)

   3. Petrochemical plant pump discharges

   4. Power plant circulating water and boiler feedwater systems

   5. Water hammer‑sensitive systems (e.g., high‑rise building water supply)

   6. Wastewater treatment plant lift pump discharges

   7. Marine ballast water systems

Summary

The Tilted Disc Axial Flow Check Valve, with its advantages of axial streamline low‑resistance flow path, eccentric tilting disc design, spring‑assisted rapid closing, and low water hammer impact, is an ideal anti‑backflow device for high‑pressure, high‑flow, and water hammer‑sensitive piping systems. It combines the low flow resistance of swing check valves with the fast response of axial flow check valves, achieving an excellent balance between energy savings and water hammer protection.

Compared with traditional swing check valves, this valve offers a shorter closing stroke, smoother seating, and more reliable sealing. Compared with axial straight‑stroke check valves, the tilting disc is less sensitive to impurities and easier to maintain. For pipeline systems that demand system safety, smooth operation, and energy efficiency, the Tilted Disc Axial Flow Check Valve is a trustworthy core component.