对夹式止回阀

Product Overview

The High Pressure 对夹式止回阀 is an ultra‑short pattern check valve designed for high‑pressure pipelines. It typically features a dual‑plate (twin disc) or spring‑loaded single‑plate design, where the discs rotate around a central pin shaft to allow unidirectional flow. Compared with traditional flanged swing check valves, the wafer type offers a face‑to‑face length that is only 1/3 to 1/5 that of conventional valves, resulting in lighter weight, smaller installation space, and reduced pipeline loads.

This valve uses spring‑assisted rapid closing for reliable sealing and is widely used in high‑pressure systems such as oil & gas, petrochemical, power generation, and seawater desalination, with pressure ratings up to Class 1500 or even Class 2500. The connection is wafer type, conforming to standards such as ASME B16.34 and API 594.

 Product Structure

The High Pressure 对夹式止回阀 mainly consists of the following parts:

1. Body: Precision cast or forged body in carbon steel (WCB), stainless steel (CF8/CF8M), duplex stainless steel, etc. Face‑to‑face dimensions comply with ASME B16.10 for wafer check valves. The sealing faces may include grooves for gaskets.

2. Disc (Dual‑Plate Type): Two semicircular discs rotating around a common center pin shaft or two separate shafts. Each disc has its own spring. Sealing faces can be hardfaced with Stellite or covered with PTFE/PEEK.

3. Disc (Spring‑Loaded Single‑Plate Type): One‑piece disc rotating around a top or center pin shaft, equipped with a torsion or coil spring.

4. Spring: Stainless steel (304/316/17‑4PH) torsion or coil spring providing rapid closing force, ensuring the disc seats before reverse pressure builds.

5. Pin Shaft: Stainless steel or Inconel alloy, through‑shaft or split design.

6. Seat: Metal seat (hardfaced) machined in the body or inserted soft seat (PTFE/PEEK).

7. Stop Pin: Limits maximum disc opening to prevent over‑travel.

Compact design, wafer connection – the valve is clamped between two pipe flanges without bolts passing through the valve body.

Function

1. Prevents Backflow of High‑Pressure Media: Forward flow opens the discs; reverse flow or flow stoppage makes the discs close rapidly under spring force and backpressure, stopping backflow.

2. Low Pressure Loss: When fully open, the dual discs lie nearly parallel to the flow path, providing a low resistance coefficient and significant energy savings.

3. Rapid Closing: Stainless steel springs provide instantaneous closing force, effectively reducing water hammer and reverse flow time, especially suitable for high‑pressure and frequent start‑stop conditions.

4. High Pressure & High Temperature Capability: Forged or precision cast bodies with hardfaced metal seats allow reliable operation at pressures up to Class 2500 and temperatures up to 550°C.

5. Ultra‑Short Face‑to‑Face Length: Extremely compact (e.g., DN100 length approx. 60mm), saving installation space and reducing pipe support costs.

6. Any‑Angle Installation (Spring‑Loaded Type): Spring assistance allows horizontal, vertical, or inclined installation (dual‑plate type is typically recommended for horizontal or vertical upward flow).

 Working Conditions

1. Applicable Media: High‑pressure water, oil, natural gas, steam, chemical media, synthesis gas, seawater, etc.

2. Temperature Range: –29°C to +550°C (metal seated); –20°C to +150°C (soft seated).

3. Pressure Rating: Class 150, 300, 600, 900, 1500, 2500 (PN16 – PN420).

4. Nominal Diameter: DN50 – DN600 (2″ – 24″); larger sizes available on request.

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

6. Typical Applications:

   1. High‑pressure steam boiler feedwater systems

   2. High‑pressure hydrogenation unit pump discharges

   3. Natural gas transmission line compressor discharges

   4. Oilfield high‑pressure water injection lines

   5. Power plant high‑pressure feed pump discharges

   6. Seawater desalination high‑pressure reverse osmosis inlet

   7. High‑pressure hydraulic systems

 Summary

The High Pressure 对夹式止回阀, with its outstanding advantages of ultra‑short face‑to‑face length, lightweight design, spring‑assisted rapid closing, and high pressure rating, is an ideal alternative to traditional swing check valves in high‑pressure piping systems. Compared with long‑pattern flanged check valves, it greatly reduces installation space and pipeline loads; compared with lift check valves, it offers lower flow resistance. The dual‑plate design suits large‑bore high‑pressure applications, while the spring‑loaded single‑plate version provides even faster response. Whether in Class 1500 high‑pressure steam systems or Class 2500 chemical reactor outlets, the High Pressure Wafer Check Valve delivers safe, reliable, low‑maintenance backflow protection. For pipeline systems that demand compact design, high‑pressure capability, and cost efficiency, the High Pressure Wafer Check Valve is an indispensable core component.