Поворотный обратный клапан, Межфланцевый обратный клапан

Product Overview

The Wafer Поворотный обратный клапан is a non-return valve installed between pipeline flanges that automatically opens and closes with media flow. Its disc rotates around a pin shaft – opened by forward pressure, and closed by gravity and reverse media pressure. Compared with traditional long‑pattern swing check valves, the wafer design significantly reduces the face‑to‑face length, lowers weight, and minimizes installation space. Widely used in clean or low‑impurity media such as water, oil, and gas, this valve offers low flow resistance, mild water hammer, and reliable sealing. It is an economical and compact alternative to flanged swing check valves.

Product Structure

The Wafer Поворотный обратный клапан mainly consists of the following parts:

1. Body: One‑piece wafer body, available in cast iron, ductile iron, carbon steel, stainless steel, etc., with sealing grooves or O‑rings on both faces.

2. Disc: Metal disc (typically circular), rotating around a top or eccentric pin shaft; available in metal‑to‑metal or soft sealing (rubber/PTFE).

3. Pin / Hinge: Stainless steel or corrosion‑resistant alloy pin ensuring smooth disc movement.

4. Spring (optional): Built‑in auxiliary spring for fast closing or vertical installation in some models.

5. Seat: Machined metal seat or inserted soft seal seat in the body.

Compact structure, extremely short length (similar to a gasket thickness), clamped directly between two pipe flanges without separate flange bolts.

Function

1. Prevents Backflow: Forward flow pushes the disc open; reverse flow quickly returns the disc to its seat by gravity and backpressure, stopping backflow.

2. Low Flow Resistance: When fully open, the disc lies nearly flat along the flow path, providing a smooth passage with minimal pressure drop.

3. Fast Closing: Metal disc responds quickly; with an optional spring, it effectively reduces peak water hammer.

4. Multiple Sealing Options: Metal‑to‑metal sealing (high temperature) or soft sealing (zero leakage).

5. Flexible Installation: Can be installed horizontally or vertically (flow upward); wafer design saves space.

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Working Conditions

1. Applicable Media: Clean water, oil, gas, steam, mildly corrosive liquids, chemical media (material selection required).

2. Temperature Range: Metal seated –29°C to +425°C (depending on material); soft seated –20°C to +150°C (e.g., EPDM/PTFE).

3. Installation Position: Horizontal (preferred), vertical with upward flow also acceptable.

4. Typical Applications:

   1. Pump discharge anti‑backflow

   2. HVAC systems

   3. Fire protection lines

   4. Industrial gas pipelines

   5. Petrochemical piping

   6. Food & beverage clean lines (stainless steel body)

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Summary

The Wafer Поворотный обратный клапан, with its ultra‑short structure, lightweight design, low flow resistance, and high sealing reliability, has become the standard compact product for anti‑backflow applications. It suits a wide range of media – from water and steam to air and oil – and can be used from normal temperature low‑pressure to high‑temperature high‑pressure conditions. Compared with traditional flanged swing check valves, the wafer type offers better installation flexibility, lower maintenance, and cost savings. For pipeline systems that demand space saving, low pressure drop, and long‑term stable operation, the Wafer Swing Check Valve is an ideal choice.