WAFER CHECK VALVES

EXPERT make single plate, swing type Wafer Check Valves are used in pipelines to prevent back-flow of the fluid. These valves are fast acting in closing, thereby maximizing protection to prevent or minimize the adverse effect to the back-flow. Opening and closing of the valve takes place at an extremely low pressure difference over the valve disc. The eccentric disc shaft connection with the soft seat embedded in the body ensures a positive shut off of the returning medium.

The Wafer Check Valves have extremely short overall lengths in comparison with the standard flanged end Check valves. The size and weight are considerably reduced. This offers great advantage for installation, handling, transportation and storing.

Constructional Details

BODY

The single piece cast body is precision machined and is available in Cast Iron, SG Iron, Cast Steel. Stainless Steel and other alloy to suit the specific requirements. The body of material Cast Iron, SG Iron & Cast Steel will be epoxy coated to give better corrosion resistance. The dovetail groove machined in the body holds the sealing ring.

DISC

The disc is available in Cast Steel. Stainless Steel and other materials based on the specific requirements.

SEAT

The resilient seat is an '0' ring of EPDM I Nitrile I Silicon I Viton or PTFE and is fitted in the body. The soft seated '0' ring ensures tight shut off.

SPRINGS (OPTIONAL)

The specifically designed springs are of Stainless Steel and ensure positive closing even at low back pressure.

Salient Features

• Compact: Requires little space in piping systems due to the short overall length. Light Weight : Wafer Check Valve is much less in weight compared to conventional flanged end Swing Check valves.
• Bubble Tight Shut-off : The replaceable soft seal fitted in the body ensures a tight shut-off to prevent back-flow.
• Long life of Seat Ring : The seat rings are fitted in the body in order to prevent contact with the flow, which result in longer life of the seat rings. This also ensures the retention of the seat rings in its original position. (i.e the seat rings are not lost in pipe due to the flow pressure).
• Easy & space saving installation : The valves are installed between two flanges and centering is achieved by means of body rim (outside diameter).
• Extremely low opening pressures.
• Easy to handle and maintain.
• Higher sizes available with counter balance and hydraulic cushioning on request.
• Available in different materials of construction.
• Available in wide range of sizes.

Typical Applications Are

Water Treatment Plant | Chemical Industry | Paper Industry | Waste Effluent Plant | Sugar Industry | Desalination Plants | Cooling Water Plants

Size Ranges

PN 10 / PN 16 / #150

DN 25 up to DN 1000

Technical Data | Design Features

Design Standard	Manufacturer 's Standard
Testing	API 598
Face to Face Dimensions	API 6D
Material	Cl I WCB I CF8 I CF8M

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