Company Name : Hindustan Water Engineering Company

HWE Flap Gates are made up of cast iron  or ductile iron depending on the type of service. A small differential pressure on the back of the gate causes it to open automatically to allow discharge through  levees, sewer lines or drainage conduits. When water on the face side of the gate rises above water on the back side, the gate closes automatically to prevent backflow.

Flap gates are equipped with flat back seats for attaching to wall thimbles, new concrete headwalls, existing walls or pipe flanges. The seat or frame of the flap gate is attached to a wall or pipe flange and forms the opening through which water passes. Since the gate opens or closes automatically, a mechanical lifting device is not necessary.

These are used for automatic drainage from outfall structure to rivers, estuaries and sea and for preventing reverse flow during flood/tide from river, estuaries and sea to the plant.

 SALIENT FEATURES 

• Opening against nominal differential pressure.

• Sturdy construction to account for pulsating motion.

• Flange back frame designed for mounting on face of wall.

• Metal to metal sealing on the periphery of gate aperture.

• Adjustable hinge bolt of toughened steel to reduce/increase sensitivity of flap operation in installed condition.

• Rigidly designed cast iron hinge bracket.

• Replaceable hinge bushes of Bronze.

• Replaceable hinge pins of Stainless steel.