Cast iron flap valve, mainly used for pipelines in water supply and drainage project, sewage treatment project. Its purpose is to overflow or non-return medium, also used as well lids for vertical shaft.

Product Features

(1). Forbid manual operation at single water flow pipelines or water outlet, equip with standard flange, it can connect to all kinds of pipelines.

(2). PM model flap valve is rubber soft water-stop, good effect, resistant to shock.

(3). FPM model flap valve’s proportion is larger than water under water, the open water head is really low(after gravity nullifying, about 0.06m water head).

(4). Installation form mostly is flange structure, easy to install.

(5). Flap valve helps to save electric energy, manpower, water treatment charges and so on.

Installation and Usage

(1). Flap valve can connect to flange, or weld to pre-buried board, or twice pouring.

(2). For the usage of buoyancy tank flap valve, you can change the valve door proportion by water injection to annular seal space, in order to reach excellent open effect.

(3). After installation, it belongs to normal phenomenon if there is a 3mm-gap, when valve door bears certain reversed compression, the gap will reduce or disappear.

(4). During the usage of flap valve, please make sure there has no stone, branch and other sundries that may block up the running pass and sealing ring.

(5). Please frequently clean the dirt below the flap valve, and keep a well lubricating and flexible open at branch holes and hinged shaft.

Rust and Corrosion Protection

Flap valve is often seen in gate, it’s the essential fitting for gate. Flap valve is widely used in chemical engineering, petroleum, hydro-junction project, it’s the important part in hydraulic structure. In the production of flap valve, rust protection technology is more important. Strictly check the rust-proof oxidation film coating is meaningful to prevent flap valve corrosion. If not use the flap valve for a long time, please store it in dry place, and clean the dirt at regular period, also avoid affected with damp. For in service flap valve, when stop using, please clean the dirt and add lubricating oil, keep dry before re-use. Please maintain the flexibility between each component.