HDPE flap valve

HDPE Flap Valve Material: Composite Material Size: DN50-3000 Less weight Long service life

HDPE Flap Valve 

Structure and operating principle of flap valve:

It’s composed of valve seat, valve plate, consolidated soil seal ring, hinge four parts.

Only be used to single-track water of round or square water outlet, it has advantage of strict structure, good reliability and operate need not the force of people. Motive power of start and stop come from the pressure of water. When the inside pressure greater than outside, the flap valve will open, conversely, it will close.

The nature of flap valve:

Nominal pressure: 0.1MPa-1.0MPa

Applicable media: water, river water, seawater, living water, industrial sewage.

Applicable temperature: <50°C

Applicable scope:

water conservancy system, municipal wastewater, flood control works, sewage treatment plant, waterworks and so on.

The specification and category:

The specification of flap valve is divided into round and square two kinds, it can be designed and produced depend on the form of the water outlet.

The flap valve has two categories: hollow floating plate shape and flat plate shap.

FRP flap valve mechanical property reference table

1.direction elastic modulus	2.direction elastic modulus	shear elastic modulus	Poisson's ratio	tensile strength of 1,2 direction 1,2
10GPa	10GPa	4GPa	0.25	120MPa

The performance of flap valve

Item/material	FRP flap valve	Steel flap valve	Cast iron flap valve	HDPE flap valve
tensile strength (MPa)	160-320	380	187	21
Specific strength	100-168	48.5	25.5	22
specific gravity	1.8-2.1	7.84	7.34	0.954
Opening water level (mm)	>20-50	>150	>150	>50
Opening angle	>60°	<50°	<50°	>60°
corrosion resistance	Resist	no resistant	no resistant	Resist
ageing resistance	Resist	Resist	Resist	Resist
Seal condition	Well	Well	Bad	Well
Maintain and replace	General maintenance-free	make once corrosion prevention every year	make once corrosion prevention every year	General maintenance-free
Theftproof condition	Without recycling value	easy be stolen	easy be stolen	easy be stolen

Install of flap valve:

1. Flap valve can be installed in the following ways: flange connection and concreting.

2. The distance of the centre of flap valve and flow centre allowable deviation is not greater than 3.0mm.

3. Flap valve all around should be left 400 mm installation space, below the export of flap valve, there is made a slop of 1:5.

4. Install fitting: bolt or expand silk use stainless steel or carbon steel through antiseptic treatment; seal fitting use rubber or rubber gasket.

FRP flap valve installation requirements:

Flange connection type flap valve divide into wing ring tube flange connection type, embedded bolt flange connection type and expand screw flange connection type three kinds.

 Wing ring tube flange connection type:

When make flap valve, put the wing ring tube with flange pouring on the water outlet place. Flange and basic face should be parallel, fix the flap valve after solidify of concrete. (Applicable to below DN1000)

HDPE flap valve