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
