PVC-U Clapper Valve

Clapper check valve 

The clapper valve is a type of non-return valve but it incorporates a flapper that acts, with gravity, as a shutter. What this element does is to prevent the passage when the fluid moves in the undesired direction. They work by gravity so they have to be placed in a certain position. 

It is installed at the base of the suction pipe of a pump, between the pump and the tank, thus allowing the fluid to pass but preventing it from backing up into the tank. 

We have a wide range of dimensions and combinations to adapt the installation to your needs from 63 mm diameter up to 315 mm diameter and in a normal pressure of PN 6. 

Features PVC-U clapper valves

• Small installation space required
• Easy to install: mounted between standard flanges. No need for additional gaskets
• Vertical and horizontal installation
• Excellent flow characteristics

Important: Do not mount the valve at a distance of less than 5 x D from a pump outlet. Install with PN 10 pipe, if PN 16 is used, damage to the valve may occur. 

Specifications clapper valve

• 0.1-3 bar: Minimum downstream pressure to keep the valve closed, depending on installation conditions.
• PVC-U body
• O-rings in EPDM
• Blue marking: EPDM seals, to be chosen according to the fluid.

Note: It is important to choose the type of valve according to the fluid and therefore to choose between EPDM or FPM (Viton) seals.

Dimensions PVC-U clapper valve

The following table shows the outer diameter, the normal pressure, and the references of the flapper valve:

Consult the following table for the dimensions of the clapper valve according to the outside diameter.

Clapper valve components

1. PVC-U body
2. PVC-U clapper
3. PP plug
4. EPDM/FPM body gasket
5. EDPM/FPM clapper gasket

Pressure/temperature diagram