Standard Flap Check Valves or Standard Flap Gates
Be Free of Debris!
Flap Check Valves also known as Flap Gates are put on the end of a flanged pipe to allow the flow of water out of the pipe, but prevent anything from flowing back in, such as sticks, leaves or other debris. Under direct pressure the valve will open, and it will close when the pressure from outfall fluid is relieved.
Standard Features
As opposed to fabricated parts, our cast parts have less potential for failure over time.
Our machined seat provides a strong, flat surface for the lid to close against. It can withstand even the harshest conditions. The 30" to 36" flap valves employ resilient to bronze seating.
Our flap valves have a coating that gives lasting protection against corrosion.
Our valve pins are made of stainless steel so they won’t corrode and bind up the valve.
This allows for a softer reseating surface and can offer an improved seal.
Stainless Steel Flap Valves
Penn-Troy offers a 4” flap valve in 304 and 316 stainless steel and a 6” valve in 316 stainless steel. Each disc is supplied with a buna-n seal.
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Stainless Steel 3" - 6"
Operation
When properly installed, the flap valve will swing open under direct pressure to release the outfall fluid and close when the direct pressure is relieved. The Troy Valve A2540 Flap Valve has a 10-degree inclined seating plane to ensure positive seating.
Maintenance
Periodic inspection is recommended to determine that the flap disc remains free to swing open and that the bronze seats have not been damaged.
Installation
Valve must be installed so that the bolt holes in the flange (125-lb. template) straddle the vertical center line. See drawing for diameter and quantity required.
Parts
Parts are available by request. Please contact us for more information.
Application Notes
Head Loss Through a Flap Valve
Tests have been performed by Rodney Hunt Company in Massachusetts and other companies to determine the head loss through a flap valve. The tests showed that the head loss is small in comparison with other losses in the system. Tests were run with the flap disc removed from the valve and then with the flap disc in place. The difference in the head loss was therefore the result of the disc. The approximate maximum head loss obtained for the various sizes of flap valves is as shown in the following table:
| SIZE OF FLAP (inches) | MAXIMUM HEAD LOSS (feet) |
| 6 | .031 |
| 10 | .04 |
| 12 | .05 |
| 18 | .076 |
| 24 | .11 |
Flap Valve Sensitivity
Flap valves are normally very sensitive and open with a differential head of less than .2 ft.
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