Anti-overflow valve: automatic switch for underground oil tanks

1. Introduction to A708 anti-overflow valve:

The AILE Model A708 anti-overflow valve is designed to be installed on a 4” standpipe of an underground storage tank to reduce flow by 90% (at 92% of the appropriate tank capacity) and to shut off flow when 95% of the tank capacity is reached. The valve Once activated, the unloader pipe can also be drained.

AILE Model A708 anti-overflow valve

Model A 708 should only be installed in overflow manholes. The closing point is affected by the specific gravity of the stored liquid. These operating guidelines are based on average performance across all products. This valve is designed only as an emergency overflow prevention device!

2. Technical description

1) Technical parameters
Index Reference
Flow ≥1300L/min
Ambient temperature -20℃~55℃
Connection size DN100
Weight 2.8kg
2) Usage environment
  • The maximum ambient air temperature does not exceed +55°C.
  • The lowest temperature of ambient air is not lower than -20°C.
  • Can be used in Zone 1, Zone 2, and places with explosive gas or steam mixtures.
3) Working principle

The A708 anti-overflow valve mainly relies on the oil’s impact force and the oil’s buoyancy to open the main valve and the auxiliary valve in sequence to slow down the oil discharge. (See picture for details)

Working principle of anti-overflow valve

When the oil level in the oil tank gradually rises to level 1, float 1 drives hook 1 to move upward, causing hook 1 to separate from the main valve plate. The impact of the oil completely closes the main valve plate, and the oil tank unloading speed slows down. When the oil level in the oil tank gradually rises to liquid level 2, float 2 drives hook 2 to move upward, causing hook 2 to separate from the auxiliary valve. The impact of the oil completely closes the auxiliary valve, further easing the speed of unloading oil from the oil tank. After the A708 anti-overflow valve main valve and auxiliary valve are completely closed, it can slow down the oil unloading speed, facilitate the operator to close the oil unloading facility and prevent the oil from overflowing the oil tank.

If you want to check whether the main valve and auxiliary valve can be closed safely before assembly, you can perform the following operations:
  •  Use one hand to push float 1 upward, and use the other hand to pull down the main valve. If the main valve can be pulled down, the installation has no quality problem. Release the hand that pulls the main valve, and the main valve should Automatic return.
  •  Keep the hand holding the main valve still, use the other hand to push the float 2 upward, and use your eyes to see whether the auxiliary valve can be closed. If the auxiliary valve can be closed, it means that there is no quality problem in the installation of the auxiliary valve.
Update cookies preferences

Get a Quick Quote!

x

    Get a Quick Quote!

    x