DE10113351A1 - Drainage pipe backwash valve seal involves float valve and counterweight on common shaft so seal closes automatically by counterweight without external force. - Google Patents

Abstract

In a backwash situation the rising float (7) and counterweight (9) automatically close the open seal (5) without external force, using the weight for sufficient closing power. The float, counterweight and seal combinations lie on a common shaft (3) clear of the valve housing (1). Additional components include the sealing sleeve (6) and runoff pipe (8).

Description

Sewage pipes containing faeces can be equipped with 2 butterfly valves according to DIN 19578 secured against backflow.

The operating lock of the backflow flaps should be in the open position in normal operation stand and must close automatically when there is a backflow.

A flap (emergency lock) is closed by hand if necessary.

State of the art

When the valve is closed, a probe is placed in the valve body Back pressure reported to a control unit and the sealing flap with the help of an electric motor closed.

The required closing pressure is achieved by large radial motor forces. Without backflow, the sealing flaps are held mechanically (spring) in the open position.

The invention specified in claim 1 addresses the problem without Measuring probes and without external motor forces, an automatic closing of the sealing flap to achieve with sufficient closing pressure in the case of backflow.

This problem is solved by the measures listed in claim 1 thereby enables that by rising a float - with rising Water in the valve body - a counterweight is lifted above its center of gravity and with a weight the sealing flap rigidly connected to a common shaft brings in the closed position.

Due to the axial force of the counterweight, the required closing pressure is included low force achieved.

The advantages achieved with this invention are in particular that no sensitive measuring probes and no external energy is required (e.g. electric current). Additional advantages are increased environmental protection, low operating costs as well to see low manufacturing costs.

An additional advantageous embodiment of this invention is in claim 2 specified:

Installation of the backflow flap without a counterweight, but with a 90 degree position between float lever and sealing flap lever; enables z. B. that after DIN 19578 required second flap as a manual emergency lock and as a signaling device is used for the start and end of backflow.

The signaling contact is made here at the shaft end by rotating the shaft with increasing (sinking) float enabled.  

An embodiment of the invention is shown in the drawing.

In section AA, the spatial arrangement of the sealing flap ( 5 ) of the float ( 7 ) and the counterweight ( 9 ) is shown in the flap housing ( 1 ). These 3 parts are rigidly connected to the shaft ( 3 ) in this example.

In the functional sectional view BB it can be seen that a water backflow at the drain pipe ( 8 ) causes an increase in the waste water in the valve housing ( 1 ).

The float ( 7 ) rises with the water, the rigidly connected shaft ( 3 ) is turned clockwise and the counterweight ( 9 ) is raised above the dead center in the direction of the arrow. The falling weight ( 9 ) presses the sealing flap ( 5 ) against a sealing sleeve ( 6 ) and the opening of the inlet pipe ( 4 ) is closed.

The sealing sleeve ( 6 ) consists of corrosion-free metal, the sealing flap ( 5 ) is coated with a highly elastic soft seal.

All other materials comply with the DIN regulations.

At the shaft end outside the housing, an additional emergency lock can be opened with a lever done by hand.

Here, too, the sealing flap ( 5 ) is brought into the open position by hand.

Claims (2)

1. According to DIN 19578, backflow valves for sewage containing faeces must automatically close the pipeline in the event of backflow. If there is no back pressure, the operating lock must be open.
In the case of backflow flaps, a backflow is indicated by a measuring probe in the flap housing and the open flap is closed with motor power. The required closing pressure is achieved through high radial forces.
The backflow flap with float and counterweight is characterized by the fact that if the rising float with the associated counterweight accumulates, the open sealing flap automatically moves into the closed position without external forces and the weight generates a sufficient closing force (operating lock). 2. Further assembly combinations of float, counterweight, sealing flap with a common shaft inside and outside a flap housing are part of this invention.
The backflow flap with float - without counterweight - can be used as a signaling unit and as an emergency lock by opening and closing the sealing flap.