NL1006241C1 - Self drilling drain tap - which can be attached without leaking to pipes carrying liquids or gases - Google Patents

Abstract

A small milling head (22) is attached to the screw connection (21) with which the tap is screwed into one half (24) of a set of clamping brackets with which the tap is mounted on the pipe. The tap is screwed into the a tapped hole in the bracket while the milling head mills a hole to which the tap is to be connected A flexible seal (26), which is mountd around the milling head, together with a flexible sealing patch (27), which is bonded to the pipe, ensure that there is no leak when the mill breaks through the wall of the pipe. The pressure inside the pipe ensures that swarf created during milling can be flushed out through the tap.

Description

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Self-drilling drain valve for leak-free installation in operational installations for the transport of liquids or gases.

The invention relates to a drain valve which can be quickly installed without risk of loss of liquid or escape of gas in drop, rising or other continuous thin-walled metal and plastic pipes of operating low and medium pressure installations for transport. of liquids or gases.

10 To prevent loss of liquid or escape of gas when installing existing drain valve types, the installation or the relevant installation segment must be decommissioned beforehand. The most common procedure is then to cut or saw the pipe at the location intended for the drain valve, to slide it slightly or to remove a piece of pipe, and then to install the valve housing in the opening that has been created using the necessary assortment of tools and sealing materials.

The object of the invention is to considerably simplify the work required for mounting a draw-off tap, as well as to considerably limit the time and equipment and materials required, while prior closure of the liquid flow or gas supply is not necessary.

Without going into the normal operation of a drain tap for liquids or gases, the invention will be elucidated on the basis of a drawing in which 20 indicates the 1006241 - 2 - crane body and 21 casts on or fixed to the crane body attached externally threaded hollow metal tube in which the milling element 22 provided with a milling crown is fixedly connected to the tube wall.

Two clamping brackets 23 and 24 matching the pipe diameter are used for fixing the tap housing to the pipe. Bracket 23 is on the side remote from the tap housing and bracket 24 on the tap house-side of the pipe. The brackets are clamped to the pipe by tightening two mutually identical clamping bolts 25 with a screwdriver.

The bracket 24 is provided with internal screw thread according to pitch and diameter corresponding to the external screw thread present on 21, so that the crane body with the milling element integrated therein by rotating the entire crane housing in a continuous movement directed towards the center of the guidance can be brought.

By means of the resilient seal 26 fitting around the hollow milling tube at the pipe diameter of 20 meters, as well as a self-adhesive elastic sealing plate 27 fitted previously on the external pipe wall at the location of the tap, the space between the valve housing is rotated when the tap housing is rotated The milling head and the pipe wall 25 remain sealed continuously so that 100624f - 3 - liquid or gas cannot escape during and after drilling through the self-adhesive seal 27 and the pipe wall.

Due to the pressure of the liquid or gas from the pipe occurring when the pipe wall is broken, the pipe and sealing residues released during milling are pressed into the tap housing and can be removed therefrom by normal opening of the tap .

The shut-off mechanism for liquids or gases of the drain tap used must be dimensioned such that these residues can be removed without blockage when the tap is opened.

On the external screw thread 21 present on the tap housing, a counter nut 28 is present which, after drilling through the pipe wall, can be tightly tightened against the mounting bracket 24 in order to fix the tap house to the pipe in the desired drainage position.

The invention therefore provides a drain valve which can be mounted quickly and easily in pipelines of operational installations for liquid and gas transport without the need for expertise or experience with little tools or additional sealants.

Should the drain tap only have a short-term temporary destination, the line can be closed again by screwing in a short self-tapping screw, which may be provided with a sealing ring.

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Claims (1)

- 4 - CONCLUSION Self-drilling drain valve for leak-free installation in on-site installations for the transport of liquids or gases which entails an important simplification of work and a limitation of materials for the installation of a drain valve in fall, rise or other continuous thin-walled metal and plastic pipes by rotating in a continuous movement of the crane housing, wherein the milling element integrated in the crane body drills its way into the pipe and wherein the self-adhesive elastic sealing previously applied on the pipe wall plate (27) together with the resilient seal (26) matching the pipe diameter around the hollow milling tube ensures that no liquid or gas can escape during and after the pipe wall is pierced. i uu 62 4 1