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Stopcock

A shut-off valve provides excellent protection against pipe leaks or possible faults in appliances and faucets. It allows to isolate such or such part of an installation, allowing intervention in a given place, without depriving water of the whole house.

Necessary material

  • Stopcock
  • Exit sleeves
  • Lime
  • Abrasive cloth or emery cloth
  • Torch, soldering lamp or special soldering iron
  • Pickling paste
  • Tin wire
  • Square flame arrestor
  • Teflon
  • Wrench or flat wrench

Steps

  1. Cut the copper tube
  2. Connect the tap to the tube

Cut the copper tube

Tap to connect

Tap to connect

1. A tap is usually supplied with two end caps, each with a flanged collar and a nut corresponding to the tap outlet threads. It is possible to connect these tips to the copper pipe by brazing (which is essential if we put a stopcock on an installation already made), or to use only the nuts and beat a collar to the end of the installation tubes, on each side of the faucet. Start by determining the location of the faucet; trace the length of the tube to be removed with chalk on the existing installation.

Cut the tube with a hacksaw

Cut the tube with a hacksaw

2. After turning off the water at the main shut-off valve of the installation, saw the pipe with a hacksaw. There are miniature saws that facilitate this operation by allowing to work in places of difficult access, many in a water installation. It is not possible to use the pipe cutter on an installation already made (since it is necessary to hold the tube in hand to use this tool).

Stain the tube with a piece of abrasive cloth

Stain the tube with a piece of abrasive cloth

3. The hacksaw does not make a cut as sharp as the pipe cutter. Carefully deburr the end of the tubes (if necessary with a file), then grind it with a piece of abrasive cloth or emery cloth. The application of stripping paste degreases the copper tube, thus promoting the solder.

Soldering torch

Soldering torch

4. The outer section of the installation tube must match the inner section of the sleeves supplied with the shut-off valve (eg, 16/18 for installation and 18/20 for faucet sleeves). You have to force a little to fit them, but it's the guarantee of a perfect solder. The torch used here has a spout encircling the tube, concentrating the heat in a specific place. This beak (Cercoflam) allows to get very quickly the desired temperature. The flameproof square made of ceramic fiber and asbestos-free, protects the wall from the heat of the torch.

Connect the tap to the tube

Position the Teflon on the thread of the tap

Position the Teflon on the thread of the tap

1. The Teflon, placed on the thread on both sides of the valve, ensures a perfect seal. It very advantageously replaces the traditional tow.

Screw the connection nuts

Screw the connection nuts

2. As in any flanged collar, a seal (washer) ensures complete sealing. It only remains to screw the connection nuts and block them. Use a wrench or a wrench, always avoiding the pliers that may mark the copper and round the sides of the nuts.

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