If your professional activity is to maintain existing or install new engineering networks of gas supply, water supply or heating, you know how steel flanges are needed, the price of which is not comparable to the price of a gate valve, valve, meter, for which they are intended to replace.
On pipes of small diameter, up to 50mm., As a rule, couplings (threaded connections) are used for diameters of 50mm. and above, you cannot do without flanges, which allow you to quickly and easily replace the failed fittings listed above. What are welded steel flanges at an affordable price ? Anyone who bought the above equipment should note that at the inlet and outlet of a gate valve, valve, meter there is a welded flange whose price in this case has already been included in the cost of the fittings. To remove a failed valve or valve, it is enough to unscrew the eight nuts that connect the flange welded to the pipe with the valve or valve flange.
You have a rush on the pipe, but the valve is out of order, and there is no valve needed to replace it. How to fix the accident? A flange connection allows an effective interim solution to an emergency situation. It is enough to remove four bolts from one joint behind the faulty valve and insert a two-layer gasket made of a sheet of roofing sheet and rubber from a tire (plumbers call this connection "pancake"), and the rubber should be located closer to the faulty valve. After that, the bolts must be tightened. The rubber will provide a tight seal, and the sheet metal will withstand the hydraulic pressure of the system. Now you can eliminate the accident, and after purchasing the valve, they replace it, after which the "pancake" is removed
To fully organize the operation of networks, you must have flanges of different sizes in stock, in accordance with the flanges of the equipment you are using. You will not always find the flange you need on sale. Therefore, you often read in the classifieds section: buy flanges, expensive.
