Low pressure valve and sink faucet

Low pressure valve and sink faucet

Install low-pressure fitting

In the kitchen installation, there is often the question of which hot water supply is attached. Especially in family houses with central hot water supply, the path between heating with hot water and kitchen is too far to use the warm water without big losses. Here, recommended a separate hot water by means of small memory or water heater.

Is due to the appropriate power supply, a water heater in the long run is an economical investment. However, if you shy away from the high initial cost, reach for water heaters. But caution is necessary here. The two systems of compressed and non-compressed storage differ not only in construction, they require different fittings.

Overview: Install the sink faucet and low-pressure valve

  • Function of pressure accumulators and pressure displacement
  • safety instructions
  • Untertischgerät oversink device
  • Connect low-pressure fitting
  • Sink: Everything tight?
  • Cheap fittings - disadvantages to noise management

Function of pressure accumulators and pressure displacement

For producing hot water between the heaters, pressure accumulators and pressure displacement (low pressure) is discriminated. To understand the function of a low-pressure fitting, it is important to know the structure of the various systems.

Heater only heat water when it is needed and runs through the water heater. They form a very energy-saving device since less water is heated as necessary. In order to provide enough hot water available, it must be heated quickly, which requires a brief enormous power. Not every electrical installation is suitable for it. Similarly, water heater, due to the inherent technology, cost-intensive than hot water tank,

accumulator Add the warm water and heat it to if necessary. Although storage always mean loss, but the devices are relatively simple, and therefore cheaper to buy. A major drawback of this hot water storage tank is the resulting pressure. When water is heated, it expands and creates an overpressure. Without special measures the pressure would push the warm water back into the line and there ensure even heating, which increases the risk of legionella.

For small memory of the pressure can be absorbed by the device and a non-return valve prevents the heating of the tap water in the pipe system. Larger stores can no longer absorb this pressure and therefore require a so-called security group. This consists of two parts: the check and the relief valve. The check valve prevents heating the water in the pipeline network and the relief valve allows high pressure in the form of water into the drain. In old installations of the drain hose is often known yet, which led from the hot water tank in the sink, in the shower or bath. Today, security groups are integrated into the pipe system.

Low pressure valve and sink faucetOperation of the low-pressure fitting

Non-pressure accumulator or low pressure accumulator work without pressure and thus avoid the problem of overpressure. Unlike pressure storing the fresh water is not passed through the memory to the valve and there opened and closed. Depressurized store the cold water supply is (pictured light blue) regulated by the low pressure valve before the pressure-free storage. If the hot water open to the valve, (dark blue hose) passes through the cold water valve to the unpressurized storage and pushes the warm water from the memory via the second tube (red) from the fitting.

The function is similar to a watering can. Is left in the watering can with a hose water and has reached its capacity, excess water runs out of the spout. If you connect the water supply, no water running and thus also no water from the watering can. remains the watering itself "open" and thus depressurized.

This functional structure has the advantage that the resulting in heating pressure can escape through the valve. That explains why running at unpressurized systems frequently water from the faucet. At this very moment the water is heated in the memory.

The appropriate low-pressure valve can be seen easily on the three connections (hoses). In addition, the packaging of low-pressure fittings are often marked with a red flash.

safety instructions

Since low-pressure valves shut off the water supply before the memory, it is imperative that open before the connection to the power grid of the hot-water tap and thus the memory is filled with water.

Pressure-free storage must remain pressure! Therefore, the water outlet must never be closed at the faucet or severely throttled. This refers in part to the aerator to be used, which must be suitable for a pressure-free installation, and secondly to hose attachments. These can kink and thus prevent a water spout. The water would accumulate in this case, hot water tank and develop a pressure for a pressure-free storage is not designed.

Untertischgerät oversink device

How over- and under-table unit

Pressure accumulator and pressure-free storage are differentiated according to their positioning to the extraction point. If the hot water storage tank for an assembly adapted below, it is referred to as a sub-table device and when installed above as a tabletop unit. Externally, the different variants can be distinguished rare, as manufacturers like to save money and use the same case for both spoke rates. However, the internal structure is significantly different. Since hot water rises, the water withdrawal must always be above the storage and the cold water inflow underneath. Now, a Untertischgerät simply inverted and positioned above, on the one hand the water would be removed from below and run out on the other an unpressurized storage. Therefore always pay attention to the labeling and to facilitate the installation batch.

Connect low-pressure fitting

As you can see in the picture above, you need to connect three cables for the installation of a low-pressure valve:

  1. The cold water supply line directly to the angle valve
  2. The hot water supply line from the valve to the unpressurized storage
  3. The cold water supply line from the valve to the unpressurized storage

Modern steel braided water supply lines are color-coded in general and their connection described in the instructions. With the red and blue tubes are often referred to hot water tank, which has the same colored ports. The third tube (for direct connection to the water supply) is usually not further characterized, but differs often by a different length.
Turn the screw by hand first on, then, if appropriate, with feeling a quarter turn with the wrench after. More is not necessary as rubber gaskets to seal well without much pressure. If more force is applied, the seal may be damaged and no longer seals off with a lot of effort.

Sink: Everything tight?

Now the function and leak check. Be careful during the whole function test leakages at the fittings, especially on cold water supply to the wall.

  • First, turn the cold water tap on or swivel the mixer tap into the cold water area and pull up.
  • Now turn the hot water on the storage device should be filled with water. Wait until the water flows back through the tap - Before the hot water tank must not be connected to the mains!
  • Now connect the hot water tank to the power supply and check whether the indicator light signals the heating function.
  • Last: Wait a while and check the warmth of the water: If necessary, adjust the heat output of the rotary switch to. 

Everything works, everything tight? Then your hot water tank is ready connected and ready.

Cheap fittings - disadvantages to noise management

Fittings are one of the largest sources of noise in the home: the flowing water causes the pipes to vibrate, which are transmitted throughout the home. Especially in apartment buildings, this represents a problem if you feel disturbed the neighbors.

When designing a particularly favorable construction market faucets usually the noise is neglected on cost grounds. This can significantly disrupt later - for example, if the kitchen is located next to the bedroom.

Therefore, for valves with a low noise level a special seal designed according to DIN 4109th These produce consistently only 20 dB (A) noise level - the loudest fixture in the test 47 dB (A). This is comparable to the difference between a quiet room and normal speaking volume.

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