Pressure switch

As you know, the main prerequisite for doing any work is to have proper information about that subject.  In order to choose, review the prices, buy and know more about temperature transmitters, the following contents are included so that you, dear visitors of the specialized website of DamaTajhiz, can use these information to choose and wholesale buy all types of water, air and gas pressure switches from Honeywell, Dongz, Danfoss, ABB, Saginumia, Fantini, etc. brands in bulk.

A brief introduction and buying guide for pressure switches

Pressure switches are a type of pressure control switch. When the input pressure reaches the specified level, they activate the electrical contact and cut off the switch by sending an electrical signal. The pressure switches may be designed to cut or connect the current when the pressure increases or decreases. Pressure switches are usually used in industries requiring automatic pressurized fluids' automatic adjustment or control. Another type of pressure switch or pusher switch detects mechanical force. For example, similar to a pressure-sensitive screen, the doors of industrial buildings are opened automatically or used in alarm security programs, such as pressure-sensitive floor coverings. Pressure switches have different types in terms of fluid and working pressure. Join us in introducing and checking the performance of pressure switches in the rest of this article (for wholesale purchase).

Types of pressure switches in terms of working fluid

Pneumatic switch pressure - Air pressure switch

1. This model of pressure switches is of simple types and is mainly used in pneumatic systems or air compressors. Other applications of pneumatic pressure switches include the following:
2. In domestic use, turn on the water pump automatically when water is drawn from the tanker.
3. Gas compressor electric cutoff: When the pressure in the gas tanks reaches the set pressure level, the gas compressor is cut off.
4. Gas compressor shutdown: when there is no feed at the suction level.
5. in Batteries
6. They turn the alarm in the aircraft's cockpit on and off if the cabin pressure (based on altitude) is too low.
7. Tubes are filled with air in counting traffic and gas stations, and switches are activated when vehicles enter them.

Hydraulic pressure switch - Water pressure switch

The primary use of these pressure switches is water pumps. Also, hydraulic pressure switches have many uses in cars, such as warning when the engine oil pressure falls below the safe level or controlling the automatic locking of the automatic transmission torque.
Before the 1960s, pressure switches were used in hydraulic brake circuits to control power to the brake lights, but newer cars use a switch directly activated by the brake pedal.

Gas pressure switch

These switches are used for flammable gases and note that sparking should be avoided as much as possible. Because any spark in this environment, due to the presence of gas, causes the gas to ignite and fire.

Steam pressure switch

These switches work with steam, so one of the essential features of this switch is high temperature and humidity tolerance. These cool switches are air, water, oil, or hydrogen fluoride. Activating the electrical switch (SPDT) at the set pressure value is one of the main functions of these pressure switches.

Types of pressure switches in terms of working mechanism

• electromechanical
• solid state

Electromechanical pressure switches use several types of sensors and determine the relative accuracy of the sensor and the lifespan of the switch and include the following types:

• Differential pressure switch
• Diaphragm switch pressure
• Capsule pressure switch
• Bellows pressure switch
• Bardoni pressure switch
• Piston pressure switch

differential pressure switch

These pressure switches have a diaphragm, metal or elastomeric sensor, and two inputs (one for high pressure and the other for pressure). The function of the sensor is to detect the pressure difference between the two inputs and activate the on/off switch. Nothing happens as long as the pressure in the two inlets is equal. As the pressure in the high-pressure inlet increases, the diaphragm moves to the low-pressure part and moves the shaft or piston towards the switch. After that switch, the electrical signal issues the necessary to the desired place.

Diaphragm switch pressure

These types of switches are plastic or metal. In the diaphragm pressure switch, the diaphragm is connected to the input and moves with any change in pressure (increase or decrease). By moving the diaphragm, pressure is applied to the shaft or piston, and they are also moved.
As the pressure rises to the maximum point, the diaphragm reaches the switch, and the contact is connected.
As the pressure drops, the shaft will be separated from the key, and the key will return to its original state.

Bardoni pressure switch

In general, the transfer of pressure from the fluid to the switch is carried out by Bredon. Bardon looks like a solvent metal tube shaped like a question mark with a different bow.
As the pressure increases, the bow is deformed and flattened, and the tip of the bow moves. When this displacement reaches the maximum set amount, it presses the switch and connects it, and when the pressure decreases, it disconnects from the switch and disconnects it. One of the advantages of this type of pressure switch is to withstand high pressure and temperature.

Piston pressure switch

The function of this pressure switch model is similar to the diaphragm pressure switch, and it works mechanically. Inside the pistons, two cylinders move one inside the other. A spring with constant resistance is used to return the piston to its original state. This spring can be adjusted (loosened and tightened) to adjust the required pressure for the operation of the pressure switch.

Pressure switch selection guide

The most crucial factor in choosing a pressure switch is knowing the need, performance, and work fluid in which the pressure switch is to be used. The application of pressure switches is in systems that work with pressure and the need to turn on and off the system in a specific range of pressure.
For gas working fluid, the accuracy is about millimeters, and the pressure switch must be explosion-proof and highly secure. But stainless steel is needed to control pressure and corrosion if the working fluid is water because it is humid and high-pressure.

In the pressure switch group of the reference site and store of Damatajhiz, see the information and prices of pressure switches from Honeywell, Dongs, Danfoss, ABB, etc., for review and selection.

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