![]() ![]() All of the pressure switches used on our air compressors include a pressure switch relief valve which relieves head and line pressure, allowing for easier starts. This simple mechanism completes the circuit and allows power to the motor as long as system pressure is below a specified setting. WHAT IT ISĪ pressure switch is a mechanical device that relies on air pressure to control the operation of an electric air compressor. Some pressure switches have a secondary spring (usually smaller than the primary spring) that will adjust the cut-out pressure without affecting the cut-in setting. The adjustment spring is used to increase and decrease the cut-in and cut-out pressure settings. When the pressure switch contacts separate, a lever actuates this valve to relieve pressure that was trapped between the pump and check valve. ![]() The pressure switch relief valve, which is located on the base of the pressure switch, is plumbed into the top of the check valve with a copper or nylon tube. The diaphragm is made of a flexible material that pushes against the block as air pressure increases. When the specified ‘cut-out’ pressure is reached, it forces the contacts apart and shuts down the motor. When separated, the circuit is broken and the motor will shut off. The contacts, which are made from a conductive material (90% silver, 10% nickel), are used to complete the electrical circuit and allow power to the motor. The terminals are the points where the incoming and outgoing power leads are connected to the pressure switch. It should always be turned to the ‘off’ position before plugging in or unplugging the air compressor. The lever (or knob, in a few cases) is used to manually separate the contacts. PRESSURE SWITCH COMPONENTSĬlick photo to enlarge. While pressure switches are used in a number of applications, the following post will focus specifically on how they are used in the assembly and operation of an electric air compressor. The following post will cover the primary components of a pressure switch, what it is, how it works and how to adjust one. It’s the electric counterpart to the piloted unloader valve which we discussed in a previous blog post. Go to my buying a compressor pressure switch page, for buying advice and to buy a pressure switch directly online.The pressure switch is an important component on many of our electric models. Keep in mind the points mentioned above under 'models and options'. When buying a (replacement) air pressure switch, it's important to buy one that will fit your air compressor. I have created a separate page, where I explain how a compressor pressure switch works. You know that a pressure switch 'senses' the air pressure in some way and switches the electrical contacts open and close, depending on the pressure and the settings. This is a Condor MDR 11, which is a very popular type of pressure switch. You can read about all the different types and models on our air pressure switch types and models page. Some pressure switches can switch a 3-phase motor directly, while other can only switch a small control current (for use with a central controller). ![]() Some have extra options integrated, like a blow-down valve, or have an option to add these kind of extra's.Īlso, there are big difference with regards to electrical and physical connections. Pressure switches come in a big variety of types and shapes. I have created a detailed explanation about the correct pressures, and how to set them on our air compressor pressure switch settings page. It will save you both money by saving on energy, and by saving on maintenance and repair costs. It's important to set the pressure switch at the correct cut-in and cut-out pressures. Typical air compressor pressure switch Pressure switch settings Often, there is a blow-down valve (pressure relieve valve) integrated, which will relieve the pressure on the compressors discharge pipe. With two set-screws you set the upper and lower pressure. The air compressor pressure switch on small and older compressor is a completely mechanical device. The pressure switch tells your compressor when to stop and when to start.īut in my experience, it is also a part that will break down quite often. The pressure switch is an important part on your air compressor. Perfect air pressure control with the right pressure switch, so your compressor starts and stops exactly when you want. ![]()
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