Cal Supply Company, Inc.

A pressure switch (also used for vacuum and called a vacuum switch) consists of a switch mechanism that is connected to a bellows or diaphragm that reacts to system pressure. Some are adjustable and some are not. They are selected operating range and differential. Operating range is the pressure limits in which the switch will work. Differential is the difference between the cut-in and cut-out pressures. A popular switch found on many compressors will a range of 40 to 250 PSI and an adjustable differentia of 35 to 60 PSI. This means that the lowest pressure that the switch can be set to close at is 40 PSI, and the highest pressure it can be set to open at is 250 PSI. The differential that is actually available to use varies with the pressure range you’re actually working in. As pressure increases, available differential increases as well. Some switches have differentials as low as 5 PSI. The contact points in the switch are usually rated for the amount of current they can carry. Some switches are also horsepower rated. When you replace a pressure switch it’s important to make sure the contacts are of the same configuration as the switch you have. Double Pole Single Throw (DPST) contacts are very common. These will have 4 terminal screws, two of which are labeled “Line” and two of which are labeled “Load” or “Motor”. Some pressure switches need to be able to signal whether they are open or closed. These commonly have contacts called Single Pole Double Throw (SPDT). There will be three terminals labeled “Common”, Normally Open” or “Normally Closed”. Cal Supply stocks a large selection of pressure switches for whatever you need.

A motor starter is a device that’s used to start an electric motor. It consists of a contactor and an overload relay. A contactor is a heavy duty magnetically actuated switch that connects the motor to the line. The overload relay senses the current drawn by the motor and opens a switch to shut the motor down if the current is excessive. The magnetic coil that closes the contactor is wired to the machine’s control circuit. Motor starters are seen most on motors 3 hp and larger, or smaller motors that need to be remotely controlled. Smaller compressor motors may have temperature switches built in to their windings to shut down the motor if it becomes overloaded. These motors are stopped and started directly by the pressure switch. Starting larger motors directly with the pressure switch is not a good idea. The pressure switch contact points are not capable of carrying the high starting current and will quickly burn out. Motor starters are sized by the current they have to carry. They are also rated by horsepower and voltage. Contact us for sizing assistance and a price quote.

Cal's gasoline and diesel engine driven compressors are known as highly reliable sources of compressed air for service and construction trucks. Compact packages ready to run Tank and base mounted versions available Electric starting on most models 8 to 30 HP Units available

There is such a wide variety of pumps designed for industrial use today that it’s difficult to list them all. Listed below are some of the more common types of pumps being used today and their specifications. However, what we would really like you to know is that Cal Supply is capable of supplying you with any type of industrial pump you may need. Not only can we supply you with a new pump but we can service your existing pumps in the field.

This type of lubricated rotary vane vacuum pump is intended for general industrial use where oil can be tolerated. Cal Supply's recirculated oil type pumps are regarded as highly reliable while requiring minimal maintenance. Flow Range: 7 - 903 CFM HP Range: 0.6 - 50 Torr: 0.5 In. Hg: 29.9

Transair offers a line of 304 Stainless Steel piping for use with liquids. The primary application of this piping is for industrial water with additives. It is offered in sizes of 22mm (34”), 28mm (1”), 42mm (1½”), 60mm (2¼)”, 76mm (3”) and 100mm (4”). This fully mechanical system allows for joints to be easily disassembled and re-used as needed, making maintenance and modification of industrial water systems much easier to perform. This system is rated for pressures up to 145 PSI and operating temperatures from –4°F to +185°F for the ¾ and 1” sizes and up to 140°F for the larger sizes. The ¾ and 1” sizes use push-to connect fittings. The larger sizes use different locking mechanisms. The Transair system makes using stainless steel easy and economical!